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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> |
00d1a39e | 28 | #include <linux/preempt_mask.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 | ||
1da177e4 | 128 | struct exec_domain; |
c87e2837 | 129 | struct futex_pi_state; |
286100a6 | 130 | struct robust_list_head; |
bddd87c7 | 131 | struct bio_list; |
5ad4e53b | 132 | struct fs_struct; |
cdd6c482 | 133 | struct perf_event_context; |
73c10101 | 134 | struct blk_plug; |
c4ad8f98 | 135 | struct filename; |
1da177e4 | 136 | |
615d6e87 DB |
137 | #define VMACACHE_BITS 2 |
138 | #define VMACACHE_SIZE (1U << VMACACHE_BITS) | |
139 | #define VMACACHE_MASK (VMACACHE_SIZE - 1) | |
140 | ||
1da177e4 LT |
141 | /* |
142 | * These are the constant used to fake the fixed-point load-average | |
143 | * counting. Some notes: | |
144 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
145 | * a load-average precision of 10 bits integer + 11 bits fractional | |
146 | * - if you want to count load-averages more often, you need more | |
147 | * precision, or rounding will get you. With 2-second counting freq, | |
148 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
149 | * 11 bit fractions. | |
150 | */ | |
151 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 152 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
153 | |
154 | #define FSHIFT 11 /* nr of bits of precision */ | |
155 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 156 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
157 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
158 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
159 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
160 | ||
161 | #define CALC_LOAD(load,exp,n) \ | |
162 | load *= exp; \ | |
163 | load += n*(FIXED_1-exp); \ | |
164 | load >>= FSHIFT; | |
165 | ||
166 | extern unsigned long total_forks; | |
167 | extern int nr_threads; | |
1da177e4 LT |
168 | DECLARE_PER_CPU(unsigned long, process_counts); |
169 | extern int nr_processes(void); | |
170 | extern unsigned long nr_running(void); | |
2ee507c4 | 171 | extern bool single_task_running(void); |
1da177e4 | 172 | extern unsigned long nr_iowait(void); |
8c215bd3 | 173 | extern unsigned long nr_iowait_cpu(int cpu); |
372ba8cb | 174 | extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load); |
69d25870 | 175 | |
0f004f5a | 176 | extern void calc_global_load(unsigned long ticks); |
5aaa0b7a | 177 | extern void update_cpu_load_nohz(void); |
1da177e4 | 178 | |
7e49fcce SR |
179 | extern unsigned long get_parent_ip(unsigned long addr); |
180 | ||
b637a328 PM |
181 | extern void dump_cpu_task(int cpu); |
182 | ||
43ae34cb IM |
183 | struct seq_file; |
184 | struct cfs_rq; | |
4cf86d77 | 185 | struct task_group; |
43ae34cb IM |
186 | #ifdef CONFIG_SCHED_DEBUG |
187 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
188 | extern void proc_sched_set_task(struct task_struct *p); | |
189 | extern void | |
5cef9eca | 190 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb | 191 | #endif |
1da177e4 | 192 | |
4a8342d2 LT |
193 | /* |
194 | * Task state bitmask. NOTE! These bits are also | |
195 | * encoded in fs/proc/array.c: get_task_state(). | |
196 | * | |
197 | * We have two separate sets of flags: task->state | |
198 | * is about runnability, while task->exit_state are | |
199 | * about the task exiting. Confusing, but this way | |
200 | * modifying one set can't modify the other one by | |
201 | * mistake. | |
202 | */ | |
1da177e4 LT |
203 | #define TASK_RUNNING 0 |
204 | #define TASK_INTERRUPTIBLE 1 | |
205 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
206 | #define __TASK_STOPPED 4 |
207 | #define __TASK_TRACED 8 | |
4a8342d2 | 208 | /* in tsk->exit_state */ |
ad86622b ON |
209 | #define EXIT_DEAD 16 |
210 | #define EXIT_ZOMBIE 32 | |
abd50b39 | 211 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
4a8342d2 | 212 | /* in tsk->state again */ |
af927232 | 213 | #define TASK_DEAD 64 |
f021a3c2 | 214 | #define TASK_WAKEKILL 128 |
e9c84311 | 215 | #define TASK_WAKING 256 |
f2530dc7 TG |
216 | #define TASK_PARKED 512 |
217 | #define TASK_STATE_MAX 1024 | |
f021a3c2 | 218 | |
ad0f614e | 219 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP" |
73342151 | 220 | |
e1781538 PZ |
221 | extern char ___assert_task_state[1 - 2*!!( |
222 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
223 | |
224 | /* Convenience macros for the sake of set_task_state */ | |
225 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
226 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
227 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 228 | |
92a1f4bc MW |
229 | /* Convenience macros for the sake of wake_up */ |
230 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 231 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
232 | |
233 | /* get_task_state() */ | |
234 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 235 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 236 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 237 | |
f021a3c2 MW |
238 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
239 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 240 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 241 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 242 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 243 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 244 | (task->flags & PF_FROZEN) == 0) |
1da177e4 | 245 | |
8eb23b9f PZ |
246 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
247 | ||
248 | #define __set_task_state(tsk, state_value) \ | |
249 | do { \ | |
250 | (tsk)->task_state_change = _THIS_IP_; \ | |
251 | (tsk)->state = (state_value); \ | |
252 | } while (0) | |
253 | #define set_task_state(tsk, state_value) \ | |
254 | do { \ | |
255 | (tsk)->task_state_change = _THIS_IP_; \ | |
256 | set_mb((tsk)->state, (state_value)); \ | |
257 | } while (0) | |
258 | ||
259 | /* | |
260 | * set_current_state() includes a barrier so that the write of current->state | |
261 | * is correctly serialised wrt the caller's subsequent test of whether to | |
262 | * actually sleep: | |
263 | * | |
264 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
265 | * if (do_i_need_to_sleep()) | |
266 | * schedule(); | |
267 | * | |
268 | * If the caller does not need such serialisation then use __set_current_state() | |
269 | */ | |
270 | #define __set_current_state(state_value) \ | |
271 | do { \ | |
272 | current->task_state_change = _THIS_IP_; \ | |
273 | current->state = (state_value); \ | |
274 | } while (0) | |
275 | #define set_current_state(state_value) \ | |
276 | do { \ | |
277 | current->task_state_change = _THIS_IP_; \ | |
278 | set_mb(current->state, (state_value)); \ | |
279 | } while (0) | |
280 | ||
281 | #else | |
282 | ||
1da177e4 LT |
283 | #define __set_task_state(tsk, state_value) \ |
284 | do { (tsk)->state = (state_value); } while (0) | |
285 | #define set_task_state(tsk, state_value) \ | |
286 | set_mb((tsk)->state, (state_value)) | |
287 | ||
498d0c57 AM |
288 | /* |
289 | * set_current_state() includes a barrier so that the write of current->state | |
290 | * is correctly serialised wrt the caller's subsequent test of whether to | |
291 | * actually sleep: | |
292 | * | |
293 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
294 | * if (do_i_need_to_sleep()) | |
295 | * schedule(); | |
296 | * | |
297 | * If the caller does not need such serialisation then use __set_current_state() | |
298 | */ | |
8eb23b9f | 299 | #define __set_current_state(state_value) \ |
1da177e4 | 300 | do { current->state = (state_value); } while (0) |
8eb23b9f | 301 | #define set_current_state(state_value) \ |
1da177e4 LT |
302 | set_mb(current->state, (state_value)) |
303 | ||
8eb23b9f PZ |
304 | #endif |
305 | ||
1da177e4 LT |
306 | /* Task command name length */ |
307 | #define TASK_COMM_LEN 16 | |
308 | ||
1da177e4 LT |
309 | #include <linux/spinlock.h> |
310 | ||
311 | /* | |
312 | * This serializes "schedule()" and also protects | |
313 | * the run-queue from deletions/modifications (but | |
314 | * _adding_ to the beginning of the run-queue has | |
315 | * a separate lock). | |
316 | */ | |
317 | extern rwlock_t tasklist_lock; | |
318 | extern spinlock_t mmlist_lock; | |
319 | ||
36c8b586 | 320 | struct task_struct; |
1da177e4 | 321 | |
db1466b3 PM |
322 | #ifdef CONFIG_PROVE_RCU |
323 | extern int lockdep_tasklist_lock_is_held(void); | |
324 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
325 | ||
1da177e4 LT |
326 | extern void sched_init(void); |
327 | extern void sched_init_smp(void); | |
2d07b255 | 328 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 329 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 330 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 331 | |
89f19f04 | 332 | extern int runqueue_is_locked(int cpu); |
017730c1 | 333 | |
3451d024 | 334 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 335 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 336 | extern void set_cpu_sd_state_idle(void); |
6201b4d6 | 337 | extern int get_nohz_timer_target(int pinned); |
46cb4b7c | 338 | #else |
c1cc017c | 339 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 340 | static inline void set_cpu_sd_state_idle(void) { } |
6201b4d6 VK |
341 | static inline int get_nohz_timer_target(int pinned) |
342 | { | |
343 | return smp_processor_id(); | |
344 | } | |
46cb4b7c | 345 | #endif |
1da177e4 | 346 | |
e59e2ae2 | 347 | /* |
39bc89fd | 348 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
349 | */ |
350 | extern void show_state_filter(unsigned long state_filter); | |
351 | ||
352 | static inline void show_state(void) | |
353 | { | |
39bc89fd | 354 | show_state_filter(0); |
e59e2ae2 IM |
355 | } |
356 | ||
1da177e4 LT |
357 | extern void show_regs(struct pt_regs *); |
358 | ||
359 | /* | |
360 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
361 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
362 | * trace (or NULL if the entire call-chain of the task should be shown). | |
363 | */ | |
364 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
365 | ||
1da177e4 LT |
366 | extern void cpu_init (void); |
367 | extern void trap_init(void); | |
368 | extern void update_process_times(int user); | |
369 | extern void scheduler_tick(void); | |
370 | ||
82a1fcb9 IM |
371 | extern void sched_show_task(struct task_struct *p); |
372 | ||
19cc36c0 | 373 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 374 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 375 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 376 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
377 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
378 | void __user *buffer, | |
379 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 380 | extern unsigned int softlockup_panic; |
004417a6 | 381 | void lockup_detector_init(void); |
8446f1d3 | 382 | #else |
8446f1d3 IM |
383 | static inline void touch_softlockup_watchdog(void) |
384 | { | |
385 | } | |
d6ad3e28 JW |
386 | static inline void touch_softlockup_watchdog_sync(void) |
387 | { | |
388 | } | |
04c9167f JF |
389 | static inline void touch_all_softlockup_watchdogs(void) |
390 | { | |
391 | } | |
004417a6 PZ |
392 | static inline void lockup_detector_init(void) |
393 | { | |
394 | } | |
8446f1d3 IM |
395 | #endif |
396 | ||
8b414521 MT |
397 | #ifdef CONFIG_DETECT_HUNG_TASK |
398 | void reset_hung_task_detector(void); | |
399 | #else | |
400 | static inline void reset_hung_task_detector(void) | |
401 | { | |
402 | } | |
403 | #endif | |
404 | ||
1da177e4 LT |
405 | /* Attach to any functions which should be ignored in wchan output. */ |
406 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
407 | |
408 | /* Linker adds these: start and end of __sched functions */ | |
409 | extern char __sched_text_start[], __sched_text_end[]; | |
410 | ||
1da177e4 LT |
411 | /* Is this address in the __sched functions? */ |
412 | extern int in_sched_functions(unsigned long addr); | |
413 | ||
414 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 415 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 416 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 417 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 418 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 419 | asmlinkage void schedule(void); |
c5491ea7 | 420 | extern void schedule_preempt_disabled(void); |
1da177e4 | 421 | |
9cff8ade N |
422 | extern long io_schedule_timeout(long timeout); |
423 | ||
424 | static inline void io_schedule(void) | |
425 | { | |
426 | io_schedule_timeout(MAX_SCHEDULE_TIMEOUT); | |
427 | } | |
428 | ||
ab516013 | 429 | struct nsproxy; |
acce292c | 430 | struct user_namespace; |
1da177e4 | 431 | |
efc1a3b1 DH |
432 | #ifdef CONFIG_MMU |
433 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
434 | extern unsigned long |
435 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
436 | unsigned long, unsigned long); | |
437 | extern unsigned long | |
438 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
439 | unsigned long len, unsigned long pgoff, | |
440 | unsigned long flags); | |
efc1a3b1 DH |
441 | #else |
442 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
443 | #endif | |
1da177e4 | 444 | |
d049f74f KC |
445 | #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ |
446 | #define SUID_DUMP_USER 1 /* Dump as user of process */ | |
447 | #define SUID_DUMP_ROOT 2 /* Dump as root */ | |
448 | ||
6c5d5238 | 449 | /* mm flags */ |
f8af4da3 | 450 | |
7288e118 | 451 | /* for SUID_DUMP_* above */ |
3cb4a0bb | 452 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 453 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb | 454 | |
942be387 ON |
455 | extern void set_dumpable(struct mm_struct *mm, int value); |
456 | /* | |
457 | * This returns the actual value of the suid_dumpable flag. For things | |
458 | * that are using this for checking for privilege transitions, it must | |
459 | * test against SUID_DUMP_USER rather than treating it as a boolean | |
460 | * value. | |
461 | */ | |
462 | static inline int __get_dumpable(unsigned long mm_flags) | |
463 | { | |
464 | return mm_flags & MMF_DUMPABLE_MASK; | |
465 | } | |
466 | ||
467 | static inline int get_dumpable(struct mm_struct *mm) | |
468 | { | |
469 | return __get_dumpable(mm->flags); | |
470 | } | |
471 | ||
3cb4a0bb KH |
472 | /* coredump filter bits */ |
473 | #define MMF_DUMP_ANON_PRIVATE 2 | |
474 | #define MMF_DUMP_ANON_SHARED 3 | |
475 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
476 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 477 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
478 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
479 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 480 | |
