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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> |
a3b6714e DW |
61 | |
62 | #include <asm/processor.h> | |
36d57ac4 | 63 | |
d50dde5a DF |
64 | #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */ |
65 | ||
66 | /* | |
67 | * Extended scheduling parameters data structure. | |
68 | * | |
69 | * This is needed because the original struct sched_param can not be | |
70 | * altered without introducing ABI issues with legacy applications | |
71 | * (e.g., in sched_getparam()). | |
72 | * | |
73 | * However, the possibility of specifying more than just a priority for | |
74 | * the tasks may be useful for a wide variety of application fields, e.g., | |
75 | * multimedia, streaming, automation and control, and many others. | |
76 | * | |
77 | * This variant (sched_attr) is meant at describing a so-called | |
78 | * sporadic time-constrained task. In such model a task is specified by: | |
79 | * - the activation period or minimum instance inter-arrival time; | |
80 | * - the maximum (or average, depending on the actual scheduling | |
81 | * discipline) computation time of all instances, a.k.a. runtime; | |
82 | * - the deadline (relative to the actual activation time) of each | |
83 | * instance. | |
84 | * Very briefly, a periodic (sporadic) task asks for the execution of | |
85 | * some specific computation --which is typically called an instance-- | |
86 | * (at most) every period. Moreover, each instance typically lasts no more | |
87 | * than the runtime and must be completed by time instant t equal to | |
88 | * the instance activation time + the deadline. | |
89 | * | |
90 | * This is reflected by the actual fields of the sched_attr structure: | |
91 | * | |
92 | * @size size of the structure, for fwd/bwd compat. | |
93 | * | |
94 | * @sched_policy task's scheduling policy | |
95 | * @sched_flags for customizing the scheduler behaviour | |
96 | * @sched_nice task's nice value (SCHED_NORMAL/BATCH) | |
97 | * @sched_priority task's static priority (SCHED_FIFO/RR) | |
98 | * @sched_deadline representative of the task's deadline | |
99 | * @sched_runtime representative of the task's runtime | |
100 | * @sched_period representative of the task's period | |
101 | * | |
102 | * Given this task model, there are a multiplicity of scheduling algorithms | |
103 | * and policies, that can be used to ensure all the tasks will make their | |
104 | * timing constraints. | |
aab03e05 DF |
105 | * |
106 | * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the | |
107 | * only user of this new interface. More information about the algorithm | |
108 | * available in the scheduling class file or in Documentation/. | |
d50dde5a DF |
109 | */ |
110 | struct sched_attr { | |
111 | u32 size; | |
112 | ||
113 | u32 sched_policy; | |
114 | u64 sched_flags; | |
115 | ||
116 | /* SCHED_NORMAL, SCHED_BATCH */ | |
117 | s32 sched_nice; | |
118 | ||
119 | /* SCHED_FIFO, SCHED_RR */ | |
120 | u32 sched_priority; | |
121 | ||
122 | /* SCHED_DEADLINE */ | |
123 | u64 sched_runtime; | |
124 | u64 sched_deadline; | |
125 | u64 sched_period; | |
126 | }; | |
127 | ||
c87e2837 | 128 | struct futex_pi_state; |
286100a6 | 129 | struct robust_list_head; |
bddd87c7 | 130 | struct bio_list; |
5ad4e53b | 131 | struct fs_struct; |
cdd6c482 | 132 | struct perf_event_context; |
73c10101 | 133 | struct blk_plug; |
c4ad8f98 | 134 | struct filename; |
1da177e4 | 135 | |
615d6e87 DB |
136 | #define VMACACHE_BITS 2 |
137 | #define VMACACHE_SIZE (1U << VMACACHE_BITS) | |
138 | #define VMACACHE_MASK (VMACACHE_SIZE - 1) | |
139 | ||
1da177e4 LT |
140 | /* |
141 | * These are the constant used to fake the fixed-point load-average | |
142 | * counting. Some notes: | |
143 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
144 | * a load-average precision of 10 bits integer + 11 bits fractional | |
145 | * - if you want to count load-averages more often, you need more | |
146 | * precision, or rounding will get you. With 2-second counting freq, | |
147 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
148 | * 11 bit fractions. | |
149 | */ | |
150 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 151 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
152 | |
153 | #define FSHIFT 11 /* nr of bits of precision */ | |
154 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 155 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
156 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
157 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
158 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
159 | ||
160 | #define CALC_LOAD(load,exp,n) \ | |
161 | load *= exp; \ | |
162 | load += n*(FIXED_1-exp); \ | |
163 | load >>= FSHIFT; | |
164 | ||
165 | extern unsigned long total_forks; | |
166 | extern int nr_threads; | |
1da177e4 LT |
167 | DECLARE_PER_CPU(unsigned long, process_counts); |
168 | extern int nr_processes(void); | |
169 | extern unsigned long nr_running(void); | |
2ee507c4 | 170 | extern bool single_task_running(void); |
1da177e4 | 171 | extern unsigned long nr_iowait(void); |
8c215bd3 | 172 | extern unsigned long nr_iowait_cpu(int cpu); |
372ba8cb | 173 | extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load); |
69d25870 | 174 | |
0f004f5a | 175 | extern void calc_global_load(unsigned long ticks); |
3289bdb4 PZ |
176 | |
177 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) | |
5aaa0b7a | 178 | extern void update_cpu_load_nohz(void); |
3289bdb4 PZ |
179 | #else |
180 | static inline void update_cpu_load_nohz(void) { } | |
181 | #endif | |
1da177e4 | 182 | |
7e49fcce SR |
183 | extern unsigned long get_parent_ip(unsigned long addr); |
184 | ||
b637a328 PM |
185 | extern void dump_cpu_task(int cpu); |
186 | ||
43ae34cb IM |
187 | struct seq_file; |
188 | struct cfs_rq; | |
4cf86d77 | 189 | struct task_group; |
43ae34cb IM |
190 | #ifdef CONFIG_SCHED_DEBUG |
191 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
192 | extern void proc_sched_set_task(struct task_struct *p); | |
193 | extern void | |
5cef9eca | 194 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
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 TG |
220 | #define TASK_PARKED 512 |
221 | #define TASK_STATE_MAX 1024 | |
f021a3c2 | 222 | |
ad0f614e | 223 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP" |
73342151 | 224 | |
e1781538 PZ |
225 | extern char ___assert_task_state[1 - 2*!!( |
226 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
227 | |
228 | /* Convenience macros for the sake of set_task_state */ | |
229 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
230 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
231 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 232 | |
92a1f4bc MW |
233 | /* Convenience macros for the sake of wake_up */ |
234 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 235 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
236 | |
237 | /* get_task_state() */ | |
238 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 239 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 240 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 241 | |
f021a3c2 MW |
242 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
243 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 244 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 245 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 246 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 247 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 248 | (task->flags & PF_FROZEN) == 0) |
1da177e4 | 249 | |
8eb23b9f PZ |
250 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
251 | ||
252 | #define __set_task_state(tsk, state_value) \ | |
253 | do { \ | |
254 | (tsk)->task_state_change = _THIS_IP_; \ | |
255 | (tsk)->state = (state_value); \ | |
256 | } while (0) | |
257 | #define set_task_state(tsk, state_value) \ | |
258 | do { \ | |
259 | (tsk)->task_state_change = _THIS_IP_; \ | |
260 | set_mb((tsk)->state, (state_value)); \ | |
261 | } while (0) | |
262 | ||
263 | /* | |
264 | * set_current_state() includes a barrier so that the write of current->state | |
265 | * is correctly serialised wrt the caller's subsequent test of whether to | |
266 | * actually sleep: | |
267 | * | |
268 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
269 | * if (do_i_need_to_sleep()) | |
270 | * schedule(); | |
271 | * | |
272 | * If the caller does not need such serialisation then use __set_current_state() | |
273 | */ | |
274 | #define __set_current_state(state_value) \ | |
275 | do { \ | |
276 | current->task_state_change = _THIS_IP_; \ | |
277 | current->state = (state_value); \ | |
278 | } while (0) | |
279 | #define set_current_state(state_value) \ | |
280 | do { \ | |
281 | current->task_state_change = _THIS_IP_; \ | |
282 | set_mb(current->state, (state_value)); \ | |
283 | } while (0) | |
284 | ||
285 | #else | |
286 | ||
1da177e4 LT |
287 | #define __set_task_state(tsk, state_value) \ |
288 | do { (tsk)->state = (state_value); } while (0) | |
289 | #define set_task_state(tsk, state_value) \ | |
290 | set_mb((tsk)->state, (state_value)) | |
291 | ||
498d0c57 AM |
292 | /* |
293 | * set_current_state() includes a barrier so that the write of current->state | |
294 | * is correctly serialised wrt the caller's subsequent test of whether to | |
295 | * actually sleep: | |
296 | * | |
297 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
298 | * if (do_i_need_to_sleep()) | |
299 | * schedule(); | |
300 | * | |
301 | * If the caller does not need such serialisation then use __set_current_state() | |
302 | */ | |
8eb23b9f | 303 | #define __set_current_state(state_value) \ |
1da177e4 | 304 | do { current->state = (state_value); } while (0) |
8eb23b9f | 305 | #define set_current_state(state_value) \ |
1da177e4 LT |
306 | set_mb(current->state, (state_value)) |
307 | ||
8eb23b9f PZ |
308 | #endif |
309 | ||
1da177e4 LT |
310 | /* Task command name length */ |
311 | #define TASK_COMM_LEN 16 | |
312 | ||
1da177e4 LT |
313 | #include <linux/spinlock.h> |
314 | ||
315 | /* | |
316 | * This serializes "schedule()" and also protects | |
317 | * the run-queue from deletions/modifications (but | |
318 | * _adding_ to the beginning of the run-queue has | |
319 | * a separate lock). | |
320 | */ | |
321 | extern rwlock_t tasklist_lock; | |
322 | extern spinlock_t mmlist_lock; | |
323 | ||
36c8b586 | 324 | struct task_struct; |
1da177e4 | 325 | |
db1466b3 PM |
326 | #ifdef CONFIG_PROVE_RCU |
327 | extern int lockdep_tasklist_lock_is_held(void); | |
328 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
329 | ||
1da177e4 LT |
330 | extern void sched_init(void); |
331 | extern void sched_init_smp(void); | |
2d07b255 | 332 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 333 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 334 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 335 | |
3fa0818b RR |
336 | extern cpumask_var_t cpu_isolated_map; |
337 | ||
89f19f04 | 338 | extern int runqueue_is_locked(int cpu); |
017730c1 | 339 | |
3451d024 | 340 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 341 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 342 | extern void set_cpu_sd_state_idle(void); |
6201b4d6 | 343 | extern int get_nohz_timer_target(int pinned); |
46cb4b7c | 344 | #else |
c1cc017c | 345 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 346 | static inline void set_cpu_sd_state_idle(void) { } |
6201b4d6 VK |
347 | static inline int get_nohz_timer_target(int pinned) |
348 | { | |
349 | return smp_processor_id(); | |
350 | } | |
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; |
004417a6 | 387 | void lockup_detector_init(void); |
8446f1d3 | 388 | #else |
8446f1d3 IM |
389 | static inline void touch_softlockup_watchdog(void) |
390 | { | |
391 | } | |
d6ad3e28 JW |
392 | static inline void touch_softlockup_watchdog_sync(void) |
393 | { | |
394 | } | |
04c9167f JF |
395 | static inline void touch_all_softlockup_watchdogs(void) |
396 | { | |
397 | } | |
004417a6 PZ |
398 | static inline void lockup_detector_init(void) |
399 | { | |
400 | } | |
8446f1d3 IM |
401 | #endif |
402 | ||
8b414521 MT |
403 | #ifdef CONFIG_DETECT_HUNG_TASK |
404 | void reset_hung_task_detector(void); | |
405 | #else | |
406 | static inline void reset_hung_task_detector(void) | |
407 | { | |
408 | } | |
409 | #endif | |
410 | ||
1da177e4 LT |
411 | /* Attach to any functions which should be ignored in wchan output. */ |
412 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
413 | |
414 | /* Linker adds these: start and end of __sched functions */ | |
415 | extern char __sched_text_start[], __sched_text_end[]; | |
416 | ||
1da177e4 LT |
417 | /* Is this address in the __sched functions? */ |
418 | extern int in_sched_functions(unsigned long addr); | |
419 | ||
420 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 421 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 422 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 423 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 424 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 425 | asmlinkage void schedule(void); |
c5491ea7 | 426 | extern void schedule_preempt_disabled(void); |
1da177e4 | 427 | |
9cff8ade N |
428 | extern long io_schedule_timeout(long timeout); |
429 | ||
430 | static inline void io_schedule(void) | |
431 | { | |
432 | io_schedule_timeout(MAX_SCHEDULE_TIMEOUT); | |
433 | } | |
434 | ||
ab516013 | 435 | struct nsproxy; |
acce292c | 436 | struct user_namespace; |
1da177e4 | 437 | |
efc1a3b1 DH |
438 | #ifdef CONFIG_MMU |
439 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
440 | extern unsigned long |
441 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
442 | unsigned long, unsigned long); | |
443 | extern unsigned long | |
444 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
445 | unsigned long len, unsigned long pgoff, | |
446 | unsigned long flags); | |
efc1a3b1 DH |
447 | #else |
448 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
449 | #endif | |
1da177e4 | 450 | |
d049f74f KC |
451 | #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ |
452 | #define SUID_DUMP_USER 1 /* Dump as user of process */ | |
453 | #define SUID_DUMP_ROOT 2 /* Dump as root */ | |
454 | ||
6c5d5238 | 455 | /* mm flags */ |
f8af4da3 | 456 | |
7288e118 | 457 | /* for SUID_DUMP_* above */ |
3cb4a0bb | 458 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 459 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb | 460 | |
942be387 ON |
461 | extern void set_dumpable(struct mm_struct *mm, int value); |
462 | /* | |
463 | * This returns the actual value of the suid_dumpable flag. For things | |
464 | * that are using this for checking for privilege transitions, it must | |
465 | * test against SUID_DUMP_USER rather than treating it as a boolean | |
466 | * value. | |
467 | */ | |
468 | static inline int __get_dumpable(unsigned long mm_flags) | |
469 | { | |
470 | return mm_flags & MMF_DUMPABLE_MASK; | |
471 | } | |
472 | ||
473 | static inline int get_dumpable(struct mm_struct *mm) | |
474 | { | |
475 | return __get_dumpable(mm->flags); | |
476 | } | |
477 | ||
3cb4a0bb KH |
478 | /* coredump filter bits */ |
479 | #define MMF_DUMP_ANON_PRIVATE 2 | |
480 | #define MMF_DUMP_ANON_SHARED 3 | |
481 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
