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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
b7b3c76a DW |
4 | /* |
5 | * cloning flags: | |
6 | */ | |
7 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
8 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
9 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
10 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
11 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
12 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
13 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
14 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
15 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
16 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
17 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
18 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
19 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
20 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
21 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
22 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
23 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
43bb40c9 DJ |
24 | /* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state) |
25 | and is now available for re-use. */ | |
071df104 | 26 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
25b21cb2 | 27 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
77ec739d | 28 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
30e49c26 | 29 | #define CLONE_NEWPID 0x20000000 /* New pid namespace */ |
169e3674 | 30 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
fadad878 | 31 | #define CLONE_IO 0x80000000 /* Clone io context */ |
b7b3c76a DW |
32 | |
33 | /* | |
34 | * Scheduling policies | |
35 | */ | |
36 | #define SCHED_NORMAL 0 | |
37 | #define SCHED_FIFO 1 | |
38 | #define SCHED_RR 2 | |
39 | #define SCHED_BATCH 3 | |
0e6aca43 IM |
40 | /* SCHED_ISO: reserved but not implemented yet */ |
41 | #define SCHED_IDLE 5 | |
ca94c442 LP |
42 | /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ |
43 | #define SCHED_RESET_ON_FORK 0x40000000 | |
b7b3c76a | 44 | |
a3b6714e | 45 | #ifdef __KERNEL__ |
b7b3c76a DW |
46 | |
47 | struct sched_param { | |
48 | int sched_priority; | |
49 | }; | |
50 | ||
1da177e4 LT |
51 | #include <asm/param.h> /* for HZ */ |
52 | ||
1da177e4 LT |
53 | #include <linux/capability.h> |
54 | #include <linux/threads.h> | |
55 | #include <linux/kernel.h> | |
56 | #include <linux/types.h> | |
57 | #include <linux/timex.h> | |
58 | #include <linux/jiffies.h> | |
59 | #include <linux/rbtree.h> | |
60 | #include <linux/thread_info.h> | |
61 | #include <linux/cpumask.h> | |
62 | #include <linux/errno.h> | |
63 | #include <linux/nodemask.h> | |
c92ff1bd | 64 | #include <linux/mm_types.h> |
1da177e4 LT |
65 | |
66 | #include <asm/system.h> | |
1da177e4 LT |
67 | #include <asm/page.h> |
68 | #include <asm/ptrace.h> | |
1da177e4 LT |
69 | #include <asm/cputime.h> |
70 | ||
71 | #include <linux/smp.h> | |
72 | #include <linux/sem.h> | |
73 | #include <linux/signal.h> | |
1da177e4 LT |
74 | #include <linux/compiler.h> |
75 | #include <linux/completion.h> | |
76 | #include <linux/pid.h> | |
77 | #include <linux/percpu.h> | |
78 | #include <linux/topology.h> | |
3e26c149 | 79 | #include <linux/proportions.h> |
1da177e4 | 80 | #include <linux/seccomp.h> |
e56d0903 | 81 | #include <linux/rcupdate.h> |
05725f7e | 82 | #include <linux/rculist.h> |
23f78d4a | 83 | #include <linux/rtmutex.h> |
1da177e4 | 84 | |
a3b6714e DW |
85 | #include <linux/time.h> |
86 | #include <linux/param.h> | |
87 | #include <linux/resource.h> | |
88 | #include <linux/timer.h> | |
89 | #include <linux/hrtimer.h> | |
7c3ab738 | 90 | #include <linux/task_io_accounting.h> |
9745512c | 91 | #include <linux/latencytop.h> |
9e2b2dc4 | 92 | #include <linux/cred.h> |
fa14ff4a | 93 | #include <linux/llist.h> |
a3b6714e DW |
94 | |
95 | #include <asm/processor.h> | |
36d57ac4 | 96 | |
1da177e4 | 97 | struct exec_domain; |
c87e2837 | 98 | struct futex_pi_state; |
286100a6 | 99 | struct robust_list_head; |
bddd87c7 | 100 | struct bio_list; |
5ad4e53b | 101 | struct fs_struct; |
cdd6c482 | 102 | struct perf_event_context; |
73c10101 | 103 | struct blk_plug; |
1da177e4 | 104 | |
1da177e4 LT |
105 | /* |
106 | * List of flags we want to share for kernel threads, | |
107 | * if only because they are not used by them anyway. | |
108 | */ | |
109 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
110 | ||
111 | /* | |
112 | * These are the constant used to fake the fixed-point load-average | |
113 | * counting. Some notes: | |
114 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
115 | * a load-average precision of 10 bits integer + 11 bits fractional | |
116 | * - if you want to count load-averages more often, you need more | |
117 | * precision, or rounding will get you. With 2-second counting freq, | |
118 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
119 | * 11 bit fractions. | |
120 | */ | |
121 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 122 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
123 | |
124 | #define FSHIFT 11 /* nr of bits of precision */ | |
125 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 126 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
127 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
128 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
129 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
130 | ||
131 | #define CALC_LOAD(load,exp,n) \ | |
132 | load *= exp; \ | |
133 | load += n*(FIXED_1-exp); \ | |
134 | load >>= FSHIFT; | |
135 | ||
136 | extern unsigned long total_forks; | |
137 | extern int nr_threads; | |
1da177e4 LT |
138 | DECLARE_PER_CPU(unsigned long, process_counts); |
139 | extern int nr_processes(void); | |
140 | extern unsigned long nr_running(void); | |
141 | extern unsigned long nr_uninterruptible(void); | |
142 | extern unsigned long nr_iowait(void); | |
8c215bd3 | 143 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
144 | extern unsigned long this_cpu_load(void); |
145 | ||
146 | ||
0f004f5a | 147 | extern void calc_global_load(unsigned long ticks); |
1da177e4 | 148 | |
7e49fcce SR |
149 | extern unsigned long get_parent_ip(unsigned long addr); |
150 | ||
43ae34cb IM |
151 | struct seq_file; |
152 | struct cfs_rq; | |
4cf86d77 | 153 | struct task_group; |
43ae34cb IM |
154 | #ifdef CONFIG_SCHED_DEBUG |
155 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
156 | extern void proc_sched_set_task(struct task_struct *p); | |
157 | extern void | |
5cef9eca | 158 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
159 | #else |
160 | static inline void | |
161 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
162 | { | |
163 | } | |
164 | static inline void proc_sched_set_task(struct task_struct *p) | |
165 | { | |
166 | } | |
167 | static inline void | |
5cef9eca | 168 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
169 | { |
170 | } | |
171 | #endif | |
1da177e4 | 172 | |
4a8342d2 LT |
173 | /* |
174 | * Task state bitmask. NOTE! These bits are also | |
175 | * encoded in fs/proc/array.c: get_task_state(). | |
176 | * | |
177 | * We have two separate sets of flags: task->state | |
178 | * is about runnability, while task->exit_state are | |
179 | * about the task exiting. Confusing, but this way | |
180 | * modifying one set can't modify the other one by | |
181 | * mistake. | |
182 | */ | |
1da177e4 LT |
183 | #define TASK_RUNNING 0 |
184 | #define TASK_INTERRUPTIBLE 1 | |
185 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
186 | #define __TASK_STOPPED 4 |
187 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
188 | /* in tsk->exit_state */ |
189 | #define EXIT_ZOMBIE 16 | |
190 | #define EXIT_DEAD 32 | |
191 | /* in tsk->state again */ | |
af927232 | 192 | #define TASK_DEAD 64 |
f021a3c2 | 193 | #define TASK_WAKEKILL 128 |
e9c84311 | 194 | #define TASK_WAKING 256 |
e1781538 | 195 | #define TASK_STATE_MAX 512 |
f021a3c2 | 196 | |
44d90df6 | 197 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" |
73342151 | 198 | |
e1781538 PZ |
199 | extern char ___assert_task_state[1 - 2*!!( |
200 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
201 | |
202 | /* Convenience macros for the sake of set_task_state */ | |
203 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
204 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
205 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 206 | |
92a1f4bc MW |
207 | /* Convenience macros for the sake of wake_up */ |
208 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 209 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
210 | |
211 | /* get_task_state() */ | |
212 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
213 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
214 | __TASK_TRACED) | |
92a1f4bc | 215 | |
f021a3c2 MW |
216 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
217 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
8f92054e | 218 | #define task_is_dead(task) ((task)->exit_state != 0) |
92a1f4bc | 219 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 220 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 221 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 222 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 223 | (task->flags & PF_FROZEN) == 0) |
1da177e4 LT |
224 | |
225 | #define __set_task_state(tsk, state_value) \ | |
226 | do { (tsk)->state = (state_value); } while (0) | |
227 | #define set_task_state(tsk, state_value) \ | |
228 | set_mb((tsk)->state, (state_value)) | |
229 | ||
498d0c57 AM |
230 | /* |
231 | * set_current_state() includes a barrier so that the write of current->state | |
232 | * is correctly serialised wrt the caller's subsequent test of whether to | |
233 | * actually sleep: | |
234 | * | |
235 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
236 | * if (do_i_need_to_sleep()) | |
237 | * schedule(); | |
238 | * | |
239 | * If the caller does not need such serialisation then use __set_current_state() | |
240 | */ | |
1da177e4 LT |
241 | #define __set_current_state(state_value) \ |
242 | do { current->state = (state_value); } while (0) | |
243 | #define set_current_state(state_value) \ | |
244 | set_mb(current->state, (state_value)) | |
245 | ||
246 | /* Task command name length */ | |
247 | #define TASK_COMM_LEN 16 | |
248 | ||
1da177e4 LT |
249 | #include <linux/spinlock.h> |
250 | ||
251 | /* | |
252 | * This serializes "schedule()" and also protects | |
253 | * the run-queue from deletions/modifications (but | |
254 | * _adding_ to the beginning of the run-queue has | |
255 | * a separate lock). | |
256 | */ | |
257 | extern rwlock_t tasklist_lock; | |
258 | extern spinlock_t mmlist_lock; | |
259 | ||
36c8b586 | 260 | struct task_struct; |
1da177e4 | 261 | |
db1466b3 PM |
262 | #ifdef CONFIG_PROVE_RCU |
263 | extern int lockdep_tasklist_lock_is_held(void); | |
264 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
265 | ||
1da177e4 LT |
266 | extern void sched_init(void); |
267 | extern void sched_init_smp(void); | |
2d07b255 | 268 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 269 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 270 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 271 | |
89f19f04 | 272 | extern int runqueue_is_locked(int cpu); |
017730c1 | 273 | |
46cb4b7c | 274 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
83cd4fe2 | 275 | extern void select_nohz_load_balancer(int stop_tick); |
69e1e811 | 276 | extern void set_cpu_sd_state_idle(void); |
83cd4fe2 | 277 | extern int get_nohz_timer_target(void); |
46cb4b7c | 278 | #else |
83cd4fe2 | 279 | static inline void select_nohz_load_balancer(int stop_tick) { } |
fdaabd80 | 280 | static inline void set_cpu_sd_state_idle(void) { } |
46cb4b7c | 281 | #endif |
1da177e4 | 282 | |
e59e2ae2 | 283 | /* |
39bc89fd | 284 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
285 | */ |
286 | extern void show_state_filter(unsigned long state_filter); | |
287 | ||
288 | static inline void show_state(void) | |
289 | { | |
39bc89fd | 290 | show_state_filter(0); |
e59e2ae2 IM |
291 | } |
292 | ||
1da177e4 LT |
293 | extern void show_regs(struct pt_regs *); |
294 | ||
295 | /* | |
296 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
297 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
298 | * trace (or NULL if the entire call-chain of the task should be shown). | |
299 | */ | |
300 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
301 | ||
302 | void io_schedule(void); | |
303 | long io_schedule_timeout(long timeout); | |
304 | ||
305 | extern void cpu_init (void); | |
306 | extern void trap_init(void); | |
307 | extern void update_process_times(int user); | |
308 | extern void scheduler_tick(void); | |
309 | ||
82a1fcb9 IM |
310 | extern void sched_show_task(struct task_struct *p); |
311 | ||
19cc36c0 | 312 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 313 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 314 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 315 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
316 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
317 | void __user *buffer, | |
318 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 319 | extern unsigned int softlockup_panic; |
004417a6 | 320 | void lockup_detector_init(void); |
8446f1d3 | 321 | #else |
8446f1d3 IM |
322 | static inline void touch_softlockup_watchdog(void) |
323 | { | |
324 | } | |
d6ad3e28 JW |
325 | static inline void touch_softlockup_watchdog_sync(void) |
326 | { | |
327 | } | |
04c9167f JF |
328 | static inline void touch_all_softlockup_watchdogs(void) |
329 | { | |
330 | } | |
004417a6 PZ |
331 | static inline void lockup_detector_init(void) |
332 | { | |
333 | } | |
8446f1d3 IM |
334 | #endif |
335 | ||
e162b39a MSB |
336 | #ifdef CONFIG_DETECT_HUNG_TASK |
337 | extern unsigned int sysctl_hung_task_panic; | |
338 | extern unsigned long sysctl_hung_task_check_count; | |
339 | extern unsigned long sysctl_hung_task_timeout_secs; | |
340 | extern unsigned long sysctl_hung_task_warnings; | |
341 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, | |
8d65af78 | 342 | void __user *buffer, |
e162b39a | 343 | size_t *lenp, loff_t *ppos); |
