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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> | |
36 | #include <linux/signal.h> | |
1da177e4 LT |
37 | #include <linux/compiler.h> |
38 | #include <linux/completion.h> | |
39 | #include <linux/pid.h> | |
40 | #include <linux/percpu.h> | |
41 | #include <linux/topology.h> | |
3e26c149 | 42 | #include <linux/proportions.h> |
1da177e4 | 43 | #include <linux/seccomp.h> |
e56d0903 | 44 | #include <linux/rcupdate.h> |
05725f7e | 45 | #include <linux/rculist.h> |
23f78d4a | 46 | #include <linux/rtmutex.h> |
1da177e4 | 47 | |
a3b6714e DW |
48 | #include <linux/time.h> |
49 | #include <linux/param.h> | |
50 | #include <linux/resource.h> | |
51 | #include <linux/timer.h> | |
52 | #include <linux/hrtimer.h> | |
7c3ab738 | 53 | #include <linux/task_io_accounting.h> |
9745512c | 54 | #include <linux/latencytop.h> |
9e2b2dc4 | 55 | #include <linux/cred.h> |
fa14ff4a | 56 | #include <linux/llist.h> |
7b44ab97 | 57 | #include <linux/uidgid.h> |
21caf2fc | 58 | #include <linux/gfp.h> |
a3b6714e DW |
59 | |
60 | #include <asm/processor.h> | |
36d57ac4 | 61 | |
d50dde5a DF |
62 | #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */ |
63 | ||
64 | /* | |
65 | * Extended scheduling parameters data structure. | |
66 | * | |
67 | * This is needed because the original struct sched_param can not be | |
68 | * altered without introducing ABI issues with legacy applications | |
69 | * (e.g., in sched_getparam()). | |
70 | * | |
71 | * However, the possibility of specifying more than just a priority for | |
72 | * the tasks may be useful for a wide variety of application fields, e.g., | |
73 | * multimedia, streaming, automation and control, and many others. | |
74 | * | |
75 | * This variant (sched_attr) is meant at describing a so-called | |
76 | * sporadic time-constrained task. In such model a task is specified by: | |
77 | * - the activation period or minimum instance inter-arrival time; | |
78 | * - the maximum (or average, depending on the actual scheduling | |
79 | * discipline) computation time of all instances, a.k.a. runtime; | |
80 | * - the deadline (relative to the actual activation time) of each | |
81 | * instance. | |
82 | * Very briefly, a periodic (sporadic) task asks for the execution of | |
83 | * some specific computation --which is typically called an instance-- | |
84 | * (at most) every period. Moreover, each instance typically lasts no more | |
85 | * than the runtime and must be completed by time instant t equal to | |
86 | * the instance activation time + the deadline. | |
87 | * | |
88 | * This is reflected by the actual fields of the sched_attr structure: | |
89 | * | |
90 | * @size size of the structure, for fwd/bwd compat. | |
91 | * | |
92 | * @sched_policy task's scheduling policy | |
93 | * @sched_flags for customizing the scheduler behaviour | |
94 | * @sched_nice task's nice value (SCHED_NORMAL/BATCH) | |
95 | * @sched_priority task's static priority (SCHED_FIFO/RR) | |
96 | * @sched_deadline representative of the task's deadline | |
97 | * @sched_runtime representative of the task's runtime | |
98 | * @sched_period representative of the task's period | |
99 | * | |
100 | * Given this task model, there are a multiplicity of scheduling algorithms | |
101 | * and policies, that can be used to ensure all the tasks will make their | |
102 | * timing constraints. | |
aab03e05 DF |
103 | * |
104 | * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the | |
105 | * only user of this new interface. More information about the algorithm | |
106 | * available in the scheduling class file or in Documentation/. | |
d50dde5a DF |
107 | */ |
108 | struct sched_attr { | |
109 | u32 size; | |
110 | ||
111 | u32 sched_policy; | |
112 | u64 sched_flags; | |
113 | ||
114 | /* SCHED_NORMAL, SCHED_BATCH */ | |
115 | s32 sched_nice; | |
116 | ||
117 | /* SCHED_FIFO, SCHED_RR */ | |
118 | u32 sched_priority; | |
119 | ||
120 | /* SCHED_DEADLINE */ | |
121 | u64 sched_runtime; | |
122 | u64 sched_deadline; | |
123 | u64 sched_period; | |
124 | }; | |
125 | ||
1da177e4 | 126 | struct exec_domain; |
c87e2837 | 127 | struct futex_pi_state; |
286100a6 | 128 | struct robust_list_head; |
bddd87c7 | 129 | struct bio_list; |
5ad4e53b | 130 | struct fs_struct; |
cdd6c482 | 131 | struct perf_event_context; |
73c10101 | 132 | struct blk_plug; |
c4ad8f98 | 133 | struct filename; |
1da177e4 | 134 | |
615d6e87 DB |
135 | #define VMACACHE_BITS 2 |
136 | #define VMACACHE_SIZE (1U << VMACACHE_BITS) | |
137 | #define VMACACHE_MASK (VMACACHE_SIZE - 1) | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * List of flags we want to share for kernel threads, | |
141 | * if only because they are not used by them anyway. | |
142 | */ | |
143 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
144 | ||
145 | /* | |
146 | * These are the constant used to fake the fixed-point load-average | |
147 | * counting. Some notes: | |
148 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
149 | * a load-average precision of 10 bits integer + 11 bits fractional | |
150 | * - if you want to count load-averages more often, you need more | |
151 | * precision, or rounding will get you. With 2-second counting freq, | |
152 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
153 | * 11 bit fractions. | |
154 | */ | |
155 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 156 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
157 | |
158 | #define FSHIFT 11 /* nr of bits of precision */ | |
159 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 160 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
161 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
162 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
163 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
164 | ||
165 | #define CALC_LOAD(load,exp,n) \ | |
166 | load *= exp; \ | |
167 | load += n*(FIXED_1-exp); \ | |
168 | load >>= FSHIFT; | |
169 | ||
170 | extern unsigned long total_forks; | |
171 | extern int nr_threads; | |
1da177e4 LT |
172 | DECLARE_PER_CPU(unsigned long, process_counts); |
173 | extern int nr_processes(void); | |
174 | extern unsigned long nr_running(void); | |
1da177e4 | 175 | extern unsigned long nr_iowait(void); |
8c215bd3 | 176 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
177 | extern unsigned long this_cpu_load(void); |
178 | ||
179 | ||
0f004f5a | 180 | extern void calc_global_load(unsigned long ticks); |
5aaa0b7a | 181 | extern void update_cpu_load_nohz(void); |
1da177e4 | 182 | |
7e49fcce SR |
183 | extern unsigned long get_parent_ip(unsigned long addr); |
184 | ||
b637a328 PM |
185 | extern void dump_cpu_task(int cpu); |
186 | ||
43ae34cb IM |
187 | struct seq_file; |
188 | struct cfs_rq; | |
4cf86d77 | 189 | struct task_group; |
43ae34cb IM |
190 | #ifdef CONFIG_SCHED_DEBUG |
191 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
192 | extern void proc_sched_set_task(struct task_struct *p); | |
193 | extern void | |
5cef9eca | 194 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb | 195 | #endif |
1da177e4 | 196 | |
4a8342d2 LT |
197 | /* |
198 | * Task state bitmask. NOTE! These bits are also | |
199 | * encoded in fs/proc/array.c: get_task_state(). | |
200 | * | |
201 | * We have two separate sets of flags: task->state | |
202 | * is about runnability, while task->exit_state are | |
203 | * about the task exiting. Confusing, but this way | |
204 | * modifying one set can't modify the other one by | |
205 | * mistake. | |
206 | */ | |
1da177e4 LT |
207 | #define TASK_RUNNING 0 |
208 | #define TASK_INTERRUPTIBLE 1 | |
209 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
210 | #define __TASK_STOPPED 4 |
211 | #define __TASK_TRACED 8 | |
4a8342d2 | 212 | /* in tsk->exit_state */ |
ad86622b ON |
213 | #define EXIT_DEAD 16 |
214 | #define EXIT_ZOMBIE 32 | |
abd50b39 | 215 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
4a8342d2 | 216 | /* in tsk->state again */ |
af927232 | 217 | #define TASK_DEAD 64 |
f021a3c2 | 218 | #define TASK_WAKEKILL 128 |
e9c84311 | 219 | #define TASK_WAKING 256 |
f2530dc7 TG |
220 | #define TASK_PARKED 512 |
221 | #define TASK_STATE_MAX 1024 | |
f021a3c2 | 222 | |
ad0f614e | 223 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP" |
73342151 | 224 | |
e1781538 PZ |
225 | extern char ___assert_task_state[1 - 2*!!( |
226 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
227 | |
228 | /* Convenience macros for the sake of set_task_state */ | |
229 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
230 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
231 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 232 | |
92a1f4bc MW |
233 | /* Convenience macros for the sake of wake_up */ |
234 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 235 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
236 | |
237 | /* get_task_state() */ | |
238 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 239 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 240 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 241 | |
f021a3c2 MW |
242 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
243 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 244 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 245 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 246 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 247 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 248 | (task->flags & PF_FROZEN) == 0) |
1da177e4 LT |
249 | |
250 | #define __set_task_state(tsk, state_value) \ | |
251 | do { (tsk)->state = (state_value); } while (0) | |
252 | #define set_task_state(tsk, state_value) \ | |
253 | set_mb((tsk)->state, (state_value)) | |
254 | ||
498d0c57 AM |
255 | /* |
256 | * set_current_state() includes a barrier so that the write of current->state | |
257 | * is correctly serialised wrt the caller's subsequent test of whether to | |
258 | * actually sleep: | |
259 | * | |
260 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
261 | * if (do_i_need_to_sleep()) | |
262 | * schedule(); | |
263 | * | |
264 | * If the caller does not need such serialisation then use __set_current_state() | |
265 | */ | |
1da177e4 LT |
266 | #define __set_current_state(state_value) \ |
267 | do { current->state = (state_value); } while (0) | |
268 | #define set_current_state(state_value) \ | |
269 | set_mb(current->state, (state_value)) | |
270 | ||
271 | /* Task command name length */ | |
272 | #define TASK_COMM_LEN 16 | |
273 | ||
1da177e4 LT |
274 | #include <linux/spinlock.h> |
275 | ||
276 | /* | |
277 | * This serializes "schedule()" and also protects | |
278 | * the run-queue from deletions/modifications (but | |
279 | * _adding_ to the beginning of the run-queue has | |
280 | * a separate lock). | |
281 | */ | |
282 | extern rwlock_t tasklist_lock; | |
283 | extern spinlock_t mmlist_lock; | |
284 | ||
36c8b586 | 285 | struct task_struct; |
1da177e4 | 286 | |
db1466b3 PM |
287 | #ifdef CONFIG_PROVE_RCU |
288 | extern int lockdep_tasklist_lock_is_held(void); | |
289 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
290 | ||
1da177e4 LT |
291 | extern void sched_init(void); |
292 | extern void sched_init_smp(void); | |
2d07b255 | 293 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 294 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 295 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 296 | |
89f19f04 | 297 | extern int runqueue_is_locked(int cpu); |
017730c1 | 298 | |
3451d024 | 299 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 300 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 301 | extern void set_cpu_sd_state_idle(void); |
6201b4d6 | 302 | extern int get_nohz_timer_target(int pinned); |
46cb4b7c | 303 | #else |
c1cc017c | 304 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 305 | static inline void set_cpu_sd_state_idle(void) { } |
6201b4d6 VK |
306 | static inline int get_nohz_timer_target(int pinned) |
307 | { | |
308 | return smp_processor_id(); | |
309 | } | |
46cb4b7c | 310 | #endif |
1da177e4 | 311 | |
e59e2ae2 | 312 | /* |
39bc89fd | 313 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
314 | */ |
315 | extern void show_state_filter(unsigned long state_filter); | |
316 | ||
317 | static inline void show_state(void) | |
318 | { | |
39bc89fd | 319 | show_state_filter(0); |
e59e2ae2 IM |
320 | } |
321 | ||
1da177e4 LT |
322 | extern void show_regs(struct pt_regs *); |
323 | ||
324 | /* | |
325 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
326 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
327 | * trace (or NULL if the entire call-chain of the task should be shown). | |
328 | */ | |
329 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
330 | ||
331 | void io_schedule(void); | |
332 | long io_schedule_timeout(long timeout); | |
333 | ||
334 | extern void cpu_init (void); | |
335 | extern void trap_init(void); | |
336 | extern void update_process_times(int user); | |
337 | extern void scheduler_tick(void); | |
338 | ||
82a1fcb9 IM |
339 | extern void sched_show_task(struct task_struct *p); |
340 | ||
19cc36c0 | 341 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 342 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 343 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 344 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
345 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
346 | void __user *buffer, | |
347 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 348 | extern unsigned int softlockup_panic; |
004417a6 | 349 | void lockup_detector_init(void); |
8446f1d3 | 350 | #else |
8446f1d3 IM |
351 | static inline void touch_softlockup_watchdog(void) |
352 | { | |
353 | } | |
d6ad3e28 JW |
354 | static inline void touch_softlockup_watchdog_sync(void) |
355 | { | |
356 | } | |
04c9167f JF |
357 | static inline void touch_all_softlockup_watchdogs(void) |
358 | { | |
359 | } | |
004417a6 PZ |
360 | static inline void lockup_detector_init(void) |
361 | { | |
362 | } | |
8446f1d3 IM |
363 | #endif |
364 | ||
8b414521 MT |
365 | #ifdef CONFIG_DETECT_HUNG_TASK |
366 | void reset_hung_task_detector(void); | |
367 | #else | |
368 | static inline void reset_hung_task_detector(void) | |
369 | { | |
370 | } | |
371 | #endif | |
372 | ||
1da177e4 LT |
373 | /* Attach to any functions which should be ignored in wchan output. */ |
374 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
375 | |
376 | /* Linker adds these: start and end of __sched functions */ | |
377 | extern char __sched_text_start[], __sched_text_end[]; | |
378 | ||
1da177e4 LT |
379 | /* Is this address in the __sched functions? */ |
380 | extern int in_sched_functions(unsigned long addr); | |
381 | ||