3cb4a0bb | 481 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 482 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
483 | #define MMF_DUMP_FILTER_MASK \ |
484 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
485 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 486 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
487 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
488 | ||
489 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
490 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
491 | #else | |
492 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
493 | #endif | |
f8af4da3 HD |
494 | /* leave room for more dump flags */ |
495 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 496 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 497 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 498 | |
9f68f672 ON |
499 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
500 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 501 | |
f8af4da3 | 502 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 503 | |
1da177e4 LT |
504 | struct sighand_struct { |
505 | atomic_t count; | |
506 | struct k_sigaction action[_NSIG]; | |
507 | spinlock_t siglock; | |
b8fceee1 | 508 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
509 | }; |
510 | ||
0e464814 | 511 | struct pacct_struct { |
f6ec29a4 KK |
512 | int ac_flag; |
513 | long ac_exitcode; | |
0e464814 | 514 | unsigned long ac_mem; |
77787bfb KK |
515 | cputime_t ac_utime, ac_stime; |
516 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
517 | }; |
518 | ||
42c4ab41 SG |
519 | struct cpu_itimer { |
520 | cputime_t expires; | |
521 | cputime_t incr; | |
8356b5f9 SG |
522 | u32 error; |
523 | u32 incr_error; | |
42c4ab41 SG |
524 | }; |
525 | ||
d37f761d FW |
526 | /** |
527 | * struct cputime - snaphsot of system and user cputime | |
528 | * @utime: time spent in user mode | |
529 | * @stime: time spent in system mode | |
530 | * | |
531 | * Gathers a generic snapshot of user and system time. | |
532 | */ | |
533 | struct cputime { | |
534 | cputime_t utime; | |
535 | cputime_t stime; | |
536 | }; | |
537 | ||
f06febc9 FM |
538 | /** |
539 | * struct task_cputime - collected CPU time counts | |
540 | * @utime: time spent in user mode, in &cputime_t units | |
541 | * @stime: time spent in kernel mode, in &cputime_t units | |
542 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 543 | * |
d37f761d FW |
544 | * This is an extension of struct cputime that includes the total runtime |
545 | * spent by the task from the scheduler point of view. | |
546 | * | |
547 | * As a result, this structure groups together three kinds of CPU time | |
548 | * that are tracked for threads and thread groups. Most things considering | |
f06febc9 FM |
549 | * CPU time want to group these counts together and treat all three |
550 | * of them in parallel. | |
551 | */ | |
552 | struct task_cputime { | |
553 | cputime_t utime; | |
554 | cputime_t stime; | |
555 | unsigned long long sum_exec_runtime; | |
556 | }; | |
557 | /* Alternate field names when used to cache expirations. */ | |
558 | #define prof_exp stime | |
559 | #define virt_exp utime | |
560 | #define sched_exp sum_exec_runtime | |
561 | ||
4cd4c1b4 PZ |
562 | #define INIT_CPUTIME \ |
563 | (struct task_cputime) { \ | |
64861634 MS |
564 | .utime = 0, \ |
565 | .stime = 0, \ | |
4cd4c1b4 PZ |
566 | .sum_exec_runtime = 0, \ |
567 | } | |
568 | ||
a233f112 PZ |
569 | #ifdef CONFIG_PREEMPT_COUNT |
570 | #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED) | |
571 | #else | |
572 | #define PREEMPT_DISABLED PREEMPT_ENABLED | |
573 | #endif | |
574 | ||
c99e6efe PZ |
575 | /* |
576 | * Disable preemption until the scheduler is running. | |
577 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
578 | * |
579 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
580 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 581 | */ |
a233f112 | 582 | #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE) |
c99e6efe | 583 | |
f06febc9 | 584 | /** |
4cd4c1b4 PZ |
585 | * struct thread_group_cputimer - thread group interval timer counts |
586 | * @cputime: thread group interval timers. | |
587 | * @running: non-zero when there are timers running and | |
588 | * @cputime receives updates. | |
589 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
590 | * |
591 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 592 | * used for thread group CPU timer calculations. |
f06febc9 | 593 | */ |
4cd4c1b4 PZ |
594 | struct thread_group_cputimer { |
595 | struct task_cputime cputime; | |
596 | int running; | |
ee30a7b2 | 597 | raw_spinlock_t lock; |
f06febc9 | 598 | }; |
f06febc9 | 599 | |
4714d1d3 | 600 | #include <linux/rwsem.h> |
5091faa4 MG |
601 | struct autogroup; |
602 | ||
1da177e4 | 603 | /* |
e815f0a8 | 604 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
605 | * locking, because a shared signal_struct always |
606 | * implies a shared sighand_struct, so locking | |
607 | * sighand_struct is always a proper superset of | |
608 | * the locking of signal_struct. | |
609 | */ | |
610 | struct signal_struct { | |
ea6d290c | 611 | atomic_t sigcnt; |
1da177e4 | 612 | atomic_t live; |
b3ac022c | 613 | int nr_threads; |
0c740d0a | 614 | struct list_head thread_head; |
1da177e4 LT |
615 | |
616 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
617 | ||
618 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 619 | struct task_struct *curr_target; |
1da177e4 LT |
620 | |
621 | /* shared signal handling: */ | |
622 | struct sigpending shared_pending; | |
623 | ||
624 | /* thread group exit support */ | |
625 | int group_exit_code; | |
626 | /* overloaded: | |
627 | * - notify group_exit_task when ->count is equal to notify_count | |
628 | * - everyone except group_exit_task is stopped during signal delivery | |
629 | * of fatal signals, group_exit_task processes the signal. | |
630 | */ | |
1da177e4 | 631 | int notify_count; |
07dd20e0 | 632 | struct task_struct *group_exit_task; |
1da177e4 LT |
633 | |
634 | /* thread group stop support, overloads group_exit_code too */ | |
635 | int group_stop_count; | |
636 | unsigned int flags; /* see SIGNAL_* flags below */ | |
637 | ||
ebec18a6 LP |
638 | /* |
639 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
640 | * manager, to re-parent orphan (double-forking) child processes | |
641 | * to this process instead of 'init'. The service manager is | |
642 | * able to receive SIGCHLD signals and is able to investigate | |
643 | * the process until it calls wait(). All children of this | |
644 | * process will inherit a flag if they should look for a | |
645 | * child_subreaper process at exit. | |
646 | */ | |
647 | unsigned int is_child_subreaper:1; | |
648 | unsigned int has_child_subreaper:1; | |
649 | ||
1da177e4 | 650 | /* POSIX.1b Interval Timers */ |
5ed67f05 PE |
651 | int posix_timer_id; |
652 | struct list_head posix_timers; | |
1da177e4 LT |
653 | |
654 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 655 | struct hrtimer real_timer; |
fea9d175 | 656 | struct pid *leader_pid; |
2ff678b8 | 657 | ktime_t it_real_incr; |
1da177e4 | 658 | |
42c4ab41 SG |
659 | /* |
660 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
661 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
662 | * values are defined to 0 and 1 respectively | |
663 | */ | |
664 | struct cpu_itimer it[2]; | |
1da177e4 | 665 | |
f06febc9 | 666 | /* |
4cd4c1b4 PZ |
667 | * Thread group totals for process CPU timers. |
668 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 669 | */ |
4cd4c1b4 | 670 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
671 | |
672 | /* Earliest-expiration cache. */ | |
673 | struct task_cputime cputime_expires; | |
674 | ||
675 | struct list_head cpu_timers[3]; | |
676 | ||
ab521dc0 | 677 | struct pid *tty_old_pgrp; |
1ec320af | 678 | |
1da177e4 LT |
679 | /* boolean value for session group leader */ |
680 | int leader; | |
681 | ||
682 | struct tty_struct *tty; /* NULL if no tty */ | |
683 | ||
5091faa4 MG |
684 | #ifdef CONFIG_SCHED_AUTOGROUP |
685 | struct autogroup *autogroup; | |
686 | #endif | |
1da177e4 LT |
687 | /* |
688 | * Cumulative resource counters for dead threads in the group, | |
689 | * and for reaped dead child processes forked by this group. | |
690 | * Live threads maintain their own counters and add to these | |
691 | * in __exit_signal, except for the group leader. | |
692 | */ | |
e78c3496 | 693 | seqlock_t stats_lock; |
32bd671d | 694 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
695 | cputime_t gtime; |
696 | cputime_t cgtime; | |
9fbc42ea | 697 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 698 | struct cputime prev_cputime; |
0cf55e1e | 699 | #endif |
1da177e4 LT |
700 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
701 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 702 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 703 | unsigned long maxrss, cmaxrss; |
940389b8 | 704 | struct task_io_accounting ioac; |
1da177e4 | 705 | |
32bd671d PZ |
706 | /* |
707 | * Cumulative ns of schedule CPU time fo dead threads in the | |
708 | * group, not including a zombie group leader, (This only differs | |
709 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
710 | * other than jiffies.) | |
711 | */ | |
712 | unsigned long long sum_sched_runtime; | |
713 | ||
1da177e4 LT |
714 | /* |
715 | * We don't bother to synchronize most readers of this at all, | |
716 | * because there is no reader checking a limit that actually needs | |
717 | * to get both rlim_cur and rlim_max atomically, and either one | |
718 | * alone is a single word that can safely be read normally. | |
719 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
720 | * protect this instead of the siglock, because they really | |
721 | * have no need to disable irqs. | |
722 | */ | |
723 | struct rlimit rlim[RLIM_NLIMITS]; | |
724 | ||
0e464814 KK |
725 | #ifdef CONFIG_BSD_PROCESS_ACCT |
726 | struct pacct_struct pacct; /* per-process accounting information */ | |
727 | #endif | |
ad4ecbcb | 728 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
729 | struct taskstats *stats; |
730 | #endif | |
522ed776 MT |
731 | #ifdef CONFIG_AUDIT |
732 | unsigned audit_tty; | |
46e959ea | 733 | unsigned audit_tty_log_passwd; |
522ed776 MT |
734 | struct tty_audit_buf *tty_audit_buf; |
735 | #endif | |
4714d1d3 BB |
736 | #ifdef CONFIG_CGROUPS |
737 | /* | |
77e4ef99 TH |
738 | * group_rwsem prevents new tasks from entering the threadgroup and |
739 | * member tasks from exiting,a more specifically, setting of | |
740 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
741 | * using threadgroup_change_begin/end(). Users which require | |
742 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
743 | * which also takes care of exec path. Currently, cgroup is the | |
744 | * only user. | |
4714d1d3 | 745 | */ |
257058ae | 746 | struct rw_semaphore group_rwsem; |
4714d1d3 | 747 | #endif |
28b83c51 | 748 | |
e1e12d2f | 749 | oom_flags_t oom_flags; |
a9c58b90 DR |
750 | short oom_score_adj; /* OOM kill score adjustment */ |
751 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
752 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
753 | |
754 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
755 | * credential calculations | |
756 | * (notably. ptrace) */ | |
1da177e4 LT |
757 | }; |
758 | ||
759 | /* | |
760 | * Bits in flags field of signal_struct. | |
761 | */ | |
762 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
763 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
764 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
403bad72 | 765 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ |
e4420551 ON |
766 | /* |
767 | * Pending notifications to parent. | |
768 | */ | |
769 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
770 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
771 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 772 | |
fae5fa44 ON |
773 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
774 | ||
ed5d2cac ON |
775 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
776 | static inline int signal_group_exit(const struct signal_struct *sig) | |
777 | { | |
778 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
779 | (sig->group_exit_task != NULL); | |
780 | } | |
781 | ||
1da177e4 LT |
782 | /* |
783 | * Some day this will be a full-fledged user tracking system.. | |
784 | */ | |
785 | struct user_struct { | |
786 | atomic_t __count; /* reference count */ | |
787 | atomic_t processes; /* How many processes does this user have? */ | |
1da177e4 | 788 | atomic_t sigpending; /* How many pending signals does this user have? */ |
2d9048e2 | 789 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
790 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
791 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
792 | #endif | |
4afeff85 EP |
793 | #ifdef CONFIG_FANOTIFY |
794 | atomic_t fanotify_listeners; | |
795 | #endif | |
7ef9964e | 796 | #ifdef CONFIG_EPOLL |
52bd19f7 | 797 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 798 | #endif |
970a8645 | 799 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
800 | /* protected by mq_lock */ |
801 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 802 | #endif |
1da177e4 LT |
803 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
804 | ||
805 | #ifdef CONFIG_KEYS | |
806 | struct key *uid_keyring; /* UID specific keyring */ | |
807 | struct key *session_keyring; /* UID's default session keyring */ | |
808 | #endif | |
809 | ||
810 | /* Hash table maintenance information */ | |
735de223 | 811 | struct hlist_node uidhash_node; |
7b44ab97 | 812 | kuid_t uid; |
24e377a8 | 813 | |
cdd6c482 | 814 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
815 | atomic_long_t locked_vm; |
816 | #endif | |
1da177e4 LT |
817 | }; |
818 | ||
eb41d946 | 819 | extern int uids_sysfs_init(void); |
5cb350ba | 820 | |
7b44ab97 | 821 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
822 | |
823 | extern struct user_struct root_user; | |
824 | #define INIT_USER (&root_user) | |
825 | ||
b6dff3ec | 826 | |
1da177e4 LT |
827 | struct backing_dev_info; |
828 | struct reclaim_state; | |
829 | ||
52f17b6c | 830 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
831 | struct sched_info { |
832 | /* cumulative counters */ | |
2d72376b | 833 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 834 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
835 | |
836 | /* timestamps */ | |
172ba844 BS |
837 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
838 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 839 | }; |
52f17b6c | 840 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 841 | |
ca74e92b SN |
842 | #ifdef CONFIG_TASK_DELAY_ACCT |