e4ecda1b ML |
344 | #else |
345 | /* Avoid need for ifdefs elsewhere in the code */ | |
346 | enum { sysctl_hung_task_timeout_secs = 0 }; | |
e162b39a | 347 | #endif |
8446f1d3 | 348 | |
1da177e4 LT |
349 | /* Attach to any functions which should be ignored in wchan output. */ |
350 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
351 | |
352 | /* Linker adds these: start and end of __sched functions */ | |
353 | extern char __sched_text_start[], __sched_text_end[]; | |
354 | ||
1da177e4 LT |
355 | /* Is this address in the __sched functions? */ |
356 | extern int in_sched_functions(unsigned long addr); | |
357 | ||
358 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 359 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 360 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 361 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 362 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 363 | asmlinkage void schedule(void); |
c5491ea7 | 364 | extern void schedule_preempt_disabled(void); |
c6eb3dda | 365 | extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner); |
1da177e4 | 366 | |
ab516013 | 367 | struct nsproxy; |
acce292c | 368 | struct user_namespace; |
1da177e4 | 369 | |
341c87bf KH |
370 | /* |
371 | * Default maximum number of active map areas, this limits the number of vmas | |
372 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
373 | * problem. | |
374 | * | |
375 | * When a program's coredump is generated as ELF format, a section is created | |
376 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
377 | * This means the number of sections should be smaller than 65535 at coredump. | |
378 | * Because the kernel adds some informative sections to a image of program at | |
379 | * generating coredump, we need some margin. The number of extra sections is | |
380 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
381 | */ | |
382 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
4be929be | 383 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
1da177e4 LT |
384 | |
385 | extern int sysctl_max_map_count; | |
386 | ||
387 | #include <linux/aio.h> | |
388 | ||
efc1a3b1 DH |
389 | #ifdef CONFIG_MMU |
390 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
391 | extern unsigned long |
392 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
393 | unsigned long, unsigned long); | |
394 | extern unsigned long | |
395 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
396 | unsigned long len, unsigned long pgoff, | |
397 | unsigned long flags); | |
1363c3cd WW |
398 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
399 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
efc1a3b1 DH |
400 | #else |
401 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
402 | #endif | |
1da177e4 | 403 | |
901608d9 | 404 | |
6c5d5238 KH |
405 | extern void set_dumpable(struct mm_struct *mm, int value); |
406 | extern int get_dumpable(struct mm_struct *mm); | |
407 | ||
408 | /* mm flags */ | |
3cb4a0bb | 409 | /* dumpable bits */ |
6c5d5238 KH |
410 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
411 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 412 | |
3cb4a0bb | 413 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 414 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
415 | |
416 | /* coredump filter bits */ | |
417 | #define MMF_DUMP_ANON_PRIVATE 2 | |
418 | #define MMF_DUMP_ANON_SHARED 3 | |
419 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
420 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 421 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
422 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
423 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 424 | |
3cb4a0bb | 425 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 426 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
427 | #define MMF_DUMP_FILTER_MASK \ |
428 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
429 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 430 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
431 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
432 | ||
433 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
434 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
435 | #else | |
436 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
437 | #endif | |
f8af4da3 HD |
438 | /* leave room for more dump flags */ |
439 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 440 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
f8af4da3 HD |
441 | |
442 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) | |
6c5d5238 | 443 | |
1da177e4 LT |
444 | struct sighand_struct { |
445 | atomic_t count; | |
446 | struct k_sigaction action[_NSIG]; | |
447 | spinlock_t siglock; | |
b8fceee1 | 448 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
449 | }; |
450 | ||
0e464814 | 451 | struct pacct_struct { |
f6ec29a4 KK |
452 | int ac_flag; |
453 | long ac_exitcode; | |
0e464814 | 454 | unsigned long ac_mem; |
77787bfb KK |
455 | cputime_t ac_utime, ac_stime; |
456 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
457 | }; |
458 | ||
42c4ab41 SG |
459 | struct cpu_itimer { |
460 | cputime_t expires; | |
461 | cputime_t incr; | |
8356b5f9 SG |
462 | u32 error; |
463 | u32 incr_error; | |
42c4ab41 SG |
464 | }; |
465 | ||
f06febc9 FM |
466 | /** |
467 | * struct task_cputime - collected CPU time counts | |
468 | * @utime: time spent in user mode, in &cputime_t units | |
469 | * @stime: time spent in kernel mode, in &cputime_t units | |
470 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 471 | * |
f06febc9 FM |
472 | * This structure groups together three kinds of CPU time that are |
473 | * tracked for threads and thread groups. Most things considering | |
474 | * CPU time want to group these counts together and treat all three | |
475 | * of them in parallel. | |
476 | */ | |
477 | struct task_cputime { | |
478 | cputime_t utime; | |
479 | cputime_t stime; | |
480 | unsigned long long sum_exec_runtime; | |
481 | }; | |
482 | /* Alternate field names when used to cache expirations. */ | |
483 | #define prof_exp stime | |
484 | #define virt_exp utime | |
485 | #define sched_exp sum_exec_runtime | |
486 | ||
4cd4c1b4 PZ |
487 | #define INIT_CPUTIME \ |
488 | (struct task_cputime) { \ | |
64861634 MS |
489 | .utime = 0, \ |
490 | .stime = 0, \ | |
4cd4c1b4 PZ |
491 | .sum_exec_runtime = 0, \ |
492 | } | |
493 | ||
c99e6efe PZ |
494 | /* |
495 | * Disable preemption until the scheduler is running. | |
496 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
497 | * |
498 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
499 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 500 | */ |
d86ee480 | 501 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 502 | |
f06febc9 | 503 | /** |
4cd4c1b4 PZ |
504 | * struct thread_group_cputimer - thread group interval timer counts |
505 | * @cputime: thread group interval timers. | |
506 | * @running: non-zero when there are timers running and | |
507 | * @cputime receives updates. | |
508 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
509 | * |
510 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 511 | * used for thread group CPU timer calculations. |
f06febc9 | 512 | */ |
4cd4c1b4 PZ |
513 | struct thread_group_cputimer { |
514 | struct task_cputime cputime; | |
515 | int running; | |
ee30a7b2 | 516 | raw_spinlock_t lock; |
f06febc9 | 517 | }; |
f06febc9 | 518 | |
4714d1d3 | 519 | #include <linux/rwsem.h> |
5091faa4 MG |
520 | struct autogroup; |
521 | ||
1da177e4 | 522 | /* |
e815f0a8 | 523 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
524 | * locking, because a shared signal_struct always |
525 | * implies a shared sighand_struct, so locking | |
526 | * sighand_struct is always a proper superset of | |
527 | * the locking of signal_struct. | |
528 | */ | |
529 | struct signal_struct { | |
ea6d290c | 530 | atomic_t sigcnt; |
1da177e4 | 531 | atomic_t live; |
b3ac022c | 532 | int nr_threads; |
1da177e4 LT |
533 | |
534 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
535 | ||
536 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 537 | struct task_struct *curr_target; |
1da177e4 LT |
538 | |
539 | /* shared signal handling: */ | |
540 | struct sigpending shared_pending; | |
541 | ||
542 | /* thread group exit support */ | |
543 | int group_exit_code; | |
544 | /* overloaded: | |
545 | * - notify group_exit_task when ->count is equal to notify_count | |
546 | * - everyone except group_exit_task is stopped during signal delivery | |
547 | * of fatal signals, group_exit_task processes the signal. | |
548 | */ | |
1da177e4 | 549 | int notify_count; |
07dd20e0 | 550 | struct task_struct *group_exit_task; |
1da177e4 LT |
551 | |
552 | /* thread group stop support, overloads group_exit_code too */ | |
553 | int group_stop_count; | |
554 | unsigned int flags; /* see SIGNAL_* flags below */ | |
555 | ||
ebec18a6 LP |
556 | /* |
557 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
558 | * manager, to re-parent orphan (double-forking) child processes | |
559 | * to this process instead of 'init'. The service manager is | |
560 | * able to receive SIGCHLD signals and is able to investigate | |
561 | * the process until it calls wait(). All children of this | |
562 | * process will inherit a flag if they should look for a | |
563 | * child_subreaper process at exit. | |
564 | */ | |
565 | unsigned int is_child_subreaper:1; | |
566 | unsigned int has_child_subreaper:1; | |
567 | ||
1da177e4 LT |
568 | /* POSIX.1b Interval Timers */ |
569 | struct list_head posix_timers; | |
570 | ||
571 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 572 | struct hrtimer real_timer; |
fea9d175 | 573 | struct pid *leader_pid; |
2ff678b8 | 574 | ktime_t it_real_incr; |
1da177e4 | 575 | |
42c4ab41 SG |
576 | /* |
577 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
578 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
579 | * values are defined to 0 and 1 respectively | |
580 | */ | |
581 | struct cpu_itimer it[2]; | |
1da177e4 | 582 | |
f06febc9 | 583 | /* |
4cd4c1b4 PZ |
584 | * Thread group totals for process CPU timers. |
585 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 586 | */ |
4cd4c1b4 | 587 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
588 | |
589 | /* Earliest-expiration cache. */ | |
590 | struct task_cputime cputime_expires; | |
591 | ||
592 | struct list_head cpu_timers[3]; | |
593 | ||
ab521dc0 | 594 | struct pid *tty_old_pgrp; |
1ec320af | 595 | |
1da177e4 LT |
596 | /* boolean value for session group leader */ |
597 | int leader; | |
598 | ||
599 | struct tty_struct *tty; /* NULL if no tty */ | |
600 | ||
5091faa4 MG |
601 | #ifdef CONFIG_SCHED_AUTOGROUP |
602 | struct autogroup *autogroup; | |
603 | #endif | |
1da177e4 LT |
604 | /* |
605 | * Cumulative resource counters for dead threads in the group, | |
606 | * and for reaped dead child processes forked by this group. | |
607 | * Live threads maintain their own counters and add to these | |
608 | * in __exit_signal, except for the group leader. | |
609 | */ | |
32bd671d | 610 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
611 | cputime_t gtime; |
612 | cputime_t cgtime; | |
0cf55e1e HS |
613 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
614 | cputime_t prev_utime, prev_stime; | |
615 | #endif | |
1da177e4 LT |
616 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
617 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 618 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 619 | unsigned long maxrss, cmaxrss; |
940389b8 | 620 | struct task_io_accounting ioac; |
1da177e4 | 621 | |
32bd671d PZ |
622 | /* |
623 | * Cumulative ns of schedule CPU time fo dead threads in the | |
624 | * group, not including a zombie group leader, (This only differs | |
625 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
626 | * other than jiffies.) | |
627 | */ | |
628 | unsigned long long sum_sched_runtime; | |
629 | ||
1da177e4 LT |
630 | /* |
631 | * We don't bother to synchronize most readers of this at all, | |
632 | * because there is no reader checking a limit that actually needs | |
633 | * to get both rlim_cur and rlim_max atomically, and either one | |
634 | * alone is a single word that can safely be read normally. | |
635 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
636 | * protect this instead of the siglock, because they really | |
637 | * have no need to disable irqs. | |
638 | */ | |
639 | struct rlimit rlim[RLIM_NLIMITS]; | |
640 | ||
0e464814 KK |
641 | #ifdef CONFIG_BSD_PROCESS_ACCT |
642 | struct pacct_struct pacct; /* per-process accounting information */ | |
643 | #endif | |
ad4ecbcb | 644 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
645 | struct taskstats *stats; |
646 | #endif | |
522ed776 MT |
647 | #ifdef CONFIG_AUDIT |
648 | unsigned audit_tty; | |
649 | struct tty_audit_buf *tty_audit_buf; | |
650 | #endif | |
4714d1d3 BB |
651 | #ifdef CONFIG_CGROUPS |
652 | /* | |
77e4ef99 TH |
653 | * group_rwsem prevents new tasks from entering the threadgroup and |
654 | * member tasks from exiting,a more specifically, setting of | |
655 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
656 | * using threadgroup_change_begin/end(). Users which require | |
657 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
658 | * which also takes care of exec path. Currently, cgroup is the | |
659 | * only user. | |
4714d1d3 | 660 | */ |
257058ae | 661 | struct rw_semaphore group_rwsem; |
4714d1d3 | 662 | #endif |
28b83c51 | 663 | |
a63d83f4 DR |
664 | int oom_adj; /* OOM kill score adjustment (bit shift) */ |
665 | int oom_score_adj; /* OOM kill score adjustment */ | |
dabb16f6 MSB |
666 | int oom_score_adj_min; /* OOM kill score adjustment minimum value. |
667 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
668 | |
669 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
670 | * credential calculations | |
671 | * (notably. ptrace) */ | |
1da177e4 LT |
672 | }; |
673 | ||
4866cde0 NP |
674 | /* Context switch must be unlocked if interrupts are to be enabled */ |
675 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
676 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