382 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 383 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 384 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 385 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 386 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 387 | asmlinkage void schedule(void); |
c5491ea7 | 388 | extern void schedule_preempt_disabled(void); |
1da177e4 | 389 | |
ab516013 | 390 | struct nsproxy; |
acce292c | 391 | struct user_namespace; |
1da177e4 | 392 | |
efc1a3b1 DH |
393 | #ifdef CONFIG_MMU |
394 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
395 | extern unsigned long |
396 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
397 | unsigned long, unsigned long); | |
398 | extern unsigned long | |
399 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
400 | unsigned long len, unsigned long pgoff, | |
401 | unsigned long flags); | |
efc1a3b1 DH |
402 | #else |
403 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
404 | #endif | |
1da177e4 | 405 | |
d049f74f KC |
406 | #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ |
407 | #define SUID_DUMP_USER 1 /* Dump as user of process */ | |
408 | #define SUID_DUMP_ROOT 2 /* Dump as root */ | |
409 | ||
6c5d5238 | 410 | /* mm flags */ |
f8af4da3 | 411 | |
7288e118 | 412 | /* for SUID_DUMP_* above */ |
3cb4a0bb | 413 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 414 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb | 415 | |
942be387 ON |
416 | extern void set_dumpable(struct mm_struct *mm, int value); |
417 | /* | |
418 | * This returns the actual value of the suid_dumpable flag. For things | |
419 | * that are using this for checking for privilege transitions, it must | |
420 | * test against SUID_DUMP_USER rather than treating it as a boolean | |
421 | * value. | |
422 | */ | |
423 | static inline int __get_dumpable(unsigned long mm_flags) | |
424 | { | |
425 | return mm_flags & MMF_DUMPABLE_MASK; | |
426 | } | |
427 | ||
428 | static inline int get_dumpable(struct mm_struct *mm) | |
429 | { | |
430 | return __get_dumpable(mm->flags); | |
431 | } | |
432 | ||
3cb4a0bb KH |
433 | /* coredump filter bits */ |
434 | #define MMF_DUMP_ANON_PRIVATE 2 | |
435 | #define MMF_DUMP_ANON_SHARED 3 | |
436 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
437 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 438 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
439 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
440 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 441 | |
3cb4a0bb | 442 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 443 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
444 | #define MMF_DUMP_FILTER_MASK \ |
445 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
446 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 447 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
448 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
449 | ||
450 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
451 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
452 | #else | |
453 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
454 | #endif | |
f8af4da3 HD |
455 | /* leave room for more dump flags */ |
456 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 457 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 458 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 459 | |
9f68f672 ON |
460 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
461 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 462 | |
f8af4da3 | 463 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 464 | |
1da177e4 LT |
465 | struct sighand_struct { |
466 | atomic_t count; | |
467 | struct k_sigaction action[_NSIG]; | |
468 | spinlock_t siglock; | |
b8fceee1 | 469 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
470 | }; |
471 | ||
0e464814 | 472 | struct pacct_struct { |
f6ec29a4 KK |
473 | int ac_flag; |
474 | long ac_exitcode; | |
0e464814 | 475 | unsigned long ac_mem; |
77787bfb KK |
476 | cputime_t ac_utime, ac_stime; |
477 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
478 | }; |
479 | ||
42c4ab41 SG |
480 | struct cpu_itimer { |
481 | cputime_t expires; | |
482 | cputime_t incr; | |
8356b5f9 SG |
483 | u32 error; |
484 | u32 incr_error; | |
42c4ab41 SG |
485 | }; |
486 | ||
d37f761d FW |
487 | /** |
488 | * struct cputime - snaphsot of system and user cputime | |
489 | * @utime: time spent in user mode | |
490 | * @stime: time spent in system mode | |
491 | * | |
492 | * Gathers a generic snapshot of user and system time. | |
493 | */ | |
494 | struct cputime { | |
495 | cputime_t utime; | |
496 | cputime_t stime; | |
497 | }; | |
498 | ||
f06febc9 FM |
499 | /** |
500 | * struct task_cputime - collected CPU time counts | |
501 | * @utime: time spent in user mode, in &cputime_t units | |
502 | * @stime: time spent in kernel mode, in &cputime_t units | |
503 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 504 | * |
d37f761d FW |
505 | * This is an extension of struct cputime that includes the total runtime |
506 | * spent by the task from the scheduler point of view. | |
507 | * | |
508 | * As a result, this structure groups together three kinds of CPU time | |
509 | * that are tracked for threads and thread groups. Most things considering | |
f06febc9 FM |
510 | * CPU time want to group these counts together and treat all three |
511 | * of them in parallel. | |
512 | */ | |
513 | struct task_cputime { | |
514 | cputime_t utime; | |
515 | cputime_t stime; | |
516 | unsigned long long sum_exec_runtime; | |
517 | }; | |
518 | /* Alternate field names when used to cache expirations. */ | |
519 | #define prof_exp stime | |
520 | #define virt_exp utime | |
521 | #define sched_exp sum_exec_runtime | |
522 | ||
4cd4c1b4 PZ |
523 | #define INIT_CPUTIME \ |
524 | (struct task_cputime) { \ | |
64861634 MS |
525 | .utime = 0, \ |
526 | .stime = 0, \ | |
4cd4c1b4 PZ |
527 | .sum_exec_runtime = 0, \ |
528 | } | |
529 | ||
a233f112 PZ |
530 | #ifdef CONFIG_PREEMPT_COUNT |
531 | #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED) | |
532 | #else | |
533 | #define PREEMPT_DISABLED PREEMPT_ENABLED | |
534 | #endif | |
535 | ||
c99e6efe PZ |
536 | /* |
537 | * Disable preemption until the scheduler is running. | |
538 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
539 | * |
540 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
541 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 542 | */ |
a233f112 | 543 | #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE) |
c99e6efe | 544 | |
f06febc9 | 545 | /** |
4cd4c1b4 PZ |
546 | * struct thread_group_cputimer - thread group interval timer counts |
547 | * @cputime: thread group interval timers. | |
548 | * @running: non-zero when there are timers running and | |
549 | * @cputime receives updates. | |
550 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
551 | * |
552 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 553 | * used for thread group CPU timer calculations. |
f06febc9 | 554 | */ |
4cd4c1b4 PZ |
555 | struct thread_group_cputimer { |
556 | struct task_cputime cputime; | |
557 | int running; | |
ee30a7b2 | 558 | raw_spinlock_t lock; |
f06febc9 | 559 | }; |
f06febc9 | 560 | |
4714d1d3 | 561 | #include <linux/rwsem.h> |
5091faa4 MG |
562 | struct autogroup; |
563 | ||
1da177e4 | 564 | /* |
e815f0a8 | 565 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
566 | * locking, because a shared signal_struct always |
567 | * implies a shared sighand_struct, so locking | |
568 | * sighand_struct is always a proper superset of | |
569 | * the locking of signal_struct. | |
570 | */ | |
571 | struct signal_struct { | |
ea6d290c | 572 | atomic_t sigcnt; |
1da177e4 | 573 | atomic_t live; |
b3ac022c | 574 | int nr_threads; |
0c740d0a | 575 | struct list_head thread_head; |
1da177e4 LT |
576 | |
577 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
578 | ||
579 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 580 | struct task_struct *curr_target; |
1da177e4 LT |
581 | |
582 | /* shared signal handling: */ | |
583 | struct sigpending shared_pending; | |
584 | ||
585 | /* thread group exit support */ | |
586 | int group_exit_code; | |
587 | /* overloaded: | |
588 | * - notify group_exit_task when ->count is equal to notify_count | |
589 | * - everyone except group_exit_task is stopped during signal delivery | |
590 | * of fatal signals, group_exit_task processes the signal. | |
591 | */ | |
1da177e4 | 592 | int notify_count; |
07dd20e0 | 593 | struct task_struct *group_exit_task; |
1da177e4 LT |
594 | |
595 | /* thread group stop support, overloads group_exit_code too */ | |
596 | int group_stop_count; | |
597 | unsigned int flags; /* see SIGNAL_* flags below */ | |
598 | ||
ebec18a6 LP |
599 | /* |
600 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
601 | * manager, to re-parent orphan (double-forking) child processes | |
602 | * to this process instead of 'init'. The service manager is | |
603 | * able to receive SIGCHLD signals and is able to investigate | |
604 | * the process until it calls wait(). All children of this | |
605 | * process will inherit a flag if they should look for a | |
606 | * child_subreaper process at exit. | |
607 | */ | |
608 | unsigned int is_child_subreaper:1; | |
609 | unsigned int has_child_subreaper:1; | |
610 | ||
1da177e4 | 611 | /* POSIX.1b Interval Timers */ |
5ed67f05 PE |
612 | int posix_timer_id; |
613 | struct list_head posix_timers; | |
1da177e4 LT |
614 | |
615 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 616 | struct hrtimer real_timer; |
fea9d175 | 617 | struct pid *leader_pid; |
2ff678b8 | 618 | ktime_t it_real_incr; |
1da177e4 | 619 | |
42c4ab41 SG |
620 | /* |
621 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
622 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
623 | * values are defined to 0 and 1 respectively | |
624 | */ | |
625 | struct cpu_itimer it[2]; | |
1da177e4 | 626 | |
f06febc9 | 627 | /* |
4cd4c1b4 PZ |
628 | * Thread group totals for process CPU timers. |
629 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 630 | */ |
4cd4c1b4 | 631 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
632 | |
633 | /* Earliest-expiration cache. */ | |
634 | struct task_cputime cputime_expires; | |
635 | ||
636 | struct list_head cpu_timers[3]; | |
637 | ||
ab521dc0 | 638 | struct pid *tty_old_pgrp; |
1ec320af | 639 | |
1da177e4 LT |
640 | /* boolean value for session group leader */ |
641 | int leader; | |
642 | ||
643 | struct tty_struct *tty; /* NULL if no tty */ | |
644 | ||
5091faa4 MG |
645 | #ifdef CONFIG_SCHED_AUTOGROUP |
646 | struct autogroup *autogroup; | |
647 | #endif | |
1da177e4 LT |
648 | /* |
649 | * Cumulative resource counters for dead threads in the group, | |
650 | * and for reaped dead child processes forked by this group. | |
651 | * Live threads maintain their own counters and add to these | |
652 | * in __exit_signal, except for the group leader. | |
653 | */ | |
32bd671d | 654 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
655 | cputime_t gtime; |
656 | cputime_t cgtime; | |
9fbc42ea | 657 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 658 | struct cputime prev_cputime; |
0cf55e1e | 659 | #endif |
1da177e4 LT |
660 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
661 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 662 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 663 | unsigned long maxrss, cmaxrss; |
940389b8 | 664 | struct task_io_accounting ioac; |
1da177e4 | 665 | |
32bd671d PZ |
666 | /* |
667 | * Cumulative ns of schedule CPU time fo dead threads in the | |
668 | * group, not including a zombie group leader, (This only differs | |
669 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
670 | * other than jiffies.) | |
671 | */ | |
672 | unsigned long long sum_sched_runtime; | |
673 | ||
1da177e4 LT |
674 | /* |
675 | * We don't bother to synchronize most readers of this at all, | |
676 | * because there is no reader checking a limit that actually needs | |
677 | * to get both rlim_cur and rlim_max atomically, and either one | |
678 | * alone is a single word that can safely be read normally. | |
679 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
680 | * protect this instead of the siglock, because they really | |
681 | * have no need to disable irqs. | |
682 | */ | |
683 | struct rlimit rlim[RLIM_NLIMITS]; | |
684 | ||
0e464814 KK |
685 | #ifdef CONFIG_BSD_PROCESS_ACCT |
686 | struct pacct_struct pacct; /* per-process accounting information */ | |
687 | #endif | |
ad4ecbcb | 688 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
689 | struct taskstats *stats; |
690 | #endif | |
522ed776 MT |
691 | #ifdef CONFIG_AUDIT |
692 | unsigned audit_tty; | |
46e959ea | 693 | unsigned audit_tty_log_passwd; |
522ed776 MT |
694 | struct tty_audit_buf *tty_audit_buf; |
695 | #endif | |
4714d1d3 BB |
696 | #ifdef CONFIG_CGROUPS |
697 | /* | |
77e4ef99 TH |
698 | * group_rwsem prevents new tasks from entering the threadgroup and |
699 | * member tasks from exiting,a more specifically, setting of | |
700 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
701 | * using threadgroup_change_begin/end(). Users which require | |
702 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
703 | * which also takes care of exec path. Currently, cgroup is the | |
704 | * only user. | |
4714d1d3 | 705 | */ |
257058ae | 706 | struct rw_semaphore group_rwsem; |
4714d1d3 | 707 | #endif |
28b83c51 | 708 | |
e1e12d2f | 709 | oom_flags_t oom_flags; |
a9c58b90 DR |
710 | short oom_score_adj; /* OOM kill score adjustment */ |
711 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
712 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
713 | |
714 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
715 | * credential calculations | |
716 | * (notably. ptrace) */ | |
1da177e4 LT |
717 | }; |
718 | ||
719 | /* | |
720 | * Bits in flags field of signal_struct. | |
721 | */ | |
722 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
723 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
724 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
403bad72 | 725 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ |
e4420551 ON |
726 | /* |
727 | * Pending notifications to parent. | |
728 | */ | |
729 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
730 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
731 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 732 | |
fae5fa44 ON |
733 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
734 | ||
ed5d2cac ON |
735 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
736 | static inline int signal_group_exit(const struct signal_struct *sig) | |
737 | { | |
738 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
