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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
607ca46e | 4 | #include <uapi/linux/sched.h> |
b7b3c76a | 5 | |
5c228079 DY |
6 | #include <linux/sched/prio.h> |
7 | ||
b7b3c76a DW |
8 | |
9 | struct sched_param { | |
10 | int sched_priority; | |
11 | }; | |
12 | ||
1da177e4 LT |
13 | #include <asm/param.h> /* for HZ */ |
14 | ||
1da177e4 LT |
15 | #include <linux/capability.h> |
16 | #include <linux/threads.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/timex.h> | |
20 | #include <linux/jiffies.h> | |
fb00aca4 | 21 | #include <linux/plist.h> |
1da177e4 LT |
22 | #include <linux/rbtree.h> |
23 | #include <linux/thread_info.h> | |
24 | #include <linux/cpumask.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/nodemask.h> | |
c92ff1bd | 27 | #include <linux/mm_types.h> |
92cf2118 | 28 | #include <linux/preempt.h> |
1da177e4 | 29 | |
1da177e4 LT |
30 | #include <asm/page.h> |
31 | #include <asm/ptrace.h> | |
bfc3f028 | 32 | #include <linux/cputime.h> |
1da177e4 LT |
33 | |
34 | #include <linux/smp.h> | |
35 | #include <linux/sem.h> | |
ab602f79 | 36 | #include <linux/shm.h> |
1da177e4 | 37 | #include <linux/signal.h> |
1da177e4 LT |
38 | #include <linux/compiler.h> |
39 | #include <linux/completion.h> | |
40 | #include <linux/pid.h> | |
41 | #include <linux/percpu.h> | |
42 | #include <linux/topology.h> | |
3e26c149 | 43 | #include <linux/proportions.h> |
1da177e4 | 44 | #include <linux/seccomp.h> |
e56d0903 | 45 | #include <linux/rcupdate.h> |
05725f7e | 46 | #include <linux/rculist.h> |
23f78d4a | 47 | #include <linux/rtmutex.h> |
1da177e4 | 48 | |
a3b6714e DW |
49 | #include <linux/time.h> |
50 | #include <linux/param.h> | |
51 | #include <linux/resource.h> | |
52 | #include <linux/timer.h> | |
53 | #include <linux/hrtimer.h> | |
7c3ab738 | 54 | #include <linux/task_io_accounting.h> |
9745512c | 55 | #include <linux/latencytop.h> |
9e2b2dc4 | 56 | #include <linux/cred.h> |
fa14ff4a | 57 | #include <linux/llist.h> |
7b44ab97 | 58 | #include <linux/uidgid.h> |
21caf2fc | 59 | #include <linux/gfp.h> |
d4311ff1 | 60 | #include <linux/magic.h> |
7d7efec3 | 61 | #include <linux/cgroup-defs.h> |
a3b6714e DW |
62 | |
63 | #include <asm/processor.h> | |
36d57ac4 | 64 | |
d50dde5a DF |
65 | #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */ |
66 | ||
67 | /* | |
68 | * Extended scheduling parameters data structure. | |
69 | * | |
70 | * This is needed because the original struct sched_param can not be | |
71 | * altered without introducing ABI issues with legacy applications | |
72 | * (e.g., in sched_getparam()). | |
73 | * | |
74 | * However, the possibility of specifying more than just a priority for | |
75 | * the tasks may be useful for a wide variety of application fields, e.g., | |
76 | * multimedia, streaming, automation and control, and many others. | |
77 | * | |
78 | * This variant (sched_attr) is meant at describing a so-called | |
79 | * sporadic time-constrained task. In such model a task is specified by: | |
80 | * - the activation period or minimum instance inter-arrival time; | |
81 | * - the maximum (or average, depending on the actual scheduling | |
82 | * discipline) computation time of all instances, a.k.a. runtime; | |
83 | * - the deadline (relative to the actual activation time) of each | |
84 | * instance. | |
85 | * Very briefly, a periodic (sporadic) task asks for the execution of | |
86 | * some specific computation --which is typically called an instance-- | |
87 | * (at most) every period. Moreover, each instance typically lasts no more | |
88 | * than the runtime and must be completed by time instant t equal to | |
89 | * the instance activation time + the deadline. | |
90 | * | |
91 | * This is reflected by the actual fields of the sched_attr structure: | |
92 | * | |
93 | * @size size of the structure, for fwd/bwd compat. | |
94 | * | |
95 | * @sched_policy task's scheduling policy | |
96 | * @sched_flags for customizing the scheduler behaviour | |
97 | * @sched_nice task's nice value (SCHED_NORMAL/BATCH) | |
98 | * @sched_priority task's static priority (SCHED_FIFO/RR) | |
99 | * @sched_deadline representative of the task's deadline | |
100 | * @sched_runtime representative of the task's runtime | |
101 | * @sched_period representative of the task's period | |
102 | * | |
103 | * Given this task model, there are a multiplicity of scheduling algorithms | |
104 | * and policies, that can be used to ensure all the tasks will make their | |
105 | * timing constraints. | |
aab03e05 DF |
106 | * |
107 | * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the | |
108 | * only user of this new interface. More information about the algorithm | |
109 | * available in the scheduling class file or in Documentation/. | |
d50dde5a DF |
110 | */ |
111 | struct sched_attr { | |
112 | u32 size; | |
113 | ||
114 | u32 sched_policy; | |
115 | u64 sched_flags; | |
116 | ||
117 | /* SCHED_NORMAL, SCHED_BATCH */ | |
118 | s32 sched_nice; | |
119 | ||
120 | /* SCHED_FIFO, SCHED_RR */ | |
121 | u32 sched_priority; | |
122 | ||
123 | /* SCHED_DEADLINE */ | |
124 | u64 sched_runtime; | |
125 | u64 sched_deadline; | |
126 | u64 sched_period; | |
127 | }; | |
128 | ||
c87e2837 | 129 | struct futex_pi_state; |
286100a6 | 130 | struct robust_list_head; |
bddd87c7 | 131 | struct bio_list; |
5ad4e53b | 132 | struct fs_struct; |
cdd6c482 | 133 | struct perf_event_context; |
73c10101 | 134 | struct blk_plug; |
c4ad8f98 | 135 | struct filename; |
89076bc3 | 136 | struct nameidata; |
1da177e4 | 137 | |
615d6e87 DB |
138 | #define VMACACHE_BITS 2 |
139 | #define VMACACHE_SIZE (1U << VMACACHE_BITS) | |
140 | #define VMACACHE_MASK (VMACACHE_SIZE - 1) | |
141 | ||
1da177e4 LT |
142 | /* |
143 | * These are the constant used to fake the fixed-point load-average | |
144 | * counting. Some notes: | |
145 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
146 | * a load-average precision of 10 bits integer + 11 bits fractional | |
147 | * - if you want to count load-averages more often, you need more | |
148 | * precision, or rounding will get you. With 2-second counting freq, | |
149 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
150 | * 11 bit fractions. | |
151 | */ | |
152 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 153 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
154 | |
155 | #define FSHIFT 11 /* nr of bits of precision */ | |
156 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 157 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
158 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
159 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
160 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
161 | ||
162 | #define CALC_LOAD(load,exp,n) \ | |
163 | load *= exp; \ | |
164 | load += n*(FIXED_1-exp); \ | |
165 | load >>= FSHIFT; | |
166 | ||
167 | extern unsigned long total_forks; | |
168 | extern int nr_threads; | |
1da177e4 LT |
169 | DECLARE_PER_CPU(unsigned long, process_counts); |
170 | extern int nr_processes(void); | |
171 | extern unsigned long nr_running(void); | |
2ee507c4 | 172 | extern bool single_task_running(void); |
1da177e4 | 173 | extern unsigned long nr_iowait(void); |
8c215bd3 | 174 | extern unsigned long nr_iowait_cpu(int cpu); |
372ba8cb | 175 | extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load); |
69d25870 | 176 | |
0f004f5a | 177 | extern void calc_global_load(unsigned long ticks); |
3289bdb4 PZ |
178 | |
179 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) | |
5aaa0b7a | 180 | extern void update_cpu_load_nohz(void); |
3289bdb4 PZ |
181 | #else |
182 | static inline void update_cpu_load_nohz(void) { } | |
183 | #endif | |
1da177e4 | 184 | |
7e49fcce SR |
185 | extern unsigned long get_parent_ip(unsigned long addr); |
186 | ||
b637a328 PM |
187 | extern void dump_cpu_task(int cpu); |
188 | ||
43ae34cb IM |
189 | struct seq_file; |
190 | struct cfs_rq; | |
4cf86d77 | 191 | struct task_group; |
43ae34cb IM |
192 | #ifdef CONFIG_SCHED_DEBUG |
193 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
194 | extern void proc_sched_set_task(struct task_struct *p); | |
43ae34cb | 195 | #endif |
1da177e4 | 196 | |
4a8342d2 LT |
197 | /* |
198 | * Task state bitmask. NOTE! These bits are also | |
199 | * encoded in fs/proc/array.c: get_task_state(). | |
200 | * | |
201 | * We have two separate sets of flags: task->state | |
202 | * is about runnability, while task->exit_state are | |
203 | * about the task exiting. Confusing, but this way | |
204 | * modifying one set can't modify the other one by | |
205 | * mistake. | |
206 | */ | |
1da177e4 LT |
207 | #define TASK_RUNNING 0 |
208 | #define TASK_INTERRUPTIBLE 1 | |
209 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
210 | #define __TASK_STOPPED 4 |
211 | #define __TASK_TRACED 8 | |
4a8342d2 | 212 | /* in tsk->exit_state */ |
ad86622b ON |
213 | #define EXIT_DEAD 16 |
214 | #define EXIT_ZOMBIE 32 | |
abd50b39 | 215 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
4a8342d2 | 216 | /* in tsk->state again */ |
af927232 | 217 | #define TASK_DEAD 64 |
f021a3c2 | 218 | #define TASK_WAKEKILL 128 |
e9c84311 | 219 | #define TASK_WAKING 256 |
f2530dc7 | 220 | #define TASK_PARKED 512 |
80ed87c8 PZ |
221 | #define TASK_NOLOAD 1024 |
222 | #define TASK_STATE_MAX 2048 | |
f021a3c2 | 223 | |
80ed87c8 | 224 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPN" |
73342151 | 225 | |
e1781538 PZ |
226 | extern char ___assert_task_state[1 - 2*!!( |
227 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
228 | |
229 | /* Convenience macros for the sake of set_task_state */ | |
230 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
231 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
232 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 233 | |
80ed87c8 PZ |
234 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) |
235 | ||
92a1f4bc MW |
236 | /* Convenience macros for the sake of wake_up */ |
237 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 238 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
239 | |
240 | /* get_task_state() */ | |
241 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 242 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 243 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 244 | |
f021a3c2 MW |
245 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
246 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 247 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 248 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 249 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 250 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
80ed87c8 PZ |
251 | (task->flags & PF_FROZEN) == 0 && \ |
252 | (task->state & TASK_NOLOAD) == 0) | |
1da177e4 | 253 | |
8eb23b9f PZ |
254 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
255 | ||
256 | #define __set_task_state(tsk, state_value) \ | |
257 | do { \ | |
258 | (tsk)->task_state_change = _THIS_IP_; \ | |
259 | (tsk)->state = (state_value); \ | |
260 | } while (0) | |
261 | #define set_task_state(tsk, state_value) \ | |
262 | do { \ | |
263 | (tsk)->task_state_change = _THIS_IP_; \ | |
b92b8b35 | 264 | smp_store_mb((tsk)->state, (state_value)); \ |
8eb23b9f PZ |
265 | } while (0) |
266 | ||
267 | /* | |
268 | * set_current_state() includes a barrier so that the write of current->state | |
269 | * is correctly serialised wrt the caller's subsequent test of whether to | |
270 | * actually sleep: | |
271 | * | |
272 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
273 | * if (do_i_need_to_sleep()) | |
274 | * schedule(); | |
275 | * | |
276 | * If the caller does not need such serialisation then use __set_current_state() | |
277 | */ | |
278 | #define __set_current_state(state_value) \ | |
279 | do { \ | |
280 | current->task_state_change = _THIS_IP_; \ | |
281 | current->state = (state_value); \ | |
282 | } while (0) | |
283 | #define set_current_state(state_value) \ | |
284 | do { \ | |
285 | current->task_state_change = _THIS_IP_; \ | |
b92b8b35 | 286 | smp_store_mb(current->state, (state_value)); \ |
8eb23b9f PZ |
287 | } while (0) |
288 | ||
289 | #else | |
290 | ||
1da177e4 LT |
291 | #define __set_task_state(tsk, state_value) \ |
292 | do { (tsk)->state = (state_value); } while (0) | |
293 | #define set_task_state(tsk, state_value) \ | |
b92b8b35 | 294 | smp_store_mb((tsk)->state, (state_value)) |
1da177e4 | 295 | |
498d0c57 AM |
296 | /* |
297 | * set_current_state() includes a barrier so that the write of current->state | |
298 | * is correctly serialised wrt the caller's subsequent test of whether to | |
299 | * actually sleep: | |
300 | * | |
301 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
302 | * if (do_i_need_to_sleep()) | |
303 | * schedule(); | |
304 | * | |
305 | * If the caller does not need such serialisation then use __set_current_state() | |
306 | */ | |
8eb23b9f | 307 | #define __set_current_state(state_value) \ |
1da177e4 | 308 | do { current->state = (state_value); } while (0) |
8eb23b9f | 309 | #define set_current_state(state_value) \ |
b92b8b35 | 310 | smp_store_mb(current->state, (state_value)) |
1da177e4 | 311 | |
8eb23b9f PZ |
312 | #endif |
313 | ||
1da177e4 LT |
314 | /* Task command name length */ |
315 | #define TASK_COMM_LEN 16 | |
316 | ||
1da177e4 LT |
317 | #include <linux/spinlock.h> |
318 | ||
319 | /* | |
320 | * This serializes "schedule()" and also protects | |
321 | * the run-queue from deletions/modifications (but | |
322 | * _adding_ to the beginning of the run-queue has | |
323 | * a separate lock). | |
324 | */ | |
325 | extern rwlock_t tasklist_lock; | |
326 | extern spinlock_t mmlist_lock; | |
327 | ||
36c8b586 | 328 | struct task_struct; |
1da177e4 | 329 | |
db1466b3 PM |
330 | #ifdef CONFIG_PROVE_RCU |
331 | extern int lockdep_tasklist_lock_is_held(void); | |
332 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
333 | ||
1da177e4 LT |
334 | extern void sched_init(void); |
335 | extern void sched_init_smp(void); | |
2d07b255 | 336 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 337 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 338 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 339 | |
3fa0818b RR |
340 | extern cpumask_var_t cpu_isolated_map; |
341 | ||
89f19f04 | 342 | extern int runqueue_is_locked(int cpu); |
017730c1 | 343 | |
3451d024 | 344 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 345 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 346 | extern void set_cpu_sd_state_idle(void); |
bc7a34b8 | 347 | extern int get_nohz_timer_target(void); |
46cb4b7c | 348 | #else |
c1cc017c | 349 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 350 | static inline void set_cpu_sd_state_idle(void) { } |
46cb4b7c | 351 | #endif |
1da177e4 | 352 | |
e59e2ae2 | 353 | /* |
39bc89fd | 354 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
355 | */ |
356 | extern void show_state_filter(unsigned long state_filter); | |
357 | ||
358 | static inline void show_state(void) | |
359 | { | |
39bc89fd | 360 | show_state_filter(0); |
e59e2ae2 IM |
361 | } |
362 | ||
1da177e4 LT |
363 | extern void show_regs(struct pt_regs *); |
364 | ||
365 | /* | |
366 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
367 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
368 | * trace (or NULL if the entire call-chain of the task should be shown). | |
369 | */ | |
370 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
371 | ||
1da177e4 LT |
372 | extern void cpu_init (void); |
373 | extern void trap_init(void); | |
374 | extern void update_process_times(int user); | |
375 | extern void scheduler_tick(void); | |
376 | ||
82a1fcb9 IM |
377 | extern void sched_show_task(struct task_struct *p); |
378 | ||
19cc36c0 | 379 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 380 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 381 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 382 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
383 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
384 | void __user *buffer, | |
385 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 386 | extern unsigned int softlockup_panic; |