677 | #endif | |
678 | ||
1da177e4 LT |
679 | /* |
680 | * Bits in flags field of signal_struct. | |
681 | */ | |
682 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
683 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
684 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
e4420551 ON |
685 | /* |
686 | * Pending notifications to parent. | |
687 | */ | |
688 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
689 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
690 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 691 | |
fae5fa44 ON |
692 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
693 | ||
ed5d2cac ON |
694 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
695 | static inline int signal_group_exit(const struct signal_struct *sig) | |
696 | { | |
697 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
698 | (sig->group_exit_task != NULL); | |
699 | } | |
700 | ||
1da177e4 LT |
701 | /* |
702 | * Some day this will be a full-fledged user tracking system.. | |
703 | */ | |
704 | struct user_struct { | |
705 | atomic_t __count; /* reference count */ | |
706 | atomic_t processes; /* How many processes does this user have? */ | |
707 | atomic_t files; /* How many open files does this user have? */ | |
708 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 709 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
710 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
711 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
712 | #endif | |
4afeff85 EP |
713 | #ifdef CONFIG_FANOTIFY |
714 | atomic_t fanotify_listeners; | |
715 | #endif | |
7ef9964e | 716 | #ifdef CONFIG_EPOLL |
52bd19f7 | 717 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 718 | #endif |
970a8645 | 719 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
720 | /* protected by mq_lock */ |
721 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 722 | #endif |
1da177e4 LT |
723 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
724 | ||
725 | #ifdef CONFIG_KEYS | |
726 | struct key *uid_keyring; /* UID specific keyring */ | |
727 | struct key *session_keyring; /* UID's default session keyring */ | |
728 | #endif | |
729 | ||
730 | /* Hash table maintenance information */ | |
735de223 | 731 | struct hlist_node uidhash_node; |
1da177e4 | 732 | uid_t uid; |
18b6e041 | 733 | struct user_namespace *user_ns; |
24e377a8 | 734 | |
cdd6c482 | 735 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
736 | atomic_long_t locked_vm; |
737 | #endif | |
1da177e4 LT |
738 | }; |
739 | ||
eb41d946 | 740 | extern int uids_sysfs_init(void); |
5cb350ba | 741 | |
1da177e4 LT |
742 | extern struct user_struct *find_user(uid_t); |
743 | ||
744 | extern struct user_struct root_user; | |
745 | #define INIT_USER (&root_user) | |
746 | ||
b6dff3ec | 747 | |
1da177e4 LT |
748 | struct backing_dev_info; |
749 | struct reclaim_state; | |
750 | ||
52f17b6c | 751 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
752 | struct sched_info { |
753 | /* cumulative counters */ | |
2d72376b | 754 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 755 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
756 | |
757 | /* timestamps */ | |
172ba844 BS |
758 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
759 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 760 | }; |
52f17b6c | 761 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 762 | |
ca74e92b SN |
763 | #ifdef CONFIG_TASK_DELAY_ACCT |
764 | struct task_delay_info { | |
765 | spinlock_t lock; | |
766 | unsigned int flags; /* Private per-task flags */ | |
767 | ||
768 | /* For each stat XXX, add following, aligned appropriately | |
769 | * | |
770 | * struct timespec XXX_start, XXX_end; | |
771 | * u64 XXX_delay; | |
772 | * u32 XXX_count; | |
773 | * | |
774 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
775 | * single lock above (split into XXX_lock if contention is an issue). | |
776 | */ | |
0ff92245 SN |
777 | |
778 | /* | |
779 | * XXX_count is incremented on every XXX operation, the delay | |
780 | * associated with the operation is added to XXX_delay. | |
781 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
782 | */ | |
783 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
784 | u64 blkio_delay; /* wait for sync block io completion */ | |
785 | u64 swapin_delay; /* wait for swapin block io completion */ | |
786 | u32 blkio_count; /* total count of the number of sync block */ | |
787 | /* io operations performed */ | |
788 | u32 swapin_count; /* total count of the number of swapin block */ | |
789 | /* io operations performed */ | |
873b4771 KK |
790 | |
791 | struct timespec freepages_start, freepages_end; | |
792 | u64 freepages_delay; /* wait for memory reclaim */ | |
793 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 794 | }; |
52f17b6c CS |
795 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
796 | ||
797 | static inline int sched_info_on(void) | |
798 | { | |
799 | #ifdef CONFIG_SCHEDSTATS | |
800 | return 1; | |
801 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
802 | extern int delayacct_on; | |
803 | return delayacct_on; | |
804 | #else | |
805 | return 0; | |
ca74e92b | 806 | #endif |
52f17b6c | 807 | } |
ca74e92b | 808 | |
d15bcfdb IM |
809 | enum cpu_idle_type { |
810 | CPU_IDLE, | |
811 | CPU_NOT_IDLE, | |
812 | CPU_NEWLY_IDLE, | |
813 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
814 | }; |
815 | ||
816 | /* | |
c8b28116 NR |
817 | * Increase resolution of nice-level calculations for 64-bit architectures. |
818 | * The extra resolution improves shares distribution and load balancing of | |
819 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup | |
820 | * hierarchies, especially on larger systems. This is not a user-visible change | |
821 | * and does not change the user-interface for setting shares/weights. | |
822 | * | |
823 | * We increase resolution only if we have enough bits to allow this increased | |
824 | * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution | |
825 | * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the | |
826 | * increased costs. | |
1da177e4 | 827 | */ |
e4c2fb0d | 828 | #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */ |
c8b28116 NR |
829 | # define SCHED_LOAD_RESOLUTION 10 |
830 | # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) | |
831 | # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) | |
832 | #else | |
833 | # define SCHED_LOAD_RESOLUTION 0 | |
834 | # define scale_load(w) (w) | |
835 | # define scale_load_down(w) (w) | |
836 | #endif | |
9aa7b369 | 837 | |
c8b28116 | 838 | #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) |
9aa7b369 IM |
839 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
840 | ||
1399fa78 NR |
841 | /* |
842 | * Increase resolution of cpu_power calculations | |
843 | */ | |
844 | #define SCHED_POWER_SHIFT 10 | |
845 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) | |
1da177e4 | 846 | |
1399fa78 NR |
847 | /* |
848 | * sched-domains (multiprocessor balancing) declarations: | |
849 | */ | |
2dd73a4f | 850 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
851 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
852 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
853 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
854 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 855 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 856 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
59abf026 | 857 | #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ |
b5d978e0 PZ |
858 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
859 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ | |
860 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ | |
861 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 862 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 863 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 864 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
5c45bf27 | 865 | |
afb8a9b7 GS |
866 | enum powersavings_balance_level { |
867 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ | |
868 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package | |
869 | * first for long running threads | |
870 | */ | |
871 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle | |
872 | * cpu package for power savings | |
873 | */ | |
874 | MAX_POWERSAVINGS_BALANCE_LEVELS | |
875 | }; | |
89c4710e | 876 | |
716707b2 | 877 | extern int sched_mc_power_savings, sched_smt_power_savings; |
89c4710e | 878 | |
716707b2 VS |
879 | static inline int sd_balance_for_mc_power(void) |
880 | { | |
881 | if (sched_smt_power_savings) | |
882 | return SD_POWERSAVINGS_BALANCE; | |
5c45bf27 | 883 | |
28f53181 VS |
884 | if (!sched_mc_power_savings) |
885 | return SD_PREFER_SIBLING; | |
886 | ||
887 | return 0; | |
716707b2 | 888 | } |
89c4710e | 889 | |
716707b2 VS |
890 | static inline int sd_balance_for_package_power(void) |
891 | { | |
892 | if (sched_mc_power_savings | sched_smt_power_savings) | |
893 | return SD_POWERSAVINGS_BALANCE; | |
894 | ||
b5d978e0 | 895 | return SD_PREFER_SIBLING; |
716707b2 | 896 | } |
5c45bf27 | 897 | |
532cb4c4 MN |
898 | extern int __weak arch_sd_sibiling_asym_packing(void); |
899 | ||
100fdaee VS |
900 | /* |
901 | * Optimise SD flags for power savings: | |
25985edc | 902 | * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings. |
100fdaee VS |
903 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 |
904 | */ | |
905 | ||
906 | static inline int sd_power_saving_flags(void) | |
907 | { | |
908 | if (sched_mc_power_savings | sched_smt_power_savings) | |
909 | return SD_BALANCE_NEWIDLE; | |
910 | ||
911 | return 0; | |
912 | } | |
1da177e4 | 913 | |
9c3f75cb | 914 | struct sched_group_power { |
e3589f6c | 915 | atomic_t ref; |
1da177e4 LT |
916 | /* |
917 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
18a3885f | 918 | * single CPU. |
5517d86b | 919 | */ |
9c3f75cb | 920 | unsigned int power, power_orig; |
4ec4412e | 921 | unsigned long next_update; |
69e1e811 SS |
922 | /* |
923 | * Number of busy cpus in this group. | |
924 | */ | |
925 | atomic_t nr_busy_cpus; | |
9c3f75cb PZ |
926 | }; |
927 | ||
928 | struct sched_group { | |
929 | struct sched_group *next; /* Must be a circular list */ | |
930 | atomic_t ref; | |
931 | ||
aae6d3dd | 932 | unsigned int group_weight; |
9c3f75cb | 933 | struct sched_group_power *sgp; |
6c99e9ad | 934 | |
4200efd9 IM |
935 | /* |
936 | * The CPUs this group covers. | |
937 | * | |
938 | * NOTE: this field is variable length. (Allocated dynamically | |
939 | * by attaching extra space to the end of the structure, | |
940 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
941 | */ |
942 | unsigned long cpumask[0]; | |
1da177e4 LT |
943 | }; |
944 | ||
758b2cdc RR |
945 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
946 | { | |
6c99e9ad | 947 | return to_cpumask(sg->cpumask); |
758b2cdc RR |
948 | } |
949 | ||
029632fb PZ |
950 | /** |
951 | * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. | |
952 | * @group: The group whose first cpu is to be returned. | |
953 | */ | |
954 | static inline unsigned int group_first_cpu(struct sched_group *group) | |
955 | { | |
956 | return cpumask_first(sched_group_cpus(group)); | |
957 | } | |
958 | ||
1d3504fc HS |
959 | struct sched_domain_attr { |
960 | int relax_domain_level; | |
961 | }; | |
962 | ||
963 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
964 | .relax_domain_level = -1, \ | |
965 | } | |
966 | ||
60495e77 PZ |
967 | extern int sched_domain_level_max; |
968 | ||
1da177e4 LT |
969 | struct sched_domain { |
970 | /* These fields must be setup */ | |
971 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 972 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 973 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
974 | unsigned long min_interval; /* Minimum balance interval ms */ |
975 | unsigned long max_interval; /* Maximum balance interval ms */ | |
976 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
977 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 978 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
979 | unsigned int busy_idx; |
980 | unsigned int idle_idx; | |
981 | unsigned int newidle_idx; | |
982 | unsigned int wake_idx; | |
147cbb4b | 983 | unsigned int forkexec_idx; |
a52bfd73 | 984 | unsigned int smt_gain; |
1da177e4 | 985 | int flags; /* See SD_* */ |
60495e77 | 986 | int level; |
1da177e4 LT |
987 | |
988 | /* Runtime fields. */ | |
989 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
990 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
991 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
992 | ||
2398f2c6 PZ |
993 | u64 last_update; |
994 | ||
1da177e4 LT |
995 | #ifdef CONFIG_SCHEDSTATS |
996 | /* load_balance() stats */ | |
480b9434 KC |
997 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
998 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
999 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
1000 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
1001 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
1002 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
1003 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
1004 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
1005 | |
1006 | /* Active load balancing */ | |
480b9434 KC |
1007 | unsigned int alb_count; |
1008 | unsigned int alb_failed; | |
1009 | unsigned int alb_pushed; | |
1da177e4 | 1010 | |
68767a0a | 1011 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
1012 | unsigned int sbe_count; |
1013 | unsigned int sbe_balanced; | |
1014 | unsigned int sbe_pushed; | |
1da177e4 | 1015 | |
68767a0a | 1016 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
1017 | unsigned int sbf_count; |
1018 | unsigned int sbf_balanced; | |
1019 | unsigned int sbf_pushed; | |
68767a0a | 1020 | |
1da177e4 | 1021 | /* try_to_wake_up() stats */ |
480b9434 KC |
1022 | unsigned int ttwu_wake_remote; |
1023 | unsigned int ttwu_move_affine; | |
1024 | unsigned int ttwu_move_balance; | |
1da177e4 | 1025 | #endif |
a5d8c348 IM |
1026 | #ifdef CONFIG_SCHED_DEBUG |
1027 | char *name; | |
1028 | #endif | |
dce840a0 PZ |
1029 | union { |
