4 #include <asm/param.h> /* for HZ */
6 #include <linux/config.h>
7 #include <linux/capability.h>
8 #include <linux/threads.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/timex.h>
12 #include <linux/jiffies.h>
13 #include <linux/rbtree.h>
14 #include <linux/thread_info.h>
15 #include <linux/cpumask.h>
16 #include <linux/errno.h>
17 #include <linux/nodemask.h>
19 #include <asm/system.h>
20 #include <asm/semaphore.h>
22 #include <asm/ptrace.h>
24 #include <asm/cputime.h>
26 #include <linux/smp.h>
27 #include <linux/sem.h>
28 #include <linux/signal.h>
29 #include <linux/securebits.h>
30 #include <linux/fs_struct.h>
31 #include <linux/compiler.h>
32 #include <linux/completion.h>
33 #include <linux/pid.h>
34 #include <linux/percpu.h>
35 #include <linux/topology.h>
36 #include <linux/seccomp.h>
43 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
44 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
45 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
46 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
47 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
48 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
49 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
50 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
51 #define CLONE_THREAD 0x00010000 /* Same thread group? */
52 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
53 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
54 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
55 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
56 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
57 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
58 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
59 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
60 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
63 * List of flags we want to share for kernel threads,
64 * if only because they are not used by them anyway.
66 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
69 * These are the constant used to fake the fixed-point load-average
70 * counting. Some notes:
71 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
72 * a load-average precision of 10 bits integer + 11 bits fractional
73 * - if you want to count load-averages more often, you need more
74 * precision, or rounding will get you. With 2-second counting freq,
75 * the EXP_n values would be 1981, 2034 and 2043 if still using only
78 extern unsigned long avenrun[]; /* Load averages */
80 #define FSHIFT 11 /* nr of bits of precision */
81 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
82 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
83 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
84 #define EXP_5 2014 /* 1/exp(5sec/5min) */
85 #define EXP_15 2037 /* 1/exp(5sec/15min) */
87 #define CALC_LOAD(load,exp,n) \
89 load += n*(FIXED_1-exp); \
92 extern unsigned long total_forks;
93 extern int nr_threads;
95 DECLARE_PER_CPU(unsigned long, process_counts);
96 extern int nr_processes(void);
97 extern unsigned long nr_running(void);
98 extern unsigned long nr_uninterruptible(void);
99 extern unsigned long nr_iowait(void);
101 #include <linux/time.h>
102 #include <linux/param.h>
103 #include <linux/resource.h>
104 #include <linux/timer.h>
106 #include <asm/processor.h>
108 #define TASK_RUNNING 0
109 #define TASK_INTERRUPTIBLE 1
110 #define TASK_UNINTERRUPTIBLE 2
111 #define TASK_STOPPED 4
112 #define TASK_TRACED 8
113 #define EXIT_ZOMBIE 16
116 #define __set_task_state(tsk, state_value) \
117 do { (tsk)->state = (state_value); } while (0)
118 #define set_task_state(tsk, state_value) \
119 set_mb((tsk)->state, (state_value))
121 #define __set_current_state(state_value) \
122 do { current->state = (state_value); } while (0)
123 #define set_current_state(state_value) \
124 set_mb(current->state, (state_value))
126 /* Task command name length */
127 #define TASK_COMM_LEN 16
130 * Scheduling policies
132 #define SCHED_NORMAL 0
142 #include <linux/spinlock.h>
145 * This serializes "schedule()" and also protects
146 * the run-queue from deletions/modifications (but
147 * _adding_ to the beginning of the run-queue has
150 extern rwlock_t tasklist_lock;
151 extern spinlock_t mmlist_lock;
153 typedef struct task_struct task_t;
155 extern void sched_init(void);
156 extern void sched_init_smp(void);
157 extern void init_idle(task_t *idle, int cpu);
159 extern cpumask_t nohz_cpu_mask;
161 extern void show_state(void);
162 extern void show_regs(struct pt_regs *);
165 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
166 * task), SP is the stack pointer of the first frame that should be shown in the back
167 * trace (or NULL if the entire call-chain of the task should be shown).