ac1f5912 | 387 | extern unsigned int hardlockup_panic; |
004417a6 | 388 | void lockup_detector_init(void); |
8446f1d3 | 389 | #else |
8446f1d3 IM |
390 | static inline void touch_softlockup_watchdog(void) |
391 | { | |
392 | } | |
d6ad3e28 JW |
393 | static inline void touch_softlockup_watchdog_sync(void) |
394 | { | |
395 | } | |
04c9167f JF |
396 | static inline void touch_all_softlockup_watchdogs(void) |
397 | { | |
398 | } | |
004417a6 PZ |
399 | static inline void lockup_detector_init(void) |
400 | { | |
401 | } | |
8446f1d3 IM |
402 | #endif |
403 | ||
8b414521 MT |
404 | #ifdef CONFIG_DETECT_HUNG_TASK |
405 | void reset_hung_task_detector(void); | |
406 | #else | |
407 | static inline void reset_hung_task_detector(void) | |
408 | { | |
409 | } | |
410 | #endif | |
411 | ||
1da177e4 LT |
412 | /* Attach to any functions which should be ignored in wchan output. */ |
413 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
414 | |
415 | /* Linker adds these: start and end of __sched functions */ | |
416 | extern char __sched_text_start[], __sched_text_end[]; | |
417 | ||
1da177e4 LT |
418 | /* Is this address in the __sched functions? */ |
419 | extern int in_sched_functions(unsigned long addr); | |
420 | ||
421 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 422 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 423 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 424 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 425 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 426 | asmlinkage void schedule(void); |
c5491ea7 | 427 | extern void schedule_preempt_disabled(void); |
1da177e4 | 428 | |
9cff8ade N |
429 | extern long io_schedule_timeout(long timeout); |
430 | ||
431 | static inline void io_schedule(void) | |
432 | { | |
433 | io_schedule_timeout(MAX_SCHEDULE_TIMEOUT); | |
434 | } | |
435 | ||
ab516013 | 436 | struct nsproxy; |
acce292c | 437 | struct user_namespace; |
1da177e4 | 438 | |
efc1a3b1 DH |
439 | #ifdef CONFIG_MMU |
440 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
441 | extern unsigned long |
442 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
443 | unsigned long, unsigned long); | |
444 | extern unsigned long | |
445 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
446 | unsigned long len, unsigned long pgoff, | |
447 | unsigned long flags); | |
efc1a3b1 DH |
448 | #else |
449 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
450 | #endif | |
1da177e4 | 451 | |
d049f74f KC |
452 | #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ |
453 | #define SUID_DUMP_USER 1 /* Dump as user of process */ | |
454 | #define SUID_DUMP_ROOT 2 /* Dump as root */ | |
455 | ||
6c5d5238 | 456 | /* mm flags */ |
f8af4da3 | 457 | |
7288e118 | 458 | /* for SUID_DUMP_* above */ |
3cb4a0bb | 459 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 460 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb | 461 | |
942be387 ON |
462 | extern void set_dumpable(struct mm_struct *mm, int value); |
463 | /* | |
464 | * This returns the actual value of the suid_dumpable flag. For things | |
465 | * that are using this for checking for privilege transitions, it must | |
466 | * test against SUID_DUMP_USER rather than treating it as a boolean | |
467 | * value. | |
468 | */ | |
469 | static inline int __get_dumpable(unsigned long mm_flags) | |
470 | { | |
471 | return mm_flags & MMF_DUMPABLE_MASK; | |
472 | } | |
473 | ||
474 | static inline int get_dumpable(struct mm_struct *mm) | |
475 | { | |
476 | return __get_dumpable(mm->flags); | |
477 | } | |
478 | ||
3cb4a0bb KH |
479 | /* coredump filter bits */ |
480 | #define MMF_DUMP_ANON_PRIVATE 2 | |
481 | #define MMF_DUMP_ANON_SHARED 3 | |
482 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
483 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 484 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
485 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
486 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 487 | |
3cb4a0bb | 488 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 489 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
490 | #define MMF_DUMP_FILTER_MASK \ |
491 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
492 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 493 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
494 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
495 | ||
496 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
497 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
498 | #else | |
499 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
500 | #endif | |
f8af4da3 HD |
501 | /* leave room for more dump flags */ |
502 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 503 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 504 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 505 | |
9f68f672 ON |
506 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
507 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 508 | |
f8af4da3 | 509 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 510 | |
1da177e4 LT |
511 | struct sighand_struct { |
512 | atomic_t count; | |
513 | struct k_sigaction action[_NSIG]; | |
514 | spinlock_t siglock; | |
b8fceee1 | 515 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
516 | }; |
517 | ||
0e464814 | 518 | struct pacct_struct { |
f6ec29a4 KK |
519 | int ac_flag; |
520 | long ac_exitcode; | |
0e464814 | 521 | unsigned long ac_mem; |
77787bfb KK |
522 | cputime_t ac_utime, ac_stime; |
523 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
524 | }; |
525 | ||
42c4ab41 SG |
526 | struct cpu_itimer { |
527 | cputime_t expires; | |
528 | cputime_t incr; | |
8356b5f9 SG |
529 | u32 error; |
530 | u32 incr_error; | |
42c4ab41 SG |
531 | }; |
532 | ||
d37f761d | 533 | /** |
9d7fb042 | 534 | * struct prev_cputime - snaphsot of system and user cputime |
d37f761d FW |
535 | * @utime: time spent in user mode |
536 | * @stime: time spent in system mode | |
9d7fb042 | 537 | * @lock: protects the above two fields |
d37f761d | 538 | * |
9d7fb042 PZ |
539 | * Stores previous user/system time values such that we can guarantee |
540 | * monotonicity. | |
d37f761d | 541 | */ |
9d7fb042 PZ |
542 | struct prev_cputime { |
543 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
d37f761d FW |
544 | cputime_t utime; |
545 | cputime_t stime; | |
9d7fb042 PZ |
546 | raw_spinlock_t lock; |
547 | #endif | |
d37f761d FW |
548 | }; |
549 | ||
9d7fb042 PZ |
550 | static inline void prev_cputime_init(struct prev_cputime *prev) |
551 | { | |
552 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
553 | prev->utime = prev->stime = 0; | |
554 | raw_spin_lock_init(&prev->lock); | |
555 | #endif | |
556 | } | |
557 | ||
f06febc9 FM |
558 | /** |
559 | * struct task_cputime - collected CPU time counts | |
560 | * @utime: time spent in user mode, in &cputime_t units | |
561 | * @stime: time spent in kernel mode, in &cputime_t units | |
562 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 563 | * |
9d7fb042 PZ |
564 | * This structure groups together three kinds of CPU time that are tracked for |
565 | * threads and thread groups. Most things considering CPU time want to group | |
566 | * these counts together and treat all three of them in parallel. | |
f06febc9 FM |
567 | */ |
568 | struct task_cputime { | |
569 | cputime_t utime; | |
570 | cputime_t stime; | |
571 | unsigned long long sum_exec_runtime; | |
572 | }; | |
9d7fb042 | 573 | |
f06febc9 | 574 | /* Alternate field names when used to cache expirations. */ |
f06febc9 | 575 | #define virt_exp utime |
9d7fb042 | 576 | #define prof_exp stime |
f06febc9 FM |
577 | #define sched_exp sum_exec_runtime |
578 | ||
4cd4c1b4 PZ |
579 | #define INIT_CPUTIME \ |
580 | (struct task_cputime) { \ | |
64861634 MS |
581 | .utime = 0, \ |
582 | .stime = 0, \ | |
4cd4c1b4 PZ |
583 | .sum_exec_runtime = 0, \ |
584 | } | |
585 | ||
971e8a98 JL |
586 | /* |
587 | * This is the atomic variant of task_cputime, which can be used for | |
588 | * storing and updating task_cputime statistics without locking. | |
589 | */ | |
590 | struct task_cputime_atomic { | |
591 | atomic64_t utime; | |
592 | atomic64_t stime; | |
593 | atomic64_t sum_exec_runtime; | |
594 | }; | |
595 | ||
596 | #define INIT_CPUTIME_ATOMIC \ | |
597 | (struct task_cputime_atomic) { \ | |
598 | .utime = ATOMIC64_INIT(0), \ | |
599 | .stime = ATOMIC64_INIT(0), \ | |
600 | .sum_exec_runtime = ATOMIC64_INIT(0), \ | |
601 | } | |
602 | ||
609ca066 | 603 | #define PREEMPT_DISABLED (PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED) |
a233f112 | 604 | |
c99e6efe | 605 | /* |
87dcbc06 PZ |
606 | * Disable preemption until the scheduler is running -- use an unconditional |
607 | * value so that it also works on !PREEMPT_COUNT kernels. | |
d86ee480 | 608 | * |
87dcbc06 | 609 | * Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count(). |
c99e6efe | 610 | */ |
87dcbc06 | 611 | #define INIT_PREEMPT_COUNT PREEMPT_OFFSET |
a233f112 | 612 | |
c99e6efe | 613 | /* |
609ca066 PZ |
614 | * Initial preempt_count value; reflects the preempt_count schedule invariant |
615 | * which states that during context switches: | |
d86ee480 | 616 | * |
609ca066 PZ |
617 | * preempt_count() == 2*PREEMPT_DISABLE_OFFSET |
618 | * | |
619 | * Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels. | |
620 | * Note: See finish_task_switch(). | |
c99e6efe | 621 | */ |
609ca066 | 622 | #define FORK_PREEMPT_COUNT (2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED) |
c99e6efe | 623 | |
f06febc9 | 624 | /** |
4cd4c1b4 | 625 | * struct thread_group_cputimer - thread group interval timer counts |
920ce39f | 626 | * @cputime_atomic: atomic thread group interval timers. |
d5c373eb JL |
627 | * @running: true when there are timers running and |
628 | * @cputime_atomic receives updates. | |
c8d75aa4 JL |
629 | * @checking_timer: true when a thread in the group is in the |
630 | * process of checking for thread group timers. | |
f06febc9 FM |
631 | * |
632 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 633 | * used for thread group CPU timer calculations. |
f06febc9 | 634 | */ |
4cd4c1b4 | 635 | struct thread_group_cputimer { |
71107445 | 636 | struct task_cputime_atomic cputime_atomic; |
d5c373eb | 637 | bool running; |
c8d75aa4 | 638 | bool checking_timer; |
f06febc9 | 639 | }; |
f06febc9 | 640 | |
4714d1d3 | 641 | #include <linux/rwsem.h> |
5091faa4 MG |
642 | struct autogroup; |
643 | ||
1da177e4 | 644 | /* |
e815f0a8 | 645 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
646 | * locking, because a shared signal_struct always |
647 | * implies a shared sighand_struct, so locking | |
648 | * sighand_struct is always a proper superset of | |
649 | * the locking of signal_struct. | |
650 | */ | |
651 | struct signal_struct { | |
ea6d290c | 652 | atomic_t sigcnt; |
1da177e4 | 653 | atomic_t live; |
b3ac022c | 654 | int nr_threads; |
0c740d0a | 655 | struct list_head thread_head; |
1da177e4 LT |
656 | |
657 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
658 | ||
659 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 660 | struct task_struct *curr_target; |
1da177e4 LT |
661 | |
662 | /* shared signal handling: */ | |
663 | struct sigpending shared_pending; | |
664 | ||
665 | /* thread group exit support */ | |
666 | int group_exit_code; | |
667 | /* overloaded: | |
668 | * - notify group_exit_task when ->count is equal to notify_count | |
669 | * - everyone except group_exit_task is stopped during signal delivery | |
670 | * of fatal signals, group_exit_task processes the signal. | |
671 | */ | |
1da177e4 | 672 | int notify_count; |
07dd20e0 | 673 | struct task_struct *group_exit_task; |
1da177e4 LT |
674 | |
675 | /* thread group stop support, overloads group_exit_code too */ | |
676 | int group_stop_count; | |
677 | unsigned int flags; /* see SIGNAL_* flags below */ | |
678 | ||
ebec18a6 LP |
679 | /* |
680 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
681 | * manager, to re-parent orphan (double-forking) child processes | |
682 | * to this process instead of 'init'. The service manager is | |
683 | * able to receive SIGCHLD signals and is able to investigate | |
684 | * the process until it calls wait(). All children of this | |
685 | * process will inherit a flag if they should look for a | |
686 | * child_subreaper process at exit. | |
687 | */ | |
688 | unsigned int is_child_subreaper:1; | |
689 | unsigned int has_child_subreaper:1; | |
690 | ||
1da177e4 | 691 | /* POSIX.1b Interval Timers */ |
5ed67f05 PE |
692 | int posix_timer_id; |
693 | struct list_head posix_timers; | |
1da177e4 LT |
694 | |
695 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 696 | struct hrtimer real_timer; |
fea9d175 | 697 | struct pid *leader_pid; |
2ff678b8 | 698 | ktime_t it_real_incr; |
1da177e4 | 699 | |
42c4ab41 SG |
700 | /* |
701 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
702 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
703 | * values are defined to 0 and 1 respectively | |
704 | */ | |
705 | struct cpu_itimer it[2]; | |
1da177e4 | 706 | |
f06febc9 | 707 | /* |
4cd4c1b4 PZ |
708 | * Thread group totals for process CPU timers. |
709 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 710 | */ |
4cd4c1b4 | 711 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
712 | |
713 | /* Earliest-expiration cache. */ | |
714 | struct task_cputime cputime_expires; | |
715 | ||
716 | struct list_head cpu_timers[3]; | |
717 | ||
ab521dc0 | 718 | struct pid *tty_old_pgrp; |
1ec320af | 719 | |
1da177e4 LT |
720 | /* boolean value for session group leader */ |
721 | int leader; | |
722 | ||
723 | struct tty_struct *tty; /* NULL if no tty */ | |
724 | ||
5091faa4 MG |
725 | #ifdef CONFIG_SCHED_AUTOGROUP |
726 | struct autogroup *autogroup; | |
727 | #endif | |
1da177e4 LT |
728 | /* |
729 | * Cumulative resource counters for dead threads in the group, | |
730 | * and for reaped dead child processes forked by this group. | |
731 | * Live threads maintain their own counters and add to these | |
732 | * in __exit_signal, except for the group leader. | |
733 | */ | |
e78c3496 | 734 | seqlock_t stats_lock; |
32bd671d | 735 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
736 | cputime_t gtime; |
737 | cputime_t cgtime; | |
9d7fb042 | 738 | struct prev_cputime prev_cputime; |
1da177e4 LT |
739 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
740 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 741 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 742 | unsigned long maxrss, cmaxrss; |
940389b8 | 743 | struct task_io_accounting ioac; |
1da177e4 | 744 | |
32bd671d PZ |
745 | /* |
746 | * Cumulative ns of schedule CPU time fo dead threads in the | |
747 | * group, not including a zombie group leader, (This only differs | |
748 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
749 | * other than jiffies.) | |
750 | */ | |
751 | unsigned long long sum_sched_runtime; | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * We don't bother to synchronize most readers of this at all, | |
755 | * because there is no reader checking a limit that actually needs | |
756 | * to get both rlim_cur and rlim_max atomically, and either one | |
757 | * alone is a single word that can safely be read normally. | |
758 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
759 | * protect this instead of the siglock, because they really | |
760 | * have no need to disable irqs. | |
761 | */ | |
762 | struct rlimit rlim[RLIM_NLIMITS]; | |
763 | ||
0e464814 KK |
764 | #ifdef CONFIG_BSD_PROCESS_ACCT |
765 | struct pacct_struct pacct; /* per-process accounting information */ | |
766 | #endif | |
ad4ecbcb | 767 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
768 | struct taskstats *stats; |
769 | #endif | |
522ed776 MT |
770 | #ifdef CONFIG_AUDIT |
771 | unsigned audit_tty; | |
46e959ea | 772 | unsigned audit_tty_log_passwd; |
522ed776 MT |
773 | struct tty_audit_buf *tty_audit_buf; |
774 | #endif | |
0c986253 TH |
775 | #ifdef CONFIG_CGROUPS |
776 | /* | |
777 | * group_rwsem prevents new tasks from entering the threadgroup and | |