739 | (sig->group_exit_task != NULL); | |
740 | } | |
741 | ||
1da177e4 LT |
742 | /* |
743 | * Some day this will be a full-fledged user tracking system.. | |
744 | */ | |
745 | struct user_struct { | |
746 | atomic_t __count; /* reference count */ | |
747 | atomic_t processes; /* How many processes does this user have? */ | |
748 | atomic_t files; /* How many open files does this user have? */ | |
749 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 750 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
751 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
752 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
753 | #endif | |
4afeff85 EP |
754 | #ifdef CONFIG_FANOTIFY |
755 | atomic_t fanotify_listeners; | |
756 | #endif | |
7ef9964e | 757 | #ifdef CONFIG_EPOLL |
52bd19f7 | 758 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 759 | #endif |
970a8645 | 760 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
761 | /* protected by mq_lock */ |
762 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 763 | #endif |
1da177e4 LT |
764 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
765 | ||
766 | #ifdef CONFIG_KEYS | |
767 | struct key *uid_keyring; /* UID specific keyring */ | |
768 | struct key *session_keyring; /* UID's default session keyring */ | |
769 | #endif | |
770 | ||
771 | /* Hash table maintenance information */ | |
735de223 | 772 | struct hlist_node uidhash_node; |
7b44ab97 | 773 | kuid_t uid; |
24e377a8 | 774 | |
cdd6c482 | 775 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
776 | atomic_long_t locked_vm; |
777 | #endif | |
1da177e4 LT |
778 | }; |
779 | ||
eb41d946 | 780 | extern int uids_sysfs_init(void); |
5cb350ba | 781 | |
7b44ab97 | 782 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
783 | |
784 | extern struct user_struct root_user; | |
785 | #define INIT_USER (&root_user) | |
786 | ||
b6dff3ec | 787 | |
1da177e4 LT |
788 | struct backing_dev_info; |
789 | struct reclaim_state; | |
790 | ||
52f17b6c | 791 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
792 | struct sched_info { |
793 | /* cumulative counters */ | |
2d72376b | 794 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 795 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
796 | |
797 | /* timestamps */ | |
172ba844 BS |
798 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
799 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 800 | }; |
52f17b6c | 801 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 802 | |
ca74e92b SN |
803 | #ifdef CONFIG_TASK_DELAY_ACCT |
804 | struct task_delay_info { | |
805 | spinlock_t lock; | |
806 | unsigned int flags; /* Private per-task flags */ | |
807 | ||
808 | /* For each stat XXX, add following, aligned appropriately | |
809 | * | |
810 | * struct timespec XXX_start, XXX_end; | |
811 | * u64 XXX_delay; | |
812 | * u32 XXX_count; | |
813 | * | |
814 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
815 | * single lock above (split into XXX_lock if contention is an issue). | |
816 | */ | |
0ff92245 SN |
817 | |
818 | /* | |
819 | * XXX_count is incremented on every XXX operation, the delay | |
820 | * associated with the operation is added to XXX_delay. | |
821 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
822 | */ | |
823 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
824 | u64 blkio_delay; /* wait for sync block io completion */ | |
825 | u64 swapin_delay; /* wait for swapin block io completion */ | |
826 | u32 blkio_count; /* total count of the number of sync block */ | |
827 | /* io operations performed */ | |
828 | u32 swapin_count; /* total count of the number of swapin block */ | |
829 | /* io operations performed */ | |
873b4771 KK |
830 | |
831 | struct timespec freepages_start, freepages_end; | |
832 | u64 freepages_delay; /* wait for memory reclaim */ | |
833 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 834 | }; |
52f17b6c CS |
835 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
836 | ||
837 | static inline int sched_info_on(void) | |
838 | { | |
839 | #ifdef CONFIG_SCHEDSTATS | |
840 | return 1; | |
841 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
842 | extern int delayacct_on; | |
843 | return delayacct_on; | |
844 | #else | |
845 | return 0; | |
ca74e92b | 846 | #endif |
52f17b6c | 847 | } |
ca74e92b | 848 | |
d15bcfdb IM |
849 | enum cpu_idle_type { |
850 | CPU_IDLE, | |
851 | CPU_NOT_IDLE, | |
852 | CPU_NEWLY_IDLE, | |
853 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
854 | }; |
855 | ||
1399fa78 NR |
856 | /* |
857 | * Increase resolution of cpu_power calculations | |
858 | */ | |
859 | #define SCHED_POWER_SHIFT 10 | |
860 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) | |
1da177e4 | 861 | |
1399fa78 NR |
862 | /* |
863 | * sched-domains (multiprocessor balancing) declarations: | |
864 | */ | |
2dd73a4f | 865 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
866 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
867 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
868 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
869 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 870 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 871 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
b5d978e0 | 872 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
d77b3ed5 | 873 | #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ |
b5d978e0 PZ |
874 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
875 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 876 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 877 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 878 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
3a7053b3 | 879 | #define SD_NUMA 0x4000 /* cross-node balancing */ |
5c45bf27 | 880 | |
143e1e28 VG |
881 | #ifdef CONFIG_SCHED_SMT |
882 | static inline const int cpu_smt_flags(void) | |
883 | { | |
884 | return SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES; | |
885 | } | |
886 | #endif | |
887 | ||
888 | #ifdef CONFIG_SCHED_MC | |
889 | static inline const int cpu_core_flags(void) | |
890 | { | |
891 | return SD_SHARE_PKG_RESOURCES; | |
892 | } | |
893 | #endif | |
894 | ||
895 | #ifdef CONFIG_NUMA | |
896 | static inline const int cpu_numa_flags(void) | |
897 | { | |
898 | return SD_NUMA; | |
899 | } | |
900 | #endif | |
532cb4c4 | 901 | |
1d3504fc HS |
902 | struct sched_domain_attr { |
903 | int relax_domain_level; | |
904 | }; | |
905 | ||
906 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
907 | .relax_domain_level = -1, \ | |
908 | } | |
909 | ||
60495e77 PZ |
910 | extern int sched_domain_level_max; |
911 | ||
5e6521ea LZ |
912 | struct sched_group; |
913 | ||
1da177e4 LT |
914 | struct sched_domain { |
915 | /* These fields must be setup */ | |
916 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 917 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 918 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
919 | unsigned long min_interval; /* Minimum balance interval ms */ |
920 | unsigned long max_interval; /* Maximum balance interval ms */ | |
921 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
922 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 923 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
924 | unsigned int busy_idx; |
925 | unsigned int idle_idx; | |
926 | unsigned int newidle_idx; | |
927 | unsigned int wake_idx; | |
147cbb4b | 928 | unsigned int forkexec_idx; |
a52bfd73 | 929 | unsigned int smt_gain; |
25f55d9d VG |
930 | |
931 | int nohz_idle; /* NOHZ IDLE status */ | |
1da177e4 | 932 | int flags; /* See SD_* */ |
60495e77 | 933 | int level; |
1da177e4 LT |
934 | |
935 | /* Runtime fields. */ | |
936 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
937 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
938 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
939 | ||
f48627e6 | 940 | /* idle_balance() stats */ |
9bd721c5 | 941 | u64 max_newidle_lb_cost; |
f48627e6 | 942 | unsigned long next_decay_max_lb_cost; |
2398f2c6 | 943 | |
1da177e4 LT |
944 | #ifdef CONFIG_SCHEDSTATS |
945 | /* load_balance() stats */ | |
480b9434 KC |
946 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
947 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
948 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
949 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
950 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
951 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
952 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
953 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
954 | |
955 | /* Active load balancing */ | |
480b9434 KC |
956 | unsigned int alb_count; |
957 | unsigned int alb_failed; | |
958 | unsigned int alb_pushed; | |
1da177e4 | 959 | |
68767a0a | 960 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
961 | unsigned int sbe_count; |
962 | unsigned int sbe_balanced; | |
963 | unsigned int sbe_pushed; | |
1da177e4 | 964 | |
68767a0a | 965 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
966 | unsigned int sbf_count; |
967 | unsigned int sbf_balanced; | |
968 | unsigned int sbf_pushed; | |
68767a0a | 969 | |
1da177e4 | 970 | /* try_to_wake_up() stats */ |
480b9434 KC |
971 | unsigned int ttwu_wake_remote; |
972 | unsigned int ttwu_move_affine; | |
973 | unsigned int ttwu_move_balance; | |
1da177e4 | 974 | #endif |
a5d8c348 IM |
975 | #ifdef CONFIG_SCHED_DEBUG |
976 | char *name; | |
977 | #endif | |
dce840a0 PZ |
978 | union { |
979 | void *private; /* used during construction */ | |
980 | struct rcu_head rcu; /* used during destruction */ | |
981 | }; | |
6c99e9ad | 982 | |
669c55e9 | 983 | unsigned int span_weight; |
4200efd9 IM |
984 | /* |
985 | * Span of all CPUs in this domain. | |
986 | * | |
987 | * NOTE: this field is variable length. (Allocated dynamically | |
988 | * by attaching extra space to the end of the structure, | |
989 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
990 | */ |
991 | unsigned long span[0]; | |
1da177e4 LT |
992 | }; |
993 | ||
758b2cdc RR |
994 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
995 | { | |
6c99e9ad | 996 | return to_cpumask(sd->span); |
758b2cdc RR |
997 | } |
998 | ||
acc3f5d7 | 999 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 1000 | struct sched_domain_attr *dattr_new); |
029190c5 | 1001 | |
acc3f5d7 RR |
1002 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
1003 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1004 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1005 | ||
39be3501 PZ |
1006 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1007 | ||
143e1e28 VG |
1008 | typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); |
1009 | typedef const int (*sched_domain_flags_f)(void); | |
1010 | ||
1011 | #define SDTL_OVERLAP 0x01 | |
1012 | ||
1013 | struct sd_data { | |
1014 | struct sched_domain **__percpu sd; | |
1015 | struct sched_group **__percpu sg; | |
1016 | struct sched_group_power **__percpu sgp; | |
1017 | }; | |
1018 | ||
1019 | struct sched_domain_topology_level { | |
1020 | sched_domain_mask_f mask; | |
1021 | sched_domain_flags_f sd_flags; | |
1022 | int flags; | |
1023 | int numa_level; | |
1024 | struct sd_data data; | |
1025 | #ifdef CONFIG_SCHED_DEBUG | |
1026 | char *name; | |
1027 | #endif | |
1028 | }; | |
1029 | ||
1030 | extern struct sched_domain_topology_level *sched_domain_topology; | |
1031 | ||
1032 | extern void set_sched_topology(struct sched_domain_topology_level *tl); | |
1033 | ||
1034 | #ifdef CONFIG_SCHED_DEBUG | |
1035 | # define SD_INIT_NAME(type) .name = #type | |
1036 | #else | |
1037 | # define SD_INIT_NAME(type) | |
1038 | #endif | |
1039 | ||
1b427c15 | 1040 | #else /* CONFIG_SMP */ |
1da177e4 | 1041 | |
1b427c15 | 1042 | struct sched_domain_attr; |
d02c7a8c | 1043 | |
1b427c15 | 1044 | static inline void |
acc3f5d7 | 1045 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1046 | struct sched_domain_attr *dattr_new) |
1047 | { | |
d02c7a8c | 1048 | } |
39be3501 PZ |
1049 | |
1050 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1051 | { | |
1052 | return true; | |
1053 | } | |
1054 | ||
1b427c15 | 1055 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1056 | |
47fe38fc | 1057 | |
1da177e4 | 1058 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1059 | |
1da177e4 | 1060 | |
383f2835 | 1061 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1062 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
1063 | #else |
1064 | static inline void prefetch_stack(struct task_struct *t) { } | |
1065 | #endif | |
1da177e4 LT |
1066 | |
1067 | struct audit_context; /* See audit.c */ | |
1068 | struct mempolicy; | |
b92ce558 | 1069 | struct pipe_inode_info; |
4865ecf1 | 1070 | struct uts_namespace; |
1da177e4 | 1071 | |
20b8a59f | 1072 | struct load_weight { |
9dbdb155 PZ |
1073 | unsigned long weight; |
1074 | u32 inv_weight; | |
20b8a59f IM |
1075 | }; |
1076 | ||
9d85f21c PT |
1077 | struct sched_avg { |
1078 | /* | |
1079 | * These sums represent an infinite geometric series and so are bound | |
239003ea | 1080 | * above by 1024/(1-y). Thus we only need a u32 to store them for all |
9d85f21c PT |
1081 | * choices of y < 1-2^(-32)*1024. |
1082 | */ | |
1083 | u32 runnable_avg_sum, runnable_avg_period; | |
1084 | u64 last_runnable_update; | |
9ee474f5 | 1085 | s64 decay_count; |
2dac754e | 1086 | unsigned long load_avg_contrib; |
9d85f21c PT |
1087 | }; |
1088 | ||
94c18227 | 1089 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1090 | struct sched_statistics { |
20b8a59f | 1091 | u64 wait_start; |
94c18227 | 1092 | u64 wait_max; |
6d082592 AV |
1093 | u64 wait_count; |
1094 | u64 wait_sum; | |
8f0dfc34 AV |
1095 | u64 iowait_count; |
1096 | u64 iowait_sum; | |
94c18227 | 1097 | |
20b8a59f | 1098 | u64 sleep_start; |
20b8a59f | 1099 | u64 sleep_max; |
94c18227 IM |
1100 | s64 sum_sleep_runtime; |
1101 | ||
1102 | u64 block_start; | |
20b8a59f IM |
1103 | u64 block_max; |
1104 | u64 exec_max; | |
eba1ed4b | 1105 | u64 slice_max; |
cc367732 | 1106 | |
cc367732 IM |
1107 | u64 nr_migrations_cold; |
1108 | u64 nr_failed_migrations_affine; | |
1109 | u64 nr_failed_migrations_running; | |
1110 | u64 nr_failed_migrations_hot; | |
1111 | u64 nr_forced_migrations; | |
cc367732 IM |
1112 | |
1113 | u64 nr_wakeups; | |
1114 | u64 nr_wakeups_sync; | |
1115 | u64 nr_wakeups_migrate; | |
1116 | u64 nr_wakeups_local; | |
1117 | u64 nr_wakeups_remote; | |
1118 | u64 nr_wakeups_affine; | |
1119 | u64 nr_wakeups_affine_attempts; | |
1120 | u64 nr_wakeups_passive; | |
1121 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1122 | }; |
1123 | #endif | |
1124 | ||
1125 | struct sched_entity { | |
1126 | struct load_weight load; /* for load-balancing */ | |