169 extern void show_stack(struct task_struct *task, unsigned long *sp);
171 void io_schedule(void);
172 long io_schedule_timeout(long timeout);
174 extern void cpu_init (void);
175 extern void trap_init(void);
176 extern void update_process_times(int user);
177 extern void scheduler_tick(void);
179 /* Attach to any functions which should be ignored in wchan output. */
180 #define __sched __attribute__((__section__(".sched.text")))
181 /* Is this address in the __sched functions? */
182 extern int in_sched_functions(unsigned long addr);
184 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
185 extern signed long FASTCALL(schedule_timeout(signed long timeout));
186 asmlinkage void schedule(void);
190 /* Maximum number of active map areas.. This is a random (large) number */
191 #define DEFAULT_MAX_MAP_COUNT 65536
193 extern int sysctl_max_map_count;
195 #include <linux/aio.h>
198 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
199 unsigned long, unsigned long);
201 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
202 unsigned long len, unsigned long pgoff,
203 unsigned long flags);
204 extern void arch_unmap_area(struct mm_struct *, unsigned long);
205 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
207 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
208 #define get_mm_counter(mm, member) ((mm)->_##member)
209 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
210 #define inc_mm_counter(mm, member) (mm)->_##member++
211 #define dec_mm_counter(mm, member) (mm)->_##member--
212 typedef unsigned long mm_counter_t;
215 struct vm_area_struct * mmap; /* list of VMAs */
216 struct rb_root mm_rb;
217 struct vm_area_struct * mmap_cache; /* last find_vma result */
218 unsigned long (*get_unmapped_area) (struct file *filp,
219 unsigned long addr, unsigned long len,
220 unsigned long pgoff, unsigned long flags);
221 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
222 unsigned long mmap_base; /* base of mmap area */
223 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
224 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
226 atomic_t mm_users; /* How many users with user space? */
227 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
228 int map_count; /* number of VMAs */
229 struct rw_semaphore mmap_sem;
230 spinlock_t page_table_lock; /* Protects page tables and some counters */
232 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
233 * together off init_mm.mmlist, and are protected
237 unsigned long start_code, end_code, start_data, end_data;
238 unsigned long start_brk, brk, start_stack;
239 unsigned long arg_start, arg_end, env_start, env_end;
240 unsigned long total_vm, locked_vm, shared_vm;
241 unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
243 /* Special counters protected by the page_table_lock */
245 mm_counter_t _anon_rss;
247 unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
250 cpumask_t cpu_vm_mask;
252 /* Architecture-specific MM context */
253 mm_context_t context;
255 /* Token based thrashing protection. */
256 unsigned long swap_token_time;
259 /* coredumping support */
261 struct completion *core_startup_done, core_done;
264 rwlock_t ioctx_list_lock;
265 struct kioctx *ioctx_list;
267 struct kioctx default_kioctx;
269 unsigned long hiwater_rss; /* High-water RSS usage */
270 unsigned long hiwater_vm; /* High-water virtual memory usage */
273 struct sighand_struct {
275 struct k_sigaction action[_NSIG];
280 * NOTE! "signal_struct" does not have it's own
281 * locking, because a shared signal_struct always
282 * implies a shared sighand_struct, so locking
283 * sighand_struct is always a proper superset of
284 * the locking of signal_struct.
286 struct signal_struct {
290 wait_queue_head_t wait_chldexit; /* for wait4() */
292 /* current thread group signal load-balancing target: */
295 /* shared signal handling: */
296 struct sigpending shared_pending;
298 /* thread group exit support */
301 * - notify group_exit_task when ->count is equal to notify_count
302 * - everyone except group_exit_task is stopped during signal delivery
303 * of fatal signals, group_exit_task processes the signal.
305 struct task_struct *group_exit_task;
308 /* thread group stop support, overloads group_exit_code too */
309 int group_stop_count;
310 unsigned int flags; /* see SIGNAL_* flags below */
312 /* POSIX.1b Interval Timers */
313 struct list_head posix_timers;
315 /* ITIMER_REAL timer for the process */
316 struct timer_list real_timer;
317 unsigned long it_real_value, it_real_incr;
319 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
320 cputime_t it_prof_expires, it_virt_expires;
321 cputime_t it_prof_incr, it_virt_incr;
323 /* job control IDs */
327 /* boolean value for session group leader */
330 struct tty_struct *tty; /* NULL if no tty */
333 * Cumulative resource counters for dead threads in the group,
334 * and for reaped dead child processes forked by this group.