1030 | void *private; /* used during construction */ | |
1031 | struct rcu_head rcu; /* used during destruction */ | |
1032 | }; | |
6c99e9ad | 1033 | |
669c55e9 | 1034 | unsigned int span_weight; |
4200efd9 IM |
1035 | /* |
1036 | * Span of all CPUs in this domain. | |
1037 | * | |
1038 | * NOTE: this field is variable length. (Allocated dynamically | |
1039 | * by attaching extra space to the end of the structure, | |
1040 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
1041 | */ |
1042 | unsigned long span[0]; | |
1da177e4 LT |
1043 | }; |
1044 | ||
758b2cdc RR |
1045 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
1046 | { | |
6c99e9ad | 1047 | return to_cpumask(sd->span); |
758b2cdc RR |
1048 | } |
1049 | ||
acc3f5d7 | 1050 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 1051 | struct sched_domain_attr *dattr_new); |
029190c5 | 1052 | |
acc3f5d7 RR |
1053 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
1054 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1055 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1056 | ||
06aaf76a IM |
1057 | /* Test a flag in parent sched domain */ |
1058 | static inline int test_sd_parent(struct sched_domain *sd, int flag) | |
1059 | { | |
1060 | if (sd->parent && (sd->parent->flags & flag)) | |
1061 | return 1; | |
1062 | ||
1063 | return 0; | |
1064 | } | |
029190c5 | 1065 | |
47fe38fc PZ |
1066 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
1067 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); | |
1068 | ||
39be3501 PZ |
1069 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1070 | ||
1b427c15 | 1071 | #else /* CONFIG_SMP */ |
1da177e4 | 1072 | |
1b427c15 | 1073 | struct sched_domain_attr; |
d02c7a8c | 1074 | |
1b427c15 | 1075 | static inline void |
acc3f5d7 | 1076 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1077 | struct sched_domain_attr *dattr_new) |
1078 | { | |
d02c7a8c | 1079 | } |
39be3501 PZ |
1080 | |
1081 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1082 | { | |
1083 | return true; | |
1084 | } | |
1085 | ||
1b427c15 | 1086 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1087 | |
47fe38fc | 1088 | |
1da177e4 | 1089 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1090 | |
1da177e4 | 1091 | |
383f2835 | 1092 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1093 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
1094 | #else |
1095 | static inline void prefetch_stack(struct task_struct *t) { } | |
1096 | #endif | |
1da177e4 LT |
1097 | |
1098 | struct audit_context; /* See audit.c */ | |
1099 | struct mempolicy; | |
b92ce558 | 1100 | struct pipe_inode_info; |
4865ecf1 | 1101 | struct uts_namespace; |
1da177e4 | 1102 | |
20b8a59f IM |
1103 | struct rq; |
1104 | struct sched_domain; | |
1105 | ||
7d478721 PZ |
1106 | /* |
1107 | * wake flags | |
1108 | */ | |
1109 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ | |
a7558e01 | 1110 | #define WF_FORK 0x02 /* child wakeup after fork */ |
f339b9dc | 1111 | #define WF_MIGRATED 0x04 /* internal use, task got migrated */ |
7d478721 | 1112 | |
371fd7e7 | 1113 | #define ENQUEUE_WAKEUP 1 |
74f8e4b2 PZ |
1114 | #define ENQUEUE_HEAD 2 |
1115 | #ifdef CONFIG_SMP | |
1116 | #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */ | |
1117 | #else | |
1118 | #define ENQUEUE_WAKING 0 | |
1119 | #endif | |
371fd7e7 PZ |
1120 | |
1121 | #define DEQUEUE_SLEEP 1 | |
1122 | ||
20b8a59f | 1123 | struct sched_class { |
5522d5d5 | 1124 | const struct sched_class *next; |
20b8a59f | 1125 | |
371fd7e7 PZ |
1126 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
1127 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
4530d7ab | 1128 | void (*yield_task) (struct rq *rq); |
d95f4122 | 1129 | bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); |
20b8a59f | 1130 | |
7d478721 | 1131 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
20b8a59f | 1132 | |
fb8d4724 | 1133 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 1134 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 1135 | |
681f3e68 | 1136 | #ifdef CONFIG_SMP |
7608dec2 | 1137 | int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); |
4ce72a2c | 1138 | |
9a897c5a SR |
1139 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1140 | void (*post_schedule) (struct rq *this_rq); | |
74f8e4b2 | 1141 | void (*task_waking) (struct task_struct *task); |
efbbd05a | 1142 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); |
e1d1484f | 1143 | |
cd8ba7cd | 1144 | void (*set_cpus_allowed)(struct task_struct *p, |
96f874e2 | 1145 | const struct cpumask *newmask); |
57d885fe | 1146 | |
1f11eb6a GH |
1147 | void (*rq_online)(struct rq *rq); |
1148 | void (*rq_offline)(struct rq *rq); | |
4ce72a2c LZ |
1149 | #endif |
1150 | ||
1151 | void (*set_curr_task) (struct rq *rq); | |
1152 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
cd29fe6f | 1153 | void (*task_fork) (struct task_struct *p); |
cb469845 | 1154 | |
da7a735e PZ |
1155 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
1156 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
cb469845 | 1157 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
da7a735e | 1158 | int oldprio); |
810b3817 | 1159 | |
dba091b9 TG |
1160 | unsigned int (*get_rr_interval) (struct rq *rq, |
1161 | struct task_struct *task); | |
0d721cea | 1162 | |
810b3817 | 1163 | #ifdef CONFIG_FAIR_GROUP_SCHED |
b2b5ce02 | 1164 | void (*task_move_group) (struct task_struct *p, int on_rq); |
810b3817 | 1165 | #endif |
20b8a59f IM |
1166 | }; |
1167 | ||
1168 | struct load_weight { | |
1169 | unsigned long weight, inv_weight; | |
1170 | }; | |
1171 | ||
94c18227 | 1172 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1173 | struct sched_statistics { |
20b8a59f | 1174 | u64 wait_start; |
94c18227 | 1175 | u64 wait_max; |
6d082592 AV |
1176 | u64 wait_count; |
1177 | u64 wait_sum; | |
8f0dfc34 AV |
1178 | u64 iowait_count; |
1179 | u64 iowait_sum; | |
94c18227 | 1180 | |
20b8a59f | 1181 | u64 sleep_start; |
20b8a59f | 1182 | u64 sleep_max; |
94c18227 IM |
1183 | s64 sum_sleep_runtime; |
1184 | ||
1185 | u64 block_start; | |
20b8a59f IM |
1186 | u64 block_max; |
1187 | u64 exec_max; | |
eba1ed4b | 1188 | u64 slice_max; |
cc367732 | 1189 | |
cc367732 IM |
1190 | u64 nr_migrations_cold; |
1191 | u64 nr_failed_migrations_affine; | |
1192 | u64 nr_failed_migrations_running; | |
1193 | u64 nr_failed_migrations_hot; | |
1194 | u64 nr_forced_migrations; | |
cc367732 IM |
1195 | |
1196 | u64 nr_wakeups; | |
1197 | u64 nr_wakeups_sync; | |
1198 | u64 nr_wakeups_migrate; | |
1199 | u64 nr_wakeups_local; | |
1200 | u64 nr_wakeups_remote; | |
1201 | u64 nr_wakeups_affine; | |
1202 | u64 nr_wakeups_affine_attempts; | |
1203 | u64 nr_wakeups_passive; | |
1204 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1205 | }; |
1206 | #endif | |
1207 | ||
1208 | struct sched_entity { | |
1209 | struct load_weight load; /* for load-balancing */ | |
1210 | struct rb_node run_node; | |
1211 | struct list_head group_node; | |
1212 | unsigned int on_rq; | |
1213 | ||
1214 | u64 exec_start; | |
1215 | u64 sum_exec_runtime; | |
1216 | u64 vruntime; | |
1217 | u64 prev_sum_exec_runtime; | |
1218 | ||
41acab88 LDM |
1219 | u64 nr_migrations; |
1220 | ||
41acab88 LDM |
1221 | #ifdef CONFIG_SCHEDSTATS |
1222 | struct sched_statistics statistics; | |
94c18227 IM |
1223 | #endif |
1224 | ||
20b8a59f IM |
1225 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1226 | struct sched_entity *parent; | |
1227 | /* rq on which this entity is (to be) queued: */ | |
1228 | struct cfs_rq *cfs_rq; | |
1229 | /* rq "owned" by this entity/group: */ | |
1230 | struct cfs_rq *my_q; | |
1231 | #endif | |
1232 | }; | |
70b97a7f | 1233 | |
fa717060 PZ |
1234 | struct sched_rt_entity { |
1235 | struct list_head run_list; | |
78f2c7db | 1236 | unsigned long timeout; |
bee367ed | 1237 | unsigned int time_slice; |
6f505b16 PZ |
1238 | int nr_cpus_allowed; |
1239 | ||
58d6c2d7 | 1240 | struct sched_rt_entity *back; |
052f1dc7 | 1241 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1242 | struct sched_rt_entity *parent; |
1243 | /* rq on which this entity is (to be) queued: */ | |
1244 | struct rt_rq *rt_rq; | |
1245 | /* rq "owned" by this entity/group: */ | |
1246 | struct rt_rq *my_q; | |
1247 | #endif | |
fa717060 PZ |
1248 | }; |
1249 | ||
de5bdff7 HS |
1250 | /* |
1251 | * default timeslice is 100 msecs (used only for SCHED_RR tasks). | |
1252 | * Timeslices get refilled after they expire. | |
1253 | */ | |
1254 | #define RR_TIMESLICE (100 * HZ / 1000) | |
1255 | ||
86848966 PM |
1256 | struct rcu_node; |
1257 | ||
8dc85d54 PZ |
1258 | enum perf_event_task_context { |
1259 | perf_invalid_context = -1, | |
1260 | perf_hw_context = 0, | |
89a1e187 | 1261 | perf_sw_context, |
8dc85d54 PZ |
1262 | perf_nr_task_contexts, |
1263 | }; | |
1264 | ||
1da177e4 LT |
1265 | struct task_struct { |
1266 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1267 | void *stack; |
1da177e4 | 1268 | atomic_t usage; |
97dc32cd WC |
1269 | unsigned int flags; /* per process flags, defined below */ |
1270 | unsigned int ptrace; | |
1da177e4 | 1271 | |
2dd73a4f | 1272 | #ifdef CONFIG_SMP |
fa14ff4a | 1273 | struct llist_node wake_entry; |
3ca7a440 | 1274 | int on_cpu; |
2dd73a4f | 1275 | #endif |
fd2f4419 | 1276 | int on_rq; |
50e645a8 | 1277 | |
b29739f9 | 1278 | int prio, static_prio, normal_prio; |
c7aceaba | 1279 | unsigned int rt_priority; |
5522d5d5 | 1280 | const struct sched_class *sched_class; |
20b8a59f | 1281 | struct sched_entity se; |
fa717060 | 1282 | struct sched_rt_entity rt; |
1da177e4 | 1283 | |
e107be36 AK |
1284 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1285 | /* list of struct preempt_notifier: */ | |
1286 | struct hlist_head preempt_notifiers; | |
1287 | #endif | |
1288 | ||
18796aa0 AD |
1289 | /* |
1290 | * fpu_counter contains the number of consecutive context switches | |
1291 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1292 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1293 | * so that after 256 times the counter wraps and the behavior turns | |
1294 | * lazy again; this to deal with bursty apps that only use FPU for | |
1295 | * a short time | |
1296 | */ | |
1297 | unsigned char fpu_counter; | |
6c5c9341 | 1298 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1299 | unsigned int btrace_seq; |
6c5c9341 | 1300 | #endif |
1da177e4 | 1301 | |
97dc32cd | 1302 | unsigned int policy; |
1da177e4 | 1303 | cpumask_t cpus_allowed; |
1da177e4 | 1304 | |
a57eb940 | 1305 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1306 | int rcu_read_lock_nesting; |
f41d911f | 1307 | char rcu_read_unlock_special; |
f41d911f | 1308 | struct list_head rcu_node_entry; |
a57eb940 PM |
1309 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1310 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1311 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1312 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1313 | #ifdef CONFIG_RCU_BOOST |
1314 | struct rt_mutex *rcu_boost_mutex; | |
1315 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1316 | |
52f17b6c | 1317 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1318 | struct sched_info sched_info; |
1319 | #endif | |
1320 | ||
1321 | struct list_head tasks; | |
806c09a7 | 1322 | #ifdef CONFIG_SMP |
917b627d | 1323 | struct plist_node pushable_tasks; |
806c09a7 | 1324 | #endif |
1da177e4 LT |
1325 | |
1326 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1327 | #ifdef CONFIG_COMPAT_BRK |
1328 | unsigned brk_randomized:1; | |
1329 | #endif | |
34e55232 KH |
1330 | #if defined(SPLIT_RSS_COUNTING) |
1331 | struct task_rss_stat rss_stat; | |
1332 | #endif | |
1da177e4 | 1333 | /* task state */ |
97dc32cd | 1334 | int exit_state; |
1da177e4 LT |
1335 | int exit_code, exit_signal; |
1336 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1337 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
1da177e4 | 1338 | /* ??? */ |
97dc32cd | 1339 | unsigned int personality; |
1da177e4 | 1340 | unsigned did_exec:1; |
f9ce1f1c KT |
1341 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1342 | * execve */ | |
8f0dfc34 AV |
1343 | unsigned in_iowait:1; |
1344 | ||
ca94c442 LP |
1345 | |
1346 | /* Revert to default priority/policy when forking */ | |
1347 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1348 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1349 | |
4bcdf1d0 AG |
1350 | #ifdef CONFIG_GENERIC_HARDIRQS |
1351 | /* IRQ handler threads */ | |
1352 | unsigned irq_thread:1; | |
1353 | #endif | |
1354 | ||
1da177e4 LT |
1355 | pid_t pid; |
1356 | pid_t tgid; | |
0a425405 | 1357 | |
1314562a | 1358 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1359 | /* Canary value for the -fstack-protector gcc feature */ |
1360 | unsigned long stack_canary; | |
1314562a | 1361 | #endif |
e0032087 | 1362 | |
1da177e4 LT |
1363 | /* |
1364 | * pointers to (original) parent process, youngest child, younger sibling, | |
1365 | * older sibling, respectively. (p->father can be replaced with | |
f470021a | 1366 | * p->real_parent->pid) |
1da177e4 | 1367 | */ |
abd63bc3 KC |
1368 | struct task_struct __rcu *real_parent; /* real parent process */ |
1369 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1370 | /* |
f470021a | 1371 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1372 | */ |
1373 | struct list_head children; /* list of my children */ | |
1374 | struct list_head sibling; /* linkage in my parent's children list */ | |
1375 | struct task_struct *group_leader; /* threadgroup leader */ | |
1376 | ||
f470021a RM |
1377 | /* |
1378 | * ptraced is the list of tasks this task is using ptrace on. | |
1379 | * This includes both natural children and PTRACE_ATTACH targets. | |
1380 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1381 | */ | |
1382 | struct list_head ptraced; | |
1383 | struct list_head ptrace_entry; | |
1384 | ||
1da177e4 | 1385 | /* PID/PID hash table linkage. */ |
92476d7f | 1386 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1387 | struct list_head thread_group; |
1da177e4 LT |
1388 | |
1389 | struct completion *vfork_done; /* for vfork() */ | |
1390 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1391 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1392 | ||