1127 | struct rb_node run_node; | |
1128 | struct list_head group_node; | |
1129 | unsigned int on_rq; | |
1130 | ||
1131 | u64 exec_start; | |
1132 | u64 sum_exec_runtime; | |
1133 | u64 vruntime; | |
1134 | u64 prev_sum_exec_runtime; | |
1135 | ||
41acab88 LDM |
1136 | u64 nr_migrations; |
1137 | ||
41acab88 LDM |
1138 | #ifdef CONFIG_SCHEDSTATS |
1139 | struct sched_statistics statistics; | |
94c18227 IM |
1140 | #endif |
1141 | ||
20b8a59f | 1142 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 1143 | int depth; |
20b8a59f IM |
1144 | struct sched_entity *parent; |
1145 | /* rq on which this entity is (to be) queued: */ | |
1146 | struct cfs_rq *cfs_rq; | |
1147 | /* rq "owned" by this entity/group: */ | |
1148 | struct cfs_rq *my_q; | |
1149 | #endif | |
8bd75c77 | 1150 | |
141965c7 | 1151 | #ifdef CONFIG_SMP |
f4e26b12 | 1152 | /* Per-entity load-tracking */ |
9d85f21c PT |
1153 | struct sched_avg avg; |
1154 | #endif | |
20b8a59f | 1155 | }; |
70b97a7f | 1156 | |
fa717060 PZ |
1157 | struct sched_rt_entity { |
1158 | struct list_head run_list; | |
78f2c7db | 1159 | unsigned long timeout; |
57d2aa00 | 1160 | unsigned long watchdog_stamp; |
bee367ed | 1161 | unsigned int time_slice; |
6f505b16 | 1162 | |
58d6c2d7 | 1163 | struct sched_rt_entity *back; |
052f1dc7 | 1164 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1165 | struct sched_rt_entity *parent; |
1166 | /* rq on which this entity is (to be) queued: */ | |
1167 | struct rt_rq *rt_rq; | |
1168 | /* rq "owned" by this entity/group: */ | |
1169 | struct rt_rq *my_q; | |
1170 | #endif | |
fa717060 PZ |
1171 | }; |
1172 | ||
aab03e05 DF |
1173 | struct sched_dl_entity { |
1174 | struct rb_node rb_node; | |
1175 | ||
1176 | /* | |
1177 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 1178 | * during sched_setattr(), they will remain the same until |
1179 | * the next sched_setattr(). | |
aab03e05 DF |
1180 | */ |
1181 | u64 dl_runtime; /* maximum runtime for each instance */ | |
1182 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 1183 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 1184 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
1185 | |
1186 | /* | |
1187 | * Actual scheduling parameters. Initialized with the values above, | |
1188 | * they are continously updated during task execution. Note that | |
1189 | * the remaining runtime could be < 0 in case we are in overrun. | |
1190 | */ | |
1191 | s64 runtime; /* remaining runtime for this instance */ | |
1192 | u64 deadline; /* absolute deadline for this instance */ | |
1193 | unsigned int flags; /* specifying the scheduler behaviour */ | |
1194 | ||
1195 | /* | |
1196 | * Some bool flags: | |
1197 | * | |
1198 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
1199 | * task has to wait for a replenishment to be performed at the | |
1200 | * next firing of dl_timer. | |
1201 | * | |
1202 | * @dl_new tells if a new instance arrived. If so we must | |
1203 | * start executing it with full runtime and reset its absolute | |
1204 | * deadline; | |
2d3d891d DF |
1205 | * |
1206 | * @dl_boosted tells if we are boosted due to DI. If so we are | |
1207 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
1208 | * exit the critical section); |
1209 | * | |
1210 | * @dl_yielded tells if task gave up the cpu before consuming | |
1211 | * all its available runtime during the last job. | |
aab03e05 | 1212 | */ |
5bfd126e | 1213 | int dl_throttled, dl_new, dl_boosted, dl_yielded; |
aab03e05 DF |
1214 | |
1215 | /* | |
1216 | * Bandwidth enforcement timer. Each -deadline task has its | |
1217 | * own bandwidth to be enforced, thus we need one timer per task. | |
1218 | */ | |
1219 | struct hrtimer dl_timer; | |
1220 | }; | |
8bd75c77 | 1221 | |
86848966 PM |
1222 | struct rcu_node; |
1223 | ||
8dc85d54 PZ |
1224 | enum perf_event_task_context { |
1225 | perf_invalid_context = -1, | |
1226 | perf_hw_context = 0, | |
89a1e187 | 1227 | perf_sw_context, |
8dc85d54 PZ |
1228 | perf_nr_task_contexts, |
1229 | }; | |
1230 | ||
1da177e4 LT |
1231 | struct task_struct { |
1232 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1233 | void *stack; |
1da177e4 | 1234 | atomic_t usage; |
97dc32cd WC |
1235 | unsigned int flags; /* per process flags, defined below */ |
1236 | unsigned int ptrace; | |
1da177e4 | 1237 | |
2dd73a4f | 1238 | #ifdef CONFIG_SMP |
fa14ff4a | 1239 | struct llist_node wake_entry; |
3ca7a440 | 1240 | int on_cpu; |
62470419 MW |
1241 | struct task_struct *last_wakee; |
1242 | unsigned long wakee_flips; | |
1243 | unsigned long wakee_flip_decay_ts; | |
ac66f547 PZ |
1244 | |
1245 | int wake_cpu; | |
2dd73a4f | 1246 | #endif |
fd2f4419 | 1247 | int on_rq; |
50e645a8 | 1248 | |
b29739f9 | 1249 | int prio, static_prio, normal_prio; |
c7aceaba | 1250 | unsigned int rt_priority; |
5522d5d5 | 1251 | const struct sched_class *sched_class; |
20b8a59f | 1252 | struct sched_entity se; |
fa717060 | 1253 | struct sched_rt_entity rt; |
8323f26c PZ |
1254 | #ifdef CONFIG_CGROUP_SCHED |
1255 | struct task_group *sched_task_group; | |
1256 | #endif | |
aab03e05 | 1257 | struct sched_dl_entity dl; |
1da177e4 | 1258 | |
e107be36 AK |
1259 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1260 | /* list of struct preempt_notifier: */ | |
1261 | struct hlist_head preempt_notifiers; | |
1262 | #endif | |
1263 | ||
6c5c9341 | 1264 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1265 | unsigned int btrace_seq; |
6c5c9341 | 1266 | #endif |
1da177e4 | 1267 | |
97dc32cd | 1268 | unsigned int policy; |
29baa747 | 1269 | int nr_cpus_allowed; |
1da177e4 | 1270 | cpumask_t cpus_allowed; |
1da177e4 | 1271 | |
a57eb940 | 1272 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1273 | int rcu_read_lock_nesting; |
f41d911f | 1274 | char rcu_read_unlock_special; |
f41d911f | 1275 | struct list_head rcu_node_entry; |
a57eb940 PM |
1276 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1277 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1278 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1279 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1280 | #ifdef CONFIG_RCU_BOOST |
1281 | struct rt_mutex *rcu_boost_mutex; | |
1282 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1283 | |
52f17b6c | 1284 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1285 | struct sched_info sched_info; |
1286 | #endif | |
1287 | ||
1288 | struct list_head tasks; | |
806c09a7 | 1289 | #ifdef CONFIG_SMP |
917b627d | 1290 | struct plist_node pushable_tasks; |
1baca4ce | 1291 | struct rb_node pushable_dl_tasks; |
806c09a7 | 1292 | #endif |
1da177e4 LT |
1293 | |
1294 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1295 | #ifdef CONFIG_COMPAT_BRK |
1296 | unsigned brk_randomized:1; | |
1297 | #endif | |
615d6e87 DB |
1298 | /* per-thread vma caching */ |
1299 | u32 vmacache_seqnum; | |
1300 | struct vm_area_struct *vmacache[VMACACHE_SIZE]; | |
34e55232 KH |
1301 | #if defined(SPLIT_RSS_COUNTING) |
1302 | struct task_rss_stat rss_stat; | |
1303 | #endif | |
1da177e4 | 1304 | /* task state */ |
97dc32cd | 1305 | int exit_state; |
1da177e4 LT |
1306 | int exit_code, exit_signal; |
1307 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1308 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
1309 | |
1310 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 1311 | unsigned int personality; |
9b89f6ba | 1312 | |
f9ce1f1c KT |
1313 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1314 | * execve */ | |
8f0dfc34 AV |
1315 | unsigned in_iowait:1; |
1316 | ||
259e5e6c AL |
1317 | /* task may not gain privileges */ |
1318 | unsigned no_new_privs:1; | |
ca94c442 LP |
1319 | |
1320 | /* Revert to default priority/policy when forking */ | |
1321 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1322 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1323 | |
1da177e4 LT |
1324 | pid_t pid; |
1325 | pid_t tgid; | |
0a425405 | 1326 | |
1314562a | 1327 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1328 | /* Canary value for the -fstack-protector gcc feature */ |
1329 | unsigned long stack_canary; | |
1314562a | 1330 | #endif |
4d1d61a6 | 1331 | /* |
1da177e4 | 1332 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1333 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1334 | * p->real_parent->pid) |
1da177e4 | 1335 | */ |
abd63bc3 KC |
1336 | struct task_struct __rcu *real_parent; /* real parent process */ |
1337 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1338 | /* |
f470021a | 1339 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1340 | */ |
1341 | struct list_head children; /* list of my children */ | |
1342 | struct list_head sibling; /* linkage in my parent's children list */ | |
1343 | struct task_struct *group_leader; /* threadgroup leader */ | |
1344 | ||
f470021a RM |
1345 | /* |
1346 | * ptraced is the list of tasks this task is using ptrace on. | |
1347 | * This includes both natural children and PTRACE_ATTACH targets. | |
1348 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1349 | */ | |
1350 | struct list_head ptraced; | |
1351 | struct list_head ptrace_entry; | |
1352 | ||
1da177e4 | 1353 | /* PID/PID hash table linkage. */ |
92476d7f | 1354 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1355 | struct list_head thread_group; |
0c740d0a | 1356 | struct list_head thread_node; |
1da177e4 LT |
1357 | |
1358 | struct completion *vfork_done; /* for vfork() */ | |
1359 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1360 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1361 | ||
c66f08be | 1362 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1363 | cputime_t gtime; |
9fbc42ea | 1364 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 1365 | struct cputime prev_cputime; |
6a61671b FW |
1366 | #endif |
1367 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | |
1368 | seqlock_t vtime_seqlock; | |
1369 | unsigned long long vtime_snap; | |
1370 | enum { | |
1371 | VTIME_SLEEPING = 0, | |
1372 | VTIME_USER, | |
1373 | VTIME_SYS, | |
1374 | } vtime_snap_whence; | |
d99ca3b9 | 1375 | #endif |
1da177e4 | 1376 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1377 | struct timespec start_time; /* monotonic time */ |
1378 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1379 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1380 | unsigned long min_flt, maj_flt; | |
1381 | ||
f06febc9 | 1382 | struct task_cputime cputime_expires; |
1da177e4 LT |
1383 | struct list_head cpu_timers[3]; |
1384 | ||
1385 | /* process credentials */ | |
1b0ba1c9 | 1386 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1387 | * credentials (COW) */ |
1b0ba1c9 | 1388 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1389 | * credentials (COW) */ |
36772092 PBG |
1390 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1391 | - access with [gs]et_task_comm (which lock | |
1392 | it with task_lock()) | |
221af7f8 | 1393 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1394 | /* file system info */ |
1395 | int link_count, total_link_count; | |
3d5b6fcc | 1396 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1397 | /* ipc stuff */ |
1398 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1399 | #endif |
e162b39a | 1400 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1401 | /* hung task detection */ |
82a1fcb9 IM |
1402 | unsigned long last_switch_count; |
1403 | #endif | |
1da177e4 LT |
1404 | /* CPU-specific state of this task */ |
1405 | struct thread_struct thread; | |
1406 | /* filesystem information */ | |
1407 | struct fs_struct *fs; | |
1408 | /* open file information */ | |
1409 | struct files_struct *files; | |
1651e14e | 1410 | /* namespaces */ |
ab516013 | 1411 | struct nsproxy *nsproxy; |
1da177e4 LT |
1412 | /* signal handlers */ |
1413 | struct signal_struct *signal; | |
1414 | struct sighand_struct *sighand; | |
1415 | ||
1416 | sigset_t blocked, real_blocked; | |
f3de272b | 1417 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1418 | struct sigpending pending; |
1419 | ||
1420 | unsigned long sas_ss_sp; | |
1421 | size_t sas_ss_size; | |
1422 | int (*notifier)(void *priv); | |
1423 | void *notifier_data; | |
1424 | sigset_t *notifier_mask; | |
67d12145 | 1425 | struct callback_head *task_works; |
e73f8959 | 1426 | |
1da177e4 | 1427 | struct audit_context *audit_context; |
bfef93a5 | 1428 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1429 | kuid_t loginuid; |
4746ec5b | 1430 | unsigned int sessionid; |
bfef93a5 | 1431 | #endif |
932ecebb | 1432 | struct seccomp seccomp; |
1da177e4 LT |
1433 | |
1434 | /* Thread group tracking */ | |
1435 | u32 parent_exec_id; | |
1436 | u32 self_exec_id; | |
58568d2a MX |
1437 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1438 | * mempolicy */ | |
1da177e4 | 1439 | spinlock_t alloc_lock; |
1da177e4 | 1440 | |
b29739f9 | 1441 | /* Protection of the PI data structures: */ |
1d615482 | 1442 | raw_spinlock_t pi_lock; |
b29739f9 | 1443 | |
23f78d4a IM |
1444 | #ifdef CONFIG_RT_MUTEXES |
1445 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
1446 | struct rb_root pi_waiters; |
1447 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
1448 | /* Deadlock detection and priority inheritance handling */ |
1449 | struct rt_mutex_waiter *pi_blocked_on; | |
2d3d891d DF |
1450 | /* Top pi_waiters task */ |
1451 | struct task_struct *pi_top_task; | |
23f78d4a IM |
1452 | #endif |
1453 | ||
408894ee IM |
1454 | #ifdef CONFIG_DEBUG_MUTEXES |
1455 | /* mutex deadlock detection */ | |
1456 | struct mutex_waiter *blocked_on; | |
1457 | #endif | |
de30a2b3 IM |
1458 | #ifdef CONFIG_TRACE_IRQFLAGS |
1459 | unsigned int irq_events; | |
de30a2b3 | 1460 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1461 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1462 | unsigned int hardirq_enable_event; |
de30a2b3 | 1463 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1464 | int hardirqs_enabled; |
1465 | int hardirq_context; | |
de30a2b3 | 1466 | unsigned long softirq_disable_ip; |
de30a2b3 | 1467 | unsigned long softirq_enable_ip; |
fa1452e8 | 1468 | unsigned int softirq_disable_event; |
de30a2b3 | 1469 | unsigned int softirq_enable_event; |
fa1452e8 | 1470 | int softirqs_enabled; |
de30a2b3 IM |
1471 | int softirq_context; |
1472 | #endif | |
fbb9ce95 | 1473 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1474 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1475 | u64 curr_chain_key; |
1476 | int lockdep_depth; | |
fbb9ce95 | 1477 | unsigned int lockdep_recursion; |
c7aceaba | 1478 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1479 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1480 | #endif |
408894ee | 1481 | |
1da177e4 LT |
1482 | /* journalling filesystem info */ |
1483 | void *journal_info; | |
1484 | ||