778 | * member tasks from exiting,a more specifically, setting of | |
779 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
780 | * using threadgroup_change_begin/end(). Users which require | |
781 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
782 | * which also takes care of exec path. Currently, cgroup is the | |
783 | * only user. | |
784 | */ | |
785 | struct rw_semaphore group_rwsem; | |
786 | #endif | |
28b83c51 | 787 | |
e1e12d2f | 788 | oom_flags_t oom_flags; |
a9c58b90 DR |
789 | short oom_score_adj; /* OOM kill score adjustment */ |
790 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
791 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
792 | |
793 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
794 | * credential calculations | |
795 | * (notably. ptrace) */ | |
1da177e4 LT |
796 | }; |
797 | ||
798 | /* | |
799 | * Bits in flags field of signal_struct. | |
800 | */ | |
801 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
802 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
803 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
403bad72 | 804 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ |
e4420551 ON |
805 | /* |
806 | * Pending notifications to parent. | |
807 | */ | |
808 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
809 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
810 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 811 | |
fae5fa44 ON |
812 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
813 | ||
ed5d2cac ON |
814 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
815 | static inline int signal_group_exit(const struct signal_struct *sig) | |
816 | { | |
817 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
818 | (sig->group_exit_task != NULL); | |
819 | } | |
820 | ||
1da177e4 LT |
821 | /* |
822 | * Some day this will be a full-fledged user tracking system.. | |
823 | */ | |
824 | struct user_struct { | |
825 | atomic_t __count; /* reference count */ | |
826 | atomic_t processes; /* How many processes does this user have? */ | |
1da177e4 | 827 | atomic_t sigpending; /* How many pending signals does this user have? */ |
2d9048e2 | 828 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
829 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
830 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
831 | #endif | |
4afeff85 EP |
832 | #ifdef CONFIG_FANOTIFY |
833 | atomic_t fanotify_listeners; | |
834 | #endif | |
7ef9964e | 835 | #ifdef CONFIG_EPOLL |
52bd19f7 | 836 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 837 | #endif |
970a8645 | 838 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
839 | /* protected by mq_lock */ |
840 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 841 | #endif |
1da177e4 LT |
842 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
843 | ||
844 | #ifdef CONFIG_KEYS | |
845 | struct key *uid_keyring; /* UID specific keyring */ | |
846 | struct key *session_keyring; /* UID's default session keyring */ | |
847 | #endif | |
848 | ||
849 | /* Hash table maintenance information */ | |
735de223 | 850 | struct hlist_node uidhash_node; |
7b44ab97 | 851 | kuid_t uid; |
24e377a8 | 852 | |
aaac3ba9 | 853 | #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) |
789f90fc PZ |
854 | atomic_long_t locked_vm; |
855 | #endif | |
1da177e4 LT |
856 | }; |
857 | ||
eb41d946 | 858 | extern int uids_sysfs_init(void); |
5cb350ba | 859 | |
7b44ab97 | 860 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
861 | |
862 | extern struct user_struct root_user; | |
863 | #define INIT_USER (&root_user) | |
864 | ||
b6dff3ec | 865 | |
1da177e4 LT |
866 | struct backing_dev_info; |
867 | struct reclaim_state; | |
868 | ||
f6db8347 | 869 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
870 | struct sched_info { |
871 | /* cumulative counters */ | |
2d72376b | 872 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 873 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
874 | |
875 | /* timestamps */ | |
172ba844 BS |
876 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
877 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 878 | }; |
f6db8347 | 879 | #endif /* CONFIG_SCHED_INFO */ |
1da177e4 | 880 | |
ca74e92b SN |
881 | #ifdef CONFIG_TASK_DELAY_ACCT |
882 | struct task_delay_info { | |
883 | spinlock_t lock; | |
884 | unsigned int flags; /* Private per-task flags */ | |
885 | ||
886 | /* For each stat XXX, add following, aligned appropriately | |
887 | * | |
888 | * struct timespec XXX_start, XXX_end; | |
889 | * u64 XXX_delay; | |
890 | * u32 XXX_count; | |
891 | * | |
892 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
893 | * single lock above (split into XXX_lock if contention is an issue). | |
894 | */ | |
0ff92245 SN |
895 | |
896 | /* | |
897 | * XXX_count is incremented on every XXX operation, the delay | |
898 | * associated with the operation is added to XXX_delay. | |
899 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
900 | */ | |
9667a23d | 901 | u64 blkio_start; /* Shared by blkio, swapin */ |
0ff92245 SN |
902 | u64 blkio_delay; /* wait for sync block io completion */ |
903 | u64 swapin_delay; /* wait for swapin block io completion */ | |
904 | u32 blkio_count; /* total count of the number of sync block */ | |
905 | /* io operations performed */ | |
906 | u32 swapin_count; /* total count of the number of swapin block */ | |
907 | /* io operations performed */ | |
873b4771 | 908 | |
9667a23d | 909 | u64 freepages_start; |
873b4771 KK |
910 | u64 freepages_delay; /* wait for memory reclaim */ |
911 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 912 | }; |
52f17b6c CS |
913 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
914 | ||
915 | static inline int sched_info_on(void) | |
916 | { | |
917 | #ifdef CONFIG_SCHEDSTATS | |
918 | return 1; | |
919 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
920 | extern int delayacct_on; | |
921 | return delayacct_on; | |
922 | #else | |
923 | return 0; | |
ca74e92b | 924 | #endif |
52f17b6c | 925 | } |
ca74e92b | 926 | |
d15bcfdb IM |
927 | enum cpu_idle_type { |
928 | CPU_IDLE, | |
929 | CPU_NOT_IDLE, | |
930 | CPU_NEWLY_IDLE, | |
931 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
932 | }; |
933 | ||
1399fa78 | 934 | /* |
ca8ce3d0 | 935 | * Increase resolution of cpu_capacity calculations |
1399fa78 | 936 | */ |
ca8ce3d0 NP |
937 | #define SCHED_CAPACITY_SHIFT 10 |
938 | #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
1da177e4 | 939 | |
76751049 PZ |
940 | /* |
941 | * Wake-queues are lists of tasks with a pending wakeup, whose | |
942 | * callers have already marked the task as woken internally, | |
943 | * and can thus carry on. A common use case is being able to | |
944 | * do the wakeups once the corresponding user lock as been | |
945 | * released. | |
946 | * | |
947 | * We hold reference to each task in the list across the wakeup, | |
948 | * thus guaranteeing that the memory is still valid by the time | |
949 | * the actual wakeups are performed in wake_up_q(). | |
950 | * | |
951 | * One per task suffices, because there's never a need for a task to be | |
952 | * in two wake queues simultaneously; it is forbidden to abandon a task | |
953 | * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is | |
954 | * already in a wake queue, the wakeup will happen soon and the second | |
955 | * waker can just skip it. | |
956 | * | |
957 | * The WAKE_Q macro declares and initializes the list head. | |
958 | * wake_up_q() does NOT reinitialize the list; it's expected to be | |
959 | * called near the end of a function, where the fact that the queue is | |
960 | * not used again will be easy to see by inspection. | |
961 | * | |
962 | * Note that this can cause spurious wakeups. schedule() callers | |
963 | * must ensure the call is done inside a loop, confirming that the | |
964 | * wakeup condition has in fact occurred. | |
965 | */ | |
966 | struct wake_q_node { | |
967 | struct wake_q_node *next; | |
968 | }; | |
969 | ||
970 | struct wake_q_head { | |
971 | struct wake_q_node *first; | |
972 | struct wake_q_node **lastp; | |
973 | }; | |
974 | ||
975 | #define WAKE_Q_TAIL ((struct wake_q_node *) 0x01) | |
976 | ||
977 | #define WAKE_Q(name) \ | |
978 | struct wake_q_head name = { WAKE_Q_TAIL, &name.first } | |
979 | ||
980 | extern void wake_q_add(struct wake_q_head *head, | |
981 | struct task_struct *task); | |
982 | extern void wake_up_q(struct wake_q_head *head); | |
983 | ||
1399fa78 NR |
984 | /* |
985 | * sched-domains (multiprocessor balancing) declarations: | |
986 | */ | |
2dd73a4f | 987 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
988 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
989 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
990 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
991 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 992 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 993 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
5d4dfddd | 994 | #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */ |
d77b3ed5 | 995 | #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ |
b5d978e0 PZ |
996 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
997 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 998 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 999 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 1000 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
3a7053b3 | 1001 | #define SD_NUMA 0x4000 /* cross-node balancing */ |
5c45bf27 | 1002 | |
143e1e28 | 1003 | #ifdef CONFIG_SCHED_SMT |
b6220ad6 | 1004 | static inline int cpu_smt_flags(void) |
143e1e28 | 1005 | { |
5d4dfddd | 1006 | return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; |
143e1e28 VG |
1007 | } |
1008 | #endif | |
1009 | ||
1010 | #ifdef CONFIG_SCHED_MC | |
b6220ad6 | 1011 | static inline int cpu_core_flags(void) |
143e1e28 VG |
1012 | { |
1013 | return SD_SHARE_PKG_RESOURCES; | |
1014 | } | |
1015 | #endif | |
1016 | ||
1017 | #ifdef CONFIG_NUMA | |
b6220ad6 | 1018 | static inline int cpu_numa_flags(void) |
143e1e28 VG |
1019 | { |
1020 | return SD_NUMA; | |
1021 | } | |
1022 | #endif | |
532cb4c4 | 1023 | |
1d3504fc HS |
1024 | struct sched_domain_attr { |
1025 | int relax_domain_level; | |
1026 | }; | |
1027 | ||
1028 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
1029 | .relax_domain_level = -1, \ | |
1030 | } | |
1031 | ||
60495e77 PZ |
1032 | extern int sched_domain_level_max; |
1033 | ||
5e6521ea LZ |
1034 | struct sched_group; |
1035 | ||
1da177e4 LT |
1036 | struct sched_domain { |
1037 | /* These fields must be setup */ | |
1038 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 1039 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 1040 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
1041 | unsigned long min_interval; /* Minimum balance interval ms */ |
1042 | unsigned long max_interval; /* Maximum balance interval ms */ | |
1043 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
1044 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 1045 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
1046 | unsigned int busy_idx; |
1047 | unsigned int idle_idx; | |
1048 | unsigned int newidle_idx; | |
1049 | unsigned int wake_idx; | |
147cbb4b | 1050 | unsigned int forkexec_idx; |
a52bfd73 | 1051 | unsigned int smt_gain; |
25f55d9d VG |
1052 | |
1053 | int nohz_idle; /* NOHZ IDLE status */ | |
1da177e4 | 1054 | int flags; /* See SD_* */ |
60495e77 | 1055 | int level; |
1da177e4 LT |
1056 | |
1057 | /* Runtime fields. */ | |
1058 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
1059 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
1060 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
1061 | ||
f48627e6 | 1062 | /* idle_balance() stats */ |
9bd721c5 | 1063 | u64 max_newidle_lb_cost; |
f48627e6 | 1064 | unsigned long next_decay_max_lb_cost; |
2398f2c6 | 1065 | |
1da177e4 LT |
1066 | #ifdef CONFIG_SCHEDSTATS |
1067 | /* load_balance() stats */ | |
480b9434 KC |
1068 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
1069 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
1070 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
1071 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
1072 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
1073 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
1074 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
1075 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
1076 | |
1077 | /* Active load balancing */ | |
480b9434 KC |
1078 | unsigned int alb_count; |
1079 | unsigned int alb_failed; | |
1080 | unsigned int alb_pushed; | |
1da177e4 | 1081 | |
68767a0a | 1082 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
1083 | unsigned int sbe_count; |
1084 | unsigned int sbe_balanced; | |
1085 | unsigned int sbe_pushed; | |
1da177e4 | 1086 | |
68767a0a | 1087 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
1088 | unsigned int sbf_count; |
1089 | unsigned int sbf_balanced; | |
1090 | unsigned int sbf_pushed; | |
68767a0a | 1091 | |
1da177e4 | 1092 | /* try_to_wake_up() stats */ |
480b9434 KC |
1093 | unsigned int ttwu_wake_remote; |
1094 | unsigned int ttwu_move_affine; | |
1095 | unsigned int ttwu_move_balance; | |
1da177e4 | 1096 | #endif |
a5d8c348 IM |
1097 | #ifdef CONFIG_SCHED_DEBUG |
1098 | char *name; | |
1099 | #endif | |
dce840a0 PZ |
1100 | union { |
1101 | void *private; /* used during construction */ | |
1102 | struct rcu_head rcu; /* used during destruction */ | |
1103 | }; | |
6c99e9ad | 1104 | |
669c55e9 | 1105 | unsigned int span_weight; |
4200efd9 IM |
1106 | /* |
1107 | * Span of all CPUs in this domain. | |
1108 | * | |
1109 | * NOTE: this field is variable length. (Allocated dynamically | |
1110 | * by attaching extra space to the end of the structure, | |
1111 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
1112 | */ |
1113 | unsigned long span[0]; | |
1da177e4 LT |
1114 | }; |
1115 | ||
758b2cdc RR |
1116 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
1117 | { | |
6c99e9ad | 1118 | return to_cpumask(sd->span); |
758b2cdc RR |
1119 | } |
1120 | ||
acc3f5d7 | 1121 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 1122 | struct sched_domain_attr *dattr_new); |
029190c5 | 1123 | |
acc3f5d7 RR |
1124 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
1125 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1126 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1127 | ||
39be3501 PZ |
1128 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1129 | ||
143e1e28 | 1130 | typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); |
b6220ad6 | 1131 | typedef int (*sched_domain_flags_f)(void); |
143e1e28 VG |
1132 | |
1133 | #define SDTL_OVERLAP 0x01 | |
1134 | ||
1135 | struct sd_data { | |
1136 | struct sched_domain **__percpu sd; | |
1137 | struct sched_group **__percpu sg; | |
63b2ca30 | 1138 | struct sched_group_capacity **__percpu sgc; |
143e1e28 VG |
1139 | }; |
1140 | ||
1141 | struct sched_domain_topology_level { | |
1142 | sched_domain_mask_f mask; | |
1143 | sched_domain_flags_f sd_flags; | |
1144 | int flags; | |
1145 | int numa_level; | |
1146 | struct sd_data data; | |
1147 | #ifdef CONFIG_SCHED_DEBUG | |
1148 | char *name; | |
1149 | #endif | |
1150 | }; | |
1151 | ||
143e1e28 | 1152 | extern void set_sched_topology(struct sched_domain_topology_level *tl); |
f6be8af1 | 1153 | extern void wake_up_if_idle(int cpu); |
143e1e28 VG |
1154 | |
1155 | #ifdef CONFIG_SCHED_DEBUG | |
1156 | # define SD_INIT_NAME(type) .name = #type | |
1157 | #else | |
1158 | # define SD_INIT_NAME(type) | |
1159 | #endif | |
1160 | ||
1b427c15 | 1161 | #else /* CONFIG_SMP */ |
1da177e4 | 1162 | |
1b427c15 | 1163 | struct sched_domain_attr; |
d02c7a8c | 1164 | |
1b427c15 | 1165 | static inline void |
acc3f5d7 | 1166 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1167 | struct sched_domain_attr *dattr_new) |
1168 | { | |
d02c7a8c | 1169 | } |
39be3501 PZ |
1170 | |
1171 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1172 | { | |
1173 | return true; | |
1174 | } | |
1175 | ||