c66f08be | 1393 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1394 | cputime_t gtime; |
d99ca3b9 | 1395 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
9301899b | 1396 | cputime_t prev_utime, prev_stime; |
d99ca3b9 | 1397 | #endif |
1da177e4 | 1398 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1399 | struct timespec start_time; /* monotonic time */ |
1400 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1401 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1402 | unsigned long min_flt, maj_flt; | |
1403 | ||
f06febc9 | 1404 | struct task_cputime cputime_expires; |
1da177e4 LT |
1405 | struct list_head cpu_timers[3]; |
1406 | ||
1407 | /* process credentials */ | |
1b0ba1c9 | 1408 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1409 | * credentials (COW) */ |
1b0ba1c9 | 1410 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1411 | * credentials (COW) */ |
ee18d64c | 1412 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
b6dff3ec | 1413 | |
36772092 PBG |
1414 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1415 | - access with [gs]et_task_comm (which lock | |
1416 | it with task_lock()) | |
221af7f8 | 1417 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1418 | /* file system info */ |
1419 | int link_count, total_link_count; | |
3d5b6fcc | 1420 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1421 | /* ipc stuff */ |
1422 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1423 | #endif |
e162b39a | 1424 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1425 | /* hung task detection */ |
82a1fcb9 IM |
1426 | unsigned long last_switch_count; |
1427 | #endif | |
1da177e4 LT |
1428 | /* CPU-specific state of this task */ |
1429 | struct thread_struct thread; | |
1430 | /* filesystem information */ | |
1431 | struct fs_struct *fs; | |
1432 | /* open file information */ | |
1433 | struct files_struct *files; | |
1651e14e | 1434 | /* namespaces */ |
ab516013 | 1435 | struct nsproxy *nsproxy; |
1da177e4 LT |
1436 | /* signal handlers */ |
1437 | struct signal_struct *signal; | |
1438 | struct sighand_struct *sighand; | |
1439 | ||
1440 | sigset_t blocked, real_blocked; | |
f3de272b | 1441 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1442 | struct sigpending pending; |
1443 | ||
1444 | unsigned long sas_ss_sp; | |
1445 | size_t sas_ss_size; | |
1446 | int (*notifier)(void *priv); | |
1447 | void *notifier_data; | |
1448 | sigset_t *notifier_mask; | |
1da177e4 | 1449 | struct audit_context *audit_context; |
bfef93a5 AV |
1450 | #ifdef CONFIG_AUDITSYSCALL |
1451 | uid_t loginuid; | |
4746ec5b | 1452 | unsigned int sessionid; |
bfef93a5 | 1453 | #endif |
1da177e4 LT |
1454 | seccomp_t seccomp; |
1455 | ||
1456 | /* Thread group tracking */ | |
1457 | u32 parent_exec_id; | |
1458 | u32 self_exec_id; | |
58568d2a MX |
1459 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1460 | * mempolicy */ | |
1da177e4 | 1461 | spinlock_t alloc_lock; |
1da177e4 | 1462 | |
b29739f9 | 1463 | /* Protection of the PI data structures: */ |
1d615482 | 1464 | raw_spinlock_t pi_lock; |
b29739f9 | 1465 | |
23f78d4a IM |
1466 | #ifdef CONFIG_RT_MUTEXES |
1467 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1468 | struct plist_head pi_waiters; | |
1469 | /* Deadlock detection and priority inheritance handling */ | |
1470 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1471 | #endif |
1472 | ||
408894ee IM |
1473 | #ifdef CONFIG_DEBUG_MUTEXES |
1474 | /* mutex deadlock detection */ | |
1475 | struct mutex_waiter *blocked_on; | |
1476 | #endif | |
de30a2b3 IM |
1477 | #ifdef CONFIG_TRACE_IRQFLAGS |
1478 | unsigned int irq_events; | |
de30a2b3 | 1479 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1480 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1481 | unsigned int hardirq_enable_event; |
de30a2b3 | 1482 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1483 | int hardirqs_enabled; |
1484 | int hardirq_context; | |
de30a2b3 | 1485 | unsigned long softirq_disable_ip; |
de30a2b3 | 1486 | unsigned long softirq_enable_ip; |
fa1452e8 | 1487 | unsigned int softirq_disable_event; |
de30a2b3 | 1488 | unsigned int softirq_enable_event; |
fa1452e8 | 1489 | int softirqs_enabled; |
de30a2b3 IM |
1490 | int softirq_context; |
1491 | #endif | |
fbb9ce95 | 1492 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1493 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1494 | u64 curr_chain_key; |
1495 | int lockdep_depth; | |
fbb9ce95 | 1496 | unsigned int lockdep_recursion; |
c7aceaba | 1497 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1498 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1499 | #endif |
408894ee | 1500 | |
1da177e4 LT |
1501 | /* journalling filesystem info */ |
1502 | void *journal_info; | |
1503 | ||
d89d8796 | 1504 | /* stacked block device info */ |
bddd87c7 | 1505 | struct bio_list *bio_list; |
d89d8796 | 1506 | |
73c10101 JA |
1507 | #ifdef CONFIG_BLOCK |
1508 | /* stack plugging */ | |
1509 | struct blk_plug *plug; | |
1510 | #endif | |
1511 | ||
1da177e4 LT |
1512 | /* VM state */ |
1513 | struct reclaim_state *reclaim_state; | |
1514 | ||
1da177e4 LT |
1515 | struct backing_dev_info *backing_dev_info; |
1516 | ||
1517 | struct io_context *io_context; | |
1518 | ||
1519 | unsigned long ptrace_message; | |
1520 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1521 | struct task_io_accounting ioac; |
8f0ab514 | 1522 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1523 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1524 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1525 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1526 | #endif |
1527 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1528 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1529 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1530 | int cpuset_mem_spread_rotor; |
6adef3eb | 1531 | int cpuset_slab_spread_rotor; |
1da177e4 | 1532 | #endif |
ddbcc7e8 | 1533 | #ifdef CONFIG_CGROUPS |
817929ec | 1534 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1535 | struct css_set __rcu *cgroups; |
817929ec PM |
1536 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1537 | struct list_head cg_list; | |
ddbcc7e8 | 1538 | #endif |
42b2dd0a | 1539 | #ifdef CONFIG_FUTEX |
0771dfef | 1540 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1541 | #ifdef CONFIG_COMPAT |
1542 | struct compat_robust_list_head __user *compat_robust_list; | |
1543 | #endif | |
c87e2837 IM |
1544 | struct list_head pi_state_list; |
1545 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1546 | #endif |
cdd6c482 | 1547 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1548 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1549 | struct mutex perf_event_mutex; |
1550 | struct list_head perf_event_list; | |
a63eaf34 | 1551 | #endif |
c7aceaba | 1552 | #ifdef CONFIG_NUMA |
58568d2a | 1553 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1554 | short il_next; |
207205a2 | 1555 | short pref_node_fork; |
42b2dd0a | 1556 | #endif |
e56d0903 | 1557 | struct rcu_head rcu; |
b92ce558 JA |
1558 | |
1559 | /* | |
1560 | * cache last used pipe for splice | |
1561 | */ | |
1562 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1563 | #ifdef CONFIG_TASK_DELAY_ACCT |
1564 | struct task_delay_info *delays; | |
f4f154fd AM |
1565 | #endif |
1566 | #ifdef CONFIG_FAULT_INJECTION | |
1567 | int make_it_fail; | |
ca74e92b | 1568 | #endif |
9d823e8f WF |
1569 | /* |
1570 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1571 | * balance_dirty_pages() for some dirty throttling pause | |
1572 | */ | |
1573 | int nr_dirtied; | |
1574 | int nr_dirtied_pause; | |
83712358 | 1575 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1576 | |
9745512c AV |
1577 | #ifdef CONFIG_LATENCYTOP |
1578 | int latency_record_count; | |
1579 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1580 | #endif | |
6976675d AV |
1581 | /* |
1582 | * time slack values; these are used to round up poll() and | |
1583 | * select() etc timeout values. These are in nanoseconds. | |
1584 | */ | |
1585 | unsigned long timer_slack_ns; | |
1586 | unsigned long default_timer_slack_ns; | |
f8d570a4 DM |
1587 | |
1588 | struct list_head *scm_work_list; | |
fb52607a | 1589 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1590 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1591 | int curr_ret_stack; |
1592 | /* Stack of return addresses for return function tracing */ | |
1593 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1594 | /* time stamp for last schedule */ |
1595 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1596 | /* |
1597 | * Number of functions that haven't been traced | |
1598 | * because of depth overrun. | |
1599 | */ | |
1600 | atomic_t trace_overrun; | |
380c4b14 FW |
1601 | /* Pause for the tracing */ |
1602 | atomic_t tracing_graph_pause; | |
f201ae23 | 1603 | #endif |
ea4e2bc4 SR |
1604 | #ifdef CONFIG_TRACING |
1605 | /* state flags for use by tracers */ | |
1606 | unsigned long trace; | |
b1cff0ad | 1607 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1608 | unsigned long trace_recursion; |
1609 | #endif /* CONFIG_TRACING */ | |
569b846d KH |
1610 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ |
1611 | struct memcg_batch_info { | |
1612 | int do_batch; /* incremented when batch uncharge started */ | |
1613 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
7ffd4ca7 JW |
1614 | unsigned long nr_pages; /* uncharged usage */ |
1615 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ | |
569b846d KH |
1616 | } memcg_batch; |
1617 | #endif | |
bf26c018 FW |
1618 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
1619 | atomic_t ptrace_bp_refcnt; | |
1620 | #endif | |
1da177e4 LT |
1621 | }; |
1622 | ||
76e6eee0 | 1623 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1624 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1625 | |
e05606d3 IM |
1626 | /* |
1627 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1628 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1629 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1630 | * values are inverted: lower p->prio value means higher priority. | |
1631 | * | |
1632 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1633 | * RT priority to be separate from the value exported to | |
1634 | * user-space. This allows kernel threads to set their | |
1635 | * priority to a value higher than any user task. Note: | |
1636 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1637 | */ | |
1638 | ||
1639 | #define MAX_USER_RT_PRIO 100 | |
1640 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1641 | ||
1642 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1643 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1644 | ||
1645 | static inline int rt_prio(int prio) | |
1646 | { | |
1647 | if (unlikely(prio < MAX_RT_PRIO)) | |
1648 | return 1; | |
1649 | return 0; | |
1650 | } | |
1651 | ||
e868171a | 1652 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1653 | { |
1654 | return rt_prio(p->prio); | |
1655 | } | |
1656 | ||
e868171a | 1657 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1658 | { |
1659 | return task->pids[PIDTYPE_PID].pid; | |
1660 | } | |
1661 | ||
e868171a | 1662 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1663 | { |
1664 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1665 | } | |
1666 | ||
6dda81f4 ON |
1667 | /* |
1668 | * Without tasklist or rcu lock it is not safe to dereference | |
1669 | * the result of task_pgrp/task_session even if task == current, | |
1670 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1671 | */ | |
e868171a | 1672 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1673 | { |
1674 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1675 | } | |
1676 | ||
e868171a | 1677 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1678 | { |
1679 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1680 | } | |
1681 | ||
7af57294 PE |
1682 | struct pid_namespace; |
1683 | ||
1684 | /* | |
1685 | * the helpers to get the task's different pids as they are seen | |
1686 | * from various namespaces | |
1687 | * | |
1688 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1689 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1690 | * current. | |
7af57294 PE |
1691 | * task_xid_nr_ns() : id seen from the ns specified; |
1692 | * | |
1693 | * set_task_vxid() : assigns a virtual id to a task; | |
1694 | * | |
7af57294 PE |
1695 | * see also pid_nr() etc in include/linux/pid.h |
1696 | */ | |
52ee2dfd ON |
1697 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1698 | struct pid_namespace *ns); | |
7af57294 | 1699 | |
e868171a | 1700 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1701 | { |
1702 | return tsk->pid; | |
1703 | } | |
1704 | ||
52ee2dfd ON |
1705 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1706 | struct pid_namespace *ns) | |
1707 | { | |
1708 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1709 | } | |
7af57294 PE |
1710 | |
1711 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1712 | { | |
52ee2dfd | 1713 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1714 | } |
1715 | ||
1716 | ||
e868171a | 1717 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1718 | { |
1719 | return tsk->tgid; | |
1720 | } | |
1721 | ||
2f2a3a46 | 1722 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1723 | |
1724 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1725 | { | |
1726 | return pid_vnr(task_tgid(tsk)); | |
1727 | } | |
1728 | ||
1729 | ||
52ee2dfd ON |
1730 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1731 | struct pid_namespace *ns) | |
7af57294 | 1732 | { |
52ee2dfd | 1733 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1734 | } |
1735 | ||
7af57294 PE |
1736 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1737 | { | |
52ee2dfd | 1738 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1739 | } |
1740 | ||
1741 | ||
52ee2dfd ON |
1742 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1743 | struct pid_namespace *ns) | |
7af57294 | 1744 | { |
52ee2dfd | 1745 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1746 | } |
1747 | ||
7af57294 PE |
1748 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1749 | { | |