482 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 483 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
484 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
485 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 486 | |
3cb4a0bb | 487 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 488 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
489 | #define MMF_DUMP_FILTER_MASK \ |
490 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
491 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 492 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
493 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
494 | ||
495 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
496 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
497 | #else | |
498 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
499 | #endif | |
f8af4da3 HD |
500 | /* leave room for more dump flags */ |
501 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 502 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 503 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 504 | |
9f68f672 ON |
505 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
506 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 507 | |
f8af4da3 | 508 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 509 | |
1da177e4 LT |
510 | struct sighand_struct { |
511 | atomic_t count; | |
512 | struct k_sigaction action[_NSIG]; | |
513 | spinlock_t siglock; | |
b8fceee1 | 514 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
515 | }; |
516 | ||
0e464814 | 517 | struct pacct_struct { |
f6ec29a4 KK |
518 | int ac_flag; |
519 | long ac_exitcode; | |
0e464814 | 520 | unsigned long ac_mem; |
77787bfb KK |
521 | cputime_t ac_utime, ac_stime; |
522 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
523 | }; |
524 | ||
42c4ab41 SG |
525 | struct cpu_itimer { |
526 | cputime_t expires; | |
527 | cputime_t incr; | |
8356b5f9 SG |
528 | u32 error; |
529 | u32 incr_error; | |
42c4ab41 SG |
530 | }; |
531 | ||
d37f761d FW |
532 | /** |
533 | * struct cputime - snaphsot of system and user cputime | |
534 | * @utime: time spent in user mode | |
535 | * @stime: time spent in system mode | |
536 | * | |
537 | * Gathers a generic snapshot of user and system time. | |
538 | */ | |
539 | struct cputime { | |
540 | cputime_t utime; | |
541 | cputime_t stime; | |
542 | }; | |
543 | ||
f06febc9 FM |
544 | /** |
545 | * struct task_cputime - collected CPU time counts | |
546 | * @utime: time spent in user mode, in &cputime_t units | |
547 | * @stime: time spent in kernel mode, in &cputime_t units | |
548 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 549 | * |
d37f761d FW |
550 | * This is an extension of struct cputime that includes the total runtime |
551 | * spent by the task from the scheduler point of view. | |
552 | * | |
553 | * As a result, this structure groups together three kinds of CPU time | |
554 | * that are tracked for threads and thread groups. Most things considering | |
f06febc9 FM |
555 | * CPU time want to group these counts together and treat all three |
556 | * of them in parallel. | |
557 | */ | |
558 | struct task_cputime { | |
559 | cputime_t utime; | |
560 | cputime_t stime; | |
561 | unsigned long long sum_exec_runtime; | |
562 | }; | |
563 | /* Alternate field names when used to cache expirations. */ | |
564 | #define prof_exp stime | |
565 | #define virt_exp utime | |
566 | #define sched_exp sum_exec_runtime | |
567 | ||
4cd4c1b4 PZ |
568 | #define INIT_CPUTIME \ |
569 | (struct task_cputime) { \ | |
64861634 MS |
570 | .utime = 0, \ |
571 | .stime = 0, \ | |
4cd4c1b4 PZ |
572 | .sum_exec_runtime = 0, \ |
573 | } | |
574 | ||
971e8a98 JL |
575 | /* |
576 | * This is the atomic variant of task_cputime, which can be used for | |
577 | * storing and updating task_cputime statistics without locking. | |
578 | */ | |
579 | struct task_cputime_atomic { | |
580 | atomic64_t utime; | |
581 | atomic64_t stime; | |
582 | atomic64_t sum_exec_runtime; | |
583 | }; | |
584 | ||
585 | #define INIT_CPUTIME_ATOMIC \ | |
586 | (struct task_cputime_atomic) { \ | |
587 | .utime = ATOMIC64_INIT(0), \ | |
588 | .stime = ATOMIC64_INIT(0), \ | |
589 | .sum_exec_runtime = ATOMIC64_INIT(0), \ | |
590 | } | |
591 | ||
a233f112 PZ |
592 | #ifdef CONFIG_PREEMPT_COUNT |
593 | #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED) | |
594 | #else | |
595 | #define PREEMPT_DISABLED PREEMPT_ENABLED | |
596 | #endif | |
597 | ||
c99e6efe PZ |
598 | /* |
599 | * Disable preemption until the scheduler is running. | |
600 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
601 | * |
602 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
603 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 604 | */ |
a233f112 | 605 | #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE) |
c99e6efe | 606 | |
f06febc9 | 607 | /** |
4cd4c1b4 | 608 | * struct thread_group_cputimer - thread group interval timer counts |
920ce39f | 609 | * @cputime_atomic: atomic thread group interval timers. |
4cd4c1b4 PZ |
610 | * @running: non-zero when there are timers running and |
611 | * @cputime receives updates. | |
f06febc9 FM |
612 | * |
613 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 614 | * used for thread group CPU timer calculations. |
f06febc9 | 615 | */ |
4cd4c1b4 | 616 | struct thread_group_cputimer { |
71107445 | 617 | struct task_cputime_atomic cputime_atomic; |
4cd4c1b4 | 618 | int running; |
f06febc9 | 619 | }; |
f06febc9 | 620 | |
4714d1d3 | 621 | #include <linux/rwsem.h> |
5091faa4 MG |
622 | struct autogroup; |
623 | ||
1da177e4 | 624 | /* |
e815f0a8 | 625 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
626 | * locking, because a shared signal_struct always |
627 | * implies a shared sighand_struct, so locking | |
628 | * sighand_struct is always a proper superset of | |
629 | * the locking of signal_struct. | |
630 | */ | |
631 | struct signal_struct { | |
ea6d290c | 632 | atomic_t sigcnt; |
1da177e4 | 633 | atomic_t live; |
b3ac022c | 634 | int nr_threads; |
0c740d0a | 635 | struct list_head thread_head; |
1da177e4 LT |
636 | |
637 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
638 | ||
639 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 640 | struct task_struct *curr_target; |
1da177e4 LT |
641 | |
642 | /* shared signal handling: */ | |
643 | struct sigpending shared_pending; | |
644 | ||
645 | /* thread group exit support */ | |
646 | int group_exit_code; | |
647 | /* overloaded: | |
648 | * - notify group_exit_task when ->count is equal to notify_count | |
649 | * - everyone except group_exit_task is stopped during signal delivery | |
650 | * of fatal signals, group_exit_task processes the signal. | |
651 | */ | |
1da177e4 | 652 | int notify_count; |
07dd20e0 | 653 | struct task_struct *group_exit_task; |
1da177e4 LT |
654 | |
655 | /* thread group stop support, overloads group_exit_code too */ | |
656 | int group_stop_count; | |
657 | unsigned int flags; /* see SIGNAL_* flags below */ | |
658 | ||
ebec18a6 LP |
659 | /* |
660 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
661 | * manager, to re-parent orphan (double-forking) child processes | |
662 | * to this process instead of 'init'. The service manager is | |
663 | * able to receive SIGCHLD signals and is able to investigate | |
664 | * the process until it calls wait(). All children of this | |
665 | * process will inherit a flag if they should look for a | |
666 | * child_subreaper process at exit. | |
667 | */ | |
668 | unsigned int is_child_subreaper:1; | |
669 | unsigned int has_child_subreaper:1; | |
670 | ||
1da177e4 | 671 | /* POSIX.1b Interval Timers */ |
5ed67f05 PE |
672 | int posix_timer_id; |
673 | struct list_head posix_timers; | |
1da177e4 LT |
674 | |
675 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 676 | struct hrtimer real_timer; |
fea9d175 | 677 | struct pid *leader_pid; |
2ff678b8 | 678 | ktime_t it_real_incr; |
1da177e4 | 679 | |
42c4ab41 SG |
680 | /* |
681 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
682 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
683 | * values are defined to 0 and 1 respectively | |
684 | */ | |
685 | struct cpu_itimer it[2]; | |
1da177e4 | 686 | |
f06febc9 | 687 | /* |
4cd4c1b4 PZ |
688 | * Thread group totals for process CPU timers. |
689 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 690 | */ |
4cd4c1b4 | 691 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
692 | |
693 | /* Earliest-expiration cache. */ | |
694 | struct task_cputime cputime_expires; | |
695 | ||
696 | struct list_head cpu_timers[3]; | |
697 | ||
ab521dc0 | 698 | struct pid *tty_old_pgrp; |
1ec320af | 699 | |
1da177e4 LT |
700 | /* boolean value for session group leader */ |
701 | int leader; | |
702 | ||
703 | struct tty_struct *tty; /* NULL if no tty */ | |
704 | ||
5091faa4 MG |
705 | #ifdef CONFIG_SCHED_AUTOGROUP |
706 | struct autogroup *autogroup; | |
707 | #endif | |
1da177e4 LT |
708 | /* |
709 | * Cumulative resource counters for dead threads in the group, | |
710 | * and for reaped dead child processes forked by this group. | |
711 | * Live threads maintain their own counters and add to these | |
712 | * in __exit_signal, except for the group leader. | |
713 | */ | |
e78c3496 | 714 | seqlock_t stats_lock; |
32bd671d | 715 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
716 | cputime_t gtime; |
717 | cputime_t cgtime; | |
9fbc42ea | 718 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 719 | struct cputime prev_cputime; |
0cf55e1e | 720 | #endif |
1da177e4 LT |
721 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
722 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 723 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 724 | unsigned long maxrss, cmaxrss; |
940389b8 | 725 | struct task_io_accounting ioac; |
1da177e4 | 726 | |
32bd671d PZ |
727 | /* |
728 | * Cumulative ns of schedule CPU time fo dead threads in the | |
729 | * group, not including a zombie group leader, (This only differs | |
730 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
731 | * other than jiffies.) | |
732 | */ | |
733 | unsigned long long sum_sched_runtime; | |
734 | ||
1da177e4 LT |
735 | /* |
736 | * We don't bother to synchronize most readers of this at all, | |
737 | * because there is no reader checking a limit that actually needs | |
738 | * to get both rlim_cur and rlim_max atomically, and either one | |
739 | * alone is a single word that can safely be read normally. | |
740 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
741 | * protect this instead of the siglock, because they really | |
742 | * have no need to disable irqs. | |
743 | */ | |
744 | struct rlimit rlim[RLIM_NLIMITS]; | |
745 | ||
0e464814 KK |
746 | #ifdef CONFIG_BSD_PROCESS_ACCT |
747 | struct pacct_struct pacct; /* per-process accounting information */ | |
748 | #endif | |
ad4ecbcb | 749 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
750 | struct taskstats *stats; |
751 | #endif | |
522ed776 MT |
752 | #ifdef CONFIG_AUDIT |
753 | unsigned audit_tty; | |
46e959ea | 754 | unsigned audit_tty_log_passwd; |
522ed776 MT |
755 | struct tty_audit_buf *tty_audit_buf; |
756 | #endif | |
4714d1d3 BB |
757 | #ifdef CONFIG_CGROUPS |
758 | /* | |
77e4ef99 TH |
759 | * group_rwsem prevents new tasks from entering the threadgroup and |
760 | * member tasks from exiting,a more specifically, setting of | |
761 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
762 | * using threadgroup_change_begin/end(). Users which require | |
763 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
764 | * which also takes care of exec path. Currently, cgroup is the | |
765 | * only user. | |
4714d1d3 | 766 | */ |
257058ae | 767 | struct rw_semaphore group_rwsem; |
4714d1d3 | 768 | #endif |
28b83c51 | 769 | |
e1e12d2f | 770 | oom_flags_t oom_flags; |
a9c58b90 DR |
771 | short oom_score_adj; /* OOM kill score adjustment */ |
772 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
773 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
774 | |
775 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
776 | * credential calculations | |
777 | * (notably. ptrace) */ | |
1da177e4 LT |
778 | }; |
779 | ||
780 | /* | |
781 | * Bits in flags field of signal_struct. | |
782 | */ | |
783 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
784 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
785 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
403bad72 | 786 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ |
e4420551 ON |
787 | /* |
788 | * Pending notifications to parent. | |
789 | */ | |
790 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
791 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
792 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 793 | |
fae5fa44 ON |
794 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
795 | ||
ed5d2cac ON |
796 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
797 | static inline int signal_group_exit(const struct signal_struct *sig) | |
798 | { | |
799 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
800 | (sig->group_exit_task != NULL); | |
801 | } | |
802 | ||
1da177e4 LT |
803 | /* |
804 | * Some day this will be a full-fledged user tracking system.. | |
805 | */ | |
806 | struct user_struct { | |
807 | atomic_t __count; /* reference count */ | |
808 | atomic_t processes; /* How many processes does this user have? */ | |
1da177e4 | 809 | atomic_t sigpending; /* How many pending signals does this user have? */ |
2d9048e2 | 810 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
811 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
812 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
813 | #endif | |
4afeff85 EP |
814 | #ifdef CONFIG_FANOTIFY |
815 | atomic_t fanotify_listeners; | |
816 | #endif | |
7ef9964e | 817 | #ifdef CONFIG_EPOLL |
52bd19f7 | 818 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 819 | #endif |
970a8645 | 820 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
821 | /* protected by mq_lock */ |
822 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 823 | #endif |
1da177e4 LT |
824 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
825 | ||
826 | #ifdef CONFIG_KEYS | |
827 | struct key *uid_keyring; /* UID specific keyring */ | |
828 | struct key *session_keyring; /* UID's default session keyring */ | |
829 | #endif | |
830 | ||
831 | /* Hash table maintenance information */ | |
735de223 | 832 | struct hlist_node uidhash_node; |
7b44ab97 | 833 | kuid_t uid; |
24e377a8 | 834 | |
cdd6c482 | 835 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
836 | atomic_long_t locked_vm; |
837 | #endif | |
1da177e4 LT |
838 | }; |
839 | ||
eb41d946 | 840 | extern int uids_sysfs_init(void); |
5cb350ba | 841 | |
7b44ab97 | 842 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
843 | |
844 | extern struct user_struct root_user; | |
845 | #define INIT_USER (&root_user) | |
846 | ||
b6dff3ec | 847 | |
1da177e4 LT |
848 | struct backing_dev_info; |
849 | struct reclaim_state; | |
850 | ||
52f17b6c | 851 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
852 | struct sched_info { |
853 | /* cumulative counters */ | |
2d72376b | 854 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 855 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
856 | |