1b427c15 | 1176 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1177 | |
47fe38fc | 1178 | |
1da177e4 | 1179 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1180 | |
1da177e4 | 1181 | |
383f2835 | 1182 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1183 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
1184 | #else |
1185 | static inline void prefetch_stack(struct task_struct *t) { } | |
1186 | #endif | |
1da177e4 LT |
1187 | |
1188 | struct audit_context; /* See audit.c */ | |
1189 | struct mempolicy; | |
b92ce558 | 1190 | struct pipe_inode_info; |
4865ecf1 | 1191 | struct uts_namespace; |
1da177e4 | 1192 | |
20b8a59f | 1193 | struct load_weight { |
9dbdb155 PZ |
1194 | unsigned long weight; |
1195 | u32 inv_weight; | |
20b8a59f IM |
1196 | }; |
1197 | ||
9d89c257 YD |
1198 | /* |
1199 | * The load_avg/util_avg accumulates an infinite geometric series. | |
e0f5f3af DE |
1200 | * 1) load_avg factors frequency scaling into the amount of time that a |
1201 | * sched_entity is runnable on a rq into its weight. For cfs_rq, it is the | |
1202 | * aggregated such weights of all runnable and blocked sched_entities. | |
e3279a2e | 1203 | * 2) util_avg factors frequency and cpu scaling into the amount of time |
9d89c257 YD |
1204 | * that a sched_entity is running on a CPU, in the range [0..SCHED_LOAD_SCALE]. |
1205 | * For cfs_rq, it is the aggregated such times of all runnable and | |
1206 | * blocked sched_entities. | |
1207 | * The 64 bit load_sum can: | |
1208 | * 1) for cfs_rq, afford 4353082796 (=2^64/47742/88761) entities with | |
1209 | * the highest weight (=88761) always runnable, we should not overflow | |
1210 | * 2) for entity, support any load.weight always runnable | |
1211 | */ | |
9d85f21c | 1212 | struct sched_avg { |
9d89c257 YD |
1213 | u64 last_update_time, load_sum; |
1214 | u32 util_sum, period_contrib; | |
1215 | unsigned long load_avg, util_avg; | |
9d85f21c PT |
1216 | }; |
1217 | ||
94c18227 | 1218 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1219 | struct sched_statistics { |
20b8a59f | 1220 | u64 wait_start; |
94c18227 | 1221 | u64 wait_max; |
6d082592 AV |
1222 | u64 wait_count; |
1223 | u64 wait_sum; | |
8f0dfc34 AV |
1224 | u64 iowait_count; |
1225 | u64 iowait_sum; | |
94c18227 | 1226 | |
20b8a59f | 1227 | u64 sleep_start; |
20b8a59f | 1228 | u64 sleep_max; |
94c18227 IM |
1229 | s64 sum_sleep_runtime; |
1230 | ||
1231 | u64 block_start; | |
20b8a59f IM |
1232 | u64 block_max; |
1233 | u64 exec_max; | |
eba1ed4b | 1234 | u64 slice_max; |
cc367732 | 1235 | |
cc367732 IM |
1236 | u64 nr_migrations_cold; |
1237 | u64 nr_failed_migrations_affine; | |
1238 | u64 nr_failed_migrations_running; | |
1239 | u64 nr_failed_migrations_hot; | |
1240 | u64 nr_forced_migrations; | |
cc367732 IM |
1241 | |
1242 | u64 nr_wakeups; | |
1243 | u64 nr_wakeups_sync; | |
1244 | u64 nr_wakeups_migrate; | |
1245 | u64 nr_wakeups_local; | |
1246 | u64 nr_wakeups_remote; | |
1247 | u64 nr_wakeups_affine; | |
1248 | u64 nr_wakeups_affine_attempts; | |
1249 | u64 nr_wakeups_passive; | |
1250 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1251 | }; |
1252 | #endif | |
1253 | ||
1254 | struct sched_entity { | |
1255 | struct load_weight load; /* for load-balancing */ | |
1256 | struct rb_node run_node; | |
1257 | struct list_head group_node; | |
1258 | unsigned int on_rq; | |
1259 | ||
1260 | u64 exec_start; | |
1261 | u64 sum_exec_runtime; | |
1262 | u64 vruntime; | |
1263 | u64 prev_sum_exec_runtime; | |
1264 | ||
41acab88 LDM |
1265 | u64 nr_migrations; |
1266 | ||
41acab88 LDM |
1267 | #ifdef CONFIG_SCHEDSTATS |
1268 | struct sched_statistics statistics; | |
94c18227 IM |
1269 | #endif |
1270 | ||
20b8a59f | 1271 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 1272 | int depth; |
20b8a59f IM |
1273 | struct sched_entity *parent; |
1274 | /* rq on which this entity is (to be) queued: */ | |
1275 | struct cfs_rq *cfs_rq; | |
1276 | /* rq "owned" by this entity/group: */ | |
1277 | struct cfs_rq *my_q; | |
1278 | #endif | |
8bd75c77 | 1279 | |
141965c7 | 1280 | #ifdef CONFIG_SMP |
9d89c257 | 1281 | /* Per entity load average tracking */ |
9d85f21c PT |
1282 | struct sched_avg avg; |
1283 | #endif | |
20b8a59f | 1284 | }; |
70b97a7f | 1285 | |
fa717060 PZ |
1286 | struct sched_rt_entity { |
1287 | struct list_head run_list; | |
78f2c7db | 1288 | unsigned long timeout; |
57d2aa00 | 1289 | unsigned long watchdog_stamp; |
bee367ed | 1290 | unsigned int time_slice; |
6f505b16 | 1291 | |
58d6c2d7 | 1292 | struct sched_rt_entity *back; |
052f1dc7 | 1293 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1294 | struct sched_rt_entity *parent; |
1295 | /* rq on which this entity is (to be) queued: */ | |
1296 | struct rt_rq *rt_rq; | |
1297 | /* rq "owned" by this entity/group: */ | |
1298 | struct rt_rq *my_q; | |
1299 | #endif | |
fa717060 PZ |
1300 | }; |
1301 | ||
aab03e05 DF |
1302 | struct sched_dl_entity { |
1303 | struct rb_node rb_node; | |
1304 | ||
1305 | /* | |
1306 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 1307 | * during sched_setattr(), they will remain the same until |
1308 | * the next sched_setattr(). | |
aab03e05 DF |
1309 | */ |
1310 | u64 dl_runtime; /* maximum runtime for each instance */ | |
1311 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 1312 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 1313 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
1314 | |
1315 | /* | |
1316 | * Actual scheduling parameters. Initialized with the values above, | |
1317 | * they are continously updated during task execution. Note that | |
1318 | * the remaining runtime could be < 0 in case we are in overrun. | |
1319 | */ | |
1320 | s64 runtime; /* remaining runtime for this instance */ | |
1321 | u64 deadline; /* absolute deadline for this instance */ | |
1322 | unsigned int flags; /* specifying the scheduler behaviour */ | |
1323 | ||
1324 | /* | |
1325 | * Some bool flags: | |
1326 | * | |
1327 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
1328 | * task has to wait for a replenishment to be performed at the | |
1329 | * next firing of dl_timer. | |
1330 | * | |
1331 | * @dl_new tells if a new instance arrived. If so we must | |
1332 | * start executing it with full runtime and reset its absolute | |
1333 | * deadline; | |
2d3d891d DF |
1334 | * |
1335 | * @dl_boosted tells if we are boosted due to DI. If so we are | |
1336 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
1337 | * exit the critical section); |
1338 | * | |
1339 | * @dl_yielded tells if task gave up the cpu before consuming | |
1340 | * all its available runtime during the last job. | |
aab03e05 | 1341 | */ |
5bfd126e | 1342 | int dl_throttled, dl_new, dl_boosted, dl_yielded; |
aab03e05 DF |
1343 | |
1344 | /* | |
1345 | * Bandwidth enforcement timer. Each -deadline task has its | |
1346 | * own bandwidth to be enforced, thus we need one timer per task. | |
1347 | */ | |
1348 | struct hrtimer dl_timer; | |
1349 | }; | |
8bd75c77 | 1350 | |
1d082fd0 PM |
1351 | union rcu_special { |
1352 | struct { | |
8203d6d0 PM |
1353 | u8 blocked; |
1354 | u8 need_qs; | |
1355 | u8 exp_need_qs; | |
1356 | u8 pad; /* Otherwise the compiler can store garbage here. */ | |
1357 | } b; /* Bits. */ | |
1358 | u32 s; /* Set of bits. */ | |
1d082fd0 | 1359 | }; |
86848966 PM |
1360 | struct rcu_node; |
1361 | ||
8dc85d54 PZ |
1362 | enum perf_event_task_context { |
1363 | perf_invalid_context = -1, | |
1364 | perf_hw_context = 0, | |
89a1e187 | 1365 | perf_sw_context, |
8dc85d54 PZ |
1366 | perf_nr_task_contexts, |
1367 | }; | |
1368 | ||
72b252ae MG |
1369 | /* Track pages that require TLB flushes */ |
1370 | struct tlbflush_unmap_batch { | |
1371 | /* | |
1372 | * Each bit set is a CPU that potentially has a TLB entry for one of | |
1373 | * the PFNs being flushed. See set_tlb_ubc_flush_pending(). | |
1374 | */ | |
1375 | struct cpumask cpumask; | |
1376 | ||
1377 | /* True if any bit in cpumask is set */ | |
1378 | bool flush_required; | |
d950c947 MG |
1379 | |
1380 | /* | |
1381 | * If true then the PTE was dirty when unmapped. The entry must be | |
1382 | * flushed before IO is initiated or a stale TLB entry potentially | |
1383 | * allows an update without redirtying the page. | |
1384 | */ | |
1385 | bool writable; | |
72b252ae MG |
1386 | }; |
1387 | ||
1da177e4 LT |
1388 | struct task_struct { |
1389 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1390 | void *stack; |
1da177e4 | 1391 | atomic_t usage; |
97dc32cd WC |
1392 | unsigned int flags; /* per process flags, defined below */ |
1393 | unsigned int ptrace; | |
1da177e4 | 1394 | |
2dd73a4f | 1395 | #ifdef CONFIG_SMP |
fa14ff4a | 1396 | struct llist_node wake_entry; |
3ca7a440 | 1397 | int on_cpu; |
63b0e9ed | 1398 | unsigned int wakee_flips; |
62470419 | 1399 | unsigned long wakee_flip_decay_ts; |
63b0e9ed | 1400 | struct task_struct *last_wakee; |
ac66f547 PZ |
1401 | |
1402 | int wake_cpu; | |
2dd73a4f | 1403 | #endif |
fd2f4419 | 1404 | int on_rq; |
50e645a8 | 1405 | |
b29739f9 | 1406 | int prio, static_prio, normal_prio; |
c7aceaba | 1407 | unsigned int rt_priority; |
5522d5d5 | 1408 | const struct sched_class *sched_class; |
20b8a59f | 1409 | struct sched_entity se; |
fa717060 | 1410 | struct sched_rt_entity rt; |
8323f26c PZ |
1411 | #ifdef CONFIG_CGROUP_SCHED |
1412 | struct task_group *sched_task_group; | |
1413 | #endif | |
aab03e05 | 1414 | struct sched_dl_entity dl; |
1da177e4 | 1415 | |
e107be36 AK |
1416 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1417 | /* list of struct preempt_notifier: */ | |
1418 | struct hlist_head preempt_notifiers; | |
1419 | #endif | |
1420 | ||
6c5c9341 | 1421 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1422 | unsigned int btrace_seq; |
6c5c9341 | 1423 | #endif |
1da177e4 | 1424 | |
97dc32cd | 1425 | unsigned int policy; |
29baa747 | 1426 | int nr_cpus_allowed; |
1da177e4 | 1427 | cpumask_t cpus_allowed; |
1da177e4 | 1428 | |
a57eb940 | 1429 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1430 | int rcu_read_lock_nesting; |
1d082fd0 | 1431 | union rcu_special rcu_read_unlock_special; |
f41d911f | 1432 | struct list_head rcu_node_entry; |
a57eb940 | 1433 | struct rcu_node *rcu_blocked_node; |
28f6569a | 1434 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
8315f422 PM |
1435 | #ifdef CONFIG_TASKS_RCU |
1436 | unsigned long rcu_tasks_nvcsw; | |
1437 | bool rcu_tasks_holdout; | |
1438 | struct list_head rcu_tasks_holdout_list; | |
176f8f7a | 1439 | int rcu_tasks_idle_cpu; |
8315f422 | 1440 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 1441 | |
f6db8347 | 1442 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
1443 | struct sched_info sched_info; |
1444 | #endif | |
1445 | ||
1446 | struct list_head tasks; | |
806c09a7 | 1447 | #ifdef CONFIG_SMP |
917b627d | 1448 | struct plist_node pushable_tasks; |
1baca4ce | 1449 | struct rb_node pushable_dl_tasks; |
806c09a7 | 1450 | #endif |
1da177e4 LT |
1451 | |
1452 | struct mm_struct *mm, *active_mm; | |
615d6e87 DB |
1453 | /* per-thread vma caching */ |
1454 | u32 vmacache_seqnum; | |
1455 | struct vm_area_struct *vmacache[VMACACHE_SIZE]; | |
34e55232 KH |
1456 | #if defined(SPLIT_RSS_COUNTING) |
1457 | struct task_rss_stat rss_stat; | |
1458 | #endif | |
1da177e4 | 1459 | /* task state */ |
97dc32cd | 1460 | int exit_state; |
1da177e4 LT |
1461 | int exit_code, exit_signal; |
1462 | int pdeath_signal; /* The signal sent when the parent dies */ | |
e7cc4173 | 1463 | unsigned long jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
1464 | |
1465 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 1466 | unsigned int personality; |
9b89f6ba | 1467 | |
f9ce1f1c KT |
1468 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1469 | * execve */ | |
8f0dfc34 AV |
1470 | unsigned in_iowait:1; |
1471 | ||
ca94c442 LP |
1472 | /* Revert to default priority/policy when forking */ |
1473 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1474 | unsigned sched_contributes_to_load:1; |
ff303e66 | 1475 | unsigned sched_migrated:1; |
626ebc41 TH |
1476 | #ifdef CONFIG_MEMCG |
1477 | unsigned memcg_may_oom:1; | |
1478 | #endif | |
6f185c29 VD |
1479 | #ifdef CONFIG_MEMCG_KMEM |
1480 | unsigned memcg_kmem_skip_account:1; | |
1481 | #endif | |
ff303e66 PZ |
1482 | #ifdef CONFIG_COMPAT_BRK |
1483 | unsigned brk_randomized:1; | |
1484 | #endif | |
6f185c29 | 1485 | |
1d4457f9 KC |
1486 | unsigned long atomic_flags; /* Flags needing atomic access. */ |
1487 | ||
f56141e3 AL |
1488 | struct restart_block restart_block; |
1489 | ||
1da177e4 LT |
1490 | pid_t pid; |
1491 | pid_t tgid; | |
0a425405 | 1492 | |
1314562a | 1493 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1494 | /* Canary value for the -fstack-protector gcc feature */ |
1495 | unsigned long stack_canary; | |
1314562a | 1496 | #endif |
4d1d61a6 | 1497 | /* |
1da177e4 | 1498 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1499 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1500 | * p->real_parent->pid) |
1da177e4 | 1501 | */ |
abd63bc3 KC |
1502 | struct task_struct __rcu *real_parent; /* real parent process */ |
1503 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1504 | /* |
f470021a | 1505 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1506 | */ |
1507 | struct list_head children; /* list of my children */ | |
1508 | struct list_head sibling; /* linkage in my parent's children list */ | |
1509 | struct task_struct *group_leader; /* threadgroup leader */ | |
1510 | ||
f470021a RM |
1511 | /* |
1512 | * ptraced is the list of tasks this task is using ptrace on. | |
1513 | * This includes both natural children and PTRACE_ATTACH targets. | |
1514 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1515 | */ | |
1516 | struct list_head ptraced; | |
1517 | struct list_head ptrace_entry; | |
1518 | ||
1da177e4 | 1519 | /* PID/PID hash table linkage. */ |
92476d7f | 1520 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1521 | struct list_head thread_group; |
0c740d0a | 1522 | struct list_head thread_node; |
1da177e4 LT |
1523 | |
1524 | struct completion *vfork_done; /* for vfork() */ | |
1525 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1526 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1527 | ||
c66f08be | 1528 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1529 | cputime_t gtime; |
9d7fb042 | 1530 | struct prev_cputime prev_cputime; |
6a61671b FW |
1531 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1532 | seqlock_t vtime_seqlock; | |
1533 | unsigned long long vtime_snap; | |
1534 | enum { | |
1535 | VTIME_SLEEPING = 0, | |
1536 | VTIME_USER, | |
1537 | VTIME_SYS, | |
1538 | } vtime_snap_whence; | |
d99ca3b9 | 1539 | #endif |
1da177e4 | 1540 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
ccbf62d8 | 1541 | u64 start_time; /* monotonic time in nsec */ |
57e0be04 | 1542 | u64 real_start_time; /* boot based time in nsec */ |
1da177e4 LT |
1543 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1544 | unsigned long min_flt, maj_flt; | |
1545 | ||
f06febc9 | 1546 | struct task_cputime cputime_expires; |
1da177e4 LT |
1547 | struct list_head cpu_timers[3]; |
1548 | ||
1549 | /* process credentials */ | |
1b0ba1c9 | 1550 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1551 | * credentials (COW) */ |
1b0ba1c9 | 1552 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1553 | * credentials (COW) */ |
36772092 PBG |
1554 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1555 | - access with [gs]et_task_comm (which lock | |
1556 | it with task_lock()) | |
221af7f8 | 1557 | - initialized normally by setup_new_exec */ |
1da177e4 | 1558 | /* file system info */ |
756daf26 | 1559 | struct nameidata *nameidata; |
3d5b6fcc | 1560 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1561 | /* ipc stuff */ |
1562 | struct sysv_sem sysvsem; | |
ab602f79 | 1563 | struct sysv_shm sysvshm; |
3d5b6fcc | 1564 | #endif |
e162b39a | 1565 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1566 | /* hung task detection */ |
82a1fcb9 IM |
1567 | unsigned long last_switch_count; |
1568 | #endif | |
1da177e4 LT |
1569 | /* filesystem information */ |
1570 | struct fs_struct *fs; | |