d89d8796 | 1485 | /* stacked block device info */ |
bddd87c7 | 1486 | struct bio_list *bio_list; |
d89d8796 | 1487 | |
73c10101 JA |
1488 | #ifdef CONFIG_BLOCK |
1489 | /* stack plugging */ | |
1490 | struct blk_plug *plug; | |
1491 | #endif | |
1492 | ||
1da177e4 LT |
1493 | /* VM state */ |
1494 | struct reclaim_state *reclaim_state; | |
1495 | ||
1da177e4 LT |
1496 | struct backing_dev_info *backing_dev_info; |
1497 | ||
1498 | struct io_context *io_context; | |
1499 | ||
1500 | unsigned long ptrace_message; | |
1501 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1502 | struct task_io_accounting ioac; |
8f0ab514 | 1503 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1504 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1505 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1506 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1507 | #endif |
1508 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1509 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1510 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1511 | int cpuset_mem_spread_rotor; |
6adef3eb | 1512 | int cpuset_slab_spread_rotor; |
1da177e4 | 1513 | #endif |
ddbcc7e8 | 1514 | #ifdef CONFIG_CGROUPS |
817929ec | 1515 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1516 | struct css_set __rcu *cgroups; |
817929ec PM |
1517 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1518 | struct list_head cg_list; | |
ddbcc7e8 | 1519 | #endif |
42b2dd0a | 1520 | #ifdef CONFIG_FUTEX |
0771dfef | 1521 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1522 | #ifdef CONFIG_COMPAT |
1523 | struct compat_robust_list_head __user *compat_robust_list; | |
1524 | #endif | |
c87e2837 IM |
1525 | struct list_head pi_state_list; |
1526 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1527 | #endif |
cdd6c482 | 1528 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1529 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1530 | struct mutex perf_event_mutex; |
1531 | struct list_head perf_event_list; | |
a63eaf34 | 1532 | #endif |
8f47b187 TG |
1533 | #ifdef CONFIG_DEBUG_PREEMPT |
1534 | unsigned long preempt_disable_ip; | |
1535 | #endif | |
c7aceaba | 1536 | #ifdef CONFIG_NUMA |
58568d2a | 1537 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1538 | short il_next; |
207205a2 | 1539 | short pref_node_fork; |
42b2dd0a | 1540 | #endif |
cbee9f88 PZ |
1541 | #ifdef CONFIG_NUMA_BALANCING |
1542 | int numa_scan_seq; | |
cbee9f88 | 1543 | unsigned int numa_scan_period; |
598f0ec0 | 1544 | unsigned int numa_scan_period_max; |
de1c9ce6 | 1545 | int numa_preferred_nid; |
6b9a7460 | 1546 | unsigned long numa_migrate_retry; |
cbee9f88 | 1547 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
1548 | u64 last_task_numa_placement; |
1549 | u64 last_sum_exec_runtime; | |
cbee9f88 | 1550 | struct callback_head numa_work; |
f809ca9a | 1551 | |
8c8a743c PZ |
1552 | struct list_head numa_entry; |
1553 | struct numa_group *numa_group; | |
1554 | ||
745d6147 MG |
1555 | /* |
1556 | * Exponential decaying average of faults on a per-node basis. | |
1557 | * Scheduling placement decisions are made based on the these counts. | |
1558 | * The values remain static for the duration of a PTE scan | |
1559 | */ | |
ff1df896 | 1560 | unsigned long *numa_faults_memory; |
83e1d2cd | 1561 | unsigned long total_numa_faults; |
745d6147 MG |
1562 | |
1563 | /* | |
1564 | * numa_faults_buffer records faults per node during the current | |
ff1df896 RR |
1565 | * scan window. When the scan completes, the counts in |
1566 | * numa_faults_memory decay and these values are copied. | |
745d6147 | 1567 | */ |
ff1df896 | 1568 | unsigned long *numa_faults_buffer_memory; |
745d6147 | 1569 | |
50ec8a40 RR |
1570 | /* |
1571 | * Track the nodes the process was running on when a NUMA hinting | |
1572 | * fault was incurred. | |
1573 | */ | |
1574 | unsigned long *numa_faults_cpu; | |
1575 | unsigned long *numa_faults_buffer_cpu; | |
1576 | ||
04bb2f94 RR |
1577 | /* |
1578 | * numa_faults_locality tracks if faults recorded during the last | |
1579 | * scan window were remote/local. The task scan period is adapted | |
1580 | * based on the locality of the faults with different weights | |
1581 | * depending on whether they were shared or private faults | |
1582 | */ | |
1583 | unsigned long numa_faults_locality[2]; | |
1584 | ||
b32e86b4 | 1585 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1586 | #endif /* CONFIG_NUMA_BALANCING */ |
1587 | ||
e56d0903 | 1588 | struct rcu_head rcu; |
b92ce558 JA |
1589 | |
1590 | /* | |
1591 | * cache last used pipe for splice | |
1592 | */ | |
1593 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1594 | |
1595 | struct page_frag task_frag; | |
1596 | ||
ca74e92b SN |
1597 | #ifdef CONFIG_TASK_DELAY_ACCT |
1598 | struct task_delay_info *delays; | |
f4f154fd AM |
1599 | #endif |
1600 | #ifdef CONFIG_FAULT_INJECTION | |
1601 | int make_it_fail; | |
ca74e92b | 1602 | #endif |
9d823e8f WF |
1603 | /* |
1604 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1605 | * balance_dirty_pages() for some dirty throttling pause | |
1606 | */ | |
1607 | int nr_dirtied; | |
1608 | int nr_dirtied_pause; | |
83712358 | 1609 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1610 | |
9745512c AV |
1611 | #ifdef CONFIG_LATENCYTOP |
1612 | int latency_record_count; | |
1613 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1614 | #endif | |
6976675d AV |
1615 | /* |
1616 | * time slack values; these are used to round up poll() and | |
1617 | * select() etc timeout values. These are in nanoseconds. | |
1618 | */ | |
1619 | unsigned long timer_slack_ns; | |
1620 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1621 | |
fb52607a | 1622 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1623 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1624 | int curr_ret_stack; |
1625 | /* Stack of return addresses for return function tracing */ | |
1626 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1627 | /* time stamp for last schedule */ |
1628 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1629 | /* |
1630 | * Number of functions that haven't been traced | |
1631 | * because of depth overrun. | |
1632 | */ | |
1633 | atomic_t trace_overrun; | |
380c4b14 FW |
1634 | /* Pause for the tracing */ |
1635 | atomic_t tracing_graph_pause; | |
f201ae23 | 1636 | #endif |
ea4e2bc4 SR |
1637 | #ifdef CONFIG_TRACING |
1638 | /* state flags for use by tracers */ | |
1639 | unsigned long trace; | |
b1cff0ad | 1640 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1641 | unsigned long trace_recursion; |
1642 | #endif /* CONFIG_TRACING */ | |
c255a458 | 1643 | #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ |
569b846d KH |
1644 | struct memcg_batch_info { |
1645 | int do_batch; /* incremented when batch uncharge started */ | |
1646 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
7ffd4ca7 JW |
1647 | unsigned long nr_pages; /* uncharged usage */ |
1648 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ | |
569b846d | 1649 | } memcg_batch; |
0e9d92f2 | 1650 | unsigned int memcg_kmem_skip_account; |
519e5247 | 1651 | struct memcg_oom_info { |
49426420 JW |
1652 | struct mem_cgroup *memcg; |
1653 | gfp_t gfp_mask; | |
1654 | int order; | |
519e5247 JW |
1655 | unsigned int may_oom:1; |
1656 | } memcg_oom; | |
569b846d | 1657 | #endif |
0326f5a9 SD |
1658 | #ifdef CONFIG_UPROBES |
1659 | struct uprobe_task *utask; | |
0326f5a9 | 1660 | #endif |
cafe5635 KO |
1661 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1662 | unsigned int sequential_io; | |
1663 | unsigned int sequential_io_avg; | |
1664 | #endif | |
1da177e4 LT |
1665 | }; |
1666 | ||
76e6eee0 | 1667 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1668 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1669 | |
6688cc05 PZ |
1670 | #define TNF_MIGRATED 0x01 |
1671 | #define TNF_NO_GROUP 0x02 | |
dabe1d99 | 1672 | #define TNF_SHARED 0x04 |
04bb2f94 | 1673 | #define TNF_FAULT_LOCAL 0x08 |
6688cc05 | 1674 | |
cbee9f88 | 1675 | #ifdef CONFIG_NUMA_BALANCING |
6688cc05 | 1676 | extern void task_numa_fault(int last_node, int node, int pages, int flags); |
e29cf08b | 1677 | extern pid_t task_numa_group_id(struct task_struct *p); |
1a687c2e | 1678 | extern void set_numabalancing_state(bool enabled); |
82727018 | 1679 | extern void task_numa_free(struct task_struct *p); |
10f39042 RR |
1680 | extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page, |
1681 | int src_nid, int dst_cpu); | |
cbee9f88 | 1682 | #else |
ac8e895b | 1683 | static inline void task_numa_fault(int last_node, int node, int pages, |
6688cc05 | 1684 | int flags) |
cbee9f88 PZ |
1685 | { |
1686 | } | |
e29cf08b MG |
1687 | static inline pid_t task_numa_group_id(struct task_struct *p) |
1688 | { | |
1689 | return 0; | |
1690 | } | |
1a687c2e MG |
1691 | static inline void set_numabalancing_state(bool enabled) |
1692 | { | |
1693 | } | |
82727018 RR |
1694 | static inline void task_numa_free(struct task_struct *p) |
1695 | { | |
1696 | } | |
10f39042 RR |
1697 | static inline bool should_numa_migrate_memory(struct task_struct *p, |
1698 | struct page *page, int src_nid, int dst_cpu) | |
1699 | { | |
1700 | return true; | |
1701 | } | |
cbee9f88 PZ |
1702 | #endif |
1703 | ||
e868171a | 1704 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1705 | { |
1706 | return task->pids[PIDTYPE_PID].pid; | |
1707 | } | |
1708 | ||
e868171a | 1709 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1710 | { |
1711 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1712 | } | |
1713 | ||
6dda81f4 ON |
1714 | /* |
1715 | * Without tasklist or rcu lock it is not safe to dereference | |
1716 | * the result of task_pgrp/task_session even if task == current, | |
1717 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1718 | */ | |
e868171a | 1719 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1720 | { |
1721 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1722 | } | |
1723 | ||
e868171a | 1724 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1725 | { |
1726 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1727 | } | |
1728 | ||
7af57294 PE |
1729 | struct pid_namespace; |
1730 | ||
1731 | /* | |
1732 | * the helpers to get the task's different pids as they are seen | |
1733 | * from various namespaces | |
1734 | * | |
1735 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1736 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1737 | * current. | |
7af57294 PE |
1738 | * task_xid_nr_ns() : id seen from the ns specified; |
1739 | * | |
1740 | * set_task_vxid() : assigns a virtual id to a task; | |
1741 | * | |
7af57294 PE |
1742 | * see also pid_nr() etc in include/linux/pid.h |
1743 | */ | |
52ee2dfd ON |
1744 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1745 | struct pid_namespace *ns); | |
7af57294 | 1746 | |
e868171a | 1747 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1748 | { |
1749 | return tsk->pid; | |
1750 | } | |
1751 | ||
52ee2dfd ON |
1752 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1753 | struct pid_namespace *ns) | |
1754 | { | |
1755 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1756 | } | |
7af57294 PE |
1757 | |
1758 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1759 | { | |
52ee2dfd | 1760 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1761 | } |
1762 | ||
1763 | ||
e868171a | 1764 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1765 | { |
1766 | return tsk->tgid; | |
1767 | } | |
1768 | ||
2f2a3a46 | 1769 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1770 | |
1771 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1772 | { | |
1773 | return pid_vnr(task_tgid(tsk)); | |
1774 | } | |
1775 | ||
1776 | ||
80e0b6e8 | 1777 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1778 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1779 | { | |
1780 | pid_t pid = 0; | |
1781 | ||
1782 | rcu_read_lock(); | |
1783 | if (pid_alive(tsk)) | |
1784 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1785 | rcu_read_unlock(); | |
1786 | ||
1787 | return pid; | |
1788 | } | |
1789 | ||
1790 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1791 | { | |
1792 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1793 | } | |
1794 | ||
52ee2dfd ON |
1795 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1796 | struct pid_namespace *ns) | |
7af57294 | 1797 | { |
52ee2dfd | 1798 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1799 | } |
1800 | ||
7af57294 PE |
1801 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1802 | { | |
52ee2dfd | 1803 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1804 | } |
1805 | ||
1806 | ||
52ee2dfd ON |
1807 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1808 | struct pid_namespace *ns) | |
7af57294 | 1809 | { |
52ee2dfd | 1810 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1811 | } |
1812 | ||
7af57294 PE |
1813 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1814 | { | |
52ee2dfd | 1815 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1816 | } |
1817 | ||
1b0f7ffd ON |
1818 | /* obsolete, do not use */ |
1819 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1820 | { | |
1821 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1822 | } | |
7af57294 | 1823 | |
1da177e4 LT |
1824 | /** |
1825 | * pid_alive - check that a task structure is not stale | |
1826 | * @p: Task structure to be checked. | |
1827 | * | |
1828 | * Test if a process is not yet dead (at most zombie state) | |
1829 | * If pid_alive fails, then pointers within the task structure | |
1830 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1831 | * |
1832 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1833 | */ |
ad36d282 | 1834 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 1835 | { |
92476d7f | 1836 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1837 | } |
1838 | ||
f400e198 | 1839 | /** |
b460cbc5 | 1840 | * is_global_init - check if a task structure is init |
3260259f HK |
1841 | * @tsk: Task structure to be checked. |
1842 | * | |
1843 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1844 | * |
1845 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1846 | */ |
e868171a | 1847 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1848 | { |
1849 | return tsk->pid == 1; | |
1850 | } | |
b460cbc5 | 1851 | |
9ec52099 CLG |
1852 | extern struct pid *cad_pid; |
1853 | ||
1da177e4 | 1854 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1855 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1856 | |
158d9ebd | 1857 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1858 | |
1859 | static inline void put_task_struct(struct task_struct *t) | |
1860 | { | |
1861 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1862 | __put_task_struct(t); |