857 | /* timestamps */ | |
172ba844 BS |
858 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
859 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 860 | }; |
52f17b6c | 861 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 862 | |
ca74e92b SN |
863 | #ifdef CONFIG_TASK_DELAY_ACCT |
864 | struct task_delay_info { | |
865 | spinlock_t lock; | |
866 | unsigned int flags; /* Private per-task flags */ | |
867 | ||
868 | /* For each stat XXX, add following, aligned appropriately | |
869 | * | |
870 | * struct timespec XXX_start, XXX_end; | |
871 | * u64 XXX_delay; | |
872 | * u32 XXX_count; | |
873 | * | |
874 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
875 | * single lock above (split into XXX_lock if contention is an issue). | |
876 | */ | |
0ff92245 SN |
877 | |
878 | /* | |
879 | * XXX_count is incremented on every XXX operation, the delay | |
880 | * associated with the operation is added to XXX_delay. | |
881 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
882 | */ | |
9667a23d | 883 | u64 blkio_start; /* Shared by blkio, swapin */ |
0ff92245 SN |
884 | u64 blkio_delay; /* wait for sync block io completion */ |
885 | u64 swapin_delay; /* wait for swapin block io completion */ | |
886 | u32 blkio_count; /* total count of the number of sync block */ | |
887 | /* io operations performed */ | |
888 | u32 swapin_count; /* total count of the number of swapin block */ | |
889 | /* io operations performed */ | |
873b4771 | 890 | |
9667a23d | 891 | u64 freepages_start; |
873b4771 KK |
892 | u64 freepages_delay; /* wait for memory reclaim */ |
893 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 894 | }; |
52f17b6c CS |
895 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
896 | ||
897 | static inline int sched_info_on(void) | |
898 | { | |
899 | #ifdef CONFIG_SCHEDSTATS | |
900 | return 1; | |
901 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
902 | extern int delayacct_on; | |
903 | return delayacct_on; | |
904 | #else | |
905 | return 0; | |
ca74e92b | 906 | #endif |
52f17b6c | 907 | } |
ca74e92b | 908 | |
d15bcfdb IM |
909 | enum cpu_idle_type { |
910 | CPU_IDLE, | |
911 | CPU_NOT_IDLE, | |
912 | CPU_NEWLY_IDLE, | |
913 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
914 | }; |
915 | ||
1399fa78 | 916 | /* |
ca8ce3d0 | 917 | * Increase resolution of cpu_capacity calculations |
1399fa78 | 918 | */ |
ca8ce3d0 NP |
919 | #define SCHED_CAPACITY_SHIFT 10 |
920 | #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
1da177e4 | 921 | |
76751049 PZ |
922 | /* |
923 | * Wake-queues are lists of tasks with a pending wakeup, whose | |
924 | * callers have already marked the task as woken internally, | |
925 | * and can thus carry on. A common use case is being able to | |
926 | * do the wakeups once the corresponding user lock as been | |
927 | * released. | |
928 | * | |
929 | * We hold reference to each task in the list across the wakeup, | |
930 | * thus guaranteeing that the memory is still valid by the time | |
931 | * the actual wakeups are performed in wake_up_q(). | |
932 | * | |
933 | * One per task suffices, because there's never a need for a task to be | |
934 | * in two wake queues simultaneously; it is forbidden to abandon a task | |
935 | * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is | |
936 | * already in a wake queue, the wakeup will happen soon and the second | |
937 | * waker can just skip it. | |
938 | * | |
939 | * The WAKE_Q macro declares and initializes the list head. | |
940 | * wake_up_q() does NOT reinitialize the list; it's expected to be | |
941 | * called near the end of a function, where the fact that the queue is | |
942 | * not used again will be easy to see by inspection. | |
943 | * | |
944 | * Note that this can cause spurious wakeups. schedule() callers | |
945 | * must ensure the call is done inside a loop, confirming that the | |
946 | * wakeup condition has in fact occurred. | |
947 | */ | |
948 | struct wake_q_node { | |
949 | struct wake_q_node *next; | |
950 | }; | |
951 | ||
952 | struct wake_q_head { | |
953 | struct wake_q_node *first; | |
954 | struct wake_q_node **lastp; | |
955 | }; | |
956 | ||
957 | #define WAKE_Q_TAIL ((struct wake_q_node *) 0x01) | |
958 | ||
959 | #define WAKE_Q(name) \ | |
960 | struct wake_q_head name = { WAKE_Q_TAIL, &name.first } | |
961 | ||
962 | extern void wake_q_add(struct wake_q_head *head, | |
963 | struct task_struct *task); | |
964 | extern void wake_up_q(struct wake_q_head *head); | |
965 | ||
1399fa78 NR |
966 | /* |
967 | * sched-domains (multiprocessor balancing) declarations: | |
968 | */ | |
2dd73a4f | 969 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
970 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
971 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
972 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
973 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 974 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 975 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
5d4dfddd | 976 | #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */ |
d77b3ed5 | 977 | #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ |
b5d978e0 PZ |
978 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
979 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 980 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 981 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 982 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
3a7053b3 | 983 | #define SD_NUMA 0x4000 /* cross-node balancing */ |
5c45bf27 | 984 | |
143e1e28 | 985 | #ifdef CONFIG_SCHED_SMT |
b6220ad6 | 986 | static inline int cpu_smt_flags(void) |
143e1e28 | 987 | { |
5d4dfddd | 988 | return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; |
143e1e28 VG |
989 | } |
990 | #endif | |
991 | ||
992 | #ifdef CONFIG_SCHED_MC | |
b6220ad6 | 993 | static inline int cpu_core_flags(void) |
143e1e28 VG |
994 | { |
995 | return SD_SHARE_PKG_RESOURCES; | |
996 | } | |
997 | #endif | |
998 | ||
999 | #ifdef CONFIG_NUMA | |
b6220ad6 | 1000 | static inline int cpu_numa_flags(void) |
143e1e28 VG |
1001 | { |
1002 | return SD_NUMA; | |
1003 | } | |
1004 | #endif | |
532cb4c4 | 1005 | |
1d3504fc HS |
1006 | struct sched_domain_attr { |
1007 | int relax_domain_level; | |
1008 | }; | |
1009 | ||
1010 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
1011 | .relax_domain_level = -1, \ | |
1012 | } | |
1013 | ||
60495e77 PZ |
1014 | extern int sched_domain_level_max; |
1015 | ||
5e6521ea LZ |
1016 | struct sched_group; |
1017 | ||
1da177e4 LT |
1018 | struct sched_domain { |
1019 | /* These fields must be setup */ | |
1020 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 1021 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 1022 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
1023 | unsigned long min_interval; /* Minimum balance interval ms */ |
1024 | unsigned long max_interval; /* Maximum balance interval ms */ | |
1025 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
1026 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 1027 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
1028 | unsigned int busy_idx; |
1029 | unsigned int idle_idx; | |
1030 | unsigned int newidle_idx; | |
1031 | unsigned int wake_idx; | |
147cbb4b | 1032 | unsigned int forkexec_idx; |
a52bfd73 | 1033 | unsigned int smt_gain; |
25f55d9d VG |
1034 | |
1035 | int nohz_idle; /* NOHZ IDLE status */ | |
1da177e4 | 1036 | int flags; /* See SD_* */ |
60495e77 | 1037 | int level; |
1da177e4 LT |
1038 | |
1039 | /* Runtime fields. */ | |
1040 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
1041 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
1042 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
1043 | ||
f48627e6 | 1044 | /* idle_balance() stats */ |
9bd721c5 | 1045 | u64 max_newidle_lb_cost; |
f48627e6 | 1046 | unsigned long next_decay_max_lb_cost; |
2398f2c6 | 1047 | |
1da177e4 LT |
1048 | #ifdef CONFIG_SCHEDSTATS |
1049 | /* load_balance() stats */ | |
480b9434 KC |
1050 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
1051 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
1052 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
1053 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
1054 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
1055 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
1056 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
1057 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
1058 | |
1059 | /* Active load balancing */ | |
480b9434 KC |
1060 | unsigned int alb_count; |
1061 | unsigned int alb_failed; | |
1062 | unsigned int alb_pushed; | |
1da177e4 | 1063 | |
68767a0a | 1064 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
1065 | unsigned int sbe_count; |
1066 | unsigned int sbe_balanced; | |
1067 | unsigned int sbe_pushed; | |
1da177e4 | 1068 | |
68767a0a | 1069 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
1070 | unsigned int sbf_count; |
1071 | unsigned int sbf_balanced; | |
1072 | unsigned int sbf_pushed; | |
68767a0a | 1073 | |
1da177e4 | 1074 | /* try_to_wake_up() stats */ |
480b9434 KC |
1075 | unsigned int ttwu_wake_remote; |
1076 | unsigned int ttwu_move_affine; | |
1077 | unsigned int ttwu_move_balance; | |
1da177e4 | 1078 | #endif |
a5d8c348 IM |
1079 | #ifdef CONFIG_SCHED_DEBUG |
1080 | char *name; | |
1081 | #endif | |
dce840a0 PZ |
1082 | union { |
1083 | void *private; /* used during construction */ | |
1084 | struct rcu_head rcu; /* used during destruction */ | |
1085 | }; | |
6c99e9ad | 1086 | |
669c55e9 | 1087 | unsigned int span_weight; |
4200efd9 IM |
1088 | /* |
1089 | * Span of all CPUs in this domain. | |
1090 | * | |
1091 | * NOTE: this field is variable length. (Allocated dynamically | |
1092 | * by attaching extra space to the end of the structure, | |
1093 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
1094 | */ |
1095 | unsigned long span[0]; | |
1da177e4 LT |
1096 | }; |
1097 | ||
758b2cdc RR |
1098 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
1099 | { | |
6c99e9ad | 1100 | return to_cpumask(sd->span); |
758b2cdc RR |
1101 | } |
1102 | ||
acc3f5d7 | 1103 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 1104 | struct sched_domain_attr *dattr_new); |
029190c5 | 1105 | |
acc3f5d7 RR |
1106 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
1107 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1108 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1109 | ||
39be3501 PZ |
1110 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1111 | ||
143e1e28 | 1112 | typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); |
b6220ad6 | 1113 | typedef int (*sched_domain_flags_f)(void); |
143e1e28 VG |
1114 | |
1115 | #define SDTL_OVERLAP 0x01 | |
1116 | ||
1117 | struct sd_data { | |
1118 | struct sched_domain **__percpu sd; | |
1119 | struct sched_group **__percpu sg; | |
63b2ca30 | 1120 | struct sched_group_capacity **__percpu sgc; |
143e1e28 VG |
1121 | }; |
1122 | ||
1123 | struct sched_domain_topology_level { | |
1124 | sched_domain_mask_f mask; | |
1125 | sched_domain_flags_f sd_flags; | |
1126 | int flags; | |
1127 | int numa_level; | |
1128 | struct sd_data data; | |
1129 | #ifdef CONFIG_SCHED_DEBUG | |
1130 | char *name; | |
1131 | #endif | |
1132 | }; | |
1133 | ||
1134 | extern struct sched_domain_topology_level *sched_domain_topology; | |
1135 | ||
1136 | extern void set_sched_topology(struct sched_domain_topology_level *tl); | |
f6be8af1 | 1137 | extern void wake_up_if_idle(int cpu); |
143e1e28 VG |
1138 | |
1139 | #ifdef CONFIG_SCHED_DEBUG | |
1140 | # define SD_INIT_NAME(type) .name = #type | |
1141 | #else | |
1142 | # define SD_INIT_NAME(type) | |
1143 | #endif | |
1144 | ||
1b427c15 | 1145 | #else /* CONFIG_SMP */ |
1da177e4 | 1146 | |
1b427c15 | 1147 | struct sched_domain_attr; |
d02c7a8c | 1148 | |
1b427c15 | 1149 | static inline void |
acc3f5d7 | 1150 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1151 | struct sched_domain_attr *dattr_new) |
1152 | { | |
d02c7a8c | 1153 | } |
39be3501 PZ |
1154 | |
1155 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1156 | { | |
1157 | return true; | |
1158 | } | |
1159 | ||
1b427c15 | 1160 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1161 | |
47fe38fc | 1162 | |
1da177e4 | 1163 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1164 | |
1da177e4 | 1165 | |
383f2835 | 1166 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1167 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
1168 | #else |
1169 | static inline void prefetch_stack(struct task_struct *t) { } | |
1170 | #endif | |
1da177e4 LT |
1171 | |
1172 | struct audit_context; /* See audit.c */ | |
1173 | struct mempolicy; | |
b92ce558 | 1174 | struct pipe_inode_info; |
4865ecf1 | 1175 | struct uts_namespace; |
1da177e4 | 1176 | |
20b8a59f | 1177 | struct load_weight { |
9dbdb155 PZ |
1178 | unsigned long weight; |
1179 | u32 inv_weight; | |
20b8a59f IM |
1180 | }; |
1181 | ||
9d85f21c | 1182 | struct sched_avg { |
36ee28e4 VG |
1183 | u64 last_runnable_update; |
1184 | s64 decay_count; | |
1185 | /* | |
1186 | * utilization_avg_contrib describes the amount of time that a | |
1187 | * sched_entity is running on a CPU. It is based on running_avg_sum | |
1188 | * and is scaled in the range [0..SCHED_LOAD_SCALE]. | |
1189 | * load_avg_contrib described the amount of time that a sched_entity | |
1190 | * is runnable on a rq. It is based on both runnable_avg_sum and the | |
1191 | * weight of the task. | |
1192 | */ | |
1193 | unsigned long load_avg_contrib, utilization_avg_contrib; | |
9d85f21c PT |
1194 | /* |
1195 | * These sums represent an infinite geometric series and so are bound | |
239003ea | 1196 | * above by 1024/(1-y). Thus we only need a u32 to store them for all |
9d85f21c | 1197 | * choices of y < 1-2^(-32)*1024. |
36ee28e4 VG |
1198 | * running_avg_sum reflects the time that the sched_entity is |
1199 | * effectively running on the CPU. | |
1200 | * runnable_avg_sum represents the amount of time a sched_entity is on | |
1201 | * a runqueue which includes the running time that is monitored by | |
1202 | * running_avg_sum. | |
9d85f21c | 1203 | */ |
36ee28e4 | 1204 | u32 runnable_avg_sum, avg_period, running_avg_sum; |
9d85f21c PT |
1205 | }; |
1206 | ||
94c18227 | 1207 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1208 | struct sched_statistics { |
20b8a59f | 1209 | u64 wait_start; |
94c18227 | 1210 | u64 wait_max; |
6d082592 AV |
1211 | u64 wait_count; |
1212 | u64 wait_sum; | |
8f0dfc34 AV |
1213 | u64 iowait_count; |
1214 | u64 iowait_sum; | |
94c18227 | 1215 | |
20b8a59f | 1216 | u64 sleep_start; |
20b8a59f | 1217 | u64 sleep_max; |
94c18227 IM |
1218 | s64 sum_sleep_runtime; |
1219 | ||
1220 | u64 block_start; | |
20b8a59f IM |
1221 | u64 block_max; |
1222 | u64 exec_max; | |
eba1ed4b | 1223 | u64 slice_max; |
cc367732 | 1224 | |
cc367732 IM |
1225 | u64 nr_migrations_cold; |
1226 | u64 nr_failed_migrations_affine; | |
1227 | u64 nr_failed_migrations_running; | |
1228 | u64 nr_failed_migrations_hot; | |
1229 | u64 nr_forced_migrations; | |
cc367732 IM |
1230 | |
1231 | u64 nr_wakeups; | |
1232 | u64 nr_wakeups_sync; | |
1233 | u64 nr_wakeups_migrate; | |
1234 | u64 nr_wakeups_local; | |
1235 | u64 nr_wakeups_remote; | |
1236 | u64 nr_wakeups_affine; | |