1571 | /* open file information */ | |
1572 | struct files_struct *files; | |
1651e14e | 1573 | /* namespaces */ |
ab516013 | 1574 | struct nsproxy *nsproxy; |
1da177e4 LT |
1575 | /* signal handlers */ |
1576 | struct signal_struct *signal; | |
1577 | struct sighand_struct *sighand; | |
1578 | ||
1579 | sigset_t blocked, real_blocked; | |
f3de272b | 1580 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1581 | struct sigpending pending; |
1582 | ||
1583 | unsigned long sas_ss_sp; | |
1584 | size_t sas_ss_size; | |
1585 | int (*notifier)(void *priv); | |
1586 | void *notifier_data; | |
1587 | sigset_t *notifier_mask; | |
67d12145 | 1588 | struct callback_head *task_works; |
e73f8959 | 1589 | |
1da177e4 | 1590 | struct audit_context *audit_context; |
bfef93a5 | 1591 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1592 | kuid_t loginuid; |
4746ec5b | 1593 | unsigned int sessionid; |
bfef93a5 | 1594 | #endif |
932ecebb | 1595 | struct seccomp seccomp; |
1da177e4 LT |
1596 | |
1597 | /* Thread group tracking */ | |
1598 | u32 parent_exec_id; | |
1599 | u32 self_exec_id; | |
58568d2a MX |
1600 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1601 | * mempolicy */ | |
1da177e4 | 1602 | spinlock_t alloc_lock; |
1da177e4 | 1603 | |
b29739f9 | 1604 | /* Protection of the PI data structures: */ |
1d615482 | 1605 | raw_spinlock_t pi_lock; |
b29739f9 | 1606 | |
76751049 PZ |
1607 | struct wake_q_node wake_q; |
1608 | ||
23f78d4a IM |
1609 | #ifdef CONFIG_RT_MUTEXES |
1610 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
1611 | struct rb_root pi_waiters; |
1612 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
1613 | /* Deadlock detection and priority inheritance handling */ |
1614 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1615 | #endif |
1616 | ||
408894ee IM |
1617 | #ifdef CONFIG_DEBUG_MUTEXES |
1618 | /* mutex deadlock detection */ | |
1619 | struct mutex_waiter *blocked_on; | |
1620 | #endif | |
de30a2b3 IM |
1621 | #ifdef CONFIG_TRACE_IRQFLAGS |
1622 | unsigned int irq_events; | |
de30a2b3 | 1623 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1624 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1625 | unsigned int hardirq_enable_event; |
de30a2b3 | 1626 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1627 | int hardirqs_enabled; |
1628 | int hardirq_context; | |
de30a2b3 | 1629 | unsigned long softirq_disable_ip; |
de30a2b3 | 1630 | unsigned long softirq_enable_ip; |
fa1452e8 | 1631 | unsigned int softirq_disable_event; |
de30a2b3 | 1632 | unsigned int softirq_enable_event; |
fa1452e8 | 1633 | int softirqs_enabled; |
de30a2b3 IM |
1634 | int softirq_context; |
1635 | #endif | |
fbb9ce95 | 1636 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1637 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1638 | u64 curr_chain_key; |
1639 | int lockdep_depth; | |
fbb9ce95 | 1640 | unsigned int lockdep_recursion; |
c7aceaba | 1641 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1642 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1643 | #endif |
408894ee | 1644 | |
1da177e4 LT |
1645 | /* journalling filesystem info */ |
1646 | void *journal_info; | |
1647 | ||
d89d8796 | 1648 | /* stacked block device info */ |
bddd87c7 | 1649 | struct bio_list *bio_list; |
d89d8796 | 1650 | |
73c10101 JA |
1651 | #ifdef CONFIG_BLOCK |
1652 | /* stack plugging */ | |
1653 | struct blk_plug *plug; | |
1654 | #endif | |
1655 | ||
1da177e4 LT |
1656 | /* VM state */ |
1657 | struct reclaim_state *reclaim_state; | |
1658 | ||
1da177e4 LT |
1659 | struct backing_dev_info *backing_dev_info; |
1660 | ||
1661 | struct io_context *io_context; | |
1662 | ||
1663 | unsigned long ptrace_message; | |
1664 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1665 | struct task_io_accounting ioac; |
8f0ab514 | 1666 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1667 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1668 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1669 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1670 | #endif |
1671 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1672 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1673 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1674 | int cpuset_mem_spread_rotor; |
6adef3eb | 1675 | int cpuset_slab_spread_rotor; |
1da177e4 | 1676 | #endif |
ddbcc7e8 | 1677 | #ifdef CONFIG_CGROUPS |
817929ec | 1678 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1679 | struct css_set __rcu *cgroups; |
817929ec PM |
1680 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1681 | struct list_head cg_list; | |
ddbcc7e8 | 1682 | #endif |
42b2dd0a | 1683 | #ifdef CONFIG_FUTEX |
0771dfef | 1684 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1685 | #ifdef CONFIG_COMPAT |
1686 | struct compat_robust_list_head __user *compat_robust_list; | |
1687 | #endif | |
c87e2837 IM |
1688 | struct list_head pi_state_list; |
1689 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1690 | #endif |
cdd6c482 | 1691 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1692 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1693 | struct mutex perf_event_mutex; |
1694 | struct list_head perf_event_list; | |
a63eaf34 | 1695 | #endif |
8f47b187 TG |
1696 | #ifdef CONFIG_DEBUG_PREEMPT |
1697 | unsigned long preempt_disable_ip; | |
1698 | #endif | |
c7aceaba | 1699 | #ifdef CONFIG_NUMA |
58568d2a | 1700 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1701 | short il_next; |
207205a2 | 1702 | short pref_node_fork; |
42b2dd0a | 1703 | #endif |
cbee9f88 PZ |
1704 | #ifdef CONFIG_NUMA_BALANCING |
1705 | int numa_scan_seq; | |
cbee9f88 | 1706 | unsigned int numa_scan_period; |
598f0ec0 | 1707 | unsigned int numa_scan_period_max; |
de1c9ce6 | 1708 | int numa_preferred_nid; |
6b9a7460 | 1709 | unsigned long numa_migrate_retry; |
cbee9f88 | 1710 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
1711 | u64 last_task_numa_placement; |
1712 | u64 last_sum_exec_runtime; | |
cbee9f88 | 1713 | struct callback_head numa_work; |
f809ca9a | 1714 | |
8c8a743c PZ |
1715 | struct list_head numa_entry; |
1716 | struct numa_group *numa_group; | |
1717 | ||
745d6147 | 1718 | /* |
44dba3d5 IM |
1719 | * numa_faults is an array split into four regions: |
1720 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1721 | * in this precise order. | |
1722 | * | |
1723 | * faults_memory: Exponential decaying average of faults on a per-node | |
1724 | * basis. Scheduling placement decisions are made based on these | |
1725 | * counts. The values remain static for the duration of a PTE scan. | |
1726 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1727 | * hinting fault was incurred. | |
1728 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1729 | * during the current scan window. When the scan completes, the counts | |
1730 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1731 | */ |
44dba3d5 | 1732 | unsigned long *numa_faults; |
83e1d2cd | 1733 | unsigned long total_numa_faults; |
745d6147 | 1734 | |
04bb2f94 RR |
1735 | /* |
1736 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1737 | * scan window were remote/local or failed to migrate. The task scan |
1738 | * period is adapted based on the locality of the faults with different | |
1739 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1740 | */ |
074c2381 | 1741 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1742 | |
b32e86b4 | 1743 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1744 | #endif /* CONFIG_NUMA_BALANCING */ |
1745 | ||
72b252ae MG |
1746 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
1747 | struct tlbflush_unmap_batch tlb_ubc; | |
1748 | #endif | |
1749 | ||
e56d0903 | 1750 | struct rcu_head rcu; |
b92ce558 JA |
1751 | |
1752 | /* | |
1753 | * cache last used pipe for splice | |
1754 | */ | |
1755 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1756 | |
1757 | struct page_frag task_frag; | |
1758 | ||
ca74e92b SN |
1759 | #ifdef CONFIG_TASK_DELAY_ACCT |
1760 | struct task_delay_info *delays; | |
f4f154fd AM |
1761 | #endif |
1762 | #ifdef CONFIG_FAULT_INJECTION | |
1763 | int make_it_fail; | |
ca74e92b | 1764 | #endif |
9d823e8f WF |
1765 | /* |
1766 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1767 | * balance_dirty_pages() for some dirty throttling pause | |
1768 | */ | |
1769 | int nr_dirtied; | |
1770 | int nr_dirtied_pause; | |
83712358 | 1771 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1772 | |
9745512c AV |
1773 | #ifdef CONFIG_LATENCYTOP |
1774 | int latency_record_count; | |
1775 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1776 | #endif | |
6976675d AV |
1777 | /* |
1778 | * time slack values; these are used to round up poll() and | |
1779 | * select() etc timeout values. These are in nanoseconds. | |
1780 | */ | |
1781 | unsigned long timer_slack_ns; | |
1782 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1783 | |
0b24becc AR |
1784 | #ifdef CONFIG_KASAN |
1785 | unsigned int kasan_depth; | |
1786 | #endif | |
fb52607a | 1787 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1788 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1789 | int curr_ret_stack; |
1790 | /* Stack of return addresses for return function tracing */ | |
1791 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1792 | /* time stamp for last schedule */ |
1793 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1794 | /* |
1795 | * Number of functions that haven't been traced | |
1796 | * because of depth overrun. | |
1797 | */ | |
1798 | atomic_t trace_overrun; | |
380c4b14 FW |
1799 | /* Pause for the tracing */ |
1800 | atomic_t tracing_graph_pause; | |
f201ae23 | 1801 | #endif |
ea4e2bc4 SR |
1802 | #ifdef CONFIG_TRACING |
1803 | /* state flags for use by tracers */ | |
1804 | unsigned long trace; | |
b1cff0ad | 1805 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1806 | unsigned long trace_recursion; |
1807 | #endif /* CONFIG_TRACING */ | |
6f185c29 | 1808 | #ifdef CONFIG_MEMCG |
626ebc41 TH |
1809 | struct mem_cgroup *memcg_in_oom; |
1810 | gfp_t memcg_oom_gfp_mask; | |
1811 | int memcg_oom_order; | |
569b846d | 1812 | #endif |
0326f5a9 SD |
1813 | #ifdef CONFIG_UPROBES |
1814 | struct uprobe_task *utask; | |
0326f5a9 | 1815 | #endif |
cafe5635 KO |
1816 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1817 | unsigned int sequential_io; | |
1818 | unsigned int sequential_io_avg; | |
1819 | #endif | |
8eb23b9f PZ |
1820 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1821 | unsigned long task_state_change; | |
1822 | #endif | |
8bcbde54 | 1823 | int pagefault_disabled; |
0c8c0f03 DH |
1824 | /* CPU-specific state of this task */ |
1825 | struct thread_struct thread; | |
1826 | /* | |
1827 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1828 | * structure. It *MUST* be at the end of 'task_struct'. | |
1829 | * | |
1830 | * Do not put anything below here! | |
1831 | */ | |
1da177e4 LT |
1832 | }; |
1833 | ||
5aaeb5c0 IM |
1834 | #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT |
1835 | extern int arch_task_struct_size __read_mostly; | |
1836 | #else | |
1837 | # define arch_task_struct_size (sizeof(struct task_struct)) | |
1838 | #endif | |
0c8c0f03 | 1839 | |
76e6eee0 | 1840 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1841 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1842 | |
6688cc05 PZ |
1843 | #define TNF_MIGRATED 0x01 |
1844 | #define TNF_NO_GROUP 0x02 | |
dabe1d99 | 1845 | #define TNF_SHARED 0x04 |
04bb2f94 | 1846 | #define TNF_FAULT_LOCAL 0x08 |
074c2381 | 1847 | #define TNF_MIGRATE_FAIL 0x10 |
6688cc05 | 1848 | |
cbee9f88 | 1849 | #ifdef CONFIG_NUMA_BALANCING |
6688cc05 | 1850 | extern void task_numa_fault(int last_node, int node, int pages, int flags); |
e29cf08b | 1851 | extern pid_t task_numa_group_id(struct task_struct *p); |
1a687c2e | 1852 | extern void set_numabalancing_state(bool enabled); |
82727018 | 1853 | extern void task_numa_free(struct task_struct *p); |
10f39042 RR |
1854 | extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page, |
1855 | int src_nid, int dst_cpu); | |
cbee9f88 | 1856 | #else |
ac8e895b | 1857 | static inline void task_numa_fault(int last_node, int node, int pages, |
6688cc05 | 1858 | int flags) |
cbee9f88 PZ |
1859 | { |
1860 | } | |
e29cf08b MG |
1861 | static inline pid_t task_numa_group_id(struct task_struct *p) |
1862 | { | |
1863 | return 0; | |
1864 | } | |
1a687c2e MG |
1865 | static inline void set_numabalancing_state(bool enabled) |
1866 | { | |
1867 | } | |
82727018 RR |
1868 | static inline void task_numa_free(struct task_struct *p) |
1869 | { | |
1870 | } | |
10f39042 RR |
1871 | static inline bool should_numa_migrate_memory(struct task_struct *p, |
1872 | struct page *page, int src_nid, int dst_cpu) | |
1873 | { | |
1874 | return true; | |
1875 | } | |
cbee9f88 PZ |
1876 | #endif |
1877 | ||
e868171a | 1878 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1879 | { |
1880 | return task->pids[PIDTYPE_PID].pid; | |
1881 | } | |
1882 | ||
e868171a | 1883 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1884 | { |
1885 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1886 | } | |
1887 | ||
6dda81f4 ON |
1888 | /* |
1889 | * Without tasklist or rcu lock it is not safe to dereference | |
1890 | * the result of task_pgrp/task_session even if task == current, | |
1891 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1892 | */ | |
e868171a | 1893 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1894 | { |
1895 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1896 | } | |
1897 | ||
e868171a | 1898 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1899 | { |
1900 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1901 | } | |
1902 | ||
7af57294 PE |
1903 | struct pid_namespace; |
1904 | ||
1905 | /* | |
1906 | * the helpers to get the task's different pids as they are seen | |
1907 | * from various namespaces | |
1908 | * | |
1909 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1910 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1911 | * current. | |
7af57294 PE |
1912 | * task_xid_nr_ns() : id seen from the ns specified; |
1913 | * | |
1914 | * set_task_vxid() : assigns a virtual id to a task; | |
1915 | * | |
7af57294 PE |
1916 | * see also pid_nr() etc in include/linux/pid.h |
1917 | */ | |
52ee2dfd ON |
1918 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1919 | struct pid_namespace *ns); | |
7af57294 | 1920 | |
e868171a | 1921 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1922 | { |
1923 | return tsk->pid; | |
1924 | } | |
1925 | ||
52ee2dfd ON |
1926 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1927 | struct pid_namespace *ns) | |
1928 | { | |
1929 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1930 | } | |
7af57294 PE |
1931 | |
1932 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1933 | { | |
52ee2dfd | 1934 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1935 | } |
1936 | ||
1937 | ||
e868171a | 1938 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1939 | { |
1940 | return tsk->tgid; | |
1941 | } | |
1942 | ||
2f2a3a46 | 1943 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1944 | |
1945 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1946 | { | |
1947 | return pid_vnr(task_tgid(tsk)); | |
1948 | } | |
1949 | ||
1950 | ||
80e0b6e8 | 1951 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1952 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1953 | { | |
1954 | pid_t pid = 0; | |
1955 | ||
1956 | rcu_read_lock(); | |
1957 | if (pid_alive(tsk)) | |
1958 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1959 | rcu_read_unlock(); | |
1960 | ||
1961 | return pid; | |
1962 | } | |
1963 | ||
1964 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1965 | { | |
1966 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1967 | } | |
1968 | ||
52ee2dfd ON |
1969 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1970 | struct pid_namespace *ns) | |
7af57294 | 1971 | { |
52ee2dfd | 1972 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1973 | } |
1974 | ||
7af57294 PE |
1975 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1976 | { | |