52ee2dfd | 1750 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1751 | } |
1752 | ||
1b0f7ffd ON |
1753 | /* obsolete, do not use */ |
1754 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1755 | { | |
1756 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1757 | } | |
7af57294 | 1758 | |
1da177e4 LT |
1759 | /** |
1760 | * pid_alive - check that a task structure is not stale | |
1761 | * @p: Task structure to be checked. | |
1762 | * | |
1763 | * Test if a process is not yet dead (at most zombie state) | |
1764 | * If pid_alive fails, then pointers within the task structure | |
1765 | * can be stale and must not be dereferenced. | |
1766 | */ | |
e868171a | 1767 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1768 | { |
92476d7f | 1769 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1770 | } |
1771 | ||
f400e198 | 1772 | /** |
b460cbc5 | 1773 | * is_global_init - check if a task structure is init |
3260259f HK |
1774 | * @tsk: Task structure to be checked. |
1775 | * | |
1776 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1777 | */ |
e868171a | 1778 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1779 | { |
1780 | return tsk->pid == 1; | |
1781 | } | |
b460cbc5 SH |
1782 | |
1783 | /* | |
1784 | * is_container_init: | |
1785 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1786 | */ |
b461cc03 | 1787 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1788 | |
9ec52099 CLG |
1789 | extern struct pid *cad_pid; |
1790 | ||
1da177e4 | 1791 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1792 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1793 | |
158d9ebd | 1794 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1795 | |
1796 | static inline void put_task_struct(struct task_struct *t) | |
1797 | { | |
1798 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1799 | __put_task_struct(t); |
e56d0903 | 1800 | } |
1da177e4 | 1801 | |
d180c5bc | 1802 | extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
0cf55e1e | 1803 | extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
49048622 | 1804 | |
1da177e4 LT |
1805 | /* |
1806 | * Per process flags | |
1807 | */ | |
1da177e4 | 1808 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1809 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1810 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1811 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1812 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1813 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1814 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1815 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1816 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1817 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1818 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1819 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
1da177e4 LT |
1820 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1821 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1822 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1823 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
1da177e4 | 1824 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1825 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1826 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1827 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1828 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1829 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
9985b0ba | 1830 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
4db96cf0 | 1831 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
c61afb18 | 1832 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1833 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1834 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1da177e4 LT |
1835 | |
1836 | /* | |
1837 | * Only the _current_ task can read/write to tsk->flags, but other | |
1838 | * tasks can access tsk->flags in readonly mode for example | |
1839 | * with tsk_used_math (like during threaded core dumping). | |
1840 | * There is however an exception to this rule during ptrace | |
1841 | * or during fork: the ptracer task is allowed to write to the | |
1842 | * child->flags of its traced child (same goes for fork, the parent | |
1843 | * can write to the child->flags), because we're guaranteed the | |
1844 | * child is not running and in turn not changing child->flags | |
1845 | * at the same time the parent does it. | |
1846 | */ | |
1847 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1848 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1849 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1850 | #define set_used_math() set_stopped_child_used_math(current) | |
1851 | #define conditional_stopped_child_used_math(condition, child) \ | |
1852 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1853 | #define conditional_used_math(condition) \ | |
1854 | conditional_stopped_child_used_math(condition, current) | |
1855 | #define copy_to_stopped_child_used_math(child) \ | |
1856 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1857 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1858 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1859 | #define used_math() tsk_used_math(current) | |
1860 | ||
e5c1902e | 1861 | /* |
a8f072c1 | 1862 | * task->jobctl flags |
e5c1902e | 1863 | */ |
a8f072c1 | 1864 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1865 | |
a8f072c1 TH |
1866 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1867 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1868 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1869 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1870 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1871 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1872 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
1873 | |
1874 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
1875 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
1876 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 1877 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 1878 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 1879 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 1880 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 1881 | |
fb1d910c | 1882 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1883 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 1884 | |
7dd3db54 TH |
1885 | extern bool task_set_jobctl_pending(struct task_struct *task, |
1886 | unsigned int mask); | |
73ddff2b | 1887 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
1888 | extern void task_clear_jobctl_pending(struct task_struct *task, |
1889 | unsigned int mask); | |
39efa3ef | 1890 | |
a57eb940 | 1891 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
1892 | |
1893 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1aa03f11 | 1894 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
f41d911f PM |
1895 | |
1896 | static inline void rcu_copy_process(struct task_struct *p) | |
1897 | { | |
1898 | p->rcu_read_lock_nesting = 0; | |
1899 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 1900 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 1901 | p->rcu_blocked_node = NULL; |
24278d14 PM |
1902 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1903 | #ifdef CONFIG_RCU_BOOST | |
1904 | p->rcu_boost_mutex = NULL; | |
1905 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
1906 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1907 | } | |
1908 | ||
f41d911f PM |
1909 | #else |
1910 | ||
1911 | static inline void rcu_copy_process(struct task_struct *p) | |
1912 | { | |
1913 | } | |
1914 | ||
1915 | #endif | |
1916 | ||
1da177e4 | 1917 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
1918 | extern void do_set_cpus_allowed(struct task_struct *p, |
1919 | const struct cpumask *new_mask); | |
1920 | ||
cd8ba7cd | 1921 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1922 | const struct cpumask *new_mask); |
1da177e4 | 1923 | #else |
1e1b6c51 KM |
1924 | static inline void do_set_cpus_allowed(struct task_struct *p, |
1925 | const struct cpumask *new_mask) | |
1926 | { | |
1927 | } | |
cd8ba7cd | 1928 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1929 | const struct cpumask *new_mask) |
1da177e4 | 1930 | { |
96f874e2 | 1931 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1932 | return -EINVAL; |
1933 | return 0; | |
1934 | } | |
1935 | #endif | |
e0ad9556 RR |
1936 | |
1937 | #ifndef CONFIG_CPUMASK_OFFSTACK | |
cd8ba7cd MT |
1938 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1939 | { | |
1940 | return set_cpus_allowed_ptr(p, &new_mask); | |
1941 | } | |
e0ad9556 | 1942 | #endif |
1da177e4 | 1943 | |
b342501c | 1944 | /* |
c676329a PZ |
1945 | * Do not use outside of architecture code which knows its limitations. |
1946 | * | |
1947 | * sched_clock() has no promise of monotonicity or bounded drift between | |
1948 | * CPUs, use (which you should not) requires disabling IRQs. | |
1949 | * | |
1950 | * Please use one of the three interfaces below. | |
b342501c | 1951 | */ |
1bbfa6f2 | 1952 | extern unsigned long long notrace sched_clock(void); |
c676329a PZ |
1953 | /* |
1954 | * See the comment in kernel/sched_clock.c | |
1955 | */ | |
1956 | extern u64 cpu_clock(int cpu); | |
1957 | extern u64 local_clock(void); | |
1958 | extern u64 sched_clock_cpu(int cpu); | |
1959 | ||
e436d800 | 1960 | |
c1955a3d | 1961 | extern void sched_clock_init(void); |
3e51f33f | 1962 | |
c1955a3d | 1963 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1964 | static inline void sched_clock_tick(void) |
1965 | { | |
1966 | } | |
1967 | ||
1968 | static inline void sched_clock_idle_sleep_event(void) | |
1969 | { | |
1970 | } | |
1971 | ||
1972 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1973 | { | |
1974 | } | |
1975 | #else | |
c676329a PZ |
1976 | /* |
1977 | * Architectures can set this to 1 if they have specified | |
1978 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1979 | * but then during bootup it turns out that sched_clock() | |
1980 | * is reliable after all: | |
1981 | */ | |
1982 | extern int sched_clock_stable; | |
1983 | ||
3e51f33f PZ |
1984 | extern void sched_clock_tick(void); |
1985 | extern void sched_clock_idle_sleep_event(void); | |
1986 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1987 | #endif | |
1988 | ||
b52bfee4 VP |
1989 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
1990 | /* | |
1991 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
1992 | * The reason for this explicit opt-in is not to have perf penalty with | |
1993 | * slow sched_clocks. | |
1994 | */ | |
1995 | extern void enable_sched_clock_irqtime(void); | |
1996 | extern void disable_sched_clock_irqtime(void); | |
1997 | #else | |
1998 | static inline void enable_sched_clock_irqtime(void) {} | |
1999 | static inline void disable_sched_clock_irqtime(void) {} | |
2000 | #endif | |
2001 | ||
36c8b586 | 2002 | extern unsigned long long |
41b86e9c | 2003 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2004 | |
2005 | /* sched_exec is called by processes performing an exec */ | |
2006 | #ifdef CONFIG_SMP | |
2007 | extern void sched_exec(void); | |
2008 | #else | |
2009 | #define sched_exec() {} | |
2010 | #endif | |
2011 | ||
2aa44d05 IM |
2012 | extern void sched_clock_idle_sleep_event(void); |
2013 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2014 | |
1da177e4 LT |
2015 | #ifdef CONFIG_HOTPLUG_CPU |
2016 | extern void idle_task_exit(void); | |
2017 | #else | |
2018 | static inline void idle_task_exit(void) {} | |
2019 | #endif | |
2020 | ||
06d8308c TG |
2021 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
2022 | extern void wake_up_idle_cpu(int cpu); | |
2023 | #else | |
2024 | static inline void wake_up_idle_cpu(int cpu) { } | |
2025 | #endif | |
2026 | ||
21805085 | 2027 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 2028 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 | 2029 | extern unsigned int sysctl_sched_wakeup_granularity; |
bf0f6f24 | 2030 | extern unsigned int sysctl_sched_child_runs_first; |
1983a922 CE |
2031 | |
2032 | enum sched_tunable_scaling { | |
2033 | SCHED_TUNABLESCALING_NONE, | |
2034 | SCHED_TUNABLESCALING_LOG, | |
2035 | SCHED_TUNABLESCALING_LINEAR, | |
2036 | SCHED_TUNABLESCALING_END, | |
2037 | }; | |
2038 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; | |
2039 | ||
2bba22c5 | 2040 | #ifdef CONFIG_SCHED_DEBUG |
da84d961 | 2041 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 2042 | extern unsigned int sysctl_sched_nr_migrate; |
e9e9250b | 2043 | extern unsigned int sysctl_sched_time_avg; |
cd1bb94b | 2044 | extern unsigned int sysctl_timer_migration; |
a7a4f8a7 | 2045 | extern unsigned int sysctl_sched_shares_window; |
b2be5e96 | 2046 | |
1983a922 | 2047 | int sched_proc_update_handler(struct ctl_table *table, int write, |
8d65af78 | 2048 | void __user *buffer, size_t *length, |
b2be5e96 | 2049 | loff_t *ppos); |
2bd8e6d4 | 2050 | #endif |
eea08f32 AB |
2051 | #ifdef CONFIG_SCHED_DEBUG |
2052 | static inline unsigned int get_sysctl_timer_migration(void) | |
2053 | { | |
2054 | return sysctl_timer_migration; | |
2055 | } | |
2056 | #else | |
2057 | static inline unsigned int get_sysctl_timer_migration(void) | |
2058 | { | |
2059 | return 1; | |
2060 | } | |
2061 | #endif | |
9f0c1e56 PZ |
2062 | extern unsigned int sysctl_sched_rt_period; |
2063 | extern int sysctl_sched_rt_runtime; | |
2bd8e6d4 | 2064 | |
d0b27fa7 | 2065 | int sched_rt_handler(struct ctl_table *table, int write, |
8d65af78 | 2066 | void __user *buffer, size_t *lenp, |
d0b27fa7 PZ |
2067 | loff_t *ppos); |
2068 | ||
5091faa4 MG |
2069 | #ifdef CONFIG_SCHED_AUTOGROUP |
2070 | extern unsigned int sysctl_sched_autogroup_enabled; | |
2071 | ||
2072 | extern void sched_autogroup_create_attach(struct task_struct *p); | |
2073 | extern void sched_autogroup_detach(struct task_struct *p); | |
2074 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2075 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2076 | #ifdef CONFIG_PROC_FS | |
2077 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2078 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2079 | #endif |
2080 | #else | |