1237 | u64 nr_wakeups_affine_attempts; | |
1238 | u64 nr_wakeups_passive; | |
1239 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1240 | }; |
1241 | #endif | |
1242 | ||
1243 | struct sched_entity { | |
1244 | struct load_weight load; /* for load-balancing */ | |
1245 | struct rb_node run_node; | |
1246 | struct list_head group_node; | |
1247 | unsigned int on_rq; | |
1248 | ||
1249 | u64 exec_start; | |
1250 | u64 sum_exec_runtime; | |
1251 | u64 vruntime; | |
1252 | u64 prev_sum_exec_runtime; | |
1253 | ||
41acab88 LDM |
1254 | u64 nr_migrations; |
1255 | ||
41acab88 LDM |
1256 | #ifdef CONFIG_SCHEDSTATS |
1257 | struct sched_statistics statistics; | |
94c18227 IM |
1258 | #endif |
1259 | ||
20b8a59f | 1260 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 1261 | int depth; |
20b8a59f IM |
1262 | struct sched_entity *parent; |
1263 | /* rq on which this entity is (to be) queued: */ | |
1264 | struct cfs_rq *cfs_rq; | |
1265 | /* rq "owned" by this entity/group: */ | |
1266 | struct cfs_rq *my_q; | |
1267 | #endif | |
8bd75c77 | 1268 | |
141965c7 | 1269 | #ifdef CONFIG_SMP |
f4e26b12 | 1270 | /* Per-entity load-tracking */ |
9d85f21c PT |
1271 | struct sched_avg avg; |
1272 | #endif | |
20b8a59f | 1273 | }; |
70b97a7f | 1274 | |
fa717060 PZ |
1275 | struct sched_rt_entity { |
1276 | struct list_head run_list; | |
78f2c7db | 1277 | unsigned long timeout; |
57d2aa00 | 1278 | unsigned long watchdog_stamp; |
bee367ed | 1279 | unsigned int time_slice; |
6f505b16 | 1280 | |
58d6c2d7 | 1281 | struct sched_rt_entity *back; |
052f1dc7 | 1282 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1283 | struct sched_rt_entity *parent; |
1284 | /* rq on which this entity is (to be) queued: */ | |
1285 | struct rt_rq *rt_rq; | |
1286 | /* rq "owned" by this entity/group: */ | |
1287 | struct rt_rq *my_q; | |
1288 | #endif | |
fa717060 PZ |
1289 | }; |
1290 | ||
aab03e05 DF |
1291 | struct sched_dl_entity { |
1292 | struct rb_node rb_node; | |
1293 | ||
1294 | /* | |
1295 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 1296 | * during sched_setattr(), they will remain the same until |
1297 | * the next sched_setattr(). | |
aab03e05 DF |
1298 | */ |
1299 | u64 dl_runtime; /* maximum runtime for each instance */ | |
1300 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 1301 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 1302 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
1303 | |
1304 | /* | |
1305 | * Actual scheduling parameters. Initialized with the values above, | |
1306 | * they are continously updated during task execution. Note that | |
1307 | * the remaining runtime could be < 0 in case we are in overrun. | |
1308 | */ | |
1309 | s64 runtime; /* remaining runtime for this instance */ | |
1310 | u64 deadline; /* absolute deadline for this instance */ | |
1311 | unsigned int flags; /* specifying the scheduler behaviour */ | |
1312 | ||
1313 | /* | |
1314 | * Some bool flags: | |
1315 | * | |
1316 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
1317 | * task has to wait for a replenishment to be performed at the | |
1318 | * next firing of dl_timer. | |
1319 | * | |
1320 | * @dl_new tells if a new instance arrived. If so we must | |
1321 | * start executing it with full runtime and reset its absolute | |
1322 | * deadline; | |
2d3d891d DF |
1323 | * |
1324 | * @dl_boosted tells if we are boosted due to DI. If so we are | |
1325 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
1326 | * exit the critical section); |
1327 | * | |
1328 | * @dl_yielded tells if task gave up the cpu before consuming | |
1329 | * all its available runtime during the last job. | |
aab03e05 | 1330 | */ |
5bfd126e | 1331 | int dl_throttled, dl_new, dl_boosted, dl_yielded; |
aab03e05 DF |
1332 | |
1333 | /* | |
1334 | * Bandwidth enforcement timer. Each -deadline task has its | |
1335 | * own bandwidth to be enforced, thus we need one timer per task. | |
1336 | */ | |
1337 | struct hrtimer dl_timer; | |
1338 | }; | |
8bd75c77 | 1339 | |
1d082fd0 PM |
1340 | union rcu_special { |
1341 | struct { | |
1342 | bool blocked; | |
1343 | bool need_qs; | |
1344 | } b; | |
1345 | short s; | |
1346 | }; | |
86848966 PM |
1347 | struct rcu_node; |
1348 | ||
8dc85d54 PZ |
1349 | enum perf_event_task_context { |
1350 | perf_invalid_context = -1, | |
1351 | perf_hw_context = 0, | |
89a1e187 | 1352 | perf_sw_context, |
8dc85d54 PZ |
1353 | perf_nr_task_contexts, |
1354 | }; | |
1355 | ||
1da177e4 LT |
1356 | struct task_struct { |
1357 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1358 | void *stack; |
1da177e4 | 1359 | atomic_t usage; |
97dc32cd WC |
1360 | unsigned int flags; /* per process flags, defined below */ |
1361 | unsigned int ptrace; | |
1da177e4 | 1362 | |
2dd73a4f | 1363 | #ifdef CONFIG_SMP |
fa14ff4a | 1364 | struct llist_node wake_entry; |
3ca7a440 | 1365 | int on_cpu; |
62470419 MW |
1366 | struct task_struct *last_wakee; |
1367 | unsigned long wakee_flips; | |
1368 | unsigned long wakee_flip_decay_ts; | |
ac66f547 PZ |
1369 | |
1370 | int wake_cpu; | |
2dd73a4f | 1371 | #endif |
fd2f4419 | 1372 | int on_rq; |
50e645a8 | 1373 | |
b29739f9 | 1374 | int prio, static_prio, normal_prio; |
c7aceaba | 1375 | unsigned int rt_priority; |
5522d5d5 | 1376 | const struct sched_class *sched_class; |
20b8a59f | 1377 | struct sched_entity se; |
fa717060 | 1378 | struct sched_rt_entity rt; |
8323f26c PZ |
1379 | #ifdef CONFIG_CGROUP_SCHED |
1380 | struct task_group *sched_task_group; | |
1381 | #endif | |
aab03e05 | 1382 | struct sched_dl_entity dl; |
1da177e4 | 1383 | |
e107be36 AK |
1384 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1385 | /* list of struct preempt_notifier: */ | |
1386 | struct hlist_head preempt_notifiers; | |
1387 | #endif | |
1388 | ||
6c5c9341 | 1389 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1390 | unsigned int btrace_seq; |
6c5c9341 | 1391 | #endif |
1da177e4 | 1392 | |
97dc32cd | 1393 | unsigned int policy; |
29baa747 | 1394 | int nr_cpus_allowed; |
1da177e4 | 1395 | cpumask_t cpus_allowed; |
1da177e4 | 1396 | |
a57eb940 | 1397 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1398 | int rcu_read_lock_nesting; |
1d082fd0 | 1399 | union rcu_special rcu_read_unlock_special; |
f41d911f | 1400 | struct list_head rcu_node_entry; |
a57eb940 | 1401 | struct rcu_node *rcu_blocked_node; |
28f6569a | 1402 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
8315f422 PM |
1403 | #ifdef CONFIG_TASKS_RCU |
1404 | unsigned long rcu_tasks_nvcsw; | |
1405 | bool rcu_tasks_holdout; | |
1406 | struct list_head rcu_tasks_holdout_list; | |
176f8f7a | 1407 | int rcu_tasks_idle_cpu; |
8315f422 | 1408 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 1409 | |
52f17b6c | 1410 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1411 | struct sched_info sched_info; |
1412 | #endif | |
1413 | ||
1414 | struct list_head tasks; | |
806c09a7 | 1415 | #ifdef CONFIG_SMP |
917b627d | 1416 | struct plist_node pushable_tasks; |
1baca4ce | 1417 | struct rb_node pushable_dl_tasks; |
806c09a7 | 1418 | #endif |
1da177e4 LT |
1419 | |
1420 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1421 | #ifdef CONFIG_COMPAT_BRK |
1422 | unsigned brk_randomized:1; | |
1423 | #endif | |
615d6e87 DB |
1424 | /* per-thread vma caching */ |
1425 | u32 vmacache_seqnum; | |
1426 | struct vm_area_struct *vmacache[VMACACHE_SIZE]; | |
34e55232 KH |
1427 | #if defined(SPLIT_RSS_COUNTING) |
1428 | struct task_rss_stat rss_stat; | |
1429 | #endif | |
1da177e4 | 1430 | /* task state */ |
97dc32cd | 1431 | int exit_state; |
1da177e4 LT |
1432 | int exit_code, exit_signal; |
1433 | int pdeath_signal; /* The signal sent when the parent dies */ | |
e7cc4173 | 1434 | unsigned long jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
1435 | |
1436 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 1437 | unsigned int personality; |
9b89f6ba | 1438 | |
f9ce1f1c KT |
1439 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1440 | * execve */ | |
8f0dfc34 AV |
1441 | unsigned in_iowait:1; |
1442 | ||
ca94c442 LP |
1443 | /* Revert to default priority/policy when forking */ |
1444 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1445 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1446 | |
6f185c29 VD |
1447 | #ifdef CONFIG_MEMCG_KMEM |
1448 | unsigned memcg_kmem_skip_account:1; | |
1449 | #endif | |
1450 | ||
1d4457f9 KC |
1451 | unsigned long atomic_flags; /* Flags needing atomic access. */ |
1452 | ||
f56141e3 AL |
1453 | struct restart_block restart_block; |
1454 | ||
1da177e4 LT |
1455 | pid_t pid; |
1456 | pid_t tgid; | |
0a425405 | 1457 | |
1314562a | 1458 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1459 | /* Canary value for the -fstack-protector gcc feature */ |
1460 | unsigned long stack_canary; | |
1314562a | 1461 | #endif |
4d1d61a6 | 1462 | /* |
1da177e4 | 1463 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1464 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1465 | * p->real_parent->pid) |
1da177e4 | 1466 | */ |
abd63bc3 KC |
1467 | struct task_struct __rcu *real_parent; /* real parent process */ |
1468 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1469 | /* |
f470021a | 1470 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1471 | */ |
1472 | struct list_head children; /* list of my children */ | |
1473 | struct list_head sibling; /* linkage in my parent's children list */ | |
1474 | struct task_struct *group_leader; /* threadgroup leader */ | |
1475 | ||
f470021a RM |
1476 | /* |
1477 | * ptraced is the list of tasks this task is using ptrace on. | |
1478 | * This includes both natural children and PTRACE_ATTACH targets. | |
1479 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1480 | */ | |
1481 | struct list_head ptraced; | |
1482 | struct list_head ptrace_entry; | |
1483 | ||
1da177e4 | 1484 | /* PID/PID hash table linkage. */ |
92476d7f | 1485 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1486 | struct list_head thread_group; |
0c740d0a | 1487 | struct list_head thread_node; |
1da177e4 LT |
1488 | |
1489 | struct completion *vfork_done; /* for vfork() */ | |
1490 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1491 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1492 | ||
c66f08be | 1493 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1494 | cputime_t gtime; |
9fbc42ea | 1495 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 1496 | struct cputime prev_cputime; |
6a61671b FW |
1497 | #endif |
1498 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | |
1499 | seqlock_t vtime_seqlock; | |
1500 | unsigned long long vtime_snap; | |
1501 | enum { | |
1502 | VTIME_SLEEPING = 0, | |
1503 | VTIME_USER, | |
1504 | VTIME_SYS, | |
1505 | } vtime_snap_whence; | |
d99ca3b9 | 1506 | #endif |
1da177e4 | 1507 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
ccbf62d8 | 1508 | u64 start_time; /* monotonic time in nsec */ |
57e0be04 | 1509 | u64 real_start_time; /* boot based time in nsec */ |
1da177e4 LT |
1510 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1511 | unsigned long min_flt, maj_flt; | |
1512 | ||
f06febc9 | 1513 | struct task_cputime cputime_expires; |
1da177e4 LT |
1514 | struct list_head cpu_timers[3]; |
1515 | ||
1516 | /* process credentials */ | |
1b0ba1c9 | 1517 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1518 | * credentials (COW) */ |
1b0ba1c9 | 1519 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1520 | * credentials (COW) */ |
36772092 PBG |
1521 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1522 | - access with [gs]et_task_comm (which lock | |
1523 | it with task_lock()) | |
221af7f8 | 1524 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1525 | /* file system info */ |
1526 | int link_count, total_link_count; | |
3d5b6fcc | 1527 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1528 | /* ipc stuff */ |
1529 | struct sysv_sem sysvsem; | |
ab602f79 | 1530 | struct sysv_shm sysvshm; |
3d5b6fcc | 1531 | #endif |
e162b39a | 1532 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1533 | /* hung task detection */ |
82a1fcb9 IM |
1534 | unsigned long last_switch_count; |
1535 | #endif | |
1da177e4 LT |
1536 | /* CPU-specific state of this task */ |
1537 | struct thread_struct thread; | |
1538 | /* filesystem information */ | |
1539 | struct fs_struct *fs; | |
1540 | /* open file information */ | |
1541 | struct files_struct *files; | |
1651e14e | 1542 | /* namespaces */ |
ab516013 | 1543 | struct nsproxy *nsproxy; |
1da177e4 LT |
1544 | /* signal handlers */ |
1545 | struct signal_struct *signal; | |
1546 | struct sighand_struct *sighand; | |
1547 | ||
1548 | sigset_t blocked, real_blocked; | |
f3de272b | 1549 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1550 | struct sigpending pending; |
1551 | ||
1552 | unsigned long sas_ss_sp; | |
1553 | size_t sas_ss_size; | |
1554 | int (*notifier)(void *priv); | |
1555 | void *notifier_data; | |
1556 | sigset_t *notifier_mask; | |
67d12145 | 1557 | struct callback_head *task_works; |
e73f8959 | 1558 | |
1da177e4 | 1559 | struct audit_context *audit_context; |
bfef93a5 | 1560 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1561 | kuid_t loginuid; |
4746ec5b | 1562 | unsigned int sessionid; |
bfef93a5 | 1563 | #endif |
932ecebb | 1564 | struct seccomp seccomp; |
1da177e4 LT |
1565 | |
1566 | /* Thread group tracking */ | |
1567 | u32 parent_exec_id; | |
1568 | u32 self_exec_id; | |
58568d2a MX |
1569 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1570 | * mempolicy */ | |
1da177e4 | 1571 | spinlock_t alloc_lock; |
1da177e4 | 1572 | |
b29739f9 | 1573 | /* Protection of the PI data structures: */ |
1d615482 | 1574 | raw_spinlock_t pi_lock; |
b29739f9 | 1575 | |
76751049 PZ |
1576 | struct wake_q_node wake_q; |
1577 | ||
23f78d4a IM |
1578 | #ifdef CONFIG_RT_MUTEXES |
1579 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
1580 | struct rb_root pi_waiters; |
1581 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
1582 | /* Deadlock detection and priority inheritance handling */ |
1583 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1584 | #endif |
1585 | ||
408894ee IM |
1586 | #ifdef CONFIG_DEBUG_MUTEXES |
1587 | /* mutex deadlock detection */ | |
1588 | struct mutex_waiter *blocked_on; | |
1589 | #endif | |
de30a2b3 IM |
1590 | #ifdef CONFIG_TRACE_IRQFLAGS |
1591 | unsigned int irq_events; | |
de30a2b3 | 1592 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1593 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1594 | unsigned int hardirq_enable_event; |
de30a2b3 | 1595 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1596 | int hardirqs_enabled; |
1597 | int hardirq_context; | |
de30a2b3 | 1598 | unsigned long softirq_disable_ip; |
de30a2b3 | 1599 | unsigned long softirq_enable_ip; |
fa1452e8 | 1600 | unsigned int softirq_disable_event; |
de30a2b3 | 1601 | unsigned int softirq_enable_event; |
fa1452e8 | 1602 | int softirqs_enabled; |
de30a2b3 IM |
1603 | int softirq_context; |
1604 | #endif | |
fbb9ce95 | 1605 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1606 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1607 | u64 curr_chain_key; |
1608 | int lockdep_depth; | |
fbb9ce95 | 1609 | unsigned int lockdep_recursion; |
c7aceaba | 1610 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1611 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1612 | #endif |