52ee2dfd | 1977 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1978 | } |
1979 | ||
1980 | ||
52ee2dfd ON |
1981 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1982 | struct pid_namespace *ns) | |
7af57294 | 1983 | { |
52ee2dfd | 1984 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1985 | } |
1986 | ||
7af57294 PE |
1987 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1988 | { | |
52ee2dfd | 1989 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1990 | } |
1991 | ||
1b0f7ffd ON |
1992 | /* obsolete, do not use */ |
1993 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1994 | { | |
1995 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1996 | } | |
7af57294 | 1997 | |
1da177e4 LT |
1998 | /** |
1999 | * pid_alive - check that a task structure is not stale | |
2000 | * @p: Task structure to be checked. | |
2001 | * | |
2002 | * Test if a process is not yet dead (at most zombie state) | |
2003 | * If pid_alive fails, then pointers within the task structure | |
2004 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
2005 | * |
2006 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 2007 | */ |
ad36d282 | 2008 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 2009 | { |
92476d7f | 2010 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
2011 | } |
2012 | ||
f400e198 | 2013 | /** |
b460cbc5 | 2014 | * is_global_init - check if a task structure is init |
3260259f H |
2015 | * @tsk: Task structure to be checked. |
2016 | * | |
2017 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
2018 | * |
2019 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 2020 | */ |
e868171a | 2021 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
2022 | { |
2023 | return tsk->pid == 1; | |
2024 | } | |
b460cbc5 | 2025 | |
9ec52099 CLG |
2026 | extern struct pid *cad_pid; |
2027 | ||
1da177e4 | 2028 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 2029 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 2030 | |
158d9ebd | 2031 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
2032 | |
2033 | static inline void put_task_struct(struct task_struct *t) | |
2034 | { | |
2035 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 2036 | __put_task_struct(t); |
e56d0903 | 2037 | } |
1da177e4 | 2038 | |
6a61671b FW |
2039 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
2040 | extern void task_cputime(struct task_struct *t, | |
2041 | cputime_t *utime, cputime_t *stime); | |
2042 | extern void task_cputime_scaled(struct task_struct *t, | |
2043 | cputime_t *utimescaled, cputime_t *stimescaled); | |
2044 | extern cputime_t task_gtime(struct task_struct *t); | |
2045 | #else | |
6fac4829 FW |
2046 | static inline void task_cputime(struct task_struct *t, |
2047 | cputime_t *utime, cputime_t *stime) | |
2048 | { | |
2049 | if (utime) | |
2050 | *utime = t->utime; | |
2051 | if (stime) | |
2052 | *stime = t->stime; | |
2053 | } | |
2054 | ||
2055 | static inline void task_cputime_scaled(struct task_struct *t, | |
2056 | cputime_t *utimescaled, | |
2057 | cputime_t *stimescaled) | |
2058 | { | |
2059 | if (utimescaled) | |
2060 | *utimescaled = t->utimescaled; | |
2061 | if (stimescaled) | |
2062 | *stimescaled = t->stimescaled; | |
2063 | } | |
6a61671b FW |
2064 | |
2065 | static inline cputime_t task_gtime(struct task_struct *t) | |
2066 | { | |
2067 | return t->gtime; | |
2068 | } | |
2069 | #endif | |
e80d0a1a FW |
2070 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
2071 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 2072 | |
1da177e4 LT |
2073 | /* |
2074 | * Per process flags | |
2075 | */ | |
1da177e4 | 2076 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 2077 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 2078 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 2079 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 2080 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 2081 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
2082 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
2083 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
2084 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
2085 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 2086 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 2087 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 2088 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
2089 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
2090 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
2091 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
2092 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 2093 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 2094 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 2095 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
2096 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
2097 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
14a40ffc | 2098 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 2099 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 2100 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 2101 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 2102 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
2103 | |
2104 | /* | |
2105 | * Only the _current_ task can read/write to tsk->flags, but other | |
2106 | * tasks can access tsk->flags in readonly mode for example | |
2107 | * with tsk_used_math (like during threaded core dumping). | |
2108 | * There is however an exception to this rule during ptrace | |
2109 | * or during fork: the ptracer task is allowed to write to the | |
2110 | * child->flags of its traced child (same goes for fork, the parent | |
2111 | * can write to the child->flags), because we're guaranteed the | |
2112 | * child is not running and in turn not changing child->flags | |
2113 | * at the same time the parent does it. | |
2114 | */ | |
2115 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
2116 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
2117 | #define clear_used_math() clear_stopped_child_used_math(current) | |
2118 | #define set_used_math() set_stopped_child_used_math(current) | |
2119 | #define conditional_stopped_child_used_math(condition, child) \ | |
2120 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
2121 | #define conditional_used_math(condition) \ | |
2122 | conditional_stopped_child_used_math(condition, current) | |
2123 | #define copy_to_stopped_child_used_math(child) \ | |
2124 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
2125 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
2126 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
2127 | #define used_math() tsk_used_math(current) | |
2128 | ||
934f3072 JB |
2129 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags |
2130 | * __GFP_FS is also cleared as it implies __GFP_IO. | |
2131 | */ | |
21caf2fc ML |
2132 | static inline gfp_t memalloc_noio_flags(gfp_t flags) |
2133 | { | |
2134 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
934f3072 | 2135 | flags &= ~(__GFP_IO | __GFP_FS); |
21caf2fc ML |
2136 | return flags; |
2137 | } | |
2138 | ||
2139 | static inline unsigned int memalloc_noio_save(void) | |
2140 | { | |
2141 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
2142 | current->flags |= PF_MEMALLOC_NOIO; | |
2143 | return flags; | |
2144 | } | |
2145 | ||
2146 | static inline void memalloc_noio_restore(unsigned int flags) | |
2147 | { | |
2148 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
2149 | } | |
2150 | ||
1d4457f9 | 2151 | /* Per-process atomic flags. */ |
a2b86f77 | 2152 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
2ad654bc ZL |
2153 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ |
2154 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
2155 | ||
1d4457f9 | 2156 | |
e0e5070b ZL |
2157 | #define TASK_PFA_TEST(name, func) \ |
2158 | static inline bool task_##func(struct task_struct *p) \ | |
2159 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
2160 | #define TASK_PFA_SET(name, func) \ | |
2161 | static inline void task_set_##func(struct task_struct *p) \ | |
2162 | { set_bit(PFA_##name, &p->atomic_flags); } | |
2163 | #define TASK_PFA_CLEAR(name, func) \ | |
2164 | static inline void task_clear_##func(struct task_struct *p) \ | |
2165 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
2166 | ||
2167 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
2168 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 2169 | |
2ad654bc ZL |
2170 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
2171 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
2172 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
2173 | ||
2174 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
2175 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
2176 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 2177 | |
e5c1902e | 2178 | /* |
a8f072c1 | 2179 | * task->jobctl flags |
e5c1902e | 2180 | */ |
a8f072c1 | 2181 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 2182 | |
a8f072c1 TH |
2183 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
2184 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
2185 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 2186 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 2187 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 2188 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 2189 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 | 2190 | |
b76808e6 PD |
2191 | #define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT) |
2192 | #define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT) | |
2193 | #define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT) | |
2194 | #define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT) | |
2195 | #define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT) | |
2196 | #define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT) | |
2197 | #define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT) | |
a8f072c1 | 2198 | |
fb1d910c | 2199 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 2200 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 2201 | |
7dd3db54 | 2202 | extern bool task_set_jobctl_pending(struct task_struct *task, |
b76808e6 | 2203 | unsigned long mask); |
73ddff2b | 2204 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 | 2205 | extern void task_clear_jobctl_pending(struct task_struct *task, |
b76808e6 | 2206 | unsigned long mask); |
39efa3ef | 2207 | |
f41d911f PM |
2208 | static inline void rcu_copy_process(struct task_struct *p) |
2209 | { | |
8315f422 | 2210 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f | 2211 | p->rcu_read_lock_nesting = 0; |
1d082fd0 | 2212 | p->rcu_read_unlock_special.s = 0; |
dd5d19ba | 2213 | p->rcu_blocked_node = NULL; |
f41d911f | 2214 | INIT_LIST_HEAD(&p->rcu_node_entry); |
8315f422 PM |
2215 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
2216 | #ifdef CONFIG_TASKS_RCU | |
2217 | p->rcu_tasks_holdout = false; | |
2218 | INIT_LIST_HEAD(&p->rcu_tasks_holdout_list); | |
176f8f7a | 2219 | p->rcu_tasks_idle_cpu = -1; |
8315f422 | 2220 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
f41d911f PM |
2221 | } |
2222 | ||
907aed48 MG |
2223 | static inline void tsk_restore_flags(struct task_struct *task, |
2224 | unsigned long orig_flags, unsigned long flags) | |
2225 | { | |
2226 | task->flags &= ~flags; | |
2227 | task->flags |= orig_flags & flags; | |
2228 | } | |
2229 | ||
f82f8042 JL |
2230 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, |
2231 | const struct cpumask *trial); | |
7f51412a JL |
2232 | extern int task_can_attach(struct task_struct *p, |
2233 | const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 2234 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
2235 | extern void do_set_cpus_allowed(struct task_struct *p, |
2236 | const struct cpumask *new_mask); | |
2237 | ||
cd8ba7cd | 2238 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2239 | const struct cpumask *new_mask); |
1da177e4 | 2240 | #else |
1e1b6c51 KM |
2241 | static inline void do_set_cpus_allowed(struct task_struct *p, |
2242 | const struct cpumask *new_mask) | |
2243 | { | |
2244 | } | |
cd8ba7cd | 2245 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2246 | const struct cpumask *new_mask) |
1da177e4 | 2247 | { |
96f874e2 | 2248 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
2249 | return -EINVAL; |
2250 | return 0; | |
2251 | } | |
2252 | #endif | |
e0ad9556 | 2253 | |
3451d024 | 2254 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
2255 | void calc_load_enter_idle(void); |
2256 | void calc_load_exit_idle(void); | |
2257 | #else | |
2258 | static inline void calc_load_enter_idle(void) { } | |
2259 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 2260 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 2261 | |
b342501c | 2262 | /* |
c676329a PZ |
2263 | * Do not use outside of architecture code which knows its limitations. |
2264 | * | |
2265 | * sched_clock() has no promise of monotonicity or bounded drift between | |
2266 | * CPUs, use (which you should not) requires disabling IRQs. | |
2267 | * | |
2268 | * Please use one of the three interfaces below. | |
b342501c | 2269 | */ |
1bbfa6f2 | 2270 | extern unsigned long long notrace sched_clock(void); |
c676329a | 2271 | /* |
489a71b0 | 2272 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
2273 | */ |
2274 | extern u64 cpu_clock(int cpu); | |
2275 | extern u64 local_clock(void); | |
545a2bf7 | 2276 | extern u64 running_clock(void); |
c676329a PZ |
2277 | extern u64 sched_clock_cpu(int cpu); |
2278 | ||
e436d800 | 2279 | |
c1955a3d | 2280 | extern void sched_clock_init(void); |
3e51f33f | 2281 | |
c1955a3d | 2282 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
2283 | static inline void sched_clock_tick(void) |
2284 | { | |
2285 | } | |
2286 | ||
2287 | static inline void sched_clock_idle_sleep_event(void) | |
2288 | { | |
2289 | } | |
2290 | ||
2291 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
2292 | { | |
2293 | } | |
2294 | #else | |
c676329a PZ |
2295 | /* |
2296 | * Architectures can set this to 1 if they have specified | |
2297 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
2298 | * but then during bootup it turns out that sched_clock() | |
2299 | * is reliable after all: | |
2300 | */ | |
35af99e6 PZ |
2301 | extern int sched_clock_stable(void); |
2302 | extern void set_sched_clock_stable(void); | |
2303 | extern void clear_sched_clock_stable(void); | |
c676329a | 2304 | |
3e51f33f PZ |
2305 | extern void sched_clock_tick(void); |
2306 | extern void sched_clock_idle_sleep_event(void); | |
2307 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
2308 | #endif | |
2309 | ||
b52bfee4 VP |
2310 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
2311 | /* | |
2312 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
2313 | * The reason for this explicit opt-in is not to have perf penalty with | |
2314 | * slow sched_clocks. | |
2315 | */ | |
2316 | extern void enable_sched_clock_irqtime(void); | |
2317 | extern void disable_sched_clock_irqtime(void); | |
2318 | #else | |
2319 | static inline void enable_sched_clock_irqtime(void) {} | |
2320 | static inline void disable_sched_clock_irqtime(void) {} | |
2321 | #endif | |
2322 | ||
36c8b586 | 2323 | extern unsigned long long |
41b86e9c | 2324 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2325 | |
2326 | /* sched_exec is called by processes performing an exec */ | |
2327 | #ifdef CONFIG_SMP | |
2328 | extern void sched_exec(void); | |
2329 | #else | |
2330 | #define sched_exec() {} | |
2331 | #endif | |
2332 | ||
2aa44d05 IM |
2333 | extern void sched_clock_idle_sleep_event(void); |
2334 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2335 | |
1da177e4 LT |
2336 | #ifdef CONFIG_HOTPLUG_CPU |
2337 | extern void idle_task_exit(void); | |
2338 | #else | |
2339 | static inline void idle_task_exit(void) {} | |
2340 | #endif | |
2341 | ||
3451d024 | 2342 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 2343 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 2344 | #else |
1c20091e | 2345 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