843 | struct task_delay_info { | |
844 | spinlock_t lock; | |
845 | unsigned int flags; /* Private per-task flags */ | |
846 | ||
847 | /* For each stat XXX, add following, aligned appropriately | |
848 | * | |
849 | * struct timespec XXX_start, XXX_end; | |
850 | * u64 XXX_delay; | |
851 | * u32 XXX_count; | |
852 | * | |
853 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
854 | * single lock above (split into XXX_lock if contention is an issue). | |
855 | */ | |
0ff92245 SN |
856 | |
857 | /* | |
858 | * XXX_count is incremented on every XXX operation, the delay | |
859 | * associated with the operation is added to XXX_delay. | |
860 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
861 | */ | |
9667a23d | 862 | u64 blkio_start; /* Shared by blkio, swapin */ |
0ff92245 SN |
863 | u64 blkio_delay; /* wait for sync block io completion */ |
864 | u64 swapin_delay; /* wait for swapin block io completion */ | |
865 | u32 blkio_count; /* total count of the number of sync block */ | |
866 | /* io operations performed */ | |
867 | u32 swapin_count; /* total count of the number of swapin block */ | |
868 | /* io operations performed */ | |
873b4771 | 869 | |
9667a23d | 870 | u64 freepages_start; |
873b4771 KK |
871 | u64 freepages_delay; /* wait for memory reclaim */ |
872 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 873 | }; |
52f17b6c CS |
874 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
875 | ||
876 | static inline int sched_info_on(void) | |
877 | { | |
878 | #ifdef CONFIG_SCHEDSTATS | |
879 | return 1; | |
880 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
881 | extern int delayacct_on; | |
882 | return delayacct_on; | |
883 | #else | |
884 | return 0; | |
ca74e92b | 885 | #endif |
52f17b6c | 886 | } |
ca74e92b | 887 | |
d15bcfdb IM |
888 | enum cpu_idle_type { |
889 | CPU_IDLE, | |
890 | CPU_NOT_IDLE, | |
891 | CPU_NEWLY_IDLE, | |
892 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
893 | }; |
894 | ||
1399fa78 | 895 | /* |
ca8ce3d0 | 896 | * Increase resolution of cpu_capacity calculations |
1399fa78 | 897 | */ |
ca8ce3d0 NP |
898 | #define SCHED_CAPACITY_SHIFT 10 |
899 | #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
1da177e4 | 900 | |
1399fa78 NR |
901 | /* |
902 | * sched-domains (multiprocessor balancing) declarations: | |
903 | */ | |
2dd73a4f | 904 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
905 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
906 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
907 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
908 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 909 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 910 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
5d4dfddd | 911 | #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */ |
d77b3ed5 | 912 | #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ |
b5d978e0 PZ |
913 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
914 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 915 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 916 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 917 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
3a7053b3 | 918 | #define SD_NUMA 0x4000 /* cross-node balancing */ |
5c45bf27 | 919 | |
143e1e28 | 920 | #ifdef CONFIG_SCHED_SMT |
b6220ad6 | 921 | static inline int cpu_smt_flags(void) |
143e1e28 | 922 | { |
5d4dfddd | 923 | return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; |
143e1e28 VG |
924 | } |
925 | #endif | |
926 | ||
927 | #ifdef CONFIG_SCHED_MC | |
b6220ad6 | 928 | static inline int cpu_core_flags(void) |
143e1e28 VG |
929 | { |
930 | return SD_SHARE_PKG_RESOURCES; | |
931 | } | |
932 | #endif | |
933 | ||
934 | #ifdef CONFIG_NUMA | |
b6220ad6 | 935 | static inline int cpu_numa_flags(void) |
143e1e28 VG |
936 | { |
937 | return SD_NUMA; | |
938 | } | |
939 | #endif | |
532cb4c4 | 940 | |
1d3504fc HS |
941 | struct sched_domain_attr { |
942 | int relax_domain_level; | |
943 | }; | |
944 | ||
945 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
946 | .relax_domain_level = -1, \ | |
947 | } | |
948 | ||
60495e77 PZ |
949 | extern int sched_domain_level_max; |
950 | ||
5e6521ea LZ |
951 | struct sched_group; |
952 | ||
1da177e4 LT |
953 | struct sched_domain { |
954 | /* These fields must be setup */ | |
955 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 956 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 957 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
958 | unsigned long min_interval; /* Minimum balance interval ms */ |
959 | unsigned long max_interval; /* Maximum balance interval ms */ | |
960 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
961 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 962 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
963 | unsigned int busy_idx; |
964 | unsigned int idle_idx; | |
965 | unsigned int newidle_idx; | |
966 | unsigned int wake_idx; | |
147cbb4b | 967 | unsigned int forkexec_idx; |
a52bfd73 | 968 | unsigned int smt_gain; |
25f55d9d VG |
969 | |
970 | int nohz_idle; /* NOHZ IDLE status */ | |
1da177e4 | 971 | int flags; /* See SD_* */ |
60495e77 | 972 | int level; |
1da177e4 LT |
973 | |
974 | /* Runtime fields. */ | |
975 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
976 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
977 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
978 | ||
f48627e6 | 979 | /* idle_balance() stats */ |
9bd721c5 | 980 | u64 max_newidle_lb_cost; |
f48627e6 | 981 | unsigned long next_decay_max_lb_cost; |
2398f2c6 | 982 | |
1da177e4 LT |
983 | #ifdef CONFIG_SCHEDSTATS |
984 | /* load_balance() stats */ | |
480b9434 KC |
985 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
986 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
987 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
988 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
989 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
990 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
991 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
992 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
993 | |
994 | /* Active load balancing */ | |
480b9434 KC |
995 | unsigned int alb_count; |
996 | unsigned int alb_failed; | |
997 | unsigned int alb_pushed; | |
1da177e4 | 998 | |
68767a0a | 999 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
1000 | unsigned int sbe_count; |
1001 | unsigned int sbe_balanced; | |
1002 | unsigned int sbe_pushed; | |
1da177e4 | 1003 | |
68767a0a | 1004 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
1005 | unsigned int sbf_count; |
1006 | unsigned int sbf_balanced; | |
1007 | unsigned int sbf_pushed; | |
68767a0a | 1008 | |
1da177e4 | 1009 | /* try_to_wake_up() stats */ |
480b9434 KC |
1010 | unsigned int ttwu_wake_remote; |
1011 | unsigned int ttwu_move_affine; | |
1012 | unsigned int ttwu_move_balance; | |
1da177e4 | 1013 | #endif |
a5d8c348 IM |
1014 | #ifdef CONFIG_SCHED_DEBUG |
1015 | char *name; | |
1016 | #endif | |
dce840a0 PZ |
1017 | union { |
1018 | void *private; /* used during construction */ | |
1019 | struct rcu_head rcu; /* used during destruction */ | |
1020 | }; | |
6c99e9ad | 1021 | |
669c55e9 | 1022 | unsigned int span_weight; |
4200efd9 IM |
1023 | /* |
1024 | * Span of all CPUs in this domain. | |
1025 | * | |
1026 | * NOTE: this field is variable length. (Allocated dynamically | |
1027 | * by attaching extra space to the end of the structure, | |
1028 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
1029 | */ |
1030 | unsigned long span[0]; | |
1da177e4 LT |
1031 | }; |
1032 | ||
758b2cdc RR |
1033 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
1034 | { | |
6c99e9ad | 1035 | return to_cpumask(sd->span); |
758b2cdc RR |
1036 | } |
1037 | ||
acc3f5d7 | 1038 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 1039 | struct sched_domain_attr *dattr_new); |
029190c5 | 1040 | |
acc3f5d7 RR |
1041 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
1042 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1043 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1044 | ||
39be3501 PZ |
1045 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1046 | ||
143e1e28 | 1047 | typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); |
b6220ad6 | 1048 | typedef int (*sched_domain_flags_f)(void); |
143e1e28 VG |
1049 | |
1050 | #define SDTL_OVERLAP 0x01 | |
1051 | ||
1052 | struct sd_data { | |
1053 | struct sched_domain **__percpu sd; | |
1054 | struct sched_group **__percpu sg; | |
63b2ca30 | 1055 | struct sched_group_capacity **__percpu sgc; |
143e1e28 VG |
1056 | }; |
1057 | ||
1058 | struct sched_domain_topology_level { | |
1059 | sched_domain_mask_f mask; | |
1060 | sched_domain_flags_f sd_flags; | |
1061 | int flags; | |
1062 | int numa_level; | |
1063 | struct sd_data data; | |
1064 | #ifdef CONFIG_SCHED_DEBUG | |
1065 | char *name; | |
1066 | #endif | |
1067 | }; | |
1068 | ||
1069 | extern struct sched_domain_topology_level *sched_domain_topology; | |
1070 | ||
1071 | extern void set_sched_topology(struct sched_domain_topology_level *tl); | |
f6be8af1 | 1072 | extern void wake_up_if_idle(int cpu); |
143e1e28 VG |
1073 | |
1074 | #ifdef CONFIG_SCHED_DEBUG | |
1075 | # define SD_INIT_NAME(type) .name = #type | |
1076 | #else | |
1077 | # define SD_INIT_NAME(type) | |
1078 | #endif | |
1079 | ||
1b427c15 | 1080 | #else /* CONFIG_SMP */ |
1da177e4 | 1081 | |
1b427c15 | 1082 | struct sched_domain_attr; |
d02c7a8c | 1083 | |
1b427c15 | 1084 | static inline void |
acc3f5d7 | 1085 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1086 | struct sched_domain_attr *dattr_new) |
1087 | { | |
d02c7a8c | 1088 | } |
39be3501 PZ |
1089 | |
1090 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1091 | { | |
1092 | return true; | |
1093 | } | |
1094 | ||
1b427c15 | 1095 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1096 | |
47fe38fc | 1097 | |
1da177e4 | 1098 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1099 | |
1da177e4 | 1100 | |
383f2835 | 1101 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1102 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
1103 | #else |
1104 | static inline void prefetch_stack(struct task_struct *t) { } | |
1105 | #endif | |
1da177e4 LT |
1106 | |
1107 | struct audit_context; /* See audit.c */ | |
1108 | struct mempolicy; | |
b92ce558 | 1109 | struct pipe_inode_info; |
4865ecf1 | 1110 | struct uts_namespace; |
1da177e4 | 1111 | |
20b8a59f | 1112 | struct load_weight { |
9dbdb155 PZ |
1113 | unsigned long weight; |
1114 | u32 inv_weight; | |
20b8a59f IM |
1115 | }; |
1116 | ||
9d85f21c PT |
1117 | struct sched_avg { |
1118 | /* | |
1119 | * These sums represent an infinite geometric series and so are bound | |
239003ea | 1120 | * above by 1024/(1-y). Thus we only need a u32 to store them for all |
9d85f21c PT |
1121 | * choices of y < 1-2^(-32)*1024. |
1122 | */ | |
1123 | u32 runnable_avg_sum, runnable_avg_period; | |
1124 | u64 last_runnable_update; | |
9ee474f5 | 1125 | s64 decay_count; |
2dac754e | 1126 | unsigned long load_avg_contrib; |
9d85f21c PT |
1127 | }; |
1128 | ||
94c18227 | 1129 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1130 | struct sched_statistics { |
20b8a59f | 1131 | u64 wait_start; |
94c18227 | 1132 | u64 wait_max; |
6d082592 AV |
1133 | u64 wait_count; |
1134 | u64 wait_sum; | |
8f0dfc34 AV |
1135 | u64 iowait_count; |
1136 | u64 iowait_sum; | |
94c18227 | 1137 | |
20b8a59f | 1138 | u64 sleep_start; |
20b8a59f | 1139 | u64 sleep_max; |
94c18227 IM |
1140 | s64 sum_sleep_runtime; |
1141 | ||
1142 | u64 block_start; | |
20b8a59f IM |
1143 | u64 block_max; |
1144 | u64 exec_max; | |
eba1ed4b | 1145 | u64 slice_max; |
cc367732 | 1146 | |
cc367732 IM |
1147 | u64 nr_migrations_cold; |
1148 | u64 nr_failed_migrations_affine; | |
1149 | u64 nr_failed_migrations_running; | |
1150 | u64 nr_failed_migrations_hot; | |
1151 | u64 nr_forced_migrations; | |
cc367732 IM |
1152 | |
1153 | u64 nr_wakeups; | |
1154 | u64 nr_wakeups_sync; | |
1155 | u64 nr_wakeups_migrate; | |
1156 | u64 nr_wakeups_local; | |
1157 | u64 nr_wakeups_remote; | |
1158 | u64 nr_wakeups_affine; | |
1159 | u64 nr_wakeups_affine_attempts; | |
1160 | u64 nr_wakeups_passive; | |
1161 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1162 | }; |
1163 | #endif | |
1164 | ||
1165 | struct sched_entity { | |
1166 | struct load_weight load; /* for load-balancing */ | |
1167 | struct rb_node run_node; | |
1168 | struct list_head group_node; | |
1169 | unsigned int on_rq; | |
1170 | ||
1171 | u64 exec_start; | |
1172 | u64 sum_exec_runtime; | |
1173 | u64 vruntime; | |
1174 | u64 prev_sum_exec_runtime; | |
1175 | ||
41acab88 LDM |
1176 | u64 nr_migrations; |
1177 | ||
41acab88 LDM |
1178 | #ifdef CONFIG_SCHEDSTATS |
1179 | struct sched_statistics statistics; | |
94c18227 IM |
1180 | #endif |
1181 | ||
20b8a59f | 1182 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 1183 | int depth; |
20b8a59f IM |
1184 | struct sched_entity *parent; |
1185 | /* rq on which this entity is (to be) queued: */ | |
1186 | struct cfs_rq *cfs_rq; | |
1187 | /* rq "owned" by this entity/group: */ | |
1188 | struct cfs_rq *my_q; | |
1189 | #endif | |
8bd75c77 | 1190 | |
141965c7 | 1191 | #ifdef CONFIG_SMP |
f4e26b12 | 1192 | /* Per-entity load-tracking */ |
9d85f21c PT |
1193 | struct sched_avg avg; |
1194 | #endif | |
20b8a59f | 1195 | }; |
70b97a7f | 1196 | |
fa717060 PZ |
1197 | struct sched_rt_entity { |
1198 | struct list_head run_list; | |
78f2c7db | 1199 | unsigned long timeout; |
57d2aa00 | 1200 | unsigned long watchdog_stamp; |
bee367ed | 1201 | unsigned int time_slice; |
6f505b16 | 1202 | |
58d6c2d7 | 1203 | struct sched_rt_entity *back; |
052f1dc7 | 1204 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1205 | struct sched_rt_entity *parent; |
1206 | /* rq on which this entity is (to be) queued: */ | |
1207 | struct rt_rq *rt_rq; | |
1208 | /* rq "owned" by this entity/group: */ | |
1209 | struct rt_rq *my_q; | |
1210 | #endif | |
fa717060 PZ |
1211 | }; |
1212 | ||
aab03e05 DF |
1213 | struct sched_dl_entity { |
1214 | struct rb_node rb_node; | |
1215 | ||
1216 | /* | |
1217 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 1218 | * during sched_setattr(), they will remain the same until |
1219 | * the next sched_setattr(). | |
aab03e05 DF |
1220 | */ |
1221 | u64 dl_runtime; /* maximum runtime for each instance */ | |
1222 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 1223 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 1224 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
1225 | |
1226 | /* | |
1227 | * Actual scheduling parameters. Initialized with the values above, | |
1228 | * they are continously updated during task execution. Note that | |