e56d0903 | 1863 | } |
1da177e4 | 1864 | |
6a61671b FW |
1865 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1866 | extern void task_cputime(struct task_struct *t, | |
1867 | cputime_t *utime, cputime_t *stime); | |
1868 | extern void task_cputime_scaled(struct task_struct *t, | |
1869 | cputime_t *utimescaled, cputime_t *stimescaled); | |
1870 | extern cputime_t task_gtime(struct task_struct *t); | |
1871 | #else | |
6fac4829 FW |
1872 | static inline void task_cputime(struct task_struct *t, |
1873 | cputime_t *utime, cputime_t *stime) | |
1874 | { | |
1875 | if (utime) | |
1876 | *utime = t->utime; | |
1877 | if (stime) | |
1878 | *stime = t->stime; | |
1879 | } | |
1880 | ||
1881 | static inline void task_cputime_scaled(struct task_struct *t, | |
1882 | cputime_t *utimescaled, | |
1883 | cputime_t *stimescaled) | |
1884 | { | |
1885 | if (utimescaled) | |
1886 | *utimescaled = t->utimescaled; | |
1887 | if (stimescaled) | |
1888 | *stimescaled = t->stimescaled; | |
1889 | } | |
6a61671b FW |
1890 | |
1891 | static inline cputime_t task_gtime(struct task_struct *t) | |
1892 | { | |
1893 | return t->gtime; | |
1894 | } | |
1895 | #endif | |
e80d0a1a FW |
1896 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1897 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 1898 | |
1da177e4 LT |
1899 | /* |
1900 | * Per process flags | |
1901 | */ | |
1da177e4 | 1902 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1903 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1904 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1905 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1906 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1907 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1908 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1909 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1910 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1911 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1912 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1913 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 1914 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
1915 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1916 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1917 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1918 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 1919 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 1920 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1921 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1922 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1923 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1924 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1925 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
14a40ffc | 1926 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 1927 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 1928 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1929 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 1930 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
1931 | |
1932 | /* | |
1933 | * Only the _current_ task can read/write to tsk->flags, but other | |
1934 | * tasks can access tsk->flags in readonly mode for example | |
1935 | * with tsk_used_math (like during threaded core dumping). | |
1936 | * There is however an exception to this rule during ptrace | |
1937 | * or during fork: the ptracer task is allowed to write to the | |
1938 | * child->flags of its traced child (same goes for fork, the parent | |
1939 | * can write to the child->flags), because we're guaranteed the | |
1940 | * child is not running and in turn not changing child->flags | |
1941 | * at the same time the parent does it. | |
1942 | */ | |
1943 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1944 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1945 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1946 | #define set_used_math() set_stopped_child_used_math(current) | |
1947 | #define conditional_stopped_child_used_math(condition, child) \ | |
1948 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1949 | #define conditional_used_math(condition) \ | |
1950 | conditional_stopped_child_used_math(condition, current) | |
1951 | #define copy_to_stopped_child_used_math(child) \ | |
1952 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1953 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1954 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1955 | #define used_math() tsk_used_math(current) | |
1956 | ||
21caf2fc ML |
1957 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */ |
1958 | static inline gfp_t memalloc_noio_flags(gfp_t flags) | |
1959 | { | |
1960 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
1961 | flags &= ~__GFP_IO; | |
1962 | return flags; | |
1963 | } | |
1964 | ||
1965 | static inline unsigned int memalloc_noio_save(void) | |
1966 | { | |
1967 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
1968 | current->flags |= PF_MEMALLOC_NOIO; | |
1969 | return flags; | |
1970 | } | |
1971 | ||
1972 | static inline void memalloc_noio_restore(unsigned int flags) | |
1973 | { | |
1974 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
1975 | } | |
1976 | ||
e5c1902e | 1977 | /* |
a8f072c1 | 1978 | * task->jobctl flags |
e5c1902e | 1979 | */ |
a8f072c1 | 1980 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1981 | |
a8f072c1 TH |
1982 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1983 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1984 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1985 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1986 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1987 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1988 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
1989 | |
1990 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
1991 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
1992 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 1993 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 1994 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 1995 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 1996 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 1997 | |
fb1d910c | 1998 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1999 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 2000 | |
7dd3db54 TH |
2001 | extern bool task_set_jobctl_pending(struct task_struct *task, |
2002 | unsigned int mask); | |
73ddff2b | 2003 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
2004 | extern void task_clear_jobctl_pending(struct task_struct *task, |
2005 | unsigned int mask); | |
39efa3ef | 2006 | |
a57eb940 | 2007 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
2008 | |
2009 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1aa03f11 | 2010 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
f41d911f PM |
2011 | |
2012 | static inline void rcu_copy_process(struct task_struct *p) | |
2013 | { | |
2014 | p->rcu_read_lock_nesting = 0; | |
2015 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 2016 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 2017 | p->rcu_blocked_node = NULL; |
24278d14 PM |
2018 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
2019 | #ifdef CONFIG_RCU_BOOST | |
2020 | p->rcu_boost_mutex = NULL; | |
2021 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
2022 | INIT_LIST_HEAD(&p->rcu_node_entry); |
2023 | } | |
2024 | ||
f41d911f PM |
2025 | #else |
2026 | ||
2027 | static inline void rcu_copy_process(struct task_struct *p) | |
2028 | { | |
2029 | } | |
2030 | ||
2031 | #endif | |
2032 | ||
907aed48 MG |
2033 | static inline void tsk_restore_flags(struct task_struct *task, |
2034 | unsigned long orig_flags, unsigned long flags) | |
2035 | { | |
2036 | task->flags &= ~flags; | |
2037 | task->flags |= orig_flags & flags; | |
2038 | } | |
2039 | ||
1da177e4 | 2040 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
2041 | extern void do_set_cpus_allowed(struct task_struct *p, |
2042 | const struct cpumask *new_mask); | |
2043 | ||
cd8ba7cd | 2044 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2045 | const struct cpumask *new_mask); |
1da177e4 | 2046 | #else |
1e1b6c51 KM |
2047 | static inline void do_set_cpus_allowed(struct task_struct *p, |
2048 | const struct cpumask *new_mask) | |
2049 | { | |
2050 | } | |
cd8ba7cd | 2051 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2052 | const struct cpumask *new_mask) |
1da177e4 | 2053 | { |
96f874e2 | 2054 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
2055 | return -EINVAL; |
2056 | return 0; | |
2057 | } | |
2058 | #endif | |
e0ad9556 | 2059 | |
3451d024 | 2060 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
2061 | void calc_load_enter_idle(void); |
2062 | void calc_load_exit_idle(void); | |
2063 | #else | |
2064 | static inline void calc_load_enter_idle(void) { } | |
2065 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 2066 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 2067 | |
e0ad9556 | 2068 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
2069 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
2070 | { | |
2071 | return set_cpus_allowed_ptr(p, &new_mask); | |
2072 | } | |
e0ad9556 | 2073 | #endif |
1da177e4 | 2074 | |
b342501c | 2075 | /* |
c676329a PZ |
2076 | * Do not use outside of architecture code which knows its limitations. |
2077 | * | |
2078 | * sched_clock() has no promise of monotonicity or bounded drift between | |
2079 | * CPUs, use (which you should not) requires disabling IRQs. | |
2080 | * | |
2081 | * Please use one of the three interfaces below. | |
b342501c | 2082 | */ |
1bbfa6f2 | 2083 | extern unsigned long long notrace sched_clock(void); |
c676329a | 2084 | /* |
489a71b0 | 2085 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
2086 | */ |
2087 | extern u64 cpu_clock(int cpu); | |
2088 | extern u64 local_clock(void); | |
2089 | extern u64 sched_clock_cpu(int cpu); | |
2090 | ||
e436d800 | 2091 | |
c1955a3d | 2092 | extern void sched_clock_init(void); |
3e51f33f | 2093 | |
c1955a3d | 2094 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
2095 | static inline void sched_clock_tick(void) |
2096 | { | |
2097 | } | |
2098 | ||
2099 | static inline void sched_clock_idle_sleep_event(void) | |
2100 | { | |
2101 | } | |
2102 | ||
2103 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
2104 | { | |
2105 | } | |
2106 | #else | |
c676329a PZ |
2107 | /* |
2108 | * Architectures can set this to 1 if they have specified | |
2109 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
2110 | * but then during bootup it turns out that sched_clock() | |
2111 | * is reliable after all: | |
2112 | */ | |
35af99e6 PZ |
2113 | extern int sched_clock_stable(void); |
2114 | extern void set_sched_clock_stable(void); | |
2115 | extern void clear_sched_clock_stable(void); | |
c676329a | 2116 | |
3e51f33f PZ |
2117 | extern void sched_clock_tick(void); |
2118 | extern void sched_clock_idle_sleep_event(void); | |
2119 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
2120 | #endif | |
2121 | ||
b52bfee4 VP |
2122 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
2123 | /* | |
2124 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
2125 | * The reason for this explicit opt-in is not to have perf penalty with | |
2126 | * slow sched_clocks. | |
2127 | */ | |
2128 | extern void enable_sched_clock_irqtime(void); | |
2129 | extern void disable_sched_clock_irqtime(void); | |
2130 | #else | |
2131 | static inline void enable_sched_clock_irqtime(void) {} | |
2132 | static inline void disable_sched_clock_irqtime(void) {} | |
2133 | #endif | |
2134 | ||
36c8b586 | 2135 | extern unsigned long long |
41b86e9c | 2136 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2137 | |
2138 | /* sched_exec is called by processes performing an exec */ | |
2139 | #ifdef CONFIG_SMP | |
2140 | extern void sched_exec(void); | |
2141 | #else | |
2142 | #define sched_exec() {} | |
2143 | #endif | |
2144 | ||
2aa44d05 IM |
2145 | extern void sched_clock_idle_sleep_event(void); |
2146 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2147 | |
1da177e4 LT |
2148 | #ifdef CONFIG_HOTPLUG_CPU |
2149 | extern void idle_task_exit(void); | |
2150 | #else | |
2151 | static inline void idle_task_exit(void) {} | |
2152 | #endif | |
2153 | ||
3451d024 | 2154 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 2155 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 2156 | #else |
1c20091e | 2157 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
2158 | #endif |
2159 | ||
ce831b38 FW |
2160 | #ifdef CONFIG_NO_HZ_FULL |
2161 | extern bool sched_can_stop_tick(void); | |
265f22a9 | 2162 | extern u64 scheduler_tick_max_deferment(void); |
ce831b38 FW |
2163 | #else |
2164 | static inline bool sched_can_stop_tick(void) { return false; } | |
06d8308c TG |
2165 | #endif |
2166 | ||
5091faa4 | 2167 | #ifdef CONFIG_SCHED_AUTOGROUP |
5091faa4 MG |
2168 | extern void sched_autogroup_create_attach(struct task_struct *p); |
2169 | extern void sched_autogroup_detach(struct task_struct *p); | |
2170 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2171 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2172 | #ifdef CONFIG_PROC_FS | |
2173 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2174 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2175 | #endif |
2176 | #else | |
2177 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2178 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2179 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2180 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2181 | #endif | |
2182 | ||
d95f4122 | 2183 | extern bool yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2184 | extern void set_user_nice(struct task_struct *p, long nice); |
2185 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
2186 | /** |
2187 | * task_nice - return the nice value of a given task. | |
2188 | * @p: the task in question. | |
2189 | * | |
2190 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
2191 | */ | |
2192 | static inline int task_nice(const struct task_struct *p) | |
2193 | { | |
2194 | return PRIO_TO_NICE((p)->static_prio); | |
2195 | } | |
36c8b586 IM |
2196 | extern int can_nice(const struct task_struct *p, const int nice); |
2197 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2198 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2199 | extern int sched_setscheduler(struct task_struct *, int, |
2200 | const struct sched_param *); | |
961ccddd | 2201 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2202 | const struct sched_param *); |
d50dde5a DF |
2203 | extern int sched_setattr(struct task_struct *, |