2346 | #endif |
2347 | ||
ce831b38 FW |
2348 | #ifdef CONFIG_NO_HZ_FULL |
2349 | extern bool sched_can_stop_tick(void); | |
265f22a9 | 2350 | extern u64 scheduler_tick_max_deferment(void); |
ce831b38 FW |
2351 | #else |
2352 | static inline bool sched_can_stop_tick(void) { return false; } | |
06d8308c TG |
2353 | #endif |
2354 | ||
5091faa4 | 2355 | #ifdef CONFIG_SCHED_AUTOGROUP |
5091faa4 MG |
2356 | extern void sched_autogroup_create_attach(struct task_struct *p); |
2357 | extern void sched_autogroup_detach(struct task_struct *p); | |
2358 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2359 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2360 | #ifdef CONFIG_PROC_FS | |
2361 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2362 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2363 | #endif |
2364 | #else | |
2365 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2366 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2367 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2368 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2369 | #endif | |
2370 | ||
fa93384f | 2371 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2372 | extern void set_user_nice(struct task_struct *p, long nice); |
2373 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
2374 | /** |
2375 | * task_nice - return the nice value of a given task. | |
2376 | * @p: the task in question. | |
2377 | * | |
2378 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
2379 | */ | |
2380 | static inline int task_nice(const struct task_struct *p) | |
2381 | { | |
2382 | return PRIO_TO_NICE((p)->static_prio); | |
2383 | } | |
36c8b586 IM |
2384 | extern int can_nice(const struct task_struct *p, const int nice); |
2385 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2386 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2387 | extern int sched_setscheduler(struct task_struct *, int, |
2388 | const struct sched_param *); | |
961ccddd | 2389 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2390 | const struct sched_param *); |
d50dde5a DF |
2391 | extern int sched_setattr(struct task_struct *, |
2392 | const struct sched_attr *); | |
36c8b586 | 2393 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2394 | /** |
2395 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2396 | * @p: the task in question. |
e69f6186 YB |
2397 | * |
2398 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 2399 | */ |
7061ca3b | 2400 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2401 | { |
2402 | return p->pid == 0; | |
2403 | } | |
36c8b586 IM |
2404 | extern struct task_struct *curr_task(int cpu); |
2405 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2406 | |
2407 | void yield(void); | |
2408 | ||
1da177e4 LT |
2409 | union thread_union { |
2410 | struct thread_info thread_info; | |
2411 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2412 | }; | |
2413 | ||
2414 | #ifndef __HAVE_ARCH_KSTACK_END | |
2415 | static inline int kstack_end(void *addr) | |
2416 | { | |
2417 | /* Reliable end of stack detection: | |
2418 | * Some APM bios versions misalign the stack | |
2419 | */ | |
2420 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2421 | } | |
2422 | #endif | |
2423 | ||
2424 | extern union thread_union init_thread_union; | |
2425 | extern struct task_struct init_task; | |
2426 | ||
2427 | extern struct mm_struct init_mm; | |
2428 | ||
198fe21b PE |
2429 | extern struct pid_namespace init_pid_ns; |
2430 | ||
2431 | /* | |
2432 | * find a task by one of its numerical ids | |
2433 | * | |
198fe21b PE |
2434 | * find_task_by_pid_ns(): |
2435 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2436 | * find_task_by_vpid(): |
2437 | * finds a task by its virtual pid | |
198fe21b | 2438 | * |
e49859e7 | 2439 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2440 | */ |
2441 | ||
228ebcbe PE |
2442 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2443 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2444 | struct pid_namespace *ns); | |
198fe21b | 2445 | |
1da177e4 | 2446 | /* per-UID process charging. */ |
7b44ab97 | 2447 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2448 | static inline struct user_struct *get_uid(struct user_struct *u) |
2449 | { | |
2450 | atomic_inc(&u->__count); | |
2451 | return u; | |
2452 | } | |
2453 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2454 | |
2455 | #include <asm/current.h> | |
2456 | ||
f0af911a | 2457 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2458 | |
b3c97528 HH |
2459 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2460 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2461 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2462 | #ifdef CONFIG_SMP |
2463 | extern void kick_process(struct task_struct *tsk); | |
2464 | #else | |
2465 | static inline void kick_process(struct task_struct *tsk) { } | |
2466 | #endif | |
aab03e05 | 2467 | extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
ad46c2c4 | 2468 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2469 | |
1da177e4 LT |
2470 | extern void proc_caches_init(void); |
2471 | extern void flush_signals(struct task_struct *); | |
10ab825b | 2472 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2473 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2474 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2475 | ||
2476 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2477 | { | |
2478 | unsigned long flags; | |
2479 | int ret; | |
2480 | ||
2481 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2482 | ret = dequeue_signal(tsk, mask, info); | |
2483 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2484 | ||
2485 | return ret; | |
53c8f9f1 | 2486 | } |
1da177e4 LT |
2487 | |
2488 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2489 | sigset_t *mask); | |
2490 | extern void unblock_all_signals(void); | |
2491 | extern void release_task(struct task_struct * p); | |
2492 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2493 | extern int force_sigsegv(int, struct task_struct *); |
2494 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2495 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2496 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2497 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2498 | const struct cred *, u32); | |
c4b92fc1 EB |
2499 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2500 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2501 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2502 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2503 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2504 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2505 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2506 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2507 | extern struct sigqueue *sigqueue_alloc(void); |
2508 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2509 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2510 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 | 2511 | |
51a7b448 AV |
2512 | static inline void restore_saved_sigmask(void) |
2513 | { | |
2514 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2515 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2516 | } |
2517 | ||
b7f9a11a AV |
2518 | static inline sigset_t *sigmask_to_save(void) |
2519 | { | |
2520 | sigset_t *res = ¤t->blocked; | |
2521 | if (unlikely(test_restore_sigmask())) | |
2522 | res = ¤t->saved_sigmask; | |
2523 | return res; | |
2524 | } | |
2525 | ||
9ec52099 CLG |
2526 | static inline int kill_cad_pid(int sig, int priv) |
2527 | { | |
2528 | return kill_pid(cad_pid, sig, priv); | |
2529 | } | |
2530 | ||
1da177e4 LT |
2531 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2532 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2533 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2534 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2535 | ||
2a855dd0 SAS |
2536 | /* |
2537 | * True if we are on the alternate signal stack. | |
2538 | */ | |
1da177e4 LT |
2539 | static inline int on_sig_stack(unsigned long sp) |
2540 | { | |
2a855dd0 SAS |
2541 | #ifdef CONFIG_STACK_GROWSUP |
2542 | return sp >= current->sas_ss_sp && | |
2543 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2544 | #else | |
2545 | return sp > current->sas_ss_sp && | |
2546 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2547 | #endif | |
1da177e4 LT |
2548 | } |
2549 | ||
2550 | static inline int sas_ss_flags(unsigned long sp) | |
2551 | { | |
72f15c03 RW |
2552 | if (!current->sas_ss_size) |
2553 | return SS_DISABLE; | |
2554 | ||
2555 | return on_sig_stack(sp) ? SS_ONSTACK : 0; | |
1da177e4 LT |
2556 | } |
2557 | ||
5a1b98d3 AV |
2558 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) |
2559 | { | |
2560 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
2561 | #ifdef CONFIG_STACK_GROWSUP | |
2562 | return current->sas_ss_sp; | |
2563 | #else | |
2564 | return current->sas_ss_sp + current->sas_ss_size; | |
2565 | #endif | |
2566 | return sp; | |
2567 | } | |
2568 | ||
1da177e4 LT |
2569 | /* |
2570 | * Routines for handling mm_structs | |
2571 | */ | |
2572 | extern struct mm_struct * mm_alloc(void); | |
2573 | ||
2574 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2575 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2576 | static inline void mmdrop(struct mm_struct * mm) |
2577 | { | |
6fb43d7b | 2578 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2579 | __mmdrop(mm); |
2580 | } | |
2581 | ||
2582 | /* mmput gets rid of the mappings and all user-space */ | |
2583 | extern void mmput(struct mm_struct *); | |
2584 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2585 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2586 | /* |
2587 | * Grab a reference to a task's mm, if it is not already going away | |
2588 | * and ptrace_may_access with the mode parameter passed to it | |
2589 | * succeeds. | |
2590 | */ | |
2591 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2592 | /* Remove the current tasks stale references to the old mm_struct */ |
2593 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
2594 | ||
3033f14a JT |
2595 | #ifdef CONFIG_HAVE_COPY_THREAD_TLS |
2596 | extern int copy_thread_tls(unsigned long, unsigned long, unsigned long, | |
2597 | struct task_struct *, unsigned long); | |
2598 | #else | |
6f2c55b8 | 2599 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2600 | struct task_struct *); |
3033f14a JT |
2601 | |
2602 | /* Architectures that haven't opted into copy_thread_tls get the tls argument | |
2603 | * via pt_regs, so ignore the tls argument passed via C. */ | |
2604 | static inline int copy_thread_tls( | |
2605 | unsigned long clone_flags, unsigned long sp, unsigned long arg, | |
2606 | struct task_struct *p, unsigned long tls) | |
2607 | { | |
2608 | return copy_thread(clone_flags, sp, arg, p); | |
2609 | } | |
2610 | #endif | |
1da177e4 LT |
2611 | extern void flush_thread(void); |
2612 | extern void exit_thread(void); | |
2613 | ||
1da177e4 | 2614 | extern void exit_files(struct task_struct *); |
a7e5328a | 2615 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2616 | |
1da177e4 | 2617 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2618 | extern void flush_itimer_signals(void); |
1da177e4 | 2619 | |
9402c95f | 2620 | extern void do_group_exit(int); |
1da177e4 | 2621 | |
c4ad8f98 | 2622 | extern int do_execve(struct filename *, |
d7627467 | 2623 | const char __user * const __user *, |
da3d4c5f | 2624 | const char __user * const __user *); |
51f39a1f DD |
2625 | extern int do_execveat(int, struct filename *, |
2626 | const char __user * const __user *, | |
2627 | const char __user * const __user *, | |
2628 | int); | |
3033f14a | 2629 | extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long); |
e80d6661 | 2630 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2631 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2632 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 | 2633 | |
82b89778 AH |
2634 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
2635 | static inline void set_task_comm(struct task_struct *tsk, const char *from) | |
2636 | { | |
2637 | __set_task_comm(tsk, from, false); | |
2638 | } | |
59714d65 | 2639 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2640 | |
2641 | #ifdef CONFIG_SMP | |
317f3941 | 2642 | void scheduler_ipi(void); |
85ba2d86 | 2643 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2644 | #else |
184748cc | 2645 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2646 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2647 | long match_state) | |
2648 | { | |
2649 | return 1; | |
2650 | } | |
1da177e4 LT |
2651 | #endif |
2652 | ||
fafe870f FW |
2653 | #define tasklist_empty() \ |
2654 | list_empty(&init_task.tasks) | |
2655 | ||
05725f7e JP |
2656 | #define next_task(p) \ |
2657 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2658 | |
2659 | #define for_each_process(p) \ | |
2660 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2661 | ||
5bb459bb | 2662 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2663 | |
1da177e4 LT |
2664 | /* |
2665 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2666 | * 'break' will not work as expected - use goto instead. | |
2667 | */ | |
2668 | #define do_each_thread(g, t) \ | |
2669 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2670 | ||
2671 | #define while_each_thread(g, t) \ | |
2672 | while ((t = next_thread(t)) != g) | |
2673 | ||
0c740d0a ON |
2674 | #define __for_each_thread(signal, t) \ |
2675 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
2676 | ||
2677 | #define for_each_thread(p, t) \ | |
2678 | __for_each_thread((p)->signal, t) | |
2679 | ||
2680 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
2681 | #define for_each_process_thread(p, t) \ | |
2682 | for_each_process(p) for_each_thread(p, t) | |
2683 | ||
7e49827c ON |
2684 | static inline int get_nr_threads(struct task_struct *tsk) |
2685 | { | |
b3ac022c | 2686 | return tsk->signal->nr_threads; |
7e49827c ON |
2687 | } |
2688 | ||
087806b1 ON |
2689 | static inline bool thread_group_leader(struct task_struct *p) |
2690 | { | |
2691 | return p->exit_signal >= 0; | |
2692 | } | |
1da177e4 | 2693 | |
0804ef4b EB |
2694 | /* Do to the insanities of de_thread it is possible for a process |
2695 | * to have the pid of the thread group leader without actually being | |
2696 | * the thread group leader. For iteration through the pids in proc | |
2697 | * all we care about is that we have a task with the appropriate | |
2698 | * pid, we don't actually care if we have the right task. | |
2699 | */ | |
e1403b8e | 2700 | static inline bool has_group_leader_pid(struct task_struct *p) |
0804ef4b | 2701 | { |
e1403b8e | 2702 | return task_pid(p) == p->signal->leader_pid; |
0804ef4b EB |
2703 | } |
2704 | ||
bac0abd6 | 2705 | static inline |
e1403b8e | 2706 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) |
bac0abd6 | 2707 | { |
e1403b8e | 2708 | return p1->signal == p2->signal; |
bac0abd6 PE |
2709 | } |
2710 | ||
36c8b586 | 2711 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2712 | { |
05725f7e JP |
2713 | return list_entry_rcu(p->thread_group.next, |
2714 | struct task_struct, thread_group); | |
47e65328 ON |
2715 | } |
2716 | ||
e868171a | 2717 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2718 | { |
47e65328 | 2719 | return list_empty(&p->thread_group); |
1da177e4 LT |
2720 | } |
2721 | ||
2722 | #define delay_group_leader(p) \ | |
2723 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2724 | ||
1da177e4 | 2725 | /* |
260ea101 | 2726 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2727 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2728 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2729 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2730 | * |
2731 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2732 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2733 | * neither inside nor outside. | |
2734 | */ | |
2735 | static inline void task_lock(struct task_struct *p) | |
2736 | { | |
2737 | spin_lock(&p->alloc_lock); | |