1229 | * the remaining runtime could be < 0 in case we are in overrun. | |
1230 | */ | |
1231 | s64 runtime; /* remaining runtime for this instance */ | |
1232 | u64 deadline; /* absolute deadline for this instance */ | |
1233 | unsigned int flags; /* specifying the scheduler behaviour */ | |
1234 | ||
1235 | /* | |
1236 | * Some bool flags: | |
1237 | * | |
1238 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
1239 | * task has to wait for a replenishment to be performed at the | |
1240 | * next firing of dl_timer. | |
1241 | * | |
1242 | * @dl_new tells if a new instance arrived. If so we must | |
1243 | * start executing it with full runtime and reset its absolute | |
1244 | * deadline; | |
2d3d891d DF |
1245 | * |
1246 | * @dl_boosted tells if we are boosted due to DI. If so we are | |
1247 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
1248 | * exit the critical section); |
1249 | * | |
1250 | * @dl_yielded tells if task gave up the cpu before consuming | |
1251 | * all its available runtime during the last job. | |
aab03e05 | 1252 | */ |
5bfd126e | 1253 | int dl_throttled, dl_new, dl_boosted, dl_yielded; |
aab03e05 DF |
1254 | |
1255 | /* | |
1256 | * Bandwidth enforcement timer. Each -deadline task has its | |
1257 | * own bandwidth to be enforced, thus we need one timer per task. | |
1258 | */ | |
1259 | struct hrtimer dl_timer; | |
1260 | }; | |
8bd75c77 | 1261 | |
1d082fd0 PM |
1262 | union rcu_special { |
1263 | struct { | |
1264 | bool blocked; | |
1265 | bool need_qs; | |
1266 | } b; | |
1267 | short s; | |
1268 | }; | |
86848966 PM |
1269 | struct rcu_node; |
1270 | ||
8dc85d54 PZ |
1271 | enum perf_event_task_context { |
1272 | perf_invalid_context = -1, | |
1273 | perf_hw_context = 0, | |
89a1e187 | 1274 | perf_sw_context, |
8dc85d54 PZ |
1275 | perf_nr_task_contexts, |
1276 | }; | |
1277 | ||
1da177e4 LT |
1278 | struct task_struct { |
1279 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1280 | void *stack; |
1da177e4 | 1281 | atomic_t usage; |
97dc32cd WC |
1282 | unsigned int flags; /* per process flags, defined below */ |
1283 | unsigned int ptrace; | |
1da177e4 | 1284 | |
2dd73a4f | 1285 | #ifdef CONFIG_SMP |
fa14ff4a | 1286 | struct llist_node wake_entry; |
3ca7a440 | 1287 | int on_cpu; |
62470419 MW |
1288 | struct task_struct *last_wakee; |
1289 | unsigned long wakee_flips; | |
1290 | unsigned long wakee_flip_decay_ts; | |
ac66f547 PZ |
1291 | |
1292 | int wake_cpu; | |
2dd73a4f | 1293 | #endif |
fd2f4419 | 1294 | int on_rq; |
50e645a8 | 1295 | |
b29739f9 | 1296 | int prio, static_prio, normal_prio; |
c7aceaba | 1297 | unsigned int rt_priority; |
5522d5d5 | 1298 | const struct sched_class *sched_class; |
20b8a59f | 1299 | struct sched_entity se; |
fa717060 | 1300 | struct sched_rt_entity rt; |
8323f26c PZ |
1301 | #ifdef CONFIG_CGROUP_SCHED |
1302 | struct task_group *sched_task_group; | |
1303 | #endif | |
aab03e05 | 1304 | struct sched_dl_entity dl; |
1da177e4 | 1305 | |
e107be36 AK |
1306 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1307 | /* list of struct preempt_notifier: */ | |
1308 | struct hlist_head preempt_notifiers; | |
1309 | #endif | |
1310 | ||
6c5c9341 | 1311 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1312 | unsigned int btrace_seq; |
6c5c9341 | 1313 | #endif |
1da177e4 | 1314 | |
97dc32cd | 1315 | unsigned int policy; |
29baa747 | 1316 | int nr_cpus_allowed; |
1da177e4 | 1317 | cpumask_t cpus_allowed; |
1da177e4 | 1318 | |
a57eb940 | 1319 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1320 | int rcu_read_lock_nesting; |
1d082fd0 | 1321 | union rcu_special rcu_read_unlock_special; |
f41d911f | 1322 | struct list_head rcu_node_entry; |
a57eb940 | 1323 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
28f6569a | 1324 | #ifdef CONFIG_PREEMPT_RCU |
a57eb940 | 1325 | struct rcu_node *rcu_blocked_node; |
28f6569a | 1326 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
8315f422 PM |
1327 | #ifdef CONFIG_TASKS_RCU |
1328 | unsigned long rcu_tasks_nvcsw; | |
1329 | bool rcu_tasks_holdout; | |
1330 | struct list_head rcu_tasks_holdout_list; | |
176f8f7a | 1331 | int rcu_tasks_idle_cpu; |
8315f422 | 1332 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 1333 | |
52f17b6c | 1334 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1335 | struct sched_info sched_info; |
1336 | #endif | |
1337 | ||
1338 | struct list_head tasks; | |
806c09a7 | 1339 | #ifdef CONFIG_SMP |
917b627d | 1340 | struct plist_node pushable_tasks; |
1baca4ce | 1341 | struct rb_node pushable_dl_tasks; |
806c09a7 | 1342 | #endif |
1da177e4 LT |
1343 | |
1344 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1345 | #ifdef CONFIG_COMPAT_BRK |
1346 | unsigned brk_randomized:1; | |
1347 | #endif | |
615d6e87 DB |
1348 | /* per-thread vma caching */ |
1349 | u32 vmacache_seqnum; | |
1350 | struct vm_area_struct *vmacache[VMACACHE_SIZE]; | |
34e55232 KH |
1351 | #if defined(SPLIT_RSS_COUNTING) |
1352 | struct task_rss_stat rss_stat; | |
1353 | #endif | |
1da177e4 | 1354 | /* task state */ |
97dc32cd | 1355 | int exit_state; |
1da177e4 LT |
1356 | int exit_code, exit_signal; |
1357 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1358 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
1359 | |
1360 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 1361 | unsigned int personality; |
9b89f6ba | 1362 | |
f9ce1f1c KT |
1363 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1364 | * execve */ | |
8f0dfc34 AV |
1365 | unsigned in_iowait:1; |
1366 | ||
ca94c442 LP |
1367 | /* Revert to default priority/policy when forking */ |
1368 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1369 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1370 | |
6f185c29 VD |
1371 | #ifdef CONFIG_MEMCG_KMEM |
1372 | unsigned memcg_kmem_skip_account:1; | |
1373 | #endif | |
1374 | ||
1d4457f9 KC |
1375 | unsigned long atomic_flags; /* Flags needing atomic access. */ |
1376 | ||
f56141e3 AL |
1377 | struct restart_block restart_block; |
1378 | ||
1da177e4 LT |
1379 | pid_t pid; |
1380 | pid_t tgid; | |
0a425405 | 1381 | |
1314562a | 1382 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1383 | /* Canary value for the -fstack-protector gcc feature */ |
1384 | unsigned long stack_canary; | |
1314562a | 1385 | #endif |
4d1d61a6 | 1386 | /* |
1da177e4 | 1387 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1388 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1389 | * p->real_parent->pid) |
1da177e4 | 1390 | */ |
abd63bc3 KC |
1391 | struct task_struct __rcu *real_parent; /* real parent process */ |
1392 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1393 | /* |
f470021a | 1394 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1395 | */ |
1396 | struct list_head children; /* list of my children */ | |
1397 | struct list_head sibling; /* linkage in my parent's children list */ | |
1398 | struct task_struct *group_leader; /* threadgroup leader */ | |
1399 | ||
f470021a RM |
1400 | /* |
1401 | * ptraced is the list of tasks this task is using ptrace on. | |
1402 | * This includes both natural children and PTRACE_ATTACH targets. | |
1403 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1404 | */ | |
1405 | struct list_head ptraced; | |
1406 | struct list_head ptrace_entry; | |
1407 | ||
1da177e4 | 1408 | /* PID/PID hash table linkage. */ |
92476d7f | 1409 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1410 | struct list_head thread_group; |
0c740d0a | 1411 | struct list_head thread_node; |
1da177e4 LT |
1412 | |
1413 | struct completion *vfork_done; /* for vfork() */ | |
1414 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1415 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1416 | ||
c66f08be | 1417 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1418 | cputime_t gtime; |
9fbc42ea | 1419 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 1420 | struct cputime prev_cputime; |
6a61671b FW |
1421 | #endif |
1422 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | |
1423 | seqlock_t vtime_seqlock; | |
1424 | unsigned long long vtime_snap; | |
1425 | enum { | |
1426 | VTIME_SLEEPING = 0, | |
1427 | VTIME_USER, | |
1428 | VTIME_SYS, | |
1429 | } vtime_snap_whence; | |
d99ca3b9 | 1430 | #endif |
1da177e4 | 1431 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
ccbf62d8 | 1432 | u64 start_time; /* monotonic time in nsec */ |
57e0be04 | 1433 | u64 real_start_time; /* boot based time in nsec */ |
1da177e4 LT |
1434 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1435 | unsigned long min_flt, maj_flt; | |
1436 | ||
f06febc9 | 1437 | struct task_cputime cputime_expires; |
1da177e4 LT |
1438 | struct list_head cpu_timers[3]; |
1439 | ||
1440 | /* process credentials */ | |
1b0ba1c9 | 1441 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1442 | * credentials (COW) */ |
1b0ba1c9 | 1443 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1444 | * credentials (COW) */ |
36772092 PBG |
1445 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1446 | - access with [gs]et_task_comm (which lock | |
1447 | it with task_lock()) | |
221af7f8 | 1448 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1449 | /* file system info */ |
1450 | int link_count, total_link_count; | |
3d5b6fcc | 1451 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1452 | /* ipc stuff */ |
1453 | struct sysv_sem sysvsem; | |
ab602f79 | 1454 | struct sysv_shm sysvshm; |
3d5b6fcc | 1455 | #endif |
e162b39a | 1456 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1457 | /* hung task detection */ |
82a1fcb9 IM |
1458 | unsigned long last_switch_count; |
1459 | #endif | |
1da177e4 LT |
1460 | /* CPU-specific state of this task */ |
1461 | struct thread_struct thread; | |
1462 | /* filesystem information */ | |
1463 | struct fs_struct *fs; | |
1464 | /* open file information */ | |
1465 | struct files_struct *files; | |
1651e14e | 1466 | /* namespaces */ |
ab516013 | 1467 | struct nsproxy *nsproxy; |
1da177e4 LT |
1468 | /* signal handlers */ |
1469 | struct signal_struct *signal; | |
1470 | struct sighand_struct *sighand; | |
1471 | ||
1472 | sigset_t blocked, real_blocked; | |
f3de272b | 1473 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1474 | struct sigpending pending; |
1475 | ||
1476 | unsigned long sas_ss_sp; | |
1477 | size_t sas_ss_size; | |
1478 | int (*notifier)(void *priv); | |
1479 | void *notifier_data; | |
1480 | sigset_t *notifier_mask; | |
67d12145 | 1481 | struct callback_head *task_works; |
e73f8959 | 1482 | |
1da177e4 | 1483 | struct audit_context *audit_context; |
bfef93a5 | 1484 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1485 | kuid_t loginuid; |
4746ec5b | 1486 | unsigned int sessionid; |
bfef93a5 | 1487 | #endif |
932ecebb | 1488 | struct seccomp seccomp; |
1da177e4 LT |
1489 | |
1490 | /* Thread group tracking */ | |
1491 | u32 parent_exec_id; | |
1492 | u32 self_exec_id; | |
58568d2a MX |
1493 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1494 | * mempolicy */ | |
1da177e4 | 1495 | spinlock_t alloc_lock; |
1da177e4 | 1496 | |
b29739f9 | 1497 | /* Protection of the PI data structures: */ |
1d615482 | 1498 | raw_spinlock_t pi_lock; |
b29739f9 | 1499 | |
23f78d4a IM |
1500 | #ifdef CONFIG_RT_MUTEXES |
1501 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
1502 | struct rb_root pi_waiters; |
1503 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
1504 | /* Deadlock detection and priority inheritance handling */ |
1505 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1506 | #endif |
1507 | ||
408894ee IM |
1508 | #ifdef CONFIG_DEBUG_MUTEXES |
1509 | /* mutex deadlock detection */ | |
1510 | struct mutex_waiter *blocked_on; | |
1511 | #endif | |
de30a2b3 IM |
1512 | #ifdef CONFIG_TRACE_IRQFLAGS |
1513 | unsigned int irq_events; | |
de30a2b3 | 1514 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1515 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1516 | unsigned int hardirq_enable_event; |
de30a2b3 | 1517 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1518 | int hardirqs_enabled; |
1519 | int hardirq_context; | |
de30a2b3 | 1520 | unsigned long softirq_disable_ip; |
de30a2b3 | 1521 | unsigned long softirq_enable_ip; |
fa1452e8 | 1522 | unsigned int softirq_disable_event; |
de30a2b3 | 1523 | unsigned int softirq_enable_event; |
fa1452e8 | 1524 | int softirqs_enabled; |
de30a2b3 IM |
1525 | int softirq_context; |
1526 | #endif | |
fbb9ce95 | 1527 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1528 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1529 | u64 curr_chain_key; |
1530 | int lockdep_depth; | |
fbb9ce95 | 1531 | unsigned int lockdep_recursion; |
c7aceaba | 1532 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1533 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1534 | #endif |
408894ee | 1535 | |
1da177e4 LT |
1536 | /* journalling filesystem info */ |
1537 | void *journal_info; | |
1538 | ||
d89d8796 | 1539 | /* stacked block device info */ |
bddd87c7 | 1540 | struct bio_list *bio_list; |
d89d8796 | 1541 | |
73c10101 JA |
1542 | #ifdef CONFIG_BLOCK |
1543 | /* stack plugging */ | |
1544 | struct blk_plug *plug; | |
1545 | #endif | |
1546 | ||
1da177e4 LT |
1547 | /* VM state */ |
1548 | struct reclaim_state *reclaim_state; | |
1549 | ||
1da177e4 LT |
1550 | struct backing_dev_info *backing_dev_info; |
1551 | ||
1552 | struct io_context *io_context; | |
1553 | ||
1554 | unsigned long ptrace_message; | |
1555 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1556 | struct task_io_accounting ioac; |
8f0ab514 | 1557 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1558 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1559 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1560 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1561 | #endif |
1562 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1563 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1564 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1565 | int cpuset_mem_spread_rotor; |
6adef3eb | 1566 | int cpuset_slab_spread_rotor; |
1da177e4 | 1567 | #endif |
ddbcc7e8 | 1568 | #ifdef CONFIG_CGROUPS |
817929ec | 1569 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1570 | struct css_set __rcu *cgroups; |
817929ec PM |
1571 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1572 | struct list_head cg_list; | |
ddbcc7e8 | 1573 | #endif |
42b2dd0a | 1574 | #ifdef CONFIG_FUTEX |
0771dfef | 1575 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1576 | #ifdef CONFIG_COMPAT |
1577 | struct compat_robust_list_head __user *compat_robust_list; | |
1578 | #endif | |
c87e2837 IM |
1579 | struct list_head pi_state_list; |
1580 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1581 | #endif |
cdd6c482 | 1582 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1583 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1584 | struct mutex perf_event_mutex; |