408894ee | 1613 | |
1da177e4 LT |
1614 | /* journalling filesystem info */ |
1615 | void *journal_info; | |
1616 | ||
d89d8796 | 1617 | /* stacked block device info */ |
bddd87c7 | 1618 | struct bio_list *bio_list; |
d89d8796 | 1619 | |
73c10101 JA |
1620 | #ifdef CONFIG_BLOCK |
1621 | /* stack plugging */ | |
1622 | struct blk_plug *plug; | |
1623 | #endif | |
1624 | ||
1da177e4 LT |
1625 | /* VM state */ |
1626 | struct reclaim_state *reclaim_state; | |
1627 | ||
1da177e4 LT |
1628 | struct backing_dev_info *backing_dev_info; |
1629 | ||
1630 | struct io_context *io_context; | |
1631 | ||
1632 | unsigned long ptrace_message; | |
1633 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1634 | struct task_io_accounting ioac; |
8f0ab514 | 1635 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1636 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1637 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1638 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1639 | #endif |
1640 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1641 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1642 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1643 | int cpuset_mem_spread_rotor; |
6adef3eb | 1644 | int cpuset_slab_spread_rotor; |
1da177e4 | 1645 | #endif |
ddbcc7e8 | 1646 | #ifdef CONFIG_CGROUPS |
817929ec | 1647 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1648 | struct css_set __rcu *cgroups; |
817929ec PM |
1649 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1650 | struct list_head cg_list; | |
ddbcc7e8 | 1651 | #endif |
42b2dd0a | 1652 | #ifdef CONFIG_FUTEX |
0771dfef | 1653 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1654 | #ifdef CONFIG_COMPAT |
1655 | struct compat_robust_list_head __user *compat_robust_list; | |
1656 | #endif | |
c87e2837 IM |
1657 | struct list_head pi_state_list; |
1658 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1659 | #endif |
cdd6c482 | 1660 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1661 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1662 | struct mutex perf_event_mutex; |
1663 | struct list_head perf_event_list; | |
a63eaf34 | 1664 | #endif |
8f47b187 TG |
1665 | #ifdef CONFIG_DEBUG_PREEMPT |
1666 | unsigned long preempt_disable_ip; | |
1667 | #endif | |
c7aceaba | 1668 | #ifdef CONFIG_NUMA |
58568d2a | 1669 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1670 | short il_next; |
207205a2 | 1671 | short pref_node_fork; |
42b2dd0a | 1672 | #endif |
cbee9f88 PZ |
1673 | #ifdef CONFIG_NUMA_BALANCING |
1674 | int numa_scan_seq; | |
cbee9f88 | 1675 | unsigned int numa_scan_period; |
598f0ec0 | 1676 | unsigned int numa_scan_period_max; |
de1c9ce6 | 1677 | int numa_preferred_nid; |
6b9a7460 | 1678 | unsigned long numa_migrate_retry; |
cbee9f88 | 1679 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
1680 | u64 last_task_numa_placement; |
1681 | u64 last_sum_exec_runtime; | |
cbee9f88 | 1682 | struct callback_head numa_work; |
f809ca9a | 1683 | |
8c8a743c PZ |
1684 | struct list_head numa_entry; |
1685 | struct numa_group *numa_group; | |
1686 | ||
745d6147 | 1687 | /* |
44dba3d5 IM |
1688 | * numa_faults is an array split into four regions: |
1689 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1690 | * in this precise order. | |
1691 | * | |
1692 | * faults_memory: Exponential decaying average of faults on a per-node | |
1693 | * basis. Scheduling placement decisions are made based on these | |
1694 | * counts. The values remain static for the duration of a PTE scan. | |
1695 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1696 | * hinting fault was incurred. | |
1697 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1698 | * during the current scan window. When the scan completes, the counts | |
1699 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1700 | */ |
44dba3d5 | 1701 | unsigned long *numa_faults; |
83e1d2cd | 1702 | unsigned long total_numa_faults; |
745d6147 | 1703 | |
04bb2f94 RR |
1704 | /* |
1705 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1706 | * scan window were remote/local or failed to migrate. The task scan |
1707 | * period is adapted based on the locality of the faults with different | |
1708 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1709 | */ |
074c2381 | 1710 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1711 | |
b32e86b4 | 1712 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1713 | #endif /* CONFIG_NUMA_BALANCING */ |
1714 | ||
e56d0903 | 1715 | struct rcu_head rcu; |
b92ce558 JA |
1716 | |
1717 | /* | |
1718 | * cache last used pipe for splice | |
1719 | */ | |
1720 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1721 | |
1722 | struct page_frag task_frag; | |
1723 | ||
ca74e92b SN |
1724 | #ifdef CONFIG_TASK_DELAY_ACCT |
1725 | struct task_delay_info *delays; | |
f4f154fd AM |
1726 | #endif |
1727 | #ifdef CONFIG_FAULT_INJECTION | |
1728 | int make_it_fail; | |
ca74e92b | 1729 | #endif |
9d823e8f WF |
1730 | /* |
1731 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1732 | * balance_dirty_pages() for some dirty throttling pause | |
1733 | */ | |
1734 | int nr_dirtied; | |
1735 | int nr_dirtied_pause; | |
83712358 | 1736 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1737 | |
9745512c AV |
1738 | #ifdef CONFIG_LATENCYTOP |
1739 | int latency_record_count; | |
1740 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1741 | #endif | |
6976675d AV |
1742 | /* |
1743 | * time slack values; these are used to round up poll() and | |
1744 | * select() etc timeout values. These are in nanoseconds. | |
1745 | */ | |
1746 | unsigned long timer_slack_ns; | |
1747 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1748 | |
0b24becc AR |
1749 | #ifdef CONFIG_KASAN |
1750 | unsigned int kasan_depth; | |
1751 | #endif | |
fb52607a | 1752 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1753 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1754 | int curr_ret_stack; |
1755 | /* Stack of return addresses for return function tracing */ | |
1756 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1757 | /* time stamp for last schedule */ |
1758 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1759 | /* |
1760 | * Number of functions that haven't been traced | |
1761 | * because of depth overrun. | |
1762 | */ | |
1763 | atomic_t trace_overrun; | |
380c4b14 FW |
1764 | /* Pause for the tracing */ |
1765 | atomic_t tracing_graph_pause; | |
f201ae23 | 1766 | #endif |
ea4e2bc4 SR |
1767 | #ifdef CONFIG_TRACING |
1768 | /* state flags for use by tracers */ | |
1769 | unsigned long trace; | |
b1cff0ad | 1770 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1771 | unsigned long trace_recursion; |
1772 | #endif /* CONFIG_TRACING */ | |
6f185c29 | 1773 | #ifdef CONFIG_MEMCG |
519e5247 | 1774 | struct memcg_oom_info { |
49426420 JW |
1775 | struct mem_cgroup *memcg; |
1776 | gfp_t gfp_mask; | |
1777 | int order; | |
519e5247 JW |
1778 | unsigned int may_oom:1; |
1779 | } memcg_oom; | |
569b846d | 1780 | #endif |
0326f5a9 SD |
1781 | #ifdef CONFIG_UPROBES |
1782 | struct uprobe_task *utask; | |
0326f5a9 | 1783 | #endif |
cafe5635 KO |
1784 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1785 | unsigned int sequential_io; | |
1786 | unsigned int sequential_io_avg; | |
1787 | #endif | |
8eb23b9f PZ |
1788 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1789 | unsigned long task_state_change; | |
1790 | #endif | |
1da177e4 LT |
1791 | }; |
1792 | ||
76e6eee0 | 1793 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1794 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1795 | |
6688cc05 PZ |
1796 | #define TNF_MIGRATED 0x01 |
1797 | #define TNF_NO_GROUP 0x02 | |
dabe1d99 | 1798 | #define TNF_SHARED 0x04 |
04bb2f94 | 1799 | #define TNF_FAULT_LOCAL 0x08 |
074c2381 | 1800 | #define TNF_MIGRATE_FAIL 0x10 |
6688cc05 | 1801 | |
cbee9f88 | 1802 | #ifdef CONFIG_NUMA_BALANCING |
6688cc05 | 1803 | extern void task_numa_fault(int last_node, int node, int pages, int flags); |
e29cf08b | 1804 | extern pid_t task_numa_group_id(struct task_struct *p); |
1a687c2e | 1805 | extern void set_numabalancing_state(bool enabled); |
82727018 | 1806 | extern void task_numa_free(struct task_struct *p); |
10f39042 RR |
1807 | extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page, |
1808 | int src_nid, int dst_cpu); | |
cbee9f88 | 1809 | #else |
ac8e895b | 1810 | static inline void task_numa_fault(int last_node, int node, int pages, |
6688cc05 | 1811 | int flags) |
cbee9f88 PZ |
1812 | { |
1813 | } | |
e29cf08b MG |
1814 | static inline pid_t task_numa_group_id(struct task_struct *p) |
1815 | { | |
1816 | return 0; | |
1817 | } | |
1a687c2e MG |
1818 | static inline void set_numabalancing_state(bool enabled) |
1819 | { | |
1820 | } | |
82727018 RR |
1821 | static inline void task_numa_free(struct task_struct *p) |
1822 | { | |
1823 | } | |
10f39042 RR |
1824 | static inline bool should_numa_migrate_memory(struct task_struct *p, |
1825 | struct page *page, int src_nid, int dst_cpu) | |
1826 | { | |
1827 | return true; | |
1828 | } | |
cbee9f88 PZ |
1829 | #endif |
1830 | ||
e868171a | 1831 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1832 | { |
1833 | return task->pids[PIDTYPE_PID].pid; | |
1834 | } | |
1835 | ||
e868171a | 1836 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1837 | { |
1838 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1839 | } | |
1840 | ||
6dda81f4 ON |
1841 | /* |
1842 | * Without tasklist or rcu lock it is not safe to dereference | |
1843 | * the result of task_pgrp/task_session even if task == current, | |
1844 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1845 | */ | |
e868171a | 1846 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1847 | { |
1848 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1849 | } | |
1850 | ||
e868171a | 1851 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1852 | { |
1853 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1854 | } | |
1855 | ||
7af57294 PE |
1856 | struct pid_namespace; |
1857 | ||
1858 | /* | |
1859 | * the helpers to get the task's different pids as they are seen | |
1860 | * from various namespaces | |
1861 | * | |
1862 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1863 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1864 | * current. | |
7af57294 PE |
1865 | * task_xid_nr_ns() : id seen from the ns specified; |
1866 | * | |
1867 | * set_task_vxid() : assigns a virtual id to a task; | |
1868 | * | |
7af57294 PE |
1869 | * see also pid_nr() etc in include/linux/pid.h |
1870 | */ | |
52ee2dfd ON |
1871 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1872 | struct pid_namespace *ns); | |
7af57294 | 1873 | |
e868171a | 1874 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1875 | { |
1876 | return tsk->pid; | |
1877 | } | |
1878 | ||
52ee2dfd ON |
1879 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1880 | struct pid_namespace *ns) | |
1881 | { | |
1882 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1883 | } | |
7af57294 PE |
1884 | |
1885 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1886 | { | |
52ee2dfd | 1887 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1888 | } |
1889 | ||
1890 | ||
e868171a | 1891 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1892 | { |
1893 | return tsk->tgid; | |
1894 | } | |
1895 | ||
2f2a3a46 | 1896 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1897 | |
1898 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1899 | { | |
1900 | return pid_vnr(task_tgid(tsk)); | |
1901 | } | |
1902 | ||
1903 | ||
80e0b6e8 | 1904 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1905 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1906 | { | |
1907 | pid_t pid = 0; | |
1908 | ||
1909 | rcu_read_lock(); | |
1910 | if (pid_alive(tsk)) | |
1911 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1912 | rcu_read_unlock(); | |
1913 | ||
1914 | return pid; | |
1915 | } | |
1916 | ||
1917 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1918 | { | |
1919 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1920 | } | |
1921 | ||
52ee2dfd ON |
1922 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1923 | struct pid_namespace *ns) | |
7af57294 | 1924 | { |
52ee2dfd | 1925 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1926 | } |
1927 | ||
7af57294 PE |
1928 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1929 | { | |
52ee2dfd | 1930 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1931 | } |
1932 | ||
1933 | ||
52ee2dfd ON |
1934 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1935 | struct pid_namespace *ns) | |
7af57294 | 1936 | { |
52ee2dfd | 1937 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1938 | } |
1939 | ||
7af57294 PE |
1940 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1941 | { | |
52ee2dfd | 1942 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1943 | } |
1944 | ||
1b0f7ffd ON |
1945 | /* obsolete, do not use */ |
1946 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1947 | { | |
1948 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1949 | } | |
7af57294 | 1950 | |
1da177e4 LT |
1951 | /** |
1952 | * pid_alive - check that a task structure is not stale | |
1953 | * @p: Task structure to be checked. | |
1954 | * | |
1955 | * Test if a process is not yet dead (at most zombie state) | |
1956 | * If pid_alive fails, then pointers within the task structure | |
1957 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1958 | * |
1959 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1960 | */ |
ad36d282 | 1961 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 1962 | { |
92476d7f | 1963 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1964 | } |
1965 | ||
f400e198 | 1966 | /** |
b460cbc5 | 1967 | * is_global_init - check if a task structure is init |
3260259f HK |
1968 | * @tsk: Task structure to be checked. |
1969 | * | |
1970 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1971 | * |
1972 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1973 | */ |
e868171a | 1974 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1975 | { |
1976 | return tsk->pid == 1; | |
1977 | } | |
b460cbc5 | 1978 | |
9ec52099 CLG |
1979 | extern struct pid *cad_pid; |
1980 | ||
1da177e4 | 1981 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1982 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1983 | |
158d9ebd | 1984 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1985 | |
1986 | static inline void put_task_struct(struct task_struct *t) | |
1987 | { | |
1988 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1989 | __put_task_struct(t); |
e56d0903 | 1990 | } |
1da177e4 | 1991 | |
6a61671b FW |
1992 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1993 | extern void task_cputime(struct task_struct *t, | |
1994 | cputime_t *utime, cputime_t *stime); | |
1995 | extern void task_cputime_scaled(struct task_struct *t, | |
1996 | cputime_t *utimescaled, cputime_t *stimescaled); | |
1997 | extern cputime_t task_gtime(struct task_struct *t); | |
1998 | #else | |
6fac4829 FW |
1999 | static inline void task_cputime(struct task_struct *t, |
2000 | cputime_t *utime, cputime_t *stime) | |
2001 | { | |
2002 | if (utime) | |
2003 | *utime = t->utime; | |
2004 | if (stime) | |
2005 | *stime = t->stime; | |
2006 | } | |
2007 | ||