335 * Live threads maintain their own counters and add to these
336 * in __exit_signal, except for the group leader.
338 cputime_t utime, stime, cutime, cstime;
339 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
340 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
343 * Cumulative ns of scheduled CPU time for dead threads in the
344 * group, not including a zombie group leader. (This only differs
345 * from jiffies_to_ns(utime + stime) if sched_clock uses something
346 * other than jiffies.)
348 unsigned long long sched_time;
351 * We don't bother to synchronize most readers of this at all,
352 * because there is no reader checking a limit that actually needs
353 * to get both rlim_cur and rlim_max atomically, and either one
354 * alone is a single word that can safely be read normally.
355 * getrlimit/setrlimit use task_lock(current->group_leader) to
356 * protect this instead of the siglock, because they really
357 * have no need to disable irqs.
359 struct rlimit rlim[RLIM_NLIMITS];
361 struct list_head cpu_timers[3];
363 /* keep the process-shared keyrings here so that they do the right
364 * thing in threads created with CLONE_THREAD */
366 struct key *session_keyring; /* keyring inherited over fork */
367 struct key *process_keyring; /* keyring private to this process */
372 * Bits in flags field of signal_struct.
374 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
375 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
376 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
377 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
381 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
382 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
383 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
384 * are inverted: lower p->prio value means higher priority.
386 * The MAX_USER_RT_PRIO value allows the actual maximum
387 * RT priority to be separate from the value exported to
388 * user-space. This allows kernel threads to set their
389 * priority to a value higher than any user task. Note:
390 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
393 #define MAX_USER_RT_PRIO 100
394 #define MAX_RT_PRIO MAX_USER_RT_PRIO
396 #define MAX_PRIO (MAX_RT_PRIO + 40)
398 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
401 * Some day this will be a full-fledged user tracking system..
404 atomic_t __count; /* reference count */
405 atomic_t processes; /* How many processes does this user have? */
406 atomic_t files; /* How many open files does this user have? */
407 atomic_t sigpending; /* How many pending signals does this user have? */
408 /* protected by mq_lock */
409 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
410 unsigned long locked_shm; /* How many pages of mlocked shm ? */
413 struct key *uid_keyring; /* UID specific keyring */
414 struct key *session_keyring; /* UID's default session keyring */
417 /* Hash table maintenance information */
418 struct list_head uidhash_list;
422 extern struct user_struct *find_user(uid_t);
424 extern struct user_struct root_user;
425 #define INIT_USER (&root_user)
427 typedef struct prio_array prio_array_t;
428 struct backing_dev_info;
429 struct reclaim_state;
431 #ifdef CONFIG_SCHEDSTATS
433 /* cumulative counters */
434 unsigned long cpu_time, /* time spent on the cpu */
435 run_delay, /* time spent waiting on a runqueue */
436 pcnt; /* # of timeslices run on this cpu */
439 unsigned long last_arrival, /* when we last ran on a cpu */
440 last_queued; /* when we were last queued to run */
443 extern struct file_operations proc_schedstat_operations;
455 * sched-domains (multiprocessor balancing) declarations:
458 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
460 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
461 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
462 #define SD_BALANCE_EXEC 4 /* Balance on exec */
463 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
464 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
465 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
466 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
467 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
470 struct sched_group *next; /* Must be a circular list */
474 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
475 * single CPU. This is read only (except for setup, hotplug CPU).