1585 | struct list_head perf_event_list; | |
a63eaf34 | 1586 | #endif |
8f47b187 TG |
1587 | #ifdef CONFIG_DEBUG_PREEMPT |
1588 | unsigned long preempt_disable_ip; | |
1589 | #endif | |
c7aceaba | 1590 | #ifdef CONFIG_NUMA |
58568d2a | 1591 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1592 | short il_next; |
207205a2 | 1593 | short pref_node_fork; |
42b2dd0a | 1594 | #endif |
cbee9f88 PZ |
1595 | #ifdef CONFIG_NUMA_BALANCING |
1596 | int numa_scan_seq; | |
cbee9f88 | 1597 | unsigned int numa_scan_period; |
598f0ec0 | 1598 | unsigned int numa_scan_period_max; |
de1c9ce6 | 1599 | int numa_preferred_nid; |
6b9a7460 | 1600 | unsigned long numa_migrate_retry; |
cbee9f88 | 1601 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
1602 | u64 last_task_numa_placement; |
1603 | u64 last_sum_exec_runtime; | |
cbee9f88 | 1604 | struct callback_head numa_work; |
f809ca9a | 1605 | |
8c8a743c PZ |
1606 | struct list_head numa_entry; |
1607 | struct numa_group *numa_group; | |
1608 | ||
745d6147 | 1609 | /* |
44dba3d5 IM |
1610 | * numa_faults is an array split into four regions: |
1611 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1612 | * in this precise order. | |
1613 | * | |
1614 | * faults_memory: Exponential decaying average of faults on a per-node | |
1615 | * basis. Scheduling placement decisions are made based on these | |
1616 | * counts. The values remain static for the duration of a PTE scan. | |
1617 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1618 | * hinting fault was incurred. | |
1619 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1620 | * during the current scan window. When the scan completes, the counts | |
1621 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1622 | */ |
44dba3d5 | 1623 | unsigned long *numa_faults; |
83e1d2cd | 1624 | unsigned long total_numa_faults; |
745d6147 | 1625 | |
04bb2f94 RR |
1626 | /* |
1627 | * numa_faults_locality tracks if faults recorded during the last | |
1628 | * scan window were remote/local. The task scan period is adapted | |
1629 | * based on the locality of the faults with different weights | |
1630 | * depending on whether they were shared or private faults | |
1631 | */ | |
1632 | unsigned long numa_faults_locality[2]; | |
1633 | ||
b32e86b4 | 1634 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1635 | #endif /* CONFIG_NUMA_BALANCING */ |
1636 | ||
e56d0903 | 1637 | struct rcu_head rcu; |
b92ce558 JA |
1638 | |
1639 | /* | |
1640 | * cache last used pipe for splice | |
1641 | */ | |
1642 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1643 | |
1644 | struct page_frag task_frag; | |
1645 | ||
ca74e92b SN |
1646 | #ifdef CONFIG_TASK_DELAY_ACCT |
1647 | struct task_delay_info *delays; | |
f4f154fd AM |
1648 | #endif |
1649 | #ifdef CONFIG_FAULT_INJECTION | |
1650 | int make_it_fail; | |
ca74e92b | 1651 | #endif |
9d823e8f WF |
1652 | /* |
1653 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1654 | * balance_dirty_pages() for some dirty throttling pause | |
1655 | */ | |
1656 | int nr_dirtied; | |
1657 | int nr_dirtied_pause; | |
83712358 | 1658 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1659 | |
9745512c AV |
1660 | #ifdef CONFIG_LATENCYTOP |
1661 | int latency_record_count; | |
1662 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1663 | #endif | |
6976675d AV |
1664 | /* |
1665 | * time slack values; these are used to round up poll() and | |
1666 | * select() etc timeout values. These are in nanoseconds. | |
1667 | */ | |
1668 | unsigned long timer_slack_ns; | |
1669 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1670 | |
0b24becc AR |
1671 | #ifdef CONFIG_KASAN |
1672 | unsigned int kasan_depth; | |
1673 | #endif | |
fb52607a | 1674 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1675 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1676 | int curr_ret_stack; |
1677 | /* Stack of return addresses for return function tracing */ | |
1678 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1679 | /* time stamp for last schedule */ |
1680 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1681 | /* |
1682 | * Number of functions that haven't been traced | |
1683 | * because of depth overrun. | |
1684 | */ | |
1685 | atomic_t trace_overrun; | |
380c4b14 FW |
1686 | /* Pause for the tracing */ |
1687 | atomic_t tracing_graph_pause; | |
f201ae23 | 1688 | #endif |
ea4e2bc4 SR |
1689 | #ifdef CONFIG_TRACING |
1690 | /* state flags for use by tracers */ | |
1691 | unsigned long trace; | |
b1cff0ad | 1692 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1693 | unsigned long trace_recursion; |
1694 | #endif /* CONFIG_TRACING */ | |
6f185c29 | 1695 | #ifdef CONFIG_MEMCG |
519e5247 | 1696 | struct memcg_oom_info { |
49426420 JW |
1697 | struct mem_cgroup *memcg; |
1698 | gfp_t gfp_mask; | |
1699 | int order; | |
519e5247 JW |
1700 | unsigned int may_oom:1; |
1701 | } memcg_oom; | |
569b846d | 1702 | #endif |
0326f5a9 SD |
1703 | #ifdef CONFIG_UPROBES |
1704 | struct uprobe_task *utask; | |
0326f5a9 | 1705 | #endif |
cafe5635 KO |
1706 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1707 | unsigned int sequential_io; | |
1708 | unsigned int sequential_io_avg; | |
1709 | #endif | |
8eb23b9f PZ |
1710 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1711 | unsigned long task_state_change; | |
1712 | #endif | |
1da177e4 LT |
1713 | }; |
1714 | ||
76e6eee0 | 1715 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1716 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1717 | |
6688cc05 PZ |
1718 | #define TNF_MIGRATED 0x01 |
1719 | #define TNF_NO_GROUP 0x02 | |
dabe1d99 | 1720 | #define TNF_SHARED 0x04 |
04bb2f94 | 1721 | #define TNF_FAULT_LOCAL 0x08 |
6688cc05 | 1722 | |
cbee9f88 | 1723 | #ifdef CONFIG_NUMA_BALANCING |
6688cc05 | 1724 | extern void task_numa_fault(int last_node, int node, int pages, int flags); |
e29cf08b | 1725 | extern pid_t task_numa_group_id(struct task_struct *p); |
1a687c2e | 1726 | extern void set_numabalancing_state(bool enabled); |
82727018 | 1727 | extern void task_numa_free(struct task_struct *p); |
10f39042 RR |
1728 | extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page, |
1729 | int src_nid, int dst_cpu); | |
cbee9f88 | 1730 | #else |
ac8e895b | 1731 | static inline void task_numa_fault(int last_node, int node, int pages, |
6688cc05 | 1732 | int flags) |
cbee9f88 PZ |
1733 | { |
1734 | } | |
e29cf08b MG |
1735 | static inline pid_t task_numa_group_id(struct task_struct *p) |
1736 | { | |
1737 | return 0; | |
1738 | } | |
1a687c2e MG |
1739 | static inline void set_numabalancing_state(bool enabled) |
1740 | { | |
1741 | } | |
82727018 RR |
1742 | static inline void task_numa_free(struct task_struct *p) |
1743 | { | |
1744 | } | |
10f39042 RR |
1745 | static inline bool should_numa_migrate_memory(struct task_struct *p, |
1746 | struct page *page, int src_nid, int dst_cpu) | |
1747 | { | |
1748 | return true; | |
1749 | } | |
cbee9f88 PZ |
1750 | #endif |
1751 | ||
e868171a | 1752 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1753 | { |
1754 | return task->pids[PIDTYPE_PID].pid; | |
1755 | } | |
1756 | ||
e868171a | 1757 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1758 | { |
1759 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1760 | } | |
1761 | ||
6dda81f4 ON |
1762 | /* |
1763 | * Without tasklist or rcu lock it is not safe to dereference | |
1764 | * the result of task_pgrp/task_session even if task == current, | |
1765 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1766 | */ | |
e868171a | 1767 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1768 | { |
1769 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1770 | } | |
1771 | ||
e868171a | 1772 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1773 | { |
1774 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1775 | } | |
1776 | ||
7af57294 PE |
1777 | struct pid_namespace; |
1778 | ||
1779 | /* | |
1780 | * the helpers to get the task's different pids as they are seen | |
1781 | * from various namespaces | |
1782 | * | |
1783 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1784 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1785 | * current. | |
7af57294 PE |
1786 | * task_xid_nr_ns() : id seen from the ns specified; |
1787 | * | |
1788 | * set_task_vxid() : assigns a virtual id to a task; | |
1789 | * | |
7af57294 PE |
1790 | * see also pid_nr() etc in include/linux/pid.h |
1791 | */ | |
52ee2dfd ON |
1792 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1793 | struct pid_namespace *ns); | |
7af57294 | 1794 | |
e868171a | 1795 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1796 | { |
1797 | return tsk->pid; | |
1798 | } | |
1799 | ||
52ee2dfd ON |
1800 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1801 | struct pid_namespace *ns) | |
1802 | { | |
1803 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1804 | } | |
7af57294 PE |
1805 | |
1806 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1807 | { | |
52ee2dfd | 1808 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1809 | } |
1810 | ||
1811 | ||
e868171a | 1812 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1813 | { |
1814 | return tsk->tgid; | |
1815 | } | |
1816 | ||
2f2a3a46 | 1817 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1818 | |
1819 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1820 | { | |
1821 | return pid_vnr(task_tgid(tsk)); | |
1822 | } | |
1823 | ||
1824 | ||
80e0b6e8 | 1825 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1826 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1827 | { | |
1828 | pid_t pid = 0; | |
1829 | ||
1830 | rcu_read_lock(); | |
1831 | if (pid_alive(tsk)) | |
1832 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1833 | rcu_read_unlock(); | |
1834 | ||
1835 | return pid; | |
1836 | } | |
1837 | ||
1838 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1839 | { | |
1840 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1841 | } | |
1842 | ||
52ee2dfd ON |
1843 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1844 | struct pid_namespace *ns) | |
7af57294 | 1845 | { |
52ee2dfd | 1846 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1847 | } |
1848 | ||
7af57294 PE |
1849 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1850 | { | |
52ee2dfd | 1851 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1852 | } |
1853 | ||
1854 | ||
52ee2dfd ON |
1855 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1856 | struct pid_namespace *ns) | |
7af57294 | 1857 | { |
52ee2dfd | 1858 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1859 | } |
1860 | ||
7af57294 PE |
1861 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1862 | { | |
52ee2dfd | 1863 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1864 | } |
1865 | ||
1b0f7ffd ON |
1866 | /* obsolete, do not use */ |
1867 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1868 | { | |
1869 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1870 | } | |
7af57294 | 1871 | |
1da177e4 LT |
1872 | /** |
1873 | * pid_alive - check that a task structure is not stale | |
1874 | * @p: Task structure to be checked. | |
1875 | * | |
1876 | * Test if a process is not yet dead (at most zombie state) | |
1877 | * If pid_alive fails, then pointers within the task structure | |
1878 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1879 | * |
1880 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1881 | */ |
ad36d282 | 1882 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 1883 | { |
92476d7f | 1884 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1885 | } |
1886 | ||
f400e198 | 1887 | /** |
b460cbc5 | 1888 | * is_global_init - check if a task structure is init |
3260259f HK |
1889 | * @tsk: Task structure to be checked. |
1890 | * | |
1891 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1892 | * |
1893 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1894 | */ |
e868171a | 1895 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1896 | { |
1897 | return tsk->pid == 1; | |
1898 | } | |
b460cbc5 | 1899 | |
9ec52099 CLG |
1900 | extern struct pid *cad_pid; |
1901 | ||
1da177e4 | 1902 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1903 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1904 | |
158d9ebd | 1905 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1906 | |
1907 | static inline void put_task_struct(struct task_struct *t) | |
1908 | { | |
1909 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1910 | __put_task_struct(t); |
e56d0903 | 1911 | } |
1da177e4 | 1912 | |
6a61671b FW |
1913 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1914 | extern void task_cputime(struct task_struct *t, | |
1915 | cputime_t *utime, cputime_t *stime); | |
1916 | extern void task_cputime_scaled(struct task_struct *t, | |
1917 | cputime_t *utimescaled, cputime_t *stimescaled); | |
1918 | extern cputime_t task_gtime(struct task_struct *t); | |
1919 | #else | |
6fac4829 FW |
1920 | static inline void task_cputime(struct task_struct *t, |
1921 | cputime_t *utime, cputime_t *stime) | |
1922 | { | |
1923 | if (utime) | |
1924 | *utime = t->utime; | |
1925 | if (stime) | |
1926 | *stime = t->stime; | |
1927 | } | |
1928 | ||
1929 | static inline void task_cputime_scaled(struct task_struct *t, | |
1930 | cputime_t *utimescaled, | |
1931 | cputime_t *stimescaled) | |
1932 | { | |
1933 | if (utimescaled) | |
1934 | *utimescaled = t->utimescaled; | |
1935 | if (stimescaled) | |
1936 | *stimescaled = t->stimescaled; | |
1937 | } | |
6a61671b FW |
1938 | |
1939 | static inline cputime_t task_gtime(struct task_struct *t) | |
1940 | { | |
1941 | return t->gtime; | |
1942 | } | |
1943 | #endif | |
e80d0a1a FW |
1944 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1945 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 1946 | |
1da177e4 LT |
1947 | /* |
1948 | * Per process flags | |
1949 | */ | |
1da177e4 | 1950 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1951 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1952 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1953 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1954 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1955 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1956 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1957 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1958 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1959 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1960 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1961 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 1962 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