2204 | const struct sched_attr *); | |
36c8b586 | 2205 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2206 | /** |
2207 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2208 | * @p: the task in question. |
e69f6186 YB |
2209 | * |
2210 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 2211 | */ |
7061ca3b | 2212 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2213 | { |
2214 | return p->pid == 0; | |
2215 | } | |
36c8b586 IM |
2216 | extern struct task_struct *curr_task(int cpu); |
2217 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2218 | |
2219 | void yield(void); | |
2220 | ||
2221 | /* | |
2222 | * The default (Linux) execution domain. | |
2223 | */ | |
2224 | extern struct exec_domain default_exec_domain; | |
2225 | ||
2226 | union thread_union { | |
2227 | struct thread_info thread_info; | |
2228 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2229 | }; | |
2230 | ||
2231 | #ifndef __HAVE_ARCH_KSTACK_END | |
2232 | static inline int kstack_end(void *addr) | |
2233 | { | |
2234 | /* Reliable end of stack detection: | |
2235 | * Some APM bios versions misalign the stack | |
2236 | */ | |
2237 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2238 | } | |
2239 | #endif | |
2240 | ||
2241 | extern union thread_union init_thread_union; | |
2242 | extern struct task_struct init_task; | |
2243 | ||
2244 | extern struct mm_struct init_mm; | |
2245 | ||
198fe21b PE |
2246 | extern struct pid_namespace init_pid_ns; |
2247 | ||
2248 | /* | |
2249 | * find a task by one of its numerical ids | |
2250 | * | |
198fe21b PE |
2251 | * find_task_by_pid_ns(): |
2252 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2253 | * find_task_by_vpid(): |
2254 | * finds a task by its virtual pid | |
198fe21b | 2255 | * |
e49859e7 | 2256 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2257 | */ |
2258 | ||
228ebcbe PE |
2259 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2260 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2261 | struct pid_namespace *ns); | |
198fe21b | 2262 | |
1da177e4 | 2263 | /* per-UID process charging. */ |
7b44ab97 | 2264 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2265 | static inline struct user_struct *get_uid(struct user_struct *u) |
2266 | { | |
2267 | atomic_inc(&u->__count); | |
2268 | return u; | |
2269 | } | |
2270 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2271 | |
2272 | #include <asm/current.h> | |
2273 | ||
f0af911a | 2274 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2275 | |
b3c97528 HH |
2276 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2277 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2278 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2279 | #ifdef CONFIG_SMP |
2280 | extern void kick_process(struct task_struct *tsk); | |
2281 | #else | |
2282 | static inline void kick_process(struct task_struct *tsk) { } | |
2283 | #endif | |
aab03e05 | 2284 | extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
ad46c2c4 | 2285 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2286 | |
1da177e4 LT |
2287 | extern void proc_caches_init(void); |
2288 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2289 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2290 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2291 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2292 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2293 | ||
2294 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2295 | { | |
2296 | unsigned long flags; | |
2297 | int ret; | |
2298 | ||
2299 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2300 | ret = dequeue_signal(tsk, mask, info); | |
2301 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2302 | ||
2303 | return ret; | |
53c8f9f1 | 2304 | } |
1da177e4 LT |
2305 | |
2306 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2307 | sigset_t *mask); | |
2308 | extern void unblock_all_signals(void); | |
2309 | extern void release_task(struct task_struct * p); | |
2310 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2311 | extern int force_sigsegv(int, struct task_struct *); |
2312 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2313 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2314 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2315 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2316 | const struct cred *, u32); | |
c4b92fc1 EB |
2317 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2318 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2319 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2320 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2321 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2322 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2323 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2324 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2325 | extern struct sigqueue *sigqueue_alloc(void); |
2326 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2327 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2328 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 | 2329 | |
51a7b448 AV |
2330 | static inline void restore_saved_sigmask(void) |
2331 | { | |
2332 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2333 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2334 | } |
2335 | ||
b7f9a11a AV |
2336 | static inline sigset_t *sigmask_to_save(void) |
2337 | { | |
2338 | sigset_t *res = ¤t->blocked; | |
2339 | if (unlikely(test_restore_sigmask())) | |
2340 | res = ¤t->saved_sigmask; | |
2341 | return res; | |
2342 | } | |
2343 | ||
9ec52099 CLG |
2344 | static inline int kill_cad_pid(int sig, int priv) |
2345 | { | |
2346 | return kill_pid(cad_pid, sig, priv); | |
2347 | } | |
2348 | ||
1da177e4 LT |
2349 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2350 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2351 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2352 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2353 | ||
2a855dd0 SAS |
2354 | /* |
2355 | * True if we are on the alternate signal stack. | |
2356 | */ | |
1da177e4 LT |
2357 | static inline int on_sig_stack(unsigned long sp) |
2358 | { | |
2a855dd0 SAS |
2359 | #ifdef CONFIG_STACK_GROWSUP |
2360 | return sp >= current->sas_ss_sp && | |
2361 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2362 | #else | |
2363 | return sp > current->sas_ss_sp && | |
2364 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2365 | #endif | |
1da177e4 LT |
2366 | } |
2367 | ||
2368 | static inline int sas_ss_flags(unsigned long sp) | |
2369 | { | |
2370 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2371 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2372 | } | |
2373 | ||
5a1b98d3 AV |
2374 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) |
2375 | { | |
2376 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
2377 | #ifdef CONFIG_STACK_GROWSUP | |
2378 | return current->sas_ss_sp; | |
2379 | #else | |
2380 | return current->sas_ss_sp + current->sas_ss_size; | |
2381 | #endif | |
2382 | return sp; | |
2383 | } | |
2384 | ||
1da177e4 LT |
2385 | /* |
2386 | * Routines for handling mm_structs | |
2387 | */ | |
2388 | extern struct mm_struct * mm_alloc(void); | |
2389 | ||
2390 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2391 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2392 | static inline void mmdrop(struct mm_struct * mm) |
2393 | { | |
6fb43d7b | 2394 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2395 | __mmdrop(mm); |
2396 | } | |
2397 | ||
2398 | /* mmput gets rid of the mappings and all user-space */ | |
2399 | extern void mmput(struct mm_struct *); | |
2400 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2401 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2402 | /* |
2403 | * Grab a reference to a task's mm, if it is not already going away | |
2404 | * and ptrace_may_access with the mode parameter passed to it | |
2405 | * succeeds. | |
2406 | */ | |
2407 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2408 | /* Remove the current tasks stale references to the old mm_struct */ |
2409 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
2410 | ||
6f2c55b8 | 2411 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2412 | struct task_struct *); |
1da177e4 LT |
2413 | extern void flush_thread(void); |
2414 | extern void exit_thread(void); | |
2415 | ||
1da177e4 | 2416 | extern void exit_files(struct task_struct *); |
a7e5328a | 2417 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2418 | |
1da177e4 | 2419 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2420 | extern void flush_itimer_signals(void); |
1da177e4 | 2421 | |
9402c95f | 2422 | extern void do_group_exit(int); |
1da177e4 | 2423 | |
1da177e4 LT |
2424 | extern int allow_signal(int); |
2425 | extern int disallow_signal(int); | |
1da177e4 | 2426 | |
c4ad8f98 | 2427 | extern int do_execve(struct filename *, |
d7627467 | 2428 | const char __user * const __user *, |
da3d4c5f | 2429 | const char __user * const __user *); |
e80d6661 | 2430 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2431 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2432 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 | 2433 | |
23aebe16 | 2434 | extern void set_task_comm(struct task_struct *tsk, const char *from); |
59714d65 | 2435 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2436 | |
2437 | #ifdef CONFIG_SMP | |
317f3941 | 2438 | void scheduler_ipi(void); |
85ba2d86 | 2439 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2440 | #else |
184748cc | 2441 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2442 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2443 | long match_state) | |
2444 | { | |
2445 | return 1; | |
2446 | } | |
1da177e4 LT |
2447 | #endif |
2448 | ||
05725f7e JP |
2449 | #define next_task(p) \ |
2450 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2451 | |
2452 | #define for_each_process(p) \ | |
2453 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2454 | ||
5bb459bb | 2455 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2456 | |
1da177e4 LT |
2457 | /* |
2458 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2459 | * 'break' will not work as expected - use goto instead. | |
2460 | */ | |
2461 | #define do_each_thread(g, t) \ | |
2462 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2463 | ||
2464 | #define while_each_thread(g, t) \ | |
2465 | while ((t = next_thread(t)) != g) | |
2466 | ||
0c740d0a ON |
2467 | #define __for_each_thread(signal, t) \ |
2468 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
2469 | ||
2470 | #define for_each_thread(p, t) \ | |
2471 | __for_each_thread((p)->signal, t) | |
2472 | ||
2473 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
2474 | #define for_each_process_thread(p, t) \ | |
2475 | for_each_process(p) for_each_thread(p, t) | |
2476 | ||
7e49827c ON |
2477 | static inline int get_nr_threads(struct task_struct *tsk) |
2478 | { | |
b3ac022c | 2479 | return tsk->signal->nr_threads; |
7e49827c ON |
2480 | } |
2481 | ||
087806b1 ON |
2482 | static inline bool thread_group_leader(struct task_struct *p) |
2483 | { | |
2484 | return p->exit_signal >= 0; | |
2485 | } | |
1da177e4 | 2486 | |
0804ef4b EB |
2487 | /* Do to the insanities of de_thread it is possible for a process |
2488 | * to have the pid of the thread group leader without actually being | |
2489 | * the thread group leader. For iteration through the pids in proc | |
2490 | * all we care about is that we have a task with the appropriate | |
2491 | * pid, we don't actually care if we have the right task. | |
2492 | */ | |
e1403b8e | 2493 | static inline bool has_group_leader_pid(struct task_struct *p) |
0804ef4b | 2494 | { |
e1403b8e | 2495 | return task_pid(p) == p->signal->leader_pid; |
0804ef4b EB |
2496 | } |
2497 | ||
bac0abd6 | 2498 | static inline |
e1403b8e | 2499 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) |
bac0abd6 | 2500 | { |
e1403b8e | 2501 | return p1->signal == p2->signal; |
bac0abd6 PE |
2502 | } |
2503 | ||
36c8b586 | 2504 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2505 | { |
05725f7e JP |
2506 | return list_entry_rcu(p->thread_group.next, |
2507 | struct task_struct, thread_group); | |
47e65328 ON |
2508 | } |
2509 | ||
e868171a | 2510 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2511 | { |
47e65328 | 2512 | return list_empty(&p->thread_group); |
1da177e4 LT |
2513 | } |
2514 | ||
2515 | #define delay_group_leader(p) \ | |
2516 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2517 | ||
1da177e4 | 2518 | /* |
260ea101 | 2519 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2520 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2521 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2522 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2523 | * |
2524 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2525 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2526 | * neither inside nor outside. | |
2527 | */ | |
2528 | static inline void task_lock(struct task_struct *p) | |
2529 | { | |
2530 | spin_lock(&p->alloc_lock); | |
2531 | } | |
2532 | ||
2533 | static inline void task_unlock(struct task_struct *p) | |
2534 | { | |
2535 | spin_unlock(&p->alloc_lock); | |
2536 | } | |
2537 | ||
b8ed374e | 2538 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2539 | unsigned long *flags); |
2540 | ||
9388dc30 AV |
2541 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2542 | unsigned long *flags) | |
2543 | { | |
2544 | struct sighand_struct *ret; | |
2545 | ||
2546 | ret = __lock_task_sighand(tsk, flags); | |
2547 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2548 | return ret; | |
2549 | } | |
b8ed374e | 2550 | |
f63ee72e ON |
2551 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2552 | unsigned long *flags) | |
2553 | { | |
2554 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2555 | } | |
2556 | ||
4714d1d3 | 2557 | #ifdef CONFIG_CGROUPS |
257058ae | 2558 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2559 | { |
257058ae | 2560 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2561 | } |
257058ae | 2562 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2563 | { |
257058ae | 2564 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2565 | } |
77e4ef99 TH |
2566 | |
2567 | /** | |
2568 | * threadgroup_lock - lock threadgroup | |
2569 | * @tsk: member task of the threadgroup to lock | |
2570 | * | |
2571 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2572 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
e56fb287 ON |
2573 | * change ->group_leader/pid. This is useful for cases where the threadgroup |
2574 | * needs to stay stable across blockable operations. | |
77e4ef99 TH |
2575 | * |