477 unsigned long cpu_power;
480 struct sched_domain {
481 /* These fields must be setup */
482 struct sched_domain *parent; /* top domain must be null terminated */
483 struct sched_group *groups; /* the balancing groups of the domain */
484 cpumask_t span; /* span of all CPUs in this domain */
485 unsigned long min_interval; /* Minimum balance interval ms */
486 unsigned long max_interval; /* Maximum balance interval ms */
487 unsigned int busy_factor; /* less balancing by factor if busy */
488 unsigned int imbalance_pct; /* No balance until over watermark */
489 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
490 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
491 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
492 unsigned int busy_idx;
493 unsigned int idle_idx;
494 unsigned int newidle_idx;
495 unsigned int wake_idx;
496 unsigned int forkexec_idx;
497 int flags; /* See SD_* */
499 /* Runtime fields. */
500 unsigned long last_balance; /* init to jiffies. units in jiffies */
501 unsigned int balance_interval; /* initialise to 1. units in ms. */
502 unsigned int nr_balance_failed; /* initialise to 0 */
504 #ifdef CONFIG_SCHEDSTATS
505 /* load_balance() stats */
506 unsigned long lb_cnt[MAX_IDLE_TYPES];
507 unsigned long lb_failed[MAX_IDLE_TYPES];
508 unsigned long lb_balanced[MAX_IDLE_TYPES];
509 unsigned long lb_imbalance[MAX_IDLE_TYPES];
510 unsigned long lb_gained[MAX_IDLE_TYPES];
511 unsigned long lb_hot_gained[MAX_IDLE_TYPES];
512 unsigned long lb_nobusyg[MAX_IDLE_TYPES];
513 unsigned long lb_nobusyq[MAX_IDLE_TYPES];
515 /* Active load balancing */
516 unsigned long alb_cnt;
517 unsigned long alb_failed;
518 unsigned long alb_pushed;
520 /* sched_balance_exec() stats */
521 unsigned long sbe_attempts;
522 unsigned long sbe_pushed;
524 /* try_to_wake_up() stats */
525 unsigned long ttwu_wake_remote;
526 unsigned long ttwu_move_affine;
527 unsigned long ttwu_move_balance;
531 #ifdef ARCH_HAS_SCHED_DOMAIN
532 /* Useful helpers that arch setup code may use. Defined in kernel/sched.c */
533 extern cpumask_t cpu_isolated_map;
534 extern void init_sched_build_groups(struct sched_group groups[],
535 cpumask_t span, int (*group_fn)(int cpu));
536 extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
537 #endif /* ARCH_HAS_SCHED_DOMAIN */
538 #endif /* CONFIG_SMP */
541 struct io_context; /* See blkdev.h */
542 void exit_io_context(void);
545 #define NGROUPS_SMALL 32
546 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
550 gid_t small_block[NGROUPS_SMALL];
556 * get_group_info() must be called with the owning task locked (via task_lock())
557 * when task != current. The reason being that the vast majority of callers are
558 * looking at current->group_info, which can not be changed except by the
559 * current task. Changing current->group_info requires the task lock, too.
561 #define get_group_info(group_info) do { \
562 atomic_inc(&(group_info)->usage); \
565 #define put_group_info(group_info) do { \
566 if (atomic_dec_and_test(&(group_info)->usage)) \
567 groups_free(group_info); \
570 extern struct group_info *groups_alloc(int gidsetsize);
571 extern void groups_free(struct group_info *group_info);
572 extern int set_current_groups(struct group_info *group_info);
573 extern int groups_search(struct group_info *group_info, gid_t grp);
574 /* access the groups "array" with this macro */
575 #define GROUP_AT(gi, i) \
576 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
579 struct audit_context; /* See audit.c */
583 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
584 struct thread_info *thread_info;
586 unsigned long flags; /* per process flags, defined below */
587 unsigned long ptrace;
589 int lock_depth; /* BKL lock depth */
591 int prio, static_prio;
592 struct list_head run_list;
595 unsigned long sleep_avg;
596 unsigned long long timestamp, last_ran;
597 unsigned long long sched_time; /* sched_clock time spent running */
600 unsigned long policy;
601 cpumask_t cpus_allowed;
602 unsigned int time_slice, first_time_slice;
604 #ifdef CONFIG_SCHEDSTATS
605 struct sched_info sched_info;
608 struct list_head tasks;
610 * ptrace_list/ptrace_children forms the list of my children
611 * that were stolen by a ptracer.
613 struct list_head ptrace_children;
614 struct list_head ptrace_list;
616 struct mm_struct *mm, *active_mm;
619 struct linux_binfmt *binfmt;
621 int exit_code, exit_signal;
622 int pdeath_signal; /* The signal sent when the parent dies */
624 unsigned long personality;
629 * pointers to (original) parent process, youngest child, younger sibling,
630 * older sibling, respectively. (p->father can be replaced with
633 struct task_struct *real_parent; /* real parent process (when being debugged) */
634 struct task_struct *parent; /* parent process */
636 * children/sibling forms the list of my children plus the
637 * tasks I'm ptracing.