1963 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1964 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1965 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1966 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 1967 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 1968 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1969 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1970 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1971 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
14a40ffc | 1972 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 1973 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 1974 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1975 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 1976 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
1977 | |
1978 | /* | |
1979 | * Only the _current_ task can read/write to tsk->flags, but other | |
1980 | * tasks can access tsk->flags in readonly mode for example | |
1981 | * with tsk_used_math (like during threaded core dumping). | |
1982 | * There is however an exception to this rule during ptrace | |
1983 | * or during fork: the ptracer task is allowed to write to the | |
1984 | * child->flags of its traced child (same goes for fork, the parent | |
1985 | * can write to the child->flags), because we're guaranteed the | |
1986 | * child is not running and in turn not changing child->flags | |
1987 | * at the same time the parent does it. | |
1988 | */ | |
1989 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1990 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1991 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1992 | #define set_used_math() set_stopped_child_used_math(current) | |
1993 | #define conditional_stopped_child_used_math(condition, child) \ | |
1994 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1995 | #define conditional_used_math(condition) \ | |
1996 | conditional_stopped_child_used_math(condition, current) | |
1997 | #define copy_to_stopped_child_used_math(child) \ | |
1998 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1999 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
2000 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
2001 | #define used_math() tsk_used_math(current) | |
2002 | ||
934f3072 JB |
2003 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags |
2004 | * __GFP_FS is also cleared as it implies __GFP_IO. | |
2005 | */ | |
21caf2fc ML |
2006 | static inline gfp_t memalloc_noio_flags(gfp_t flags) |
2007 | { | |
2008 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
934f3072 | 2009 | flags &= ~(__GFP_IO | __GFP_FS); |
21caf2fc ML |
2010 | return flags; |
2011 | } | |
2012 | ||
2013 | static inline unsigned int memalloc_noio_save(void) | |
2014 | { | |
2015 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
2016 | current->flags |= PF_MEMALLOC_NOIO; | |
2017 | return flags; | |
2018 | } | |
2019 | ||
2020 | static inline void memalloc_noio_restore(unsigned int flags) | |
2021 | { | |
2022 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
2023 | } | |
2024 | ||
1d4457f9 | 2025 | /* Per-process atomic flags. */ |
a2b86f77 | 2026 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
2ad654bc ZL |
2027 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ |
2028 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
2029 | ||
1d4457f9 | 2030 | |
e0e5070b ZL |
2031 | #define TASK_PFA_TEST(name, func) \ |
2032 | static inline bool task_##func(struct task_struct *p) \ | |
2033 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
2034 | #define TASK_PFA_SET(name, func) \ | |
2035 | static inline void task_set_##func(struct task_struct *p) \ | |
2036 | { set_bit(PFA_##name, &p->atomic_flags); } | |
2037 | #define TASK_PFA_CLEAR(name, func) \ | |
2038 | static inline void task_clear_##func(struct task_struct *p) \ | |
2039 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
2040 | ||
2041 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
2042 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 2043 | |
2ad654bc ZL |
2044 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
2045 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
2046 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
2047 | ||
2048 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
2049 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
2050 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 2051 | |
e5c1902e | 2052 | /* |
a8f072c1 | 2053 | * task->jobctl flags |
e5c1902e | 2054 | */ |
a8f072c1 | 2055 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 2056 | |
a8f072c1 TH |
2057 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
2058 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
2059 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 2060 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 2061 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 2062 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 2063 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
2064 | |
2065 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
2066 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
2067 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 2068 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 2069 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 2070 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 2071 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 2072 | |
fb1d910c | 2073 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 2074 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 2075 | |
7dd3db54 TH |
2076 | extern bool task_set_jobctl_pending(struct task_struct *task, |
2077 | unsigned int mask); | |
73ddff2b | 2078 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
2079 | extern void task_clear_jobctl_pending(struct task_struct *task, |
2080 | unsigned int mask); | |
39efa3ef | 2081 | |
f41d911f PM |
2082 | static inline void rcu_copy_process(struct task_struct *p) |
2083 | { | |
8315f422 | 2084 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f | 2085 | p->rcu_read_lock_nesting = 0; |
1d082fd0 | 2086 | p->rcu_read_unlock_special.s = 0; |
dd5d19ba | 2087 | p->rcu_blocked_node = NULL; |
f41d911f | 2088 | INIT_LIST_HEAD(&p->rcu_node_entry); |
8315f422 PM |
2089 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
2090 | #ifdef CONFIG_TASKS_RCU | |
2091 | p->rcu_tasks_holdout = false; | |
2092 | INIT_LIST_HEAD(&p->rcu_tasks_holdout_list); | |
176f8f7a | 2093 | p->rcu_tasks_idle_cpu = -1; |
8315f422 | 2094 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
f41d911f PM |
2095 | } |
2096 | ||
907aed48 MG |
2097 | static inline void tsk_restore_flags(struct task_struct *task, |
2098 | unsigned long orig_flags, unsigned long flags) | |
2099 | { | |
2100 | task->flags &= ~flags; | |
2101 | task->flags |= orig_flags & flags; | |
2102 | } | |
2103 | ||
f82f8042 JL |
2104 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, |
2105 | const struct cpumask *trial); | |
7f51412a JL |
2106 | extern int task_can_attach(struct task_struct *p, |
2107 | const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 2108 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
2109 | extern void do_set_cpus_allowed(struct task_struct *p, |
2110 | const struct cpumask *new_mask); | |
2111 | ||
cd8ba7cd | 2112 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2113 | const struct cpumask *new_mask); |
1da177e4 | 2114 | #else |
1e1b6c51 KM |
2115 | static inline void do_set_cpus_allowed(struct task_struct *p, |
2116 | const struct cpumask *new_mask) | |
2117 | { | |
2118 | } | |
cd8ba7cd | 2119 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2120 | const struct cpumask *new_mask) |
1da177e4 | 2121 | { |
96f874e2 | 2122 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
2123 | return -EINVAL; |
2124 | return 0; | |
2125 | } | |
2126 | #endif | |
e0ad9556 | 2127 | |
3451d024 | 2128 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
2129 | void calc_load_enter_idle(void); |
2130 | void calc_load_exit_idle(void); | |
2131 | #else | |
2132 | static inline void calc_load_enter_idle(void) { } | |
2133 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 2134 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 2135 | |
e0ad9556 | 2136 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
2137 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
2138 | { | |
2139 | return set_cpus_allowed_ptr(p, &new_mask); | |
2140 | } | |
e0ad9556 | 2141 | #endif |
1da177e4 | 2142 | |
b342501c | 2143 | /* |
c676329a PZ |
2144 | * Do not use outside of architecture code which knows its limitations. |
2145 | * | |
2146 | * sched_clock() has no promise of monotonicity or bounded drift between | |
2147 | * CPUs, use (which you should not) requires disabling IRQs. | |
2148 | * | |
2149 | * Please use one of the three interfaces below. | |
b342501c | 2150 | */ |
1bbfa6f2 | 2151 | extern unsigned long long notrace sched_clock(void); |
c676329a | 2152 | /* |
489a71b0 | 2153 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
2154 | */ |
2155 | extern u64 cpu_clock(int cpu); | |
2156 | extern u64 local_clock(void); | |
545a2bf7 | 2157 | extern u64 running_clock(void); |
c676329a PZ |
2158 | extern u64 sched_clock_cpu(int cpu); |
2159 | ||
e436d800 | 2160 | |
c1955a3d | 2161 | extern void sched_clock_init(void); |
3e51f33f | 2162 | |
c1955a3d | 2163 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
2164 | static inline void sched_clock_tick(void) |
2165 | { | |
2166 | } | |
2167 | ||
2168 | static inline void sched_clock_idle_sleep_event(void) | |
2169 | { | |
2170 | } | |
2171 | ||
2172 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
2173 | { | |
2174 | } | |
2175 | #else | |
c676329a PZ |
2176 | /* |
2177 | * Architectures can set this to 1 if they have specified | |
2178 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
2179 | * but then during bootup it turns out that sched_clock() | |
2180 | * is reliable after all: | |
2181 | */ | |
35af99e6 PZ |
2182 | extern int sched_clock_stable(void); |
2183 | extern void set_sched_clock_stable(void); | |
2184 | extern void clear_sched_clock_stable(void); | |
c676329a | 2185 | |
3e51f33f PZ |
2186 | extern void sched_clock_tick(void); |
2187 | extern void sched_clock_idle_sleep_event(void); | |
2188 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
2189 | #endif | |
2190 | ||
b52bfee4 VP |
2191 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
2192 | /* | |
2193 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
2194 | * The reason for this explicit opt-in is not to have perf penalty with | |
2195 | * slow sched_clocks. | |
2196 | */ | |
2197 | extern void enable_sched_clock_irqtime(void); | |
2198 | extern void disable_sched_clock_irqtime(void); | |
2199 | #else | |
2200 | static inline void enable_sched_clock_irqtime(void) {} | |
2201 | static inline void disable_sched_clock_irqtime(void) {} | |
2202 | #endif | |
2203 | ||
36c8b586 | 2204 | extern unsigned long long |
41b86e9c | 2205 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2206 | |
2207 | /* sched_exec is called by processes performing an exec */ | |
2208 | #ifdef CONFIG_SMP | |
2209 | extern void sched_exec(void); | |
2210 | #else | |
2211 | #define sched_exec() {} | |
2212 | #endif | |
2213 | ||
2aa44d05 IM |
2214 | extern void sched_clock_idle_sleep_event(void); |
2215 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2216 | |
1da177e4 LT |
2217 | #ifdef CONFIG_HOTPLUG_CPU |
2218 | extern void idle_task_exit(void); | |
2219 | #else | |
2220 | static inline void idle_task_exit(void) {} | |
2221 | #endif | |
2222 | ||
3451d024 | 2223 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 2224 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 2225 | #else |
1c20091e | 2226 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
2227 | #endif |
2228 | ||
ce831b38 FW |
2229 | #ifdef CONFIG_NO_HZ_FULL |
2230 | extern bool sched_can_stop_tick(void); | |
265f22a9 | 2231 | extern u64 scheduler_tick_max_deferment(void); |
ce831b38 FW |
2232 | #else |
2233 | static inline bool sched_can_stop_tick(void) { return false; } | |
06d8308c TG |
2234 | #endif |
2235 | ||
5091faa4 | 2236 | #ifdef CONFIG_SCHED_AUTOGROUP |
5091faa4 MG |
2237 | extern void sched_autogroup_create_attach(struct task_struct *p); |
2238 | extern void sched_autogroup_detach(struct task_struct *p); | |
2239 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2240 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2241 | #ifdef CONFIG_PROC_FS | |
2242 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2243 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2244 | #endif |
2245 | #else | |
2246 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2247 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2248 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2249 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2250 | #endif | |
2251 | ||
fa93384f | 2252 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2253 | extern void set_user_nice(struct task_struct *p, long nice); |
2254 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
2255 | /** |
2256 | * task_nice - return the nice value of a given task. | |
2257 | * @p: the task in question. | |
2258 | * | |
2259 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
2260 | */ | |
2261 | static inline int task_nice(const struct task_struct *p) | |
2262 | { | |
2263 | return PRIO_TO_NICE((p)->static_prio); | |
2264 | } | |
36c8b586 IM |
2265 | extern int can_nice(const struct task_struct *p, const int nice); |
2266 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2267 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2268 | extern int sched_setscheduler(struct task_struct *, int, |
2269 | const struct sched_param *); | |
961ccddd | 2270 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2271 | const struct sched_param *); |
d50dde5a DF |
2272 | extern int sched_setattr(struct task_struct *, |
2273 | const struct sched_attr *); | |
36c8b586 | 2274 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2275 | /** |
2276 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2277 | * @p: the task in question. |
e69f6186 YB |
2278 | * |
2279 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 2280 | */ |
7061ca3b | 2281 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2282 | { |
2283 | return p->pid == 0; | |
2284 | } | |
36c8b586 IM |
2285 | extern struct task_struct *curr_task(int cpu); |
2286 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2287 | |
2288 | void yield(void); | |
2289 | ||
2290 | /* | |
2291 | * The default (Linux) execution domain. | |
2292 | */ | |
2293 | extern struct exec_domain default_exec_domain; | |
2294 | ||
2295 | union thread_union { | |
2296 | struct thread_info thread_info; | |
2297 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2298 | }; | |
2299 | ||
2300 | #ifndef __HAVE_ARCH_KSTACK_END | |