2081 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2082 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2083 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2084 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2085 | #endif | |
2086 | ||
ec12cb7f PT |
2087 | #ifdef CONFIG_CFS_BANDWIDTH |
2088 | extern unsigned int sysctl_sched_cfs_bandwidth_slice; | |
2089 | #endif | |
2090 | ||
b29739f9 | 2091 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
2092 | extern int rt_mutex_getprio(struct task_struct *p); |
2093 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
2094 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
3c7d5184 TG |
2095 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
2096 | { | |
2097 | return tsk->pi_blocked_on != NULL; | |
2098 | } | |
b29739f9 | 2099 | #else |
e868171a | 2100 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
2101 | { |
2102 | return p->normal_prio; | |
2103 | } | |
95e02ca9 | 2104 | # define rt_mutex_adjust_pi(p) do { } while (0) |
3c7d5184 TG |
2105 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
2106 | { | |
2107 | return false; | |
2108 | } | |
b29739f9 IM |
2109 | #endif |
2110 | ||
d95f4122 | 2111 | extern bool yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2112 | extern void set_user_nice(struct task_struct *p, long nice); |
2113 | extern int task_prio(const struct task_struct *p); | |
2114 | extern int task_nice(const struct task_struct *p); | |
2115 | extern int can_nice(const struct task_struct *p, const int nice); | |
2116 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2117 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2118 | extern int sched_setscheduler(struct task_struct *, int, |
2119 | const struct sched_param *); | |
961ccddd | 2120 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2121 | const struct sched_param *); |
36c8b586 | 2122 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2123 | /** |
2124 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2125 | * @p: the task in question. |
c4f30608 | 2126 | */ |
7061ca3b | 2127 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2128 | { |
2129 | return p->pid == 0; | |
2130 | } | |
36c8b586 IM |
2131 | extern struct task_struct *curr_task(int cpu); |
2132 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2133 | |
2134 | void yield(void); | |
2135 | ||
2136 | /* | |
2137 | * The default (Linux) execution domain. | |
2138 | */ | |
2139 | extern struct exec_domain default_exec_domain; | |
2140 | ||
2141 | union thread_union { | |
2142 | struct thread_info thread_info; | |
2143 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2144 | }; | |
2145 | ||
2146 | #ifndef __HAVE_ARCH_KSTACK_END | |
2147 | static inline int kstack_end(void *addr) | |
2148 | { | |
2149 | /* Reliable end of stack detection: | |
2150 | * Some APM bios versions misalign the stack | |
2151 | */ | |
2152 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2153 | } | |
2154 | #endif | |
2155 | ||
2156 | extern union thread_union init_thread_union; | |
2157 | extern struct task_struct init_task; | |
2158 | ||
2159 | extern struct mm_struct init_mm; | |
2160 | ||
198fe21b PE |
2161 | extern struct pid_namespace init_pid_ns; |
2162 | ||
2163 | /* | |
2164 | * find a task by one of its numerical ids | |
2165 | * | |
198fe21b PE |
2166 | * find_task_by_pid_ns(): |
2167 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2168 | * find_task_by_vpid(): |
2169 | * finds a task by its virtual pid | |
198fe21b | 2170 | * |
e49859e7 | 2171 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2172 | */ |
2173 | ||
228ebcbe PE |
2174 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2175 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2176 | struct pid_namespace *ns); | |
198fe21b | 2177 | |
8520d7c7 | 2178 | extern void __set_special_pids(struct pid *pid); |
1da177e4 LT |
2179 | |
2180 | /* per-UID process charging. */ | |
acce292c | 2181 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1da177e4 LT |
2182 | static inline struct user_struct *get_uid(struct user_struct *u) |
2183 | { | |
2184 | atomic_inc(&u->__count); | |
2185 | return u; | |
2186 | } | |
2187 | extern void free_uid(struct user_struct *); | |
28f300d2 | 2188 | extern void release_uids(struct user_namespace *ns); |
1da177e4 LT |
2189 | |
2190 | #include <asm/current.h> | |
2191 | ||
f0af911a | 2192 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2193 | |
b3c97528 HH |
2194 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2195 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2196 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2197 | #ifdef CONFIG_SMP |
2198 | extern void kick_process(struct task_struct *tsk); | |
2199 | #else | |
2200 | static inline void kick_process(struct task_struct *tsk) { } | |
2201 | #endif | |
3e51e3ed | 2202 | extern void sched_fork(struct task_struct *p); |
ad46c2c4 | 2203 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2204 | |
1da177e4 LT |
2205 | extern void proc_caches_init(void); |
2206 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2207 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2208 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2209 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2210 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2211 | ||
2212 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2213 | { | |
2214 | unsigned long flags; | |
2215 | int ret; | |
2216 | ||
2217 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2218 | ret = dequeue_signal(tsk, mask, info); | |
2219 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2220 | ||
2221 | return ret; | |
53c8f9f1 | 2222 | } |
1da177e4 LT |
2223 | |
2224 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2225 | sigset_t *mask); | |
2226 | extern void unblock_all_signals(void); | |
2227 | extern void release_task(struct task_struct * p); | |
2228 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2229 | extern int force_sigsegv(int, struct task_struct *); |
2230 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2231 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2232 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2233 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2234 | const struct cred *, u32); | |
c4b92fc1 EB |
2235 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2236 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2237 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2238 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2239 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2240 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2241 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2242 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2243 | extern struct sigqueue *sigqueue_alloc(void); |
2244 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2245 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2246 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
2247 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2248 | ||
9ec52099 CLG |
2249 | static inline int kill_cad_pid(int sig, int priv) |
2250 | { | |
2251 | return kill_pid(cad_pid, sig, priv); | |
2252 | } | |
2253 | ||
1da177e4 LT |
2254 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2255 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2256 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2257 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2258 | ||
2a855dd0 SAS |
2259 | /* |
2260 | * True if we are on the alternate signal stack. | |
2261 | */ | |
1da177e4 LT |
2262 | static inline int on_sig_stack(unsigned long sp) |
2263 | { | |
2a855dd0 SAS |
2264 | #ifdef CONFIG_STACK_GROWSUP |
2265 | return sp >= current->sas_ss_sp && | |
2266 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2267 | #else | |
2268 | return sp > current->sas_ss_sp && | |
2269 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2270 | #endif | |
1da177e4 LT |
2271 | } |
2272 | ||
2273 | static inline int sas_ss_flags(unsigned long sp) | |
2274 | { | |
2275 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2276 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2277 | } | |
2278 | ||
1da177e4 LT |
2279 | /* |
2280 | * Routines for handling mm_structs | |
2281 | */ | |
2282 | extern struct mm_struct * mm_alloc(void); | |
2283 | ||
2284 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2285 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2286 | static inline void mmdrop(struct mm_struct * mm) |
2287 | { | |
6fb43d7b | 2288 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2289 | __mmdrop(mm); |
2290 | } | |
2291 | ||
2292 | /* mmput gets rid of the mappings and all user-space */ | |
2293 | extern void mmput(struct mm_struct *); | |
2294 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2295 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2296 | /* |
2297 | * Grab a reference to a task's mm, if it is not already going away | |
2298 | * and ptrace_may_access with the mode parameter passed to it | |
2299 | * succeeds. | |
2300 | */ | |
2301 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2302 | /* Remove the current tasks stale references to the old mm_struct */ |
2303 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2304 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2305 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2306 | |
6f2c55b8 AD |
2307 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
2308 | struct task_struct *, struct pt_regs *); | |
1da177e4 LT |
2309 | extern void flush_thread(void); |
2310 | extern void exit_thread(void); | |
2311 | ||
1da177e4 | 2312 | extern void exit_files(struct task_struct *); |
a7e5328a | 2313 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2314 | |
1da177e4 | 2315 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2316 | extern void flush_itimer_signals(void); |
1da177e4 | 2317 | |
9402c95f | 2318 | extern void do_group_exit(int); |
1da177e4 | 2319 | |
1da177e4 LT |
2320 | extern void daemonize(const char *, ...); |
2321 | extern int allow_signal(int); | |
2322 | extern int disallow_signal(int); | |
1da177e4 | 2323 | |
d7627467 DH |
2324 | extern int do_execve(const char *, |
2325 | const char __user * const __user *, | |
2326 | const char __user * const __user *, struct pt_regs *); | |
1da177e4 | 2327 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
36c8b586 | 2328 | struct task_struct *fork_idle(int); |
1da177e4 LT |
2329 | |
2330 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2331 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2332 | |
2333 | #ifdef CONFIG_SMP | |
317f3941 | 2334 | void scheduler_ipi(void); |
85ba2d86 | 2335 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2336 | #else |
184748cc | 2337 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2338 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2339 | long match_state) | |
2340 | { | |
2341 | return 1; | |
2342 | } | |
1da177e4 LT |
2343 | #endif |
2344 | ||
05725f7e JP |
2345 | #define next_task(p) \ |
2346 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2347 | |
2348 | #define for_each_process(p) \ | |
2349 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2350 | ||
5bb459bb | 2351 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2352 | |
1da177e4 LT |
2353 | /* |
2354 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2355 | * 'break' will not work as expected - use goto instead. | |
2356 | */ | |
2357 | #define do_each_thread(g, t) \ | |
2358 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2359 | ||
2360 | #define while_each_thread(g, t) \ | |
2361 | while ((t = next_thread(t)) != g) | |
2362 | ||
7e49827c ON |
2363 | static inline int get_nr_threads(struct task_struct *tsk) |
2364 | { | |
b3ac022c | 2365 | return tsk->signal->nr_threads; |
7e49827c ON |
2366 | } |
2367 | ||
087806b1 ON |
2368 | static inline bool thread_group_leader(struct task_struct *p) |
2369 | { | |
2370 | return p->exit_signal >= 0; | |
2371 | } | |
1da177e4 | 2372 | |
0804ef4b EB |
2373 | /* Do to the insanities of de_thread it is possible for a process |
2374 | * to have the pid of the thread group leader without actually being | |
2375 | * the thread group leader. For iteration through the pids in proc | |
2376 | * all we care about is that we have a task with the appropriate | |
2377 | * pid, we don't actually care if we have the right task. | |
2378 | */ | |
e868171a | 2379 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
2380 | { |
2381 | return p->pid == p->tgid; | |
2382 | } | |
2383 | ||
bac0abd6 PE |
2384 | static inline |
2385 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
2386 | { | |
2387 | return p1->tgid == p2->tgid; | |
2388 | } | |
2389 | ||
36c8b586 | 2390 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2391 | { |
05725f7e JP |
2392 | return list_entry_rcu(p->thread_group.next, |
2393 | struct task_struct, thread_group); | |
47e65328 ON |
2394 | } |
2395 | ||
e868171a | 2396 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2397 | { |
47e65328 | 2398 | return list_empty(&p->thread_group); |
1da177e4 LT |
2399 | } |
2400 | ||
2401 | #define delay_group_leader(p) \ | |
2402 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2403 | ||
1da177e4 | 2404 | /* |
260ea101 | 2405 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2406 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2407 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2408 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2409 | * |
2410 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2411 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2412 | * neither inside nor outside. | |
2413 | */ | |
2414 | static inline void task_lock(struct task_struct *p) | |
2415 | { | |
2416 | spin_lock(&p->alloc_lock); | |
2417 | } | |
2418 | ||
2419 | static inline void task_unlock(struct task_struct *p) | |
2420 | { | |
2421 | spin_unlock(&p->alloc_lock); | |
2422 | } | |
2423 | ||
b8ed374e | 2424 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2425 | unsigned long *flags); |
2426 | ||
9388dc30 AV |
2427 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2428 | unsigned long *flags) | |
2429 | { | |