2008 | static inline void task_cputime_scaled(struct task_struct *t, | |
2009 | cputime_t *utimescaled, | |
2010 | cputime_t *stimescaled) | |
2011 | { | |
2012 | if (utimescaled) | |
2013 | *utimescaled = t->utimescaled; | |
2014 | if (stimescaled) | |
2015 | *stimescaled = t->stimescaled; | |
2016 | } | |
6a61671b FW |
2017 | |
2018 | static inline cputime_t task_gtime(struct task_struct *t) | |
2019 | { | |
2020 | return t->gtime; | |
2021 | } | |
2022 | #endif | |
e80d0a1a FW |
2023 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
2024 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 2025 | |
1da177e4 LT |
2026 | /* |
2027 | * Per process flags | |
2028 | */ | |
1da177e4 | 2029 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 2030 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 2031 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 2032 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 2033 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 2034 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
2035 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
2036 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
2037 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
2038 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 2039 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 2040 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 2041 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
2042 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
2043 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
2044 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
2045 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 2046 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 2047 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 2048 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
2049 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
2050 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
14a40ffc | 2051 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 2052 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 2053 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 2054 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 2055 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
2056 | |
2057 | /* | |
2058 | * Only the _current_ task can read/write to tsk->flags, but other | |
2059 | * tasks can access tsk->flags in readonly mode for example | |
2060 | * with tsk_used_math (like during threaded core dumping). | |
2061 | * There is however an exception to this rule during ptrace | |
2062 | * or during fork: the ptracer task is allowed to write to the | |
2063 | * child->flags of its traced child (same goes for fork, the parent | |
2064 | * can write to the child->flags), because we're guaranteed the | |
2065 | * child is not running and in turn not changing child->flags | |
2066 | * at the same time the parent does it. | |
2067 | */ | |
2068 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
2069 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
2070 | #define clear_used_math() clear_stopped_child_used_math(current) | |
2071 | #define set_used_math() set_stopped_child_used_math(current) | |
2072 | #define conditional_stopped_child_used_math(condition, child) \ | |
2073 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
2074 | #define conditional_used_math(condition) \ | |
2075 | conditional_stopped_child_used_math(condition, current) | |
2076 | #define copy_to_stopped_child_used_math(child) \ | |
2077 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
2078 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
2079 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
2080 | #define used_math() tsk_used_math(current) | |
2081 | ||
934f3072 JB |
2082 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags |
2083 | * __GFP_FS is also cleared as it implies __GFP_IO. | |
2084 | */ | |
21caf2fc ML |
2085 | static inline gfp_t memalloc_noio_flags(gfp_t flags) |
2086 | { | |
2087 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
934f3072 | 2088 | flags &= ~(__GFP_IO | __GFP_FS); |
21caf2fc ML |
2089 | return flags; |
2090 | } | |
2091 | ||
2092 | static inline unsigned int memalloc_noio_save(void) | |
2093 | { | |
2094 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
2095 | current->flags |= PF_MEMALLOC_NOIO; | |
2096 | return flags; | |
2097 | } | |
2098 | ||
2099 | static inline void memalloc_noio_restore(unsigned int flags) | |
2100 | { | |
2101 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
2102 | } | |
2103 | ||
1d4457f9 | 2104 | /* Per-process atomic flags. */ |
a2b86f77 | 2105 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
2ad654bc ZL |
2106 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ |
2107 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
2108 | ||
1d4457f9 | 2109 | |
e0e5070b ZL |
2110 | #define TASK_PFA_TEST(name, func) \ |
2111 | static inline bool task_##func(struct task_struct *p) \ | |
2112 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
2113 | #define TASK_PFA_SET(name, func) \ | |
2114 | static inline void task_set_##func(struct task_struct *p) \ | |
2115 | { set_bit(PFA_##name, &p->atomic_flags); } | |
2116 | #define TASK_PFA_CLEAR(name, func) \ | |
2117 | static inline void task_clear_##func(struct task_struct *p) \ | |
2118 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
2119 | ||
2120 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
2121 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 2122 | |
2ad654bc ZL |
2123 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
2124 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
2125 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
2126 | ||
2127 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
2128 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
2129 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 2130 | |
e5c1902e | 2131 | /* |
a8f072c1 | 2132 | * task->jobctl flags |
e5c1902e | 2133 | */ |
a8f072c1 | 2134 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 2135 | |
a8f072c1 TH |
2136 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
2137 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
2138 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 2139 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 2140 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 2141 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 2142 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 | 2143 | |
b76808e6 PD |
2144 | #define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT) |
2145 | #define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT) | |
2146 | #define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT) | |
2147 | #define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT) | |
2148 | #define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT) | |
2149 | #define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT) | |
2150 | #define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT) | |
a8f072c1 | 2151 | |
fb1d910c | 2152 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 2153 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 2154 | |
7dd3db54 | 2155 | extern bool task_set_jobctl_pending(struct task_struct *task, |
b76808e6 | 2156 | unsigned long mask); |
73ddff2b | 2157 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 | 2158 | extern void task_clear_jobctl_pending(struct task_struct *task, |
b76808e6 | 2159 | unsigned long mask); |
39efa3ef | 2160 | |
f41d911f PM |
2161 | static inline void rcu_copy_process(struct task_struct *p) |
2162 | { | |
8315f422 | 2163 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f | 2164 | p->rcu_read_lock_nesting = 0; |
1d082fd0 | 2165 | p->rcu_read_unlock_special.s = 0; |
dd5d19ba | 2166 | p->rcu_blocked_node = NULL; |
f41d911f | 2167 | INIT_LIST_HEAD(&p->rcu_node_entry); |
8315f422 PM |
2168 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
2169 | #ifdef CONFIG_TASKS_RCU | |
2170 | p->rcu_tasks_holdout = false; | |
2171 | INIT_LIST_HEAD(&p->rcu_tasks_holdout_list); | |
176f8f7a | 2172 | p->rcu_tasks_idle_cpu = -1; |
8315f422 | 2173 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
f41d911f PM |
2174 | } |
2175 | ||
907aed48 MG |
2176 | static inline void tsk_restore_flags(struct task_struct *task, |
2177 | unsigned long orig_flags, unsigned long flags) | |
2178 | { | |
2179 | task->flags &= ~flags; | |
2180 | task->flags |= orig_flags & flags; | |
2181 | } | |
2182 | ||
f82f8042 JL |
2183 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, |
2184 | const struct cpumask *trial); | |
7f51412a JL |
2185 | extern int task_can_attach(struct task_struct *p, |
2186 | const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 2187 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
2188 | extern void do_set_cpus_allowed(struct task_struct *p, |
2189 | const struct cpumask *new_mask); | |
2190 | ||
cd8ba7cd | 2191 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2192 | const struct cpumask *new_mask); |
1da177e4 | 2193 | #else |
1e1b6c51 KM |
2194 | static inline void do_set_cpus_allowed(struct task_struct *p, |
2195 | const struct cpumask *new_mask) | |
2196 | { | |
2197 | } | |
cd8ba7cd | 2198 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2199 | const struct cpumask *new_mask) |
1da177e4 | 2200 | { |
96f874e2 | 2201 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
2202 | return -EINVAL; |
2203 | return 0; | |
2204 | } | |
2205 | #endif | |
e0ad9556 | 2206 | |
3451d024 | 2207 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
2208 | void calc_load_enter_idle(void); |
2209 | void calc_load_exit_idle(void); | |
2210 | #else | |
2211 | static inline void calc_load_enter_idle(void) { } | |
2212 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 2213 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 2214 | |
e0ad9556 | 2215 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
2216 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
2217 | { | |
2218 | return set_cpus_allowed_ptr(p, &new_mask); | |
2219 | } | |
e0ad9556 | 2220 | #endif |
1da177e4 | 2221 | |
b342501c | 2222 | /* |
c676329a PZ |
2223 | * Do not use outside of architecture code which knows its limitations. |
2224 | * | |
2225 | * sched_clock() has no promise of monotonicity or bounded drift between | |
2226 | * CPUs, use (which you should not) requires disabling IRQs. | |
2227 | * | |
2228 | * Please use one of the three interfaces below. | |
b342501c | 2229 | */ |
1bbfa6f2 | 2230 | extern unsigned long long notrace sched_clock(void); |
c676329a | 2231 | /* |
489a71b0 | 2232 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
2233 | */ |
2234 | extern u64 cpu_clock(int cpu); | |
2235 | extern u64 local_clock(void); | |
545a2bf7 | 2236 | extern u64 running_clock(void); |
c676329a PZ |
2237 | extern u64 sched_clock_cpu(int cpu); |
2238 | ||
e436d800 | 2239 | |
c1955a3d | 2240 | extern void sched_clock_init(void); |
3e51f33f | 2241 | |
c1955a3d | 2242 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
2243 | static inline void sched_clock_tick(void) |
2244 | { | |
2245 | } | |
2246 | ||
2247 | static inline void sched_clock_idle_sleep_event(void) | |
2248 | { | |
2249 | } | |
2250 | ||
2251 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
2252 | { | |
2253 | } | |
2254 | #else | |
c676329a PZ |
2255 | /* |
2256 | * Architectures can set this to 1 if they have specified | |
2257 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
2258 | * but then during bootup it turns out that sched_clock() | |
2259 | * is reliable after all: | |
2260 | */ | |
35af99e6 PZ |
2261 | extern int sched_clock_stable(void); |
2262 | extern void set_sched_clock_stable(void); | |
2263 | extern void clear_sched_clock_stable(void); | |
c676329a | 2264 | |
3e51f33f PZ |
2265 | extern void sched_clock_tick(void); |
2266 | extern void sched_clock_idle_sleep_event(void); | |
2267 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
2268 | #endif | |
2269 | ||
b52bfee4 VP |
2270 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
2271 | /* | |
2272 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
2273 | * The reason for this explicit opt-in is not to have perf penalty with | |
2274 | * slow sched_clocks. | |
2275 | */ | |
2276 | extern void enable_sched_clock_irqtime(void); | |
2277 | extern void disable_sched_clock_irqtime(void); | |
2278 | #else | |
2279 | static inline void enable_sched_clock_irqtime(void) {} | |
2280 | static inline void disable_sched_clock_irqtime(void) {} | |
2281 | #endif | |
2282 | ||
36c8b586 | 2283 | extern unsigned long long |
41b86e9c | 2284 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2285 | |
2286 | /* sched_exec is called by processes performing an exec */ | |
2287 | #ifdef CONFIG_SMP | |
2288 | extern void sched_exec(void); | |
2289 | #else | |
2290 | #define sched_exec() {} | |
2291 | #endif | |
2292 | ||
2aa44d05 IM |
2293 | extern void sched_clock_idle_sleep_event(void); |
2294 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2295 | |
1da177e4 LT |
2296 | #ifdef CONFIG_HOTPLUG_CPU |
2297 | extern void idle_task_exit(void); | |
2298 | #else | |
2299 | static inline void idle_task_exit(void) {} | |
2300 | #endif | |
2301 | ||
3451d024 | 2302 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 2303 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 2304 | #else |
1c20091e | 2305 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
2306 | #endif |
2307 | ||
ce831b38 FW |
2308 | #ifdef CONFIG_NO_HZ_FULL |
2309 | extern bool sched_can_stop_tick(void); | |
265f22a9 | 2310 | extern u64 scheduler_tick_max_deferment(void); |
ce831b38 FW |
2311 | #else |
2312 | static inline bool sched_can_stop_tick(void) { return false; } | |
06d8308c TG |
2313 | #endif |
2314 | ||
5091faa4 | 2315 | #ifdef CONFIG_SCHED_AUTOGROUP |
5091faa4 MG |
2316 | extern void sched_autogroup_create_attach(struct task_struct *p); |
2317 | extern void sched_autogroup_detach(struct task_struct *p); | |
2318 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2319 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2320 | #ifdef CONFIG_PROC_FS | |
2321 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2322 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2323 | #endif |
2324 | #else | |
2325 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2326 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2327 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2328 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2329 | #endif | |
2330 | ||
fa93384f | 2331 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2332 | extern void set_user_nice(struct task_struct *p, long nice); |
2333 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
2334 | /** |
2335 | * task_nice - return the nice value of a given task. | |
2336 | * @p: the task in question. | |
2337 | * | |
2338 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
2339 | */ | |
2340 | static inline int task_nice(const struct task_struct *p) | |
2341 | { | |
2342 | return PRIO_TO_NICE((p)->static_prio); | |
2343 | } | |
36c8b586 IM |
2344 | extern int can_nice(const struct task_struct *p, const int nice); |