2301 | static inline int kstack_end(void *addr) | |
2302 | { | |
2303 | /* Reliable end of stack detection: | |
2304 | * Some APM bios versions misalign the stack | |
2305 | */ | |
2306 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2307 | } | |
2308 | #endif | |
2309 | ||
2310 | extern union thread_union init_thread_union; | |
2311 | extern struct task_struct init_task; | |
2312 | ||
2313 | extern struct mm_struct init_mm; | |
2314 | ||
198fe21b PE |
2315 | extern struct pid_namespace init_pid_ns; |
2316 | ||
2317 | /* | |
2318 | * find a task by one of its numerical ids | |
2319 | * | |
198fe21b PE |
2320 | * find_task_by_pid_ns(): |
2321 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2322 | * find_task_by_vpid(): |
2323 | * finds a task by its virtual pid | |
198fe21b | 2324 | * |
e49859e7 | 2325 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2326 | */ |
2327 | ||
228ebcbe PE |
2328 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2329 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2330 | struct pid_namespace *ns); | |
198fe21b | 2331 | |
1da177e4 | 2332 | /* per-UID process charging. */ |
7b44ab97 | 2333 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2334 | static inline struct user_struct *get_uid(struct user_struct *u) |
2335 | { | |
2336 | atomic_inc(&u->__count); | |
2337 | return u; | |
2338 | } | |
2339 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2340 | |
2341 | #include <asm/current.h> | |
2342 | ||
f0af911a | 2343 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2344 | |
b3c97528 HH |
2345 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2346 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2347 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2348 | #ifdef CONFIG_SMP |
2349 | extern void kick_process(struct task_struct *tsk); | |
2350 | #else | |
2351 | static inline void kick_process(struct task_struct *tsk) { } | |
2352 | #endif | |
aab03e05 | 2353 | extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
ad46c2c4 | 2354 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2355 | |
1da177e4 LT |
2356 | extern void proc_caches_init(void); |
2357 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2358 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2359 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2360 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2361 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2362 | ||
2363 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2364 | { | |
2365 | unsigned long flags; | |
2366 | int ret; | |
2367 | ||
2368 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2369 | ret = dequeue_signal(tsk, mask, info); | |
2370 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2371 | ||
2372 | return ret; | |
53c8f9f1 | 2373 | } |
1da177e4 LT |
2374 | |
2375 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2376 | sigset_t *mask); | |
2377 | extern void unblock_all_signals(void); | |
2378 | extern void release_task(struct task_struct * p); | |
2379 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2380 | extern int force_sigsegv(int, struct task_struct *); |
2381 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2382 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2383 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2384 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2385 | const struct cred *, u32); | |
c4b92fc1 EB |
2386 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2387 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2388 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2389 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2390 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2391 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2392 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2393 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2394 | extern struct sigqueue *sigqueue_alloc(void); |
2395 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2396 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2397 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 | 2398 | |
51a7b448 AV |
2399 | static inline void restore_saved_sigmask(void) |
2400 | { | |
2401 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2402 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2403 | } |
2404 | ||
b7f9a11a AV |
2405 | static inline sigset_t *sigmask_to_save(void) |
2406 | { | |
2407 | sigset_t *res = ¤t->blocked; | |
2408 | if (unlikely(test_restore_sigmask())) | |
2409 | res = ¤t->saved_sigmask; | |
2410 | return res; | |
2411 | } | |
2412 | ||
9ec52099 CLG |
2413 | static inline int kill_cad_pid(int sig, int priv) |
2414 | { | |
2415 | return kill_pid(cad_pid, sig, priv); | |
2416 | } | |
2417 | ||
1da177e4 LT |
2418 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2419 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2420 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2421 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2422 | ||
2a855dd0 SAS |
2423 | /* |
2424 | * True if we are on the alternate signal stack. | |
2425 | */ | |
1da177e4 LT |
2426 | static inline int on_sig_stack(unsigned long sp) |
2427 | { | |
2a855dd0 SAS |
2428 | #ifdef CONFIG_STACK_GROWSUP |
2429 | return sp >= current->sas_ss_sp && | |
2430 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2431 | #else | |
2432 | return sp > current->sas_ss_sp && | |
2433 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2434 | #endif | |
1da177e4 LT |
2435 | } |
2436 | ||
2437 | static inline int sas_ss_flags(unsigned long sp) | |
2438 | { | |
72f15c03 RW |
2439 | if (!current->sas_ss_size) |
2440 | return SS_DISABLE; | |
2441 | ||
2442 | return on_sig_stack(sp) ? SS_ONSTACK : 0; | |
1da177e4 LT |
2443 | } |
2444 | ||
5a1b98d3 AV |
2445 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) |
2446 | { | |
2447 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
2448 | #ifdef CONFIG_STACK_GROWSUP | |
2449 | return current->sas_ss_sp; | |
2450 | #else | |
2451 | return current->sas_ss_sp + current->sas_ss_size; | |
2452 | #endif | |
2453 | return sp; | |
2454 | } | |
2455 | ||
1da177e4 LT |
2456 | /* |
2457 | * Routines for handling mm_structs | |
2458 | */ | |
2459 | extern struct mm_struct * mm_alloc(void); | |
2460 | ||
2461 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2462 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2463 | static inline void mmdrop(struct mm_struct * mm) |
2464 | { | |
6fb43d7b | 2465 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2466 | __mmdrop(mm); |
2467 | } | |
2468 | ||
2469 | /* mmput gets rid of the mappings and all user-space */ | |
2470 | extern void mmput(struct mm_struct *); | |
2471 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2472 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2473 | /* |
2474 | * Grab a reference to a task's mm, if it is not already going away | |
2475 | * and ptrace_may_access with the mode parameter passed to it | |
2476 | * succeeds. | |
2477 | */ | |
2478 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2479 | /* Remove the current tasks stale references to the old mm_struct */ |
2480 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
2481 | ||
6f2c55b8 | 2482 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2483 | struct task_struct *); |
1da177e4 LT |
2484 | extern void flush_thread(void); |
2485 | extern void exit_thread(void); | |
2486 | ||
1da177e4 | 2487 | extern void exit_files(struct task_struct *); |
a7e5328a | 2488 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2489 | |
1da177e4 | 2490 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2491 | extern void flush_itimer_signals(void); |
1da177e4 | 2492 | |
9402c95f | 2493 | extern void do_group_exit(int); |
1da177e4 | 2494 | |
c4ad8f98 | 2495 | extern int do_execve(struct filename *, |
d7627467 | 2496 | const char __user * const __user *, |
da3d4c5f | 2497 | const char __user * const __user *); |
51f39a1f DD |
2498 | extern int do_execveat(int, struct filename *, |
2499 | const char __user * const __user *, | |
2500 | const char __user * const __user *, | |
2501 | int); | |
e80d6661 | 2502 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2503 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2504 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 | 2505 | |
82b89778 AH |
2506 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
2507 | static inline void set_task_comm(struct task_struct *tsk, const char *from) | |
2508 | { | |
2509 | __set_task_comm(tsk, from, false); | |
2510 | } | |
59714d65 | 2511 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2512 | |
2513 | #ifdef CONFIG_SMP | |
317f3941 | 2514 | void scheduler_ipi(void); |
85ba2d86 | 2515 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2516 | #else |
184748cc | 2517 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2518 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2519 | long match_state) | |
2520 | { | |
2521 | return 1; | |
2522 | } | |
1da177e4 LT |
2523 | #endif |
2524 | ||
05725f7e JP |
2525 | #define next_task(p) \ |
2526 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2527 | |
2528 | #define for_each_process(p) \ | |
2529 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2530 | ||
5bb459bb | 2531 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2532 | |
1da177e4 LT |
2533 | /* |
2534 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2535 | * 'break' will not work as expected - use goto instead. | |
2536 | */ | |
2537 | #define do_each_thread(g, t) \ | |
2538 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2539 | ||
2540 | #define while_each_thread(g, t) \ | |
2541 | while ((t = next_thread(t)) != g) | |
2542 | ||
0c740d0a ON |
2543 | #define __for_each_thread(signal, t) \ |
2544 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
2545 | ||
2546 | #define for_each_thread(p, t) \ | |
2547 | __for_each_thread((p)->signal, t) | |
2548 | ||
2549 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
2550 | #define for_each_process_thread(p, t) \ | |
2551 | for_each_process(p) for_each_thread(p, t) | |
2552 | ||
7e49827c ON |
2553 | static inline int get_nr_threads(struct task_struct *tsk) |
2554 | { | |
b3ac022c | 2555 | return tsk->signal->nr_threads; |
7e49827c ON |
2556 | } |
2557 | ||
087806b1 ON |
2558 | static inline bool thread_group_leader(struct task_struct *p) |
2559 | { | |
2560 | return p->exit_signal >= 0; | |
2561 | } | |
1da177e4 | 2562 | |
0804ef4b EB |
2563 | /* Do to the insanities of de_thread it is possible for a process |
2564 | * to have the pid of the thread group leader without actually being | |
2565 | * the thread group leader. For iteration through the pids in proc | |
2566 | * all we care about is that we have a task with the appropriate | |
2567 | * pid, we don't actually care if we have the right task. | |
2568 | */ | |
e1403b8e | 2569 | static inline bool has_group_leader_pid(struct task_struct *p) |
0804ef4b | 2570 | { |
e1403b8e | 2571 | return task_pid(p) == p->signal->leader_pid; |
0804ef4b EB |
2572 | } |
2573 | ||
bac0abd6 | 2574 | static inline |
e1403b8e | 2575 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) |
bac0abd6 | 2576 | { |
e1403b8e | 2577 | return p1->signal == p2->signal; |
bac0abd6 PE |
2578 | } |
2579 | ||
36c8b586 | 2580 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2581 | { |
05725f7e JP |
2582 | return list_entry_rcu(p->thread_group.next, |
2583 | struct task_struct, thread_group); | |
47e65328 ON |
2584 | } |
2585 | ||
e868171a | 2586 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2587 | { |
47e65328 | 2588 | return list_empty(&p->thread_group); |
1da177e4 LT |
2589 | } |
2590 | ||
2591 | #define delay_group_leader(p) \ | |
2592 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2593 | ||
1da177e4 | 2594 | /* |
260ea101 | 2595 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2596 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2597 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2598 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2599 | * |
2600 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2601 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2602 | * neither inside nor outside. | |
2603 | */ | |
2604 | static inline void task_lock(struct task_struct *p) | |
2605 | { | |
2606 | spin_lock(&p->alloc_lock); | |
2607 | } | |
2608 | ||
2609 | static inline void task_unlock(struct task_struct *p) | |
2610 | { | |
2611 | spin_unlock(&p->alloc_lock); | |
2612 | } | |
2613 | ||
b8ed374e | 2614 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2615 | unsigned long *flags); |
2616 | ||
9388dc30 AV |
2617 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2618 | unsigned long *flags) | |
2619 | { | |
2620 | struct sighand_struct *ret; | |
2621 | ||
2622 | ret = __lock_task_sighand(tsk, flags); | |
2623 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2624 | return ret; | |
2625 | } | |
b8ed374e | 2626 | |
f63ee72e ON |
2627 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2628 | unsigned long *flags) | |
2629 | { | |
2630 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2631 | } | |
2632 | ||
4714d1d3 | 2633 | #ifdef CONFIG_CGROUPS |
257058ae | 2634 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2635 | { |
257058ae | 2636 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2637 | } |
257058ae | 2638 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2639 | { |
257058ae | 2640 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2641 | } |
77e4ef99 TH |
2642 | |
2643 | /** | |
2644 | * threadgroup_lock - lock threadgroup | |
2645 | * @tsk: member task of the threadgroup to lock | |
2646 | * | |
2647 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2648 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
e56fb287 ON |
2649 | * change ->group_leader/pid. This is useful for cases where the threadgroup |
2650 | * needs to stay stable across blockable operations. | |
77e4ef99 TH |
2651 | * |
2652 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2653 | * synchronization. While held, no new task will be added to threadgroup | |
2654 | * and no existing live task will have its PF_EXITING set. | |
2655 | * | |
e56fb287 ON |
2656 | * de_thread() does threadgroup_change_{begin|end}() when a non-leader |
2657 | * sub-thread becomes a new leader. | |
77e4ef99 | 2658 | */ |
257058ae | 2659 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2660 | { |
257058ae | 2661 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2662 | } |
77e4ef99 TH |
2663 | |
2664 | /** | |
2665 | * threadgroup_unlock - unlock threadgroup | |
2666 | * @tsk: member task of the threadgroup to unlock | |
2667 | * | |
2668 | * Reverse threadgroup_lock(). | |
2669 | */ | |
257058ae | 2670 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2671 | { |