2738 | } | |
2739 | ||
2740 | static inline void task_unlock(struct task_struct *p) | |
2741 | { | |
2742 | spin_unlock(&p->alloc_lock); | |
2743 | } | |
2744 | ||
b8ed374e | 2745 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2746 | unsigned long *flags); |
2747 | ||
9388dc30 AV |
2748 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2749 | unsigned long *flags) | |
2750 | { | |
2751 | struct sighand_struct *ret; | |
2752 | ||
2753 | ret = __lock_task_sighand(tsk, flags); | |
2754 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2755 | return ret; | |
2756 | } | |
b8ed374e | 2757 | |
f63ee72e ON |
2758 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2759 | unsigned long *flags) | |
2760 | { | |
2761 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2762 | } | |
2763 | ||
77e4ef99 | 2764 | /** |
7d7efec3 TH |
2765 | * threadgroup_change_begin - mark the beginning of changes to a threadgroup |
2766 | * @tsk: task causing the changes | |
77e4ef99 | 2767 | * |
7d7efec3 TH |
2768 | * All operations which modify a threadgroup - a new thread joining the |
2769 | * group, death of a member thread (the assertion of PF_EXITING) and | |
2770 | * exec(2) dethreading the process and replacing the leader - are wrapped | |
2771 | * by threadgroup_change_{begin|end}(). This is to provide a place which | |
2772 | * subsystems needing threadgroup stability can hook into for | |
2773 | * synchronization. | |
77e4ef99 | 2774 | */ |
7d7efec3 | 2775 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2776 | { |
7d7efec3 TH |
2777 | might_sleep(); |
2778 | cgroup_threadgroup_change_begin(tsk); | |
4714d1d3 | 2779 | } |
77e4ef99 TH |
2780 | |
2781 | /** | |
7d7efec3 TH |
2782 | * threadgroup_change_end - mark the end of changes to a threadgroup |
2783 | * @tsk: task causing the changes | |
77e4ef99 | 2784 | * |
7d7efec3 | 2785 | * See threadgroup_change_begin(). |
77e4ef99 | 2786 | */ |
7d7efec3 | 2787 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2788 | { |
7d7efec3 | 2789 | cgroup_threadgroup_change_end(tsk); |
4714d1d3 | 2790 | } |
4714d1d3 | 2791 | |
f037360f AV |
2792 | #ifndef __HAVE_THREAD_FUNCTIONS |
2793 | ||
f7e4217b RZ |
2794 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2795 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2796 | |
10ebffde AV |
2797 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2798 | { | |
2799 | *task_thread_info(p) = *task_thread_info(org); | |
2800 | task_thread_info(p)->task = p; | |
2801 | } | |
2802 | ||
6a40281a CE |
2803 | /* |
2804 | * Return the address of the last usable long on the stack. | |
2805 | * | |
2806 | * When the stack grows down, this is just above the thread | |
2807 | * info struct. Going any lower will corrupt the threadinfo. | |
2808 | * | |
2809 | * When the stack grows up, this is the highest address. | |
2810 | * Beyond that position, we corrupt data on the next page. | |
2811 | */ | |
10ebffde AV |
2812 | static inline unsigned long *end_of_stack(struct task_struct *p) |
2813 | { | |
6a40281a CE |
2814 | #ifdef CONFIG_STACK_GROWSUP |
2815 | return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1; | |
2816 | #else | |
f7e4217b | 2817 | return (unsigned long *)(task_thread_info(p) + 1); |
6a40281a | 2818 | #endif |
10ebffde AV |
2819 | } |
2820 | ||
f037360f | 2821 | #endif |
a70857e4 AT |
2822 | #define task_stack_end_corrupted(task) \ |
2823 | (*(end_of_stack(task)) != STACK_END_MAGIC) | |
f037360f | 2824 | |
8b05c7e6 FT |
2825 | static inline int object_is_on_stack(void *obj) |
2826 | { | |
2827 | void *stack = task_stack_page(current); | |
2828 | ||
2829 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2830 | } | |
2831 | ||
8c9843e5 BH |
2832 | extern void thread_info_cache_init(void); |
2833 | ||
7c9f8861 ES |
2834 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2835 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2836 | { | |
2837 | unsigned long *n = end_of_stack(p); | |
2838 | ||
2839 | do { /* Skip over canary */ | |
2840 | n++; | |
2841 | } while (!*n); | |
2842 | ||
2843 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2844 | } | |
2845 | #endif | |
d4311ff1 | 2846 | extern void set_task_stack_end_magic(struct task_struct *tsk); |
7c9f8861 | 2847 | |
1da177e4 LT |
2848 | /* set thread flags in other task's structures |
2849 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2850 | */ | |
2851 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2852 | { | |
a1261f54 | 2853 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2854 | } |
2855 | ||
2856 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2857 | { | |
a1261f54 | 2858 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2859 | } |
2860 | ||
2861 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2862 | { | |
a1261f54 | 2863 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2864 | } |
2865 | ||
2866 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2867 | { | |
a1261f54 | 2868 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2869 | } |
2870 | ||
2871 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2872 | { | |
a1261f54 | 2873 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2874 | } |
2875 | ||
2876 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2877 | { | |
2878 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2879 | } | |
2880 | ||
2881 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2882 | { | |
2883 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2884 | } | |
2885 | ||
8ae121ac GH |
2886 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2887 | { | |
2888 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2889 | } | |
2890 | ||
690cc3ff EB |
2891 | static inline int restart_syscall(void) |
2892 | { | |
2893 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2894 | return -ERESTARTNOINTR; | |
2895 | } | |
2896 | ||
1da177e4 LT |
2897 | static inline int signal_pending(struct task_struct *p) |
2898 | { | |
2899 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2900 | } | |
f776d12d | 2901 | |
d9588725 RM |
2902 | static inline int __fatal_signal_pending(struct task_struct *p) |
2903 | { | |
2904 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2905 | } | |
f776d12d MW |
2906 | |
2907 | static inline int fatal_signal_pending(struct task_struct *p) | |
2908 | { | |
2909 | return signal_pending(p) && __fatal_signal_pending(p); | |
2910 | } | |
2911 | ||
16882c1e ON |
2912 | static inline int signal_pending_state(long state, struct task_struct *p) |
2913 | { | |
2914 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2915 | return 0; | |
2916 | if (!signal_pending(p)) | |
2917 | return 0; | |
2918 | ||
16882c1e ON |
2919 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2920 | } | |
2921 | ||
1da177e4 LT |
2922 | /* |
2923 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2924 | * explicit rescheduling in places that are safe. The return | |
2925 | * value indicates whether a reschedule was done in fact. | |
2926 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2927 | * cond_resched_softirq() will enable bhs before scheduling. | |
2928 | */ | |
c3921ab7 | 2929 | extern int _cond_resched(void); |
6f80bd98 | 2930 | |
613afbf8 | 2931 | #define cond_resched() ({ \ |
3427445a | 2932 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2933 | _cond_resched(); \ |
2934 | }) | |
6f80bd98 | 2935 | |
613afbf8 FW |
2936 | extern int __cond_resched_lock(spinlock_t *lock); |
2937 | ||
2938 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 2939 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
2940 | __cond_resched_lock(lock); \ |
2941 | }) | |
2942 | ||
2943 | extern int __cond_resched_softirq(void); | |
2944 | ||
75e1056f | 2945 | #define cond_resched_softirq() ({ \ |
3427445a | 2946 | ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
75e1056f | 2947 | __cond_resched_softirq(); \ |
613afbf8 | 2948 | }) |
1da177e4 | 2949 | |
f6f3c437 SH |
2950 | static inline void cond_resched_rcu(void) |
2951 | { | |
2952 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2953 | rcu_read_unlock(); | |
2954 | cond_resched(); | |
2955 | rcu_read_lock(); | |
2956 | #endif | |
2957 | } | |
2958 | ||
1da177e4 LT |
2959 | /* |
2960 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2961 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2962 | * but a general need for low latency) | |
1da177e4 | 2963 | */ |
95c354fe | 2964 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2965 | { |
95c354fe NP |
2966 | #ifdef CONFIG_PREEMPT |
2967 | return spin_is_contended(lock); | |
2968 | #else | |
1da177e4 | 2969 | return 0; |
95c354fe | 2970 | #endif |
1da177e4 LT |
2971 | } |
2972 | ||
ee761f62 TG |
2973 | /* |
2974 | * Idle thread specific functions to determine the need_resched | |
69dd0f84 | 2975 | * polling state. |
ee761f62 | 2976 | */ |
69dd0f84 | 2977 | #ifdef TIF_POLLING_NRFLAG |
ee761f62 TG |
2978 | static inline int tsk_is_polling(struct task_struct *p) |
2979 | { | |
2980 | return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); | |
2981 | } | |
ea811747 PZ |
2982 | |
2983 | static inline void __current_set_polling(void) | |
3a98f871 TG |
2984 | { |
2985 | set_thread_flag(TIF_POLLING_NRFLAG); | |
2986 | } | |
2987 | ||
ea811747 PZ |
2988 | static inline bool __must_check current_set_polling_and_test(void) |
2989 | { | |
2990 | __current_set_polling(); | |
2991 | ||
2992 | /* | |
2993 | * Polling state must be visible before we test NEED_RESCHED, | |
8875125e | 2994 | * paired by resched_curr() |
ea811747 | 2995 | */ |
4e857c58 | 2996 | smp_mb__after_atomic(); |
ea811747 PZ |
2997 | |
2998 | return unlikely(tif_need_resched()); | |
2999 | } | |
3000 | ||
3001 | static inline void __current_clr_polling(void) | |
3a98f871 TG |
3002 | { |
3003 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
3004 | } | |
ea811747 PZ |
3005 | |
3006 | static inline bool __must_check current_clr_polling_and_test(void) | |
3007 | { | |
3008 | __current_clr_polling(); | |
3009 | ||
3010 | /* | |
3011 | * Polling state must be visible before we test NEED_RESCHED, | |
8875125e | 3012 | * paired by resched_curr() |
ea811747 | 3013 | */ |
4e857c58 | 3014 | smp_mb__after_atomic(); |
ea811747 PZ |
3015 | |
3016 | return unlikely(tif_need_resched()); | |
3017 | } | |
3018 | ||
ee761f62 TG |
3019 | #else |
3020 | static inline int tsk_is_polling(struct task_struct *p) { return 0; } | |
ea811747 PZ |
3021 | static inline void __current_set_polling(void) { } |
3022 | static inline void __current_clr_polling(void) { } | |
3023 | ||
3024 | static inline bool __must_check current_set_polling_and_test(void) | |
3025 | { | |
3026 | return unlikely(tif_need_resched()); | |
3027 | } | |
3028 | static inline bool __must_check current_clr_polling_and_test(void) | |
3029 | { | |
3030 | return unlikely(tif_need_resched()); | |
3031 | } | |
ee761f62 TG |
3032 | #endif |
3033 | ||
8cb75e0c PZ |
3034 | static inline void current_clr_polling(void) |
3035 | { | |
3036 | __current_clr_polling(); | |
3037 | ||
3038 | /* | |
3039 | * Ensure we check TIF_NEED_RESCHED after we clear the polling bit. | |
3040 | * Once the bit is cleared, we'll get IPIs with every new | |
3041 | * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also | |
3042 | * fold. | |
3043 | */ | |
8875125e | 3044 | smp_mb(); /* paired with resched_curr() */ |
8cb75e0c PZ |
3045 | |
3046 | preempt_fold_need_resched(); | |
3047 | } | |
3048 | ||
75f93fed PZ |
3049 | static __always_inline bool need_resched(void) |
3050 | { | |
3051 | return unlikely(tif_need_resched()); | |
3052 | } | |
3053 | ||
f06febc9 FM |
3054 | /* |
3055 | * Thread group CPU time accounting. | |
3056 | */ | |
4cd4c1b4 | 3057 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 3058 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 3059 | |
7bb44ade RM |
3060 | /* |
3061 | * Reevaluate whether the task has signals pending delivery. | |
3062 | * Wake the task if so. | |
3063 | * This is required every time the blocked sigset_t changes. | |
3064 | * callers must hold sighand->siglock. | |
3065 | */ | |
3066 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
3067 | extern void recalc_sigpending(void); |
3068 | ||
910ffdb1 ON |
3069 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
3070 | ||
3071 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
3072 | { | |
3073 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
3074 | } | |
3075 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
3076 | { | |
3077 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
3078 | } | |
1da177e4 LT |
3079 | |
3080 | /* | |
3081 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
3082 | */ | |
3083 | #ifdef CONFIG_SMP | |
3084 | ||
3085 | static inline unsigned int task_cpu(const struct task_struct *p) | |
3086 | { | |
a1261f54 | 3087 | return task_thread_info(p)->cpu; |
1da177e4 LT |
3088 | } |
3089 | ||
b32e86b4 IM |
3090 | static inline int task_node(const struct task_struct *p) |
3091 | { | |
3092 | return cpu_to_node(task_cpu(p)); | |
3093 | } | |
3094 | ||
c65cc870 | 3095 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
3096 | |
3097 | #else | |
3098 | ||
3099 | static inline unsigned int task_cpu(const struct task_struct *p) | |
3100 | { | |
3101 | return 0; | |
3102 | } | |
3103 | ||
3104 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
3105 | { | |
3106 | } | |
3107 | ||
3108 | #endif /* CONFIG_SMP */ | |
3109 | ||
96f874e2 RR |
3110 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
3111 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 3112 | |
7c941438 | 3113 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 3114 | extern struct task_group root_task_group; |
8323f26c | 3115 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 3116 | |
54e99124 DG |
3117 | extern int task_can_switch_user(struct user_struct *up, |
3118 | struct task_struct *tsk); | |
3119 | ||
4b98d11b AD |
3120 | #ifdef CONFIG_TASK_XACCT |
3121 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
3122 | { | |
940389b8 | 3123 | tsk->ioac.rchar += amt; |
4b98d11b AD |
3124 | } |
3125 | ||
3126 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
3127 | { | |
940389b8 | 3128 | tsk->ioac.wchar += amt; |
4b98d11b AD |
3129 | } |
3130 | ||
3131 | static inline void inc_syscr(struct task_struct *tsk) | |
3132 | { | |
940389b8 | 3133 | tsk->ioac.syscr++; |
4b98d11b AD |
3134 | } |
3135 | ||
3136 | static inline void inc_syscw(struct task_struct *tsk) | |
3137 | { | |
940389b8 | 3138 | tsk->ioac.syscw++; |
4b98d11b AD |
3139 | } |
3140 | #else | |
3141 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
3142 | { | |
3143 | } | |
3144 | ||
3145 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
3146 | { | |
3147 | } | |
3148 | ||
3149 | static inline void inc_syscr(struct task_struct *tsk) | |
3150 | { | |
3151 | } | |
3152 | ||
3153 | static inline void inc_syscw(struct task_struct *tsk) | |
3154 | { | |
3155 | } | |
3156 | #endif | |
3157 | ||
82455257 DH |
3158 | #ifndef TASK_SIZE_OF |
3159 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
3160 | #endif | |
3161 | ||
f98bafa0 | 3162 | #ifdef CONFIG_MEMCG |
cf475ad2 | 3163 | extern void mm_update_next_owner(struct mm_struct *mm); |
cf475ad2 BS |
3164 | #else |
3165 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
3166 | { | |
3167 | } | |
f98bafa0 | 3168 | #endif /* CONFIG_MEMCG */ |
cf475ad2 | 3169 | |
3e10e716 JS |
3170 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
3171 | unsigned int limit) | |
3172 | { | |
316c1608 | 3173 | return READ_ONCE(tsk->signal->rlim[limit].rlim_cur); |
3e10e716 JS |
3174 | } |
3175 | ||
3176 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
3177 | unsigned int limit) | |
3178 | { | |
316c1608 | 3179 | return READ_ONCE(tsk->signal->rlim[limit].rlim_max); |
3e10e716 JS |
3180 | } |
3181 | ||
3182 | static inline unsigned long rlimit(unsigned int limit) | |
3183 | { | |
3184 | return task_rlimit(current, limit); | |
3185 | } | |
3186 | ||
3187 | static inline unsigned long rlimit_max(unsigned int limit) | |
3188 | { | |
3189 | return task_rlimit_max(current, limit); | |
3190 | } | |
3191 | ||
1da177e4 | 3192 | #endif |