2345 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2346 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2347 | extern int sched_setscheduler(struct task_struct *, int, |
2348 | const struct sched_param *); | |
961ccddd | 2349 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2350 | const struct sched_param *); |
d50dde5a DF |
2351 | extern int sched_setattr(struct task_struct *, |
2352 | const struct sched_attr *); | |
36c8b586 | 2353 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2354 | /** |
2355 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2356 | * @p: the task in question. |
e69f6186 YB |
2357 | * |
2358 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 2359 | */ |
7061ca3b | 2360 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2361 | { |
2362 | return p->pid == 0; | |
2363 | } | |
36c8b586 IM |
2364 | extern struct task_struct *curr_task(int cpu); |
2365 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2366 | |
2367 | void yield(void); | |
2368 | ||
1da177e4 LT |
2369 | union thread_union { |
2370 | struct thread_info thread_info; | |
2371 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2372 | }; | |
2373 | ||
2374 | #ifndef __HAVE_ARCH_KSTACK_END | |
2375 | static inline int kstack_end(void *addr) | |
2376 | { | |
2377 | /* Reliable end of stack detection: | |
2378 | * Some APM bios versions misalign the stack | |
2379 | */ | |
2380 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2381 | } | |
2382 | #endif | |
2383 | ||
2384 | extern union thread_union init_thread_union; | |
2385 | extern struct task_struct init_task; | |
2386 | ||
2387 | extern struct mm_struct init_mm; | |
2388 | ||
198fe21b PE |
2389 | extern struct pid_namespace init_pid_ns; |
2390 | ||
2391 | /* | |
2392 | * find a task by one of its numerical ids | |
2393 | * | |
198fe21b PE |
2394 | * find_task_by_pid_ns(): |
2395 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2396 | * find_task_by_vpid(): |
2397 | * finds a task by its virtual pid | |
198fe21b | 2398 | * |
e49859e7 | 2399 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2400 | */ |
2401 | ||
228ebcbe PE |
2402 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2403 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2404 | struct pid_namespace *ns); | |
198fe21b | 2405 | |
1da177e4 | 2406 | /* per-UID process charging. */ |
7b44ab97 | 2407 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2408 | static inline struct user_struct *get_uid(struct user_struct *u) |
2409 | { | |
2410 | atomic_inc(&u->__count); | |
2411 | return u; | |
2412 | } | |
2413 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2414 | |
2415 | #include <asm/current.h> | |
2416 | ||
f0af911a | 2417 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2418 | |
b3c97528 HH |
2419 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2420 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2421 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2422 | #ifdef CONFIG_SMP |
2423 | extern void kick_process(struct task_struct *tsk); | |
2424 | #else | |
2425 | static inline void kick_process(struct task_struct *tsk) { } | |
2426 | #endif | |
aab03e05 | 2427 | extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
ad46c2c4 | 2428 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2429 | |
1da177e4 LT |
2430 | extern void proc_caches_init(void); |
2431 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2432 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2433 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2434 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2435 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2436 | ||
2437 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2438 | { | |
2439 | unsigned long flags; | |
2440 | int ret; | |
2441 | ||
2442 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2443 | ret = dequeue_signal(tsk, mask, info); | |
2444 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2445 | ||
2446 | return ret; | |
53c8f9f1 | 2447 | } |
1da177e4 LT |
2448 | |
2449 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2450 | sigset_t *mask); | |
2451 | extern void unblock_all_signals(void); | |
2452 | extern void release_task(struct task_struct * p); | |
2453 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2454 | extern int force_sigsegv(int, struct task_struct *); |
2455 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2456 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2457 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2458 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2459 | const struct cred *, u32); | |
c4b92fc1 EB |
2460 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2461 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2462 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2463 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2464 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2465 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2466 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2467 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2468 | extern struct sigqueue *sigqueue_alloc(void); |
2469 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2470 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2471 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 | 2472 | |
51a7b448 AV |
2473 | static inline void restore_saved_sigmask(void) |
2474 | { | |
2475 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2476 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2477 | } |
2478 | ||
b7f9a11a AV |
2479 | static inline sigset_t *sigmask_to_save(void) |
2480 | { | |
2481 | sigset_t *res = ¤t->blocked; | |
2482 | if (unlikely(test_restore_sigmask())) | |
2483 | res = ¤t->saved_sigmask; | |
2484 | return res; | |
2485 | } | |
2486 | ||
9ec52099 CLG |
2487 | static inline int kill_cad_pid(int sig, int priv) |
2488 | { | |
2489 | return kill_pid(cad_pid, sig, priv); | |
2490 | } | |
2491 | ||
1da177e4 LT |
2492 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2493 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2494 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2495 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2496 | ||
2a855dd0 SAS |
2497 | /* |
2498 | * True if we are on the alternate signal stack. | |
2499 | */ | |
1da177e4 LT |
2500 | static inline int on_sig_stack(unsigned long sp) |
2501 | { | |
2a855dd0 SAS |
2502 | #ifdef CONFIG_STACK_GROWSUP |
2503 | return sp >= current->sas_ss_sp && | |
2504 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2505 | #else | |
2506 | return sp > current->sas_ss_sp && | |
2507 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2508 | #endif | |
1da177e4 LT |
2509 | } |
2510 | ||
2511 | static inline int sas_ss_flags(unsigned long sp) | |
2512 | { | |
72f15c03 RW |
2513 | if (!current->sas_ss_size) |
2514 | return SS_DISABLE; | |
2515 | ||
2516 | return on_sig_stack(sp) ? SS_ONSTACK : 0; | |
1da177e4 LT |
2517 | } |
2518 | ||
5a1b98d3 AV |
2519 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) |
2520 | { | |
2521 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
2522 | #ifdef CONFIG_STACK_GROWSUP | |
2523 | return current->sas_ss_sp; | |
2524 | #else | |
2525 | return current->sas_ss_sp + current->sas_ss_size; | |
2526 | #endif | |
2527 | return sp; | |
2528 | } | |
2529 | ||
1da177e4 LT |
2530 | /* |
2531 | * Routines for handling mm_structs | |
2532 | */ | |
2533 | extern struct mm_struct * mm_alloc(void); | |
2534 | ||
2535 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2536 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2537 | static inline void mmdrop(struct mm_struct * mm) |
2538 | { | |
6fb43d7b | 2539 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2540 | __mmdrop(mm); |
2541 | } | |
2542 | ||
2543 | /* mmput gets rid of the mappings and all user-space */ | |
2544 | extern void mmput(struct mm_struct *); | |
2545 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2546 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2547 | /* |
2548 | * Grab a reference to a task's mm, if it is not already going away | |
2549 | * and ptrace_may_access with the mode parameter passed to it | |
2550 | * succeeds. | |
2551 | */ | |
2552 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2553 | /* Remove the current tasks stale references to the old mm_struct */ |
2554 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
2555 | ||
6f2c55b8 | 2556 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2557 | struct task_struct *); |
1da177e4 LT |
2558 | extern void flush_thread(void); |
2559 | extern void exit_thread(void); | |
2560 | ||
1da177e4 | 2561 | extern void exit_files(struct task_struct *); |
a7e5328a | 2562 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2563 | |
1da177e4 | 2564 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2565 | extern void flush_itimer_signals(void); |
1da177e4 | 2566 | |
9402c95f | 2567 | extern void do_group_exit(int); |
1da177e4 | 2568 | |
c4ad8f98 | 2569 | extern int do_execve(struct filename *, |
d7627467 | 2570 | const char __user * const __user *, |
da3d4c5f | 2571 | const char __user * const __user *); |
51f39a1f DD |
2572 | extern int do_execveat(int, struct filename *, |
2573 | const char __user * const __user *, | |
2574 | const char __user * const __user *, | |
2575 | int); | |
e80d6661 | 2576 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2577 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2578 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 | 2579 | |
82b89778 AH |
2580 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
2581 | static inline void set_task_comm(struct task_struct *tsk, const char *from) | |
2582 | { | |
2583 | __set_task_comm(tsk, from, false); | |
2584 | } | |
59714d65 | 2585 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2586 | |
2587 | #ifdef CONFIG_SMP | |
317f3941 | 2588 | void scheduler_ipi(void); |
85ba2d86 | 2589 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2590 | #else |
184748cc | 2591 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2592 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2593 | long match_state) | |
2594 | { | |
2595 | return 1; | |
2596 | } | |
1da177e4 LT |
2597 | #endif |
2598 | ||
05725f7e JP |
2599 | #define next_task(p) \ |
2600 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2601 | |
2602 | #define for_each_process(p) \ | |
2603 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2604 | ||
5bb459bb | 2605 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2606 | |
1da177e4 LT |
2607 | /* |
2608 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2609 | * 'break' will not work as expected - use goto instead. | |
2610 | */ | |
2611 | #define do_each_thread(g, t) \ | |
2612 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2613 | ||
2614 | #define while_each_thread(g, t) \ | |
2615 | while ((t = next_thread(t)) != g) | |
2616 | ||
0c740d0a ON |
2617 | #define __for_each_thread(signal, t) \ |
2618 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
2619 | ||
2620 | #define for_each_thread(p, t) \ | |
2621 | __for_each_thread((p)->signal, t) | |
2622 | ||
2623 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
2624 | #define for_each_process_thread(p, t) \ | |
2625 | for_each_process(p) for_each_thread(p, t) | |
2626 | ||
7e49827c ON |
2627 | static inline int get_nr_threads(struct task_struct *tsk) |
2628 | { | |
b3ac022c | 2629 | return tsk->signal->nr_threads; |
7e49827c ON |
2630 | } |
2631 | ||
087806b1 ON |
2632 | static inline bool thread_group_leader(struct task_struct *p) |
2633 | { | |
2634 | return p->exit_signal >= 0; | |
2635 | } | |
1da177e4 | 2636 | |
0804ef4b EB |
2637 | /* Do to the insanities of de_thread it is possible for a process |
2638 | * to have the pid of the thread group leader without actually being | |
2639 | * the thread group leader. For iteration through the pids in proc | |
2640 | * all we care about is that we have a task with the appropriate | |
2641 | * pid, we don't actually care if we have the right task. | |
2642 | */ | |
e1403b8e | 2643 | static inline bool has_group_leader_pid(struct task_struct *p) |
0804ef4b | 2644 | { |
e1403b8e | 2645 | return task_pid(p) == p->signal->leader_pid; |
0804ef4b EB |
2646 | } |
2647 | ||
bac0abd6 | 2648 | static inline |
e1403b8e | 2649 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) |
bac0abd6 | 2650 | { |
e1403b8e | 2651 | return p1->signal == p2->signal; |
bac0abd6 PE |
2652 | } |
2653 | ||
36c8b586 | 2654 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2655 | { |
05725f7e JP |
2656 | return list_entry_rcu(p->thread_group.next, |
2657 | struct task_struct, thread_group); | |
47e65328 ON |
2658 | } |
2659 | ||
e868171a | 2660 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2661 | { |
47e65328 | 2662 | return list_empty(&p->thread_group); |
1da177e4 LT |
2663 | } |
2664 | ||
2665 | #define delay_group_leader(p) \ | |
2666 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2667 | ||
1da177e4 | 2668 | /* |
260ea101 | 2669 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2670 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2671 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2672 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2673 | * |
2674 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2675 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2676 | * neither inside nor outside. | |
2677 | */ | |
2678 | static inline void task_lock(struct task_struct *p) | |
2679 | { | |
2680 | spin_lock(&p->alloc_lock); | |
2681 | } | |
2682 | ||
2683 | static inline void task_unlock(struct task_struct *p) | |
2684 | { | |
2685 | spin_unlock(&p->alloc_lock); | |
2686 | } | |
2687 | ||
b8ed374e | 2688 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2689 | unsigned long *flags); |
2690 | ||
9388dc30 AV |
2691 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2692 | unsigned long *flags) | |
2693 | { | |
2694 | struct sighand_struct *ret; | |
2695 | ||
2696 | ret = __lock_task_sighand(tsk, flags); | |
2697 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2698 | return ret; | |
2699 | } | |
b8ed374e | 2700 | |
f63ee72e ON |
2701 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2702 | unsigned long *flags) | |
2703 | { | |
2704 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2705 | } | |
2706 | ||
4714d1d3 | 2707 | #ifdef CONFIG_CGROUPS |
257058ae | 2708 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2709 | { |
257058ae | 2710 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2711 | } |
257058ae | 2712 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2713 | { |
257058ae | 2714 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2715 | } |
77e4ef99 TH |
2716 | |
2717 | /** | |
2718 | * threadgroup_lock - lock threadgroup | |
2719 | * @tsk: member task of the threadgroup to lock | |
2720 | * | |
2721 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2722 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
e56fb287 ON |
2723 | * change ->group_leader/pid. This is useful for cases where the threadgroup |
2724 | * needs to stay stable across blockable operations. | |
77e4ef99 TH |
2725 | * |
2726 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2727 | * synchronization. While held, no new task will be added to threadgroup | |
2728 | * and no existing live task will have its PF_EXITING set. | |