257058ae | 2672 | up_write(&tsk->signal->group_rwsem); |
4714d1d3 BB |
2673 | } |
2674 | #else | |
257058ae TH |
2675 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2676 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2677 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2678 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2679 | #endif |
2680 | ||
f037360f AV |
2681 | #ifndef __HAVE_THREAD_FUNCTIONS |
2682 | ||
f7e4217b RZ |
2683 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2684 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2685 | |
10ebffde AV |
2686 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2687 | { | |
2688 | *task_thread_info(p) = *task_thread_info(org); | |
2689 | task_thread_info(p)->task = p; | |
2690 | } | |
2691 | ||
6a40281a CE |
2692 | /* |
2693 | * Return the address of the last usable long on the stack. | |
2694 | * | |
2695 | * When the stack grows down, this is just above the thread | |
2696 | * info struct. Going any lower will corrupt the threadinfo. | |
2697 | * | |
2698 | * When the stack grows up, this is the highest address. | |
2699 | * Beyond that position, we corrupt data on the next page. | |
2700 | */ | |
10ebffde AV |
2701 | static inline unsigned long *end_of_stack(struct task_struct *p) |
2702 | { | |
6a40281a CE |
2703 | #ifdef CONFIG_STACK_GROWSUP |
2704 | return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1; | |
2705 | #else | |
f7e4217b | 2706 | return (unsigned long *)(task_thread_info(p) + 1); |
6a40281a | 2707 | #endif |
10ebffde AV |
2708 | } |
2709 | ||
f037360f | 2710 | #endif |
a70857e4 AT |
2711 | #define task_stack_end_corrupted(task) \ |
2712 | (*(end_of_stack(task)) != STACK_END_MAGIC) | |
f037360f | 2713 | |
8b05c7e6 FT |
2714 | static inline int object_is_on_stack(void *obj) |
2715 | { | |
2716 | void *stack = task_stack_page(current); | |
2717 | ||
2718 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2719 | } | |
2720 | ||
8c9843e5 BH |
2721 | extern void thread_info_cache_init(void); |
2722 | ||
7c9f8861 ES |
2723 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2724 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2725 | { | |
2726 | unsigned long *n = end_of_stack(p); | |
2727 | ||
2728 | do { /* Skip over canary */ | |
2729 | n++; | |
2730 | } while (!*n); | |
2731 | ||
2732 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2733 | } | |
2734 | #endif | |
d4311ff1 | 2735 | extern void set_task_stack_end_magic(struct task_struct *tsk); |
7c9f8861 | 2736 | |
1da177e4 LT |
2737 | /* set thread flags in other task's structures |
2738 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2739 | */ | |
2740 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2741 | { | |
a1261f54 | 2742 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2743 | } |
2744 | ||
2745 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2746 | { | |
a1261f54 | 2747 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2748 | } |
2749 | ||
2750 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2751 | { | |
a1261f54 | 2752 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2753 | } |
2754 | ||
2755 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2756 | { | |
a1261f54 | 2757 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2758 | } |
2759 | ||
2760 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2761 | { | |
a1261f54 | 2762 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2763 | } |
2764 | ||
2765 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2766 | { | |
2767 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2768 | } | |
2769 | ||
2770 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2771 | { | |
2772 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2773 | } | |
2774 | ||
8ae121ac GH |
2775 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2776 | { | |
2777 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2778 | } | |
2779 | ||
690cc3ff EB |
2780 | static inline int restart_syscall(void) |
2781 | { | |
2782 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2783 | return -ERESTARTNOINTR; | |
2784 | } | |
2785 | ||
1da177e4 LT |
2786 | static inline int signal_pending(struct task_struct *p) |
2787 | { | |
2788 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2789 | } | |
f776d12d | 2790 | |
d9588725 RM |
2791 | static inline int __fatal_signal_pending(struct task_struct *p) |
2792 | { | |
2793 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2794 | } | |
f776d12d MW |
2795 | |
2796 | static inline int fatal_signal_pending(struct task_struct *p) | |
2797 | { | |
2798 | return signal_pending(p) && __fatal_signal_pending(p); | |
2799 | } | |
2800 | ||
16882c1e ON |
2801 | static inline int signal_pending_state(long state, struct task_struct *p) |
2802 | { | |
2803 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2804 | return 0; | |
2805 | if (!signal_pending(p)) | |
2806 | return 0; | |
2807 | ||
16882c1e ON |
2808 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2809 | } | |
2810 | ||
1da177e4 LT |
2811 | /* |
2812 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2813 | * explicit rescheduling in places that are safe. The return | |
2814 | * value indicates whether a reschedule was done in fact. | |
2815 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2816 | * cond_resched_softirq() will enable bhs before scheduling. | |
2817 | */ | |
c3921ab7 | 2818 | extern int _cond_resched(void); |
6f80bd98 | 2819 | |
613afbf8 | 2820 | #define cond_resched() ({ \ |
3427445a | 2821 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2822 | _cond_resched(); \ |
2823 | }) | |
6f80bd98 | 2824 | |
613afbf8 FW |
2825 | extern int __cond_resched_lock(spinlock_t *lock); |
2826 | ||
bdd4e85d | 2827 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2828 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2829 | #else |
716a4234 | 2830 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2831 | #endif |
716a4234 | 2832 | |
613afbf8 | 2833 | #define cond_resched_lock(lock) ({ \ |
3427445a | 2834 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
2835 | __cond_resched_lock(lock); \ |
2836 | }) | |
2837 | ||
2838 | extern int __cond_resched_softirq(void); | |
2839 | ||
75e1056f | 2840 | #define cond_resched_softirq() ({ \ |
3427445a | 2841 | ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
75e1056f | 2842 | __cond_resched_softirq(); \ |
613afbf8 | 2843 | }) |
1da177e4 | 2844 | |
f6f3c437 SH |
2845 | static inline void cond_resched_rcu(void) |
2846 | { | |
2847 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2848 | rcu_read_unlock(); | |
2849 | cond_resched(); | |
2850 | rcu_read_lock(); | |
2851 | #endif | |
2852 | } | |
2853 | ||
1da177e4 LT |
2854 | /* |
2855 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2856 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2857 | * but a general need for low latency) | |
1da177e4 | 2858 | */ |
95c354fe | 2859 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2860 | { |
95c354fe NP |
2861 | #ifdef CONFIG_PREEMPT |
2862 | return spin_is_contended(lock); | |
2863 | #else | |
1da177e4 | 2864 | return 0; |
95c354fe | 2865 | #endif |
1da177e4 LT |
2866 | } |
2867 | ||
ee761f62 TG |
2868 | /* |
2869 | * Idle thread specific functions to determine the need_resched | |
69dd0f84 | 2870 | * polling state. |
ee761f62 | 2871 | */ |
69dd0f84 | 2872 | #ifdef TIF_POLLING_NRFLAG |
ee761f62 TG |
2873 | static inline int tsk_is_polling(struct task_struct *p) |
2874 | { | |
2875 | return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); | |
2876 | } | |
ea811747 PZ |
2877 | |
2878 | static inline void __current_set_polling(void) | |
3a98f871 TG |
2879 | { |
2880 | set_thread_flag(TIF_POLLING_NRFLAG); | |
2881 | } | |
2882 | ||
ea811747 PZ |
2883 | static inline bool __must_check current_set_polling_and_test(void) |
2884 | { | |
2885 | __current_set_polling(); | |
2886 | ||
2887 | /* | |
2888 | * Polling state must be visible before we test NEED_RESCHED, | |
8875125e | 2889 | * paired by resched_curr() |
ea811747 | 2890 | */ |
4e857c58 | 2891 | smp_mb__after_atomic(); |
ea811747 PZ |
2892 | |
2893 | return unlikely(tif_need_resched()); | |
2894 | } | |
2895 | ||
2896 | static inline void __current_clr_polling(void) | |
3a98f871 TG |
2897 | { |
2898 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
2899 | } | |
ea811747 PZ |
2900 | |
2901 | static inline bool __must_check current_clr_polling_and_test(void) | |
2902 | { | |
2903 | __current_clr_polling(); | |
2904 | ||
2905 | /* | |
2906 | * Polling state must be visible before we test NEED_RESCHED, | |
8875125e | 2907 | * paired by resched_curr() |
ea811747 | 2908 | */ |
4e857c58 | 2909 | smp_mb__after_atomic(); |
ea811747 PZ |
2910 | |
2911 | return unlikely(tif_need_resched()); | |
2912 | } | |
2913 | ||
ee761f62 TG |
2914 | #else |
2915 | static inline int tsk_is_polling(struct task_struct *p) { return 0; } | |
ea811747 PZ |
2916 | static inline void __current_set_polling(void) { } |
2917 | static inline void __current_clr_polling(void) { } | |
2918 | ||
2919 | static inline bool __must_check current_set_polling_and_test(void) | |
2920 | { | |
2921 | return unlikely(tif_need_resched()); | |
2922 | } | |
2923 | static inline bool __must_check current_clr_polling_and_test(void) | |
2924 | { | |
2925 | return unlikely(tif_need_resched()); | |
2926 | } | |
ee761f62 TG |
2927 | #endif |
2928 | ||
8cb75e0c PZ |
2929 | static inline void current_clr_polling(void) |
2930 | { | |
2931 | __current_clr_polling(); | |
2932 | ||
2933 | /* | |
2934 | * Ensure we check TIF_NEED_RESCHED after we clear the polling bit. | |
2935 | * Once the bit is cleared, we'll get IPIs with every new | |
2936 | * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also | |
2937 | * fold. | |
2938 | */ | |
8875125e | 2939 | smp_mb(); /* paired with resched_curr() */ |
8cb75e0c PZ |
2940 | |
2941 | preempt_fold_need_resched(); | |
2942 | } | |
2943 | ||
75f93fed PZ |
2944 | static __always_inline bool need_resched(void) |
2945 | { | |
2946 | return unlikely(tif_need_resched()); | |
2947 | } | |
2948 | ||
f06febc9 FM |
2949 | /* |
2950 | * Thread group CPU time accounting. | |
2951 | */ | |
4cd4c1b4 | 2952 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2953 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2954 | |
490dea45 | 2955 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2956 | { |
ee30a7b2 | 2957 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2958 | } |
2959 | ||
7bb44ade RM |
2960 | /* |
2961 | * Reevaluate whether the task has signals pending delivery. | |
2962 | * Wake the task if so. | |
2963 | * This is required every time the blocked sigset_t changes. | |
2964 | * callers must hold sighand->siglock. | |
2965 | */ | |
2966 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2967 | extern void recalc_sigpending(void); |
2968 | ||
910ffdb1 ON |
2969 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
2970 | ||
2971 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
2972 | { | |
2973 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
2974 | } | |
2975 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
2976 | { | |
2977 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
2978 | } | |
1da177e4 LT |
2979 | |
2980 | /* | |
2981 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2982 | */ | |
2983 | #ifdef CONFIG_SMP | |
2984 | ||
2985 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2986 | { | |
a1261f54 | 2987 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2988 | } |
2989 | ||
b32e86b4 IM |
2990 | static inline int task_node(const struct task_struct *p) |
2991 | { | |
2992 | return cpu_to_node(task_cpu(p)); | |
2993 | } | |
2994 | ||
c65cc870 | 2995 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2996 | |
2997 | #else | |
2998 | ||
2999 | static inline unsigned int task_cpu(const struct task_struct *p) | |
3000 | { | |
3001 | return 0; | |
3002 | } | |
3003 | ||
3004 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
3005 | { | |
3006 | } | |
3007 | ||
3008 | #endif /* CONFIG_SMP */ | |
3009 | ||
96f874e2 RR |
3010 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
3011 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 3012 | |
7c941438 | 3013 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 3014 | extern struct task_group root_task_group; |
8323f26c | 3015 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 3016 | |
54e99124 DG |
3017 | extern int task_can_switch_user(struct user_struct *up, |
3018 | struct task_struct *tsk); | |
3019 | ||
4b98d11b AD |
3020 | #ifdef CONFIG_TASK_XACCT |
3021 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
3022 | { | |
940389b8 | 3023 | tsk->ioac.rchar += amt; |
4b98d11b AD |
3024 | } |
3025 | ||
3026 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
3027 | { | |
940389b8 | 3028 | tsk->ioac.wchar += amt; |
4b98d11b AD |
3029 | } |
3030 | ||
3031 | static inline void inc_syscr(struct task_struct *tsk) | |
3032 | { | |
940389b8 | 3033 | tsk->ioac.syscr++; |
4b98d11b AD |
3034 | } |
3035 | ||
3036 | static inline void inc_syscw(struct task_struct *tsk) | |
3037 | { | |
940389b8 | 3038 | tsk->ioac.syscw++; |
4b98d11b AD |
3039 | } |
3040 | #else | |
3041 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
3042 | { | |
3043 | } | |
3044 | ||
3045 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
3046 | { | |
3047 | } | |
3048 | ||
3049 | static inline void inc_syscr(struct task_struct *tsk) | |
3050 | { | |
3051 | } | |
3052 | ||
3053 | static inline void inc_syscw(struct task_struct *tsk) | |
3054 | { | |
3055 | } | |
3056 | #endif | |
3057 | ||
82455257 DH |
3058 | #ifndef TASK_SIZE_OF |
3059 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
3060 | #endif | |
3061 | ||
f98bafa0 | 3062 | #ifdef CONFIG_MEMCG |
cf475ad2 | 3063 | extern void mm_update_next_owner(struct mm_struct *mm); |
cf475ad2 BS |
3064 | #else |
3065 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
3066 | { | |
3067 | } | |
f98bafa0 | 3068 | #endif /* CONFIG_MEMCG */ |
cf475ad2 | 3069 | |
3e10e716 JS |
3070 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
3071 | unsigned int limit) | |
3072 | { | |
3073 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
3074 | } | |
3075 | ||
3076 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
3077 | unsigned int limit) | |
3078 | { | |
3079 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
3080 | } | |
3081 | ||
3082 | static inline unsigned long rlimit(unsigned int limit) | |
3083 | { | |
3084 | return task_rlimit(current, limit); | |
3085 | } | |
3086 | ||
3087 | static inline unsigned long rlimit_max(unsigned int limit) | |
3088 | { | |
3089 | return task_rlimit_max(current, limit); | |
3090 | } | |
3091 | ||
1da177e4 | 3092 | #endif |