2430 | struct sighand_struct *ret; | |
2431 | ||
2432 | ret = __lock_task_sighand(tsk, flags); | |
2433 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2434 | return ret; | |
2435 | } | |
b8ed374e | 2436 | |
f63ee72e ON |
2437 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2438 | unsigned long *flags) | |
2439 | { | |
2440 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2441 | } | |
2442 | ||
4714d1d3 | 2443 | #ifdef CONFIG_CGROUPS |
257058ae | 2444 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2445 | { |
257058ae | 2446 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2447 | } |
257058ae | 2448 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2449 | { |
257058ae | 2450 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2451 | } |
77e4ef99 TH |
2452 | |
2453 | /** | |
2454 | * threadgroup_lock - lock threadgroup | |
2455 | * @tsk: member task of the threadgroup to lock | |
2456 | * | |
2457 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2458 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
2459 | * perform exec. This is useful for cases where the threadgroup needs to | |
2460 | * stay stable across blockable operations. | |
2461 | * | |
2462 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2463 | * synchronization. While held, no new task will be added to threadgroup | |
2464 | * and no existing live task will have its PF_EXITING set. | |
2465 | * | |
2466 | * During exec, a task goes and puts its thread group through unusual | |
2467 | * changes. After de-threading, exclusive access is assumed to resources | |
2468 | * which are usually shared by tasks in the same group - e.g. sighand may | |
2469 | * be replaced with a new one. Also, the exec'ing task takes over group | |
2470 | * leader role including its pid. Exclude these changes while locked by | |
2471 | * grabbing cred_guard_mutex which is used to synchronize exec path. | |
2472 | */ | |
257058ae | 2473 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2474 | { |
77e4ef99 TH |
2475 | /* |
2476 | * exec uses exit for de-threading nesting group_rwsem inside | |
2477 | * cred_guard_mutex. Grab cred_guard_mutex first. | |
2478 | */ | |
2479 | mutex_lock(&tsk->signal->cred_guard_mutex); | |
257058ae | 2480 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2481 | } |
77e4ef99 TH |
2482 | |
2483 | /** | |
2484 | * threadgroup_unlock - unlock threadgroup | |
2485 | * @tsk: member task of the threadgroup to unlock | |
2486 | * | |
2487 | * Reverse threadgroup_lock(). | |
2488 | */ | |
257058ae | 2489 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2490 | { |
257058ae | 2491 | up_write(&tsk->signal->group_rwsem); |
77e4ef99 | 2492 | mutex_unlock(&tsk->signal->cred_guard_mutex); |
4714d1d3 BB |
2493 | } |
2494 | #else | |
257058ae TH |
2495 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2496 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2497 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2498 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2499 | #endif |
2500 | ||
f037360f AV |
2501 | #ifndef __HAVE_THREAD_FUNCTIONS |
2502 | ||
f7e4217b RZ |
2503 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2504 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2505 | |
10ebffde AV |
2506 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2507 | { | |
2508 | *task_thread_info(p) = *task_thread_info(org); | |
2509 | task_thread_info(p)->task = p; | |
2510 | } | |
2511 | ||
2512 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2513 | { | |
f7e4217b | 2514 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2515 | } |
2516 | ||
f037360f AV |
2517 | #endif |
2518 | ||
8b05c7e6 FT |
2519 | static inline int object_is_on_stack(void *obj) |
2520 | { | |
2521 | void *stack = task_stack_page(current); | |
2522 | ||
2523 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2524 | } | |
2525 | ||
8c9843e5 BH |
2526 | extern void thread_info_cache_init(void); |
2527 | ||
7c9f8861 ES |
2528 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2529 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2530 | { | |
2531 | unsigned long *n = end_of_stack(p); | |
2532 | ||
2533 | do { /* Skip over canary */ | |
2534 | n++; | |
2535 | } while (!*n); | |
2536 | ||
2537 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2538 | } | |
2539 | #endif | |
2540 | ||
1da177e4 LT |
2541 | /* set thread flags in other task's structures |
2542 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2543 | */ | |
2544 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2545 | { | |
a1261f54 | 2546 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2547 | } |
2548 | ||
2549 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2550 | { | |
a1261f54 | 2551 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2552 | } |
2553 | ||
2554 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2555 | { | |
a1261f54 | 2556 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2557 | } |
2558 | ||
2559 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2560 | { | |
a1261f54 | 2561 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2562 | } |
2563 | ||
2564 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2565 | { | |
a1261f54 | 2566 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2567 | } |
2568 | ||
2569 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2570 | { | |
2571 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2572 | } | |
2573 | ||
2574 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2575 | { | |
2576 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2577 | } | |
2578 | ||
8ae121ac GH |
2579 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2580 | { | |
2581 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2582 | } | |
2583 | ||
690cc3ff EB |
2584 | static inline int restart_syscall(void) |
2585 | { | |
2586 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2587 | return -ERESTARTNOINTR; | |
2588 | } | |
2589 | ||
1da177e4 LT |
2590 | static inline int signal_pending(struct task_struct *p) |
2591 | { | |
2592 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2593 | } | |
f776d12d | 2594 | |
d9588725 RM |
2595 | static inline int __fatal_signal_pending(struct task_struct *p) |
2596 | { | |
2597 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2598 | } | |
f776d12d MW |
2599 | |
2600 | static inline int fatal_signal_pending(struct task_struct *p) | |
2601 | { | |
2602 | return signal_pending(p) && __fatal_signal_pending(p); | |
2603 | } | |
2604 | ||
16882c1e ON |
2605 | static inline int signal_pending_state(long state, struct task_struct *p) |
2606 | { | |
2607 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2608 | return 0; | |
2609 | if (!signal_pending(p)) | |
2610 | return 0; | |
2611 | ||
16882c1e ON |
2612 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2613 | } | |
2614 | ||
1da177e4 LT |
2615 | static inline int need_resched(void) |
2616 | { | |
9404ef02 | 2617 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2618 | } |
2619 | ||
2620 | /* | |
2621 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2622 | * explicit rescheduling in places that are safe. The return | |
2623 | * value indicates whether a reschedule was done in fact. | |
2624 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2625 | * cond_resched_softirq() will enable bhs before scheduling. | |
2626 | */ | |
c3921ab7 | 2627 | extern int _cond_resched(void); |
6f80bd98 | 2628 | |
613afbf8 FW |
2629 | #define cond_resched() ({ \ |
2630 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2631 | _cond_resched(); \ | |
2632 | }) | |
6f80bd98 | 2633 | |
613afbf8 FW |
2634 | extern int __cond_resched_lock(spinlock_t *lock); |
2635 | ||
bdd4e85d | 2636 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2637 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2638 | #else |
716a4234 | 2639 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2640 | #endif |
716a4234 | 2641 | |
613afbf8 | 2642 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2643 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2644 | __cond_resched_lock(lock); \ |
2645 | }) | |
2646 | ||
2647 | extern int __cond_resched_softirq(void); | |
2648 | ||
75e1056f VP |
2649 | #define cond_resched_softirq() ({ \ |
2650 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2651 | __cond_resched_softirq(); \ | |
613afbf8 | 2652 | }) |
1da177e4 LT |
2653 | |
2654 | /* | |
2655 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2656 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2657 | * but a general need for low latency) | |
1da177e4 | 2658 | */ |
95c354fe | 2659 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2660 | { |
95c354fe NP |
2661 | #ifdef CONFIG_PREEMPT |
2662 | return spin_is_contended(lock); | |
2663 | #else | |
1da177e4 | 2664 | return 0; |
95c354fe | 2665 | #endif |
1da177e4 LT |
2666 | } |
2667 | ||
f06febc9 FM |
2668 | /* |
2669 | * Thread group CPU time accounting. | |
2670 | */ | |
4cd4c1b4 | 2671 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2672 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2673 | |
490dea45 | 2674 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2675 | { |
ee30a7b2 | 2676 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2677 | } |
2678 | ||
7bb44ade RM |
2679 | /* |
2680 | * Reevaluate whether the task has signals pending delivery. | |
2681 | * Wake the task if so. | |
2682 | * This is required every time the blocked sigset_t changes. | |
2683 | * callers must hold sighand->siglock. | |
2684 | */ | |
2685 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2686 | extern void recalc_sigpending(void); |
2687 | ||
2688 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
2689 | ||
2690 | /* | |
2691 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2692 | */ | |
2693 | #ifdef CONFIG_SMP | |
2694 | ||
2695 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2696 | { | |
a1261f54 | 2697 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2698 | } |
2699 | ||
c65cc870 | 2700 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2701 | |
2702 | #else | |
2703 | ||
2704 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2705 | { | |
2706 | return 0; | |
2707 | } | |
2708 | ||
2709 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2710 | { | |
2711 | } | |
2712 | ||
2713 | #endif /* CONFIG_SMP */ | |
2714 | ||
96f874e2 RR |
2715 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2716 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2717 | |
1da177e4 LT |
2718 | extern void normalize_rt_tasks(void); |
2719 | ||
7c941438 | 2720 | #ifdef CONFIG_CGROUP_SCHED |
9b5b7751 | 2721 | |
07e06b01 | 2722 | extern struct task_group root_task_group; |
9b5b7751 | 2723 | |
ec7dc8ac | 2724 | extern struct task_group *sched_create_group(struct task_group *parent); |
4cf86d77 | 2725 | extern void sched_destroy_group(struct task_group *tg); |
9b5b7751 | 2726 | extern void sched_move_task(struct task_struct *tsk); |
052f1dc7 | 2727 | #ifdef CONFIG_FAIR_GROUP_SCHED |
4cf86d77 | 2728 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2729 | extern unsigned long sched_group_shares(struct task_group *tg); |
052f1dc7 PZ |
2730 | #endif |
2731 | #ifdef CONFIG_RT_GROUP_SCHED | |
9f0c1e56 PZ |
2732 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2733 | long rt_runtime_us); | |
2734 | extern long sched_group_rt_runtime(struct task_group *tg); | |
d0b27fa7 PZ |
2735 | extern int sched_group_set_rt_period(struct task_group *tg, |
2736 | long rt_period_us); | |
2737 | extern long sched_group_rt_period(struct task_group *tg); | |
54e99124 | 2738 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
052f1dc7 | 2739 | #endif |
9b5b7751 SV |
2740 | #endif |
2741 | ||
54e99124 DG |
2742 | extern int task_can_switch_user(struct user_struct *up, |
2743 | struct task_struct *tsk); | |
2744 | ||
4b98d11b AD |
2745 | #ifdef CONFIG_TASK_XACCT |
2746 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2747 | { | |
940389b8 | 2748 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2749 | } |
2750 | ||
2751 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2752 | { | |
940389b8 | 2753 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2754 | } |
2755 | ||
2756 | static inline void inc_syscr(struct task_struct *tsk) | |
2757 | { | |
940389b8 | 2758 | tsk->ioac.syscr++; |
4b98d11b AD |
2759 | } |
2760 | ||
2761 | static inline void inc_syscw(struct task_struct *tsk) | |
2762 | { | |
940389b8 | 2763 | tsk->ioac.syscw++; |
4b98d11b AD |
2764 | } |
2765 | #else | |
2766 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2767 | { | |
2768 | } | |
2769 | ||
2770 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2771 | { | |
2772 | } | |
2773 | ||
2774 | static inline void inc_syscr(struct task_struct *tsk) | |
2775 | { | |
2776 | } | |
2777 | ||
2778 | static inline void inc_syscw(struct task_struct *tsk) | |
2779 | { | |
2780 | } | |
2781 | #endif | |
2782 | ||
82455257 DH |
2783 | #ifndef TASK_SIZE_OF |
2784 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2785 | #endif | |
2786 | ||
cf475ad2 BS |
2787 | #ifdef CONFIG_MM_OWNER |
2788 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2789 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2790 | #else | |
2791 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2792 | { | |
2793 | } | |
2794 | ||
2795 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2796 | { | |
2797 | } | |
2798 | #endif /* CONFIG_MM_OWNER */ | |
2799 | ||
3e10e716 JS |
2800 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2801 | unsigned int limit) | |
2802 | { | |
2803 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2804 | } | |
2805 | ||
2806 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2807 | unsigned int limit) | |
2808 | { | |
2809 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2810 | } | |
2811 | ||
2812 | static inline unsigned long rlimit(unsigned int limit) | |
2813 | { | |
2814 | return task_rlimit(current, limit); | |
2815 | } | |
2816 | ||
2817 | static inline unsigned long rlimit_max(unsigned int limit) | |
2818 | { | |
2819 | return task_rlimit_max(current, limit); | |
2820 | } | |
2821 | ||
1da177e4 LT |
2822 | #endif /* __KERNEL__ */ |
2823 | ||
2824 | #endif |