639 struct list_head children; /* list of my children */
640 struct list_head sibling; /* linkage in my parent's children list */
641 struct task_struct *group_leader; /* threadgroup leader */
643 /* PID/PID hash table linkage. */
644 struct pid pids[PIDTYPE_MAX];
646 struct completion *vfork_done; /* for vfork() */
647 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
648 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
650 unsigned long rt_priority;
651 cputime_t utime, stime;
652 unsigned long nvcsw, nivcsw; /* context switch counts */
653 struct timespec start_time;
654 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
655 unsigned long min_flt, maj_flt;
657 cputime_t it_prof_expires, it_virt_expires;
658 unsigned long long it_sched_expires;
659 struct list_head cpu_timers[3];
661 /* process credentials */
662 uid_t uid,euid,suid,fsuid;
663 gid_t gid,egid,sgid,fsgid;
664 struct group_info *group_info;
665 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
666 unsigned keep_capabilities:1;
667 struct user_struct *user;
669 struct key *thread_keyring; /* keyring private to this thread */
670 unsigned char jit_keyring; /* default keyring to attach requested keys to */
672 int oomkilladj; /* OOM kill score adjustment (bit shift). */
673 char comm[TASK_COMM_LEN]; /* executable name excluding path
674 - access with [gs]et_task_comm (which lock
676 - initialized normally by flush_old_exec */
677 /* file system info */
678 int link_count, total_link_count;
680 struct sysv_sem sysvsem;
681 /* CPU-specific state of this task */
682 struct thread_struct thread;
683 /* filesystem information */
684 struct fs_struct *fs;
685 /* open file information */
686 struct files_struct *files;
688 struct namespace *namespace;
689 /* signal handlers */
690 struct signal_struct *signal;
691 struct sighand_struct *sighand;
693 sigset_t blocked, real_blocked;
694 struct sigpending pending;
696 unsigned long sas_ss_sp;
698 int (*notifier)(void *priv);
700 sigset_t *notifier_mask;
703 struct audit_context *audit_context;
706 /* Thread group tracking */
709 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
710 spinlock_t alloc_lock;
711 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
712 spinlock_t proc_lock;
713 /* context-switch lock */
714 spinlock_t switch_lock;
716 /* journalling filesystem info */
720 struct reclaim_state *reclaim_state;
722 struct dentry *proc_dentry;
723 struct backing_dev_info *backing_dev_info;
725 struct io_context *io_context;
727 unsigned long ptrace_message;
728 siginfo_t *last_siginfo; /* For ptrace use. */
730 * current io wait handle: wait queue entry to use for io waits
731 * If this thread is processing aio, this points at the waitqueue
732 * inside the currently handled kiocb. It may be NULL (i.e. default
733 * to a stack based synchronous wait) if its doing sync IO.
735 wait_queue_t *io_wait;
736 /* i/o counters(bytes read/written, #syscalls */
737 u64 rchar, wchar, syscr, syscw;
738 #if defined(CONFIG_BSD_PROCESS_ACCT)
739 u64 acct_rss_mem1; /* accumulated rss usage */
740 u64 acct_vm_mem1; /* accumulated virtual memory usage */
741 clock_t acct_stimexpd; /* clock_t-converted stime since last update */
744 struct mempolicy *mempolicy;
747 #ifdef CONFIG_CPUSETS
748 struct cpuset *cpuset;
749 nodemask_t mems_allowed;
750 int cpuset_mems_generation;
754 static inline pid_t process_group(struct task_struct *tsk)
756 return tsk->signal->pgrp;
760 * pid_alive - check that a task structure is not stale
761 * @p: Task structure to be checked.
763 * Test if a process is not yet dead (at most zombie state)
764 * If pid_alive fails, then pointers within the task structure
765 * can be stale and must not be dereferenced.
767 static inline int pid_alive(struct task_struct *p)
769 return p->pids[PIDTYPE_PID].nr != 0;
772 extern void free_task(struct task_struct *tsk);
773 extern void __put_task_struct(struct task_struct *tsk);
774 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
775 #define put_task_struct(tsk) \
776 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
781 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
782 /* Not implemented yet, only for 486*