2576 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2577 | * synchronization. While held, no new task will be added to threadgroup | |
2578 | * and no existing live task will have its PF_EXITING set. | |
2579 | * | |
e56fb287 ON |
2580 | * de_thread() does threadgroup_change_{begin|end}() when a non-leader |
2581 | * sub-thread becomes a new leader. | |
77e4ef99 | 2582 | */ |
257058ae | 2583 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2584 | { |
257058ae | 2585 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2586 | } |
77e4ef99 TH |
2587 | |
2588 | /** | |
2589 | * threadgroup_unlock - unlock threadgroup | |
2590 | * @tsk: member task of the threadgroup to unlock | |
2591 | * | |
2592 | * Reverse threadgroup_lock(). | |
2593 | */ | |
257058ae | 2594 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2595 | { |
257058ae | 2596 | up_write(&tsk->signal->group_rwsem); |
4714d1d3 BB |
2597 | } |
2598 | #else | |
257058ae TH |
2599 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2600 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2601 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2602 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2603 | #endif |
2604 | ||
f037360f AV |
2605 | #ifndef __HAVE_THREAD_FUNCTIONS |
2606 | ||
f7e4217b RZ |
2607 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2608 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2609 | |
10ebffde AV |
2610 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2611 | { | |
2612 | *task_thread_info(p) = *task_thread_info(org); | |
2613 | task_thread_info(p)->task = p; | |
2614 | } | |
2615 | ||
2616 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2617 | { | |
f7e4217b | 2618 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2619 | } |
2620 | ||
f037360f AV |
2621 | #endif |
2622 | ||
8b05c7e6 FT |
2623 | static inline int object_is_on_stack(void *obj) |
2624 | { | |
2625 | void *stack = task_stack_page(current); | |
2626 | ||
2627 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2628 | } | |
2629 | ||
8c9843e5 BH |
2630 | extern void thread_info_cache_init(void); |
2631 | ||
7c9f8861 ES |
2632 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2633 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2634 | { | |
2635 | unsigned long *n = end_of_stack(p); | |
2636 | ||
2637 | do { /* Skip over canary */ | |
2638 | n++; | |
2639 | } while (!*n); | |
2640 | ||
2641 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2642 | } | |
2643 | #endif | |
2644 | ||
1da177e4 LT |
2645 | /* set thread flags in other task's structures |
2646 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2647 | */ | |
2648 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2649 | { | |
a1261f54 | 2650 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2651 | } |
2652 | ||
2653 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2654 | { | |
a1261f54 | 2655 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2656 | } |
2657 | ||
2658 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2659 | { | |
a1261f54 | 2660 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2661 | } |
2662 | ||
2663 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2664 | { | |
a1261f54 | 2665 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2666 | } |
2667 | ||
2668 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2669 | { | |
a1261f54 | 2670 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2671 | } |
2672 | ||
2673 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2674 | { | |
2675 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2676 | } | |
2677 | ||
2678 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2679 | { | |
2680 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2681 | } | |
2682 | ||
8ae121ac GH |
2683 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2684 | { | |
2685 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2686 | } | |
2687 | ||
690cc3ff EB |
2688 | static inline int restart_syscall(void) |
2689 | { | |
2690 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2691 | return -ERESTARTNOINTR; | |
2692 | } | |
2693 | ||
1da177e4 LT |
2694 | static inline int signal_pending(struct task_struct *p) |
2695 | { | |
2696 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2697 | } | |
f776d12d | 2698 | |
d9588725 RM |
2699 | static inline int __fatal_signal_pending(struct task_struct *p) |
2700 | { | |
2701 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2702 | } | |
f776d12d MW |
2703 | |
2704 | static inline int fatal_signal_pending(struct task_struct *p) | |
2705 | { | |
2706 | return signal_pending(p) && __fatal_signal_pending(p); | |
2707 | } | |
2708 | ||
16882c1e ON |
2709 | static inline int signal_pending_state(long state, struct task_struct *p) |
2710 | { | |
2711 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2712 | return 0; | |
2713 | if (!signal_pending(p)) | |
2714 | return 0; | |
2715 | ||
16882c1e ON |
2716 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2717 | } | |
2718 | ||
1da177e4 LT |
2719 | /* |
2720 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2721 | * explicit rescheduling in places that are safe. The return | |
2722 | * value indicates whether a reschedule was done in fact. | |
2723 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2724 | * cond_resched_softirq() will enable bhs before scheduling. | |
2725 | */ | |
c3921ab7 | 2726 | extern int _cond_resched(void); |
6f80bd98 | 2727 | |
613afbf8 FW |
2728 | #define cond_resched() ({ \ |
2729 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2730 | _cond_resched(); \ | |
2731 | }) | |
6f80bd98 | 2732 | |
613afbf8 FW |
2733 | extern int __cond_resched_lock(spinlock_t *lock); |
2734 | ||
bdd4e85d | 2735 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2736 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2737 | #else |
716a4234 | 2738 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2739 | #endif |
716a4234 | 2740 | |
613afbf8 | 2741 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2742 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2743 | __cond_resched_lock(lock); \ |
2744 | }) | |
2745 | ||
2746 | extern int __cond_resched_softirq(void); | |
2747 | ||
75e1056f VP |
2748 | #define cond_resched_softirq() ({ \ |
2749 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2750 | __cond_resched_softirq(); \ | |
613afbf8 | 2751 | }) |
1da177e4 | 2752 | |
f6f3c437 SH |
2753 | static inline void cond_resched_rcu(void) |
2754 | { | |
2755 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2756 | rcu_read_unlock(); | |
2757 | cond_resched(); | |
2758 | rcu_read_lock(); | |
2759 | #endif | |
2760 | } | |
2761 | ||
1da177e4 LT |
2762 | /* |
2763 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2764 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2765 | * but a general need for low latency) | |
1da177e4 | 2766 | */ |
95c354fe | 2767 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2768 | { |
95c354fe NP |
2769 | #ifdef CONFIG_PREEMPT |
2770 | return spin_is_contended(lock); | |
2771 | #else | |
1da177e4 | 2772 | return 0; |
95c354fe | 2773 | #endif |
1da177e4 LT |
2774 | } |
2775 | ||
ee761f62 TG |
2776 | /* |
2777 | * Idle thread specific functions to determine the need_resched | |
69dd0f84 | 2778 | * polling state. |
ee761f62 | 2779 | */ |
69dd0f84 | 2780 | #ifdef TIF_POLLING_NRFLAG |
ee761f62 TG |
2781 | static inline int tsk_is_polling(struct task_struct *p) |
2782 | { | |
2783 | return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); | |
2784 | } | |
ea811747 PZ |
2785 | |
2786 | static inline void __current_set_polling(void) | |
3a98f871 TG |
2787 | { |
2788 | set_thread_flag(TIF_POLLING_NRFLAG); | |
2789 | } | |
2790 | ||
ea811747 PZ |
2791 | static inline bool __must_check current_set_polling_and_test(void) |
2792 | { | |
2793 | __current_set_polling(); | |
2794 | ||
2795 | /* | |
2796 | * Polling state must be visible before we test NEED_RESCHED, | |
2797 | * paired by resched_task() | |
ea811747 | 2798 | */ |
4e857c58 | 2799 | smp_mb__after_atomic(); |
ea811747 PZ |
2800 | |
2801 | return unlikely(tif_need_resched()); | |
2802 | } | |
2803 | ||
2804 | static inline void __current_clr_polling(void) | |
3a98f871 TG |
2805 | { |
2806 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
2807 | } | |
ea811747 PZ |
2808 | |
2809 | static inline bool __must_check current_clr_polling_and_test(void) | |
2810 | { | |
2811 | __current_clr_polling(); | |
2812 | ||
2813 | /* | |
2814 | * Polling state must be visible before we test NEED_RESCHED, | |
2815 | * paired by resched_task() | |
2816 | */ | |
4e857c58 | 2817 | smp_mb__after_atomic(); |
ea811747 PZ |
2818 | |
2819 | return unlikely(tif_need_resched()); | |
2820 | } | |
2821 | ||
ee761f62 TG |
2822 | #else |
2823 | static inline int tsk_is_polling(struct task_struct *p) { return 0; } | |
ea811747 PZ |
2824 | static inline void __current_set_polling(void) { } |
2825 | static inline void __current_clr_polling(void) { } | |
2826 | ||
2827 | static inline bool __must_check current_set_polling_and_test(void) | |
2828 | { | |
2829 | return unlikely(tif_need_resched()); | |
2830 | } | |
2831 | static inline bool __must_check current_clr_polling_and_test(void) | |
2832 | { | |
2833 | return unlikely(tif_need_resched()); | |
2834 | } | |
ee761f62 TG |
2835 | #endif |
2836 | ||
8cb75e0c PZ |
2837 | static inline void current_clr_polling(void) |
2838 | { | |
2839 | __current_clr_polling(); | |
2840 | ||
2841 | /* | |
2842 | * Ensure we check TIF_NEED_RESCHED after we clear the polling bit. | |
2843 | * Once the bit is cleared, we'll get IPIs with every new | |
2844 | * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also | |
2845 | * fold. | |
2846 | */ | |
2847 | smp_mb(); /* paired with resched_task() */ | |
2848 | ||
2849 | preempt_fold_need_resched(); | |
2850 | } | |
2851 | ||
75f93fed PZ |
2852 | static __always_inline bool need_resched(void) |
2853 | { | |
2854 | return unlikely(tif_need_resched()); | |
2855 | } | |
2856 | ||
f06febc9 FM |
2857 | /* |
2858 | * Thread group CPU time accounting. | |
2859 | */ | |
4cd4c1b4 | 2860 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2861 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2862 | |
490dea45 | 2863 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2864 | { |
ee30a7b2 | 2865 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2866 | } |
2867 | ||
7bb44ade RM |
2868 | /* |
2869 | * Reevaluate whether the task has signals pending delivery. | |
2870 | * Wake the task if so. | |
2871 | * This is required every time the blocked sigset_t changes. | |
2872 | * callers must hold sighand->siglock. | |
2873 | */ | |
2874 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2875 | extern void recalc_sigpending(void); |
2876 | ||
910ffdb1 ON |
2877 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
2878 | ||
2879 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
2880 | { | |
2881 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
2882 | } | |
2883 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
2884 | { | |
2885 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
2886 | } | |
1da177e4 LT |
2887 | |
2888 | /* | |
2889 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2890 | */ | |
2891 | #ifdef CONFIG_SMP | |
2892 | ||
2893 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2894 | { | |
a1261f54 | 2895 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2896 | } |
2897 | ||
b32e86b4 IM |
2898 | static inline int task_node(const struct task_struct *p) |
2899 | { | |
2900 | return cpu_to_node(task_cpu(p)); | |
2901 | } | |
2902 | ||
c65cc870 | 2903 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2904 | |
2905 | #else | |
2906 | ||
2907 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2908 | { | |
2909 | return 0; | |
2910 | } | |
2911 | ||
2912 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2913 | { | |
2914 | } | |
2915 | ||
2916 | #endif /* CONFIG_SMP */ | |
2917 | ||
96f874e2 RR |
2918 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2919 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2920 | |
7c941438 | 2921 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 2922 | extern struct task_group root_task_group; |
8323f26c | 2923 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 2924 | |
54e99124 DG |
2925 | extern int task_can_switch_user(struct user_struct *up, |
2926 | struct task_struct *tsk); | |
2927 | ||
4b98d11b AD |
2928 | #ifdef CONFIG_TASK_XACCT |
2929 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2930 | { | |
940389b8 | 2931 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2932 | } |
2933 | ||
2934 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2935 | { | |
940389b8 | 2936 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2937 | } |
2938 | ||
2939 | static inline void inc_syscr(struct task_struct *tsk) | |
2940 | { | |
940389b8 | 2941 | tsk->ioac.syscr++; |
4b98d11b AD |
2942 | } |
2943 | ||
2944 | static inline void inc_syscw(struct task_struct *tsk) | |
2945 | { | |
940389b8 | 2946 | tsk->ioac.syscw++; |
4b98d11b AD |
2947 | } |
2948 | #else | |
2949 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2950 | { | |
2951 | } | |
2952 | ||
2953 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2954 | { | |
2955 | } | |
2956 | ||
2957 | static inline void inc_syscr(struct task_struct *tsk) | |
2958 | { | |
2959 | } | |
2960 | ||
2961 | static inline void inc_syscw(struct task_struct *tsk) | |
2962 | { | |
2963 | } | |
2964 | #endif | |
2965 | ||
82455257 DH |
2966 | #ifndef TASK_SIZE_OF |
2967 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2968 | #endif | |
2969 | ||
cf475ad2 BS |
2970 | #ifdef CONFIG_MM_OWNER |
2971 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2972 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2973 | #else | |
2974 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2975 | { | |
2976 | } | |
2977 | ||
2978 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2979 | { | |
2980 | } | |
2981 | #endif /* CONFIG_MM_OWNER */ | |
2982 | ||
3e10e716 JS |
2983 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2984 | unsigned int limit) | |
2985 | { | |
2986 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2987 | } | |
2988 | ||
2989 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2990 | unsigned int limit) | |
2991 | { | |
2992 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2993 | } | |
2994 | ||
2995 | static inline unsigned long rlimit(unsigned int limit) | |
2996 | { | |
2997 | return task_rlimit(current, limit); | |
2998 | } | |
2999 | ||
3000 | static inline unsigned long rlimit_max(unsigned int limit) | |
3001 | { | |
3002 | return task_rlimit_max(current, limit); | |
3003 | } | |
3004 | ||
1da177e4 | 3005 | #endif |