2729 | * | |
e56fb287 ON |
2730 | * de_thread() does threadgroup_change_{begin|end}() when a non-leader |
2731 | * sub-thread becomes a new leader. | |
77e4ef99 | 2732 | */ |
257058ae | 2733 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2734 | { |
257058ae | 2735 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2736 | } |
77e4ef99 TH |
2737 | |
2738 | /** | |
2739 | * threadgroup_unlock - unlock threadgroup | |
2740 | * @tsk: member task of the threadgroup to unlock | |
2741 | * | |
2742 | * Reverse threadgroup_lock(). | |
2743 | */ | |
257058ae | 2744 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2745 | { |
257058ae | 2746 | up_write(&tsk->signal->group_rwsem); |
4714d1d3 BB |
2747 | } |
2748 | #else | |
257058ae TH |
2749 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2750 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2751 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2752 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2753 | #endif |
2754 | ||
f037360f AV |
2755 | #ifndef __HAVE_THREAD_FUNCTIONS |
2756 | ||
f7e4217b RZ |
2757 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2758 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2759 | |
10ebffde AV |
2760 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2761 | { | |
2762 | *task_thread_info(p) = *task_thread_info(org); | |
2763 | task_thread_info(p)->task = p; | |
2764 | } | |
2765 | ||
6a40281a CE |
2766 | /* |
2767 | * Return the address of the last usable long on the stack. | |
2768 | * | |
2769 | * When the stack grows down, this is just above the thread | |
2770 | * info struct. Going any lower will corrupt the threadinfo. | |
2771 | * | |
2772 | * When the stack grows up, this is the highest address. | |
2773 | * Beyond that position, we corrupt data on the next page. | |
2774 | */ | |
10ebffde AV |
2775 | static inline unsigned long *end_of_stack(struct task_struct *p) |
2776 | { | |
6a40281a CE |
2777 | #ifdef CONFIG_STACK_GROWSUP |
2778 | return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1; | |
2779 | #else | |
f7e4217b | 2780 | return (unsigned long *)(task_thread_info(p) + 1); |
6a40281a | 2781 | #endif |
10ebffde AV |
2782 | } |
2783 | ||
f037360f | 2784 | #endif |
a70857e4 AT |
2785 | #define task_stack_end_corrupted(task) \ |
2786 | (*(end_of_stack(task)) != STACK_END_MAGIC) | |
f037360f | 2787 | |
8b05c7e6 FT |
2788 | static inline int object_is_on_stack(void *obj) |
2789 | { | |
2790 | void *stack = task_stack_page(current); | |
2791 | ||
2792 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2793 | } | |
2794 | ||
8c9843e5 BH |
2795 | extern void thread_info_cache_init(void); |
2796 | ||
7c9f8861 ES |
2797 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2798 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2799 | { | |
2800 | unsigned long *n = end_of_stack(p); | |
2801 | ||
2802 | do { /* Skip over canary */ | |
2803 | n++; | |
2804 | } while (!*n); | |
2805 | ||
2806 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2807 | } | |
2808 | #endif | |
d4311ff1 | 2809 | extern void set_task_stack_end_magic(struct task_struct *tsk); |
7c9f8861 | 2810 | |
1da177e4 LT |
2811 | /* set thread flags in other task's structures |
2812 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2813 | */ | |
2814 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2815 | { | |
a1261f54 | 2816 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2817 | } |
2818 | ||
2819 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2820 | { | |
a1261f54 | 2821 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2822 | } |
2823 | ||
2824 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2825 | { | |
a1261f54 | 2826 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2827 | } |
2828 | ||
2829 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2830 | { | |
a1261f54 | 2831 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2832 | } |
2833 | ||
2834 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2835 | { | |
a1261f54 | 2836 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2837 | } |
2838 | ||
2839 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2840 | { | |
2841 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2842 | } | |
2843 | ||
2844 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2845 | { | |
2846 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2847 | } | |
2848 | ||
8ae121ac GH |
2849 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2850 | { | |
2851 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2852 | } | |
2853 | ||
690cc3ff EB |
2854 | static inline int restart_syscall(void) |
2855 | { | |
2856 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2857 | return -ERESTARTNOINTR; | |
2858 | } | |
2859 | ||
1da177e4 LT |
2860 | static inline int signal_pending(struct task_struct *p) |
2861 | { | |
2862 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2863 | } | |
f776d12d | 2864 | |
d9588725 RM |
2865 | static inline int __fatal_signal_pending(struct task_struct *p) |
2866 | { | |
2867 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2868 | } | |
f776d12d MW |
2869 | |
2870 | static inline int fatal_signal_pending(struct task_struct *p) | |
2871 | { | |
2872 | return signal_pending(p) && __fatal_signal_pending(p); | |
2873 | } | |
2874 | ||
16882c1e ON |
2875 | static inline int signal_pending_state(long state, struct task_struct *p) |
2876 | { | |
2877 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2878 | return 0; | |
2879 | if (!signal_pending(p)) | |
2880 | return 0; | |
2881 | ||
16882c1e ON |
2882 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2883 | } | |
2884 | ||
1da177e4 LT |
2885 | /* |
2886 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2887 | * explicit rescheduling in places that are safe. The return | |
2888 | * value indicates whether a reschedule was done in fact. | |
2889 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2890 | * cond_resched_softirq() will enable bhs before scheduling. | |
2891 | */ | |
c3921ab7 | 2892 | extern int _cond_resched(void); |
6f80bd98 | 2893 | |
613afbf8 | 2894 | #define cond_resched() ({ \ |
3427445a | 2895 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2896 | _cond_resched(); \ |
2897 | }) | |
6f80bd98 | 2898 | |
613afbf8 FW |
2899 | extern int __cond_resched_lock(spinlock_t *lock); |
2900 | ||
bdd4e85d | 2901 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2902 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2903 | #else |
716a4234 | 2904 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2905 | #endif |
716a4234 | 2906 | |
613afbf8 | 2907 | #define cond_resched_lock(lock) ({ \ |
3427445a | 2908 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
2909 | __cond_resched_lock(lock); \ |
2910 | }) | |
2911 | ||
2912 | extern int __cond_resched_softirq(void); | |
2913 | ||
75e1056f | 2914 | #define cond_resched_softirq() ({ \ |
3427445a | 2915 | ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
75e1056f | 2916 | __cond_resched_softirq(); \ |
613afbf8 | 2917 | }) |
1da177e4 | 2918 | |
f6f3c437 SH |
2919 | static inline void cond_resched_rcu(void) |
2920 | { | |
2921 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2922 | rcu_read_unlock(); | |
2923 | cond_resched(); | |
2924 | rcu_read_lock(); | |
2925 | #endif | |
2926 | } | |
2927 | ||
1da177e4 LT |
2928 | /* |
2929 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2930 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2931 | * but a general need for low latency) | |
1da177e4 | 2932 | */ |
95c354fe | 2933 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2934 | { |
95c354fe NP |
2935 | #ifdef CONFIG_PREEMPT |
2936 | return spin_is_contended(lock); | |
2937 | #else | |
1da177e4 | 2938 | return 0; |
95c354fe | 2939 | #endif |
1da177e4 LT |
2940 | } |
2941 | ||
ee761f62 TG |
2942 | /* |
2943 | * Idle thread specific functions to determine the need_resched | |
69dd0f84 | 2944 | * polling state. |
ee761f62 | 2945 | */ |
69dd0f84 | 2946 | #ifdef TIF_POLLING_NRFLAG |
ee761f62 TG |
2947 | static inline int tsk_is_polling(struct task_struct *p) |
2948 | { | |
2949 | return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); | |
2950 | } | |
ea811747 PZ |
2951 | |
2952 | static inline void __current_set_polling(void) | |
3a98f871 TG |
2953 | { |
2954 | set_thread_flag(TIF_POLLING_NRFLAG); | |
2955 | } | |
2956 | ||
ea811747 PZ |
2957 | static inline bool __must_check current_set_polling_and_test(void) |
2958 | { | |
2959 | __current_set_polling(); | |
2960 | ||
2961 | /* | |
2962 | * Polling state must be visible before we test NEED_RESCHED, | |
8875125e | 2963 | * paired by resched_curr() |
ea811747 | 2964 | */ |
4e857c58 | 2965 | smp_mb__after_atomic(); |
ea811747 PZ |
2966 | |
2967 | return unlikely(tif_need_resched()); | |
2968 | } | |
2969 | ||
2970 | static inline void __current_clr_polling(void) | |
3a98f871 TG |
2971 | { |
2972 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
2973 | } | |
ea811747 PZ |
2974 | |
2975 | static inline bool __must_check current_clr_polling_and_test(void) | |
2976 | { | |
2977 | __current_clr_polling(); | |
2978 | ||
2979 | /* | |
2980 | * Polling state must be visible before we test NEED_RESCHED, | |
8875125e | 2981 | * paired by resched_curr() |
ea811747 | 2982 | */ |
4e857c58 | 2983 | smp_mb__after_atomic(); |
ea811747 PZ |
2984 | |
2985 | return unlikely(tif_need_resched()); | |
2986 | } | |
2987 | ||
ee761f62 TG |
2988 | #else |
2989 | static inline int tsk_is_polling(struct task_struct *p) { return 0; } | |
ea811747 PZ |
2990 | static inline void __current_set_polling(void) { } |
2991 | static inline void __current_clr_polling(void) { } | |
2992 | ||
2993 | static inline bool __must_check current_set_polling_and_test(void) | |
2994 | { | |
2995 | return unlikely(tif_need_resched()); | |
2996 | } | |
2997 | static inline bool __must_check current_clr_polling_and_test(void) | |
2998 | { | |
2999 | return unlikely(tif_need_resched()); | |
3000 | } | |
ee761f62 TG |
3001 | #endif |
3002 | ||
8cb75e0c PZ |
3003 | static inline void current_clr_polling(void) |
3004 | { | |
3005 | __current_clr_polling(); | |
3006 | ||
3007 | /* | |
3008 | * Ensure we check TIF_NEED_RESCHED after we clear the polling bit. | |
3009 | * Once the bit is cleared, we'll get IPIs with every new | |
3010 | * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also | |
3011 | * fold. | |
3012 | */ | |
8875125e | 3013 | smp_mb(); /* paired with resched_curr() */ |
8cb75e0c PZ |
3014 | |
3015 | preempt_fold_need_resched(); | |
3016 | } | |
3017 | ||
75f93fed PZ |
3018 | static __always_inline bool need_resched(void) |
3019 | { | |
3020 | return unlikely(tif_need_resched()); | |
3021 | } | |
3022 | ||
f06febc9 FM |
3023 | /* |
3024 | * Thread group CPU time accounting. | |
3025 | */ | |
4cd4c1b4 | 3026 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 3027 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 3028 | |
7bb44ade RM |
3029 | /* |
3030 | * Reevaluate whether the task has signals pending delivery. | |
3031 | * Wake the task if so. | |
3032 | * This is required every time the blocked sigset_t changes. | |
3033 | * callers must hold sighand->siglock. | |
3034 | */ | |
3035 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
3036 | extern void recalc_sigpending(void); |
3037 | ||
910ffdb1 ON |
3038 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
3039 | ||
3040 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
3041 | { | |
3042 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
3043 | } | |
3044 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
3045 | { | |
3046 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
3047 | } | |
1da177e4 LT |
3048 | |
3049 | /* | |
3050 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
3051 | */ | |
3052 | #ifdef CONFIG_SMP | |
3053 | ||
3054 | static inline unsigned int task_cpu(const struct task_struct *p) | |
3055 | { | |
a1261f54 | 3056 | return task_thread_info(p)->cpu; |
1da177e4 LT |
3057 | } |
3058 | ||
b32e86b4 IM |
3059 | static inline int task_node(const struct task_struct *p) |
3060 | { | |
3061 | return cpu_to_node(task_cpu(p)); | |
3062 | } | |
3063 | ||
c65cc870 | 3064 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
3065 | |
3066 | #else | |
3067 | ||
3068 | static inline unsigned int task_cpu(const struct task_struct *p) | |
3069 | { | |
3070 | return 0; | |
3071 | } | |
3072 | ||
3073 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
3074 | { | |
3075 | } | |
3076 | ||
3077 | #endif /* CONFIG_SMP */ | |
3078 | ||
96f874e2 RR |
3079 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
3080 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 3081 | |
7c941438 | 3082 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 3083 | extern struct task_group root_task_group; |
8323f26c | 3084 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 3085 | |
54e99124 DG |
3086 | extern int task_can_switch_user(struct user_struct *up, |
3087 | struct task_struct *tsk); | |
3088 | ||
4b98d11b AD |
3089 | #ifdef CONFIG_TASK_XACCT |
3090 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
3091 | { | |
940389b8 | 3092 | tsk->ioac.rchar += amt; |
4b98d11b AD |
3093 | } |
3094 | ||
3095 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
3096 | { | |
940389b8 | 3097 | tsk->ioac.wchar += amt; |
4b98d11b AD |
3098 | } |
3099 | ||
3100 | static inline void inc_syscr(struct task_struct *tsk) | |
3101 | { | |
940389b8 | 3102 | tsk->ioac.syscr++; |
4b98d11b AD |
3103 | } |
3104 | ||
3105 | static inline void inc_syscw(struct task_struct *tsk) | |
3106 | { | |
940389b8 | 3107 | tsk->ioac.syscw++; |
4b98d11b AD |
3108 | } |
3109 | #else | |
3110 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
3111 | { | |
3112 | } | |
3113 | ||
3114 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
3115 | { | |
3116 | } | |
3117 | ||
3118 | static inline void inc_syscr(struct task_struct *tsk) | |
3119 | { | |
3120 | } | |
3121 | ||
3122 | static inline void inc_syscw(struct task_struct *tsk) | |
3123 | { | |
3124 | } | |
3125 | #endif | |
3126 | ||
82455257 DH |
3127 | #ifndef TASK_SIZE_OF |
3128 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
3129 | #endif | |
3130 | ||
f98bafa0 | 3131 | #ifdef CONFIG_MEMCG |
cf475ad2 | 3132 | extern void mm_update_next_owner(struct mm_struct *mm); |
cf475ad2 BS |
3133 | #else |
3134 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
3135 | { | |
3136 | } | |
f98bafa0 | 3137 | #endif /* CONFIG_MEMCG */ |
cf475ad2 | 3138 | |
3e10e716 JS |
3139 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
3140 | unsigned int limit) | |
3141 | { | |
316c1608 | 3142 | return READ_ONCE(tsk->signal->rlim[limit].rlim_cur); |
3e10e716 JS |
3143 | } |
3144 | ||
3145 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
3146 | unsigned int limit) | |
3147 | { | |
316c1608 | 3148 | return READ_ONCE(tsk->signal->rlim[limit].rlim_max); |
3e10e716 JS |
3149 | } |
3150 | ||
3151 | static inline unsigned long rlimit(unsigned int limit) | |
3152 | { | |
3153 | return task_rlimit(current, limit); | |
3154 | } | |
3155 | ||
3156 | static inline unsigned long rlimit_max(unsigned int limit) | |
3157 | { | |
3158 | return task_rlimit_max(current, limit); | |
3159 | } | |
3160 | ||
1da177e4 | 3161 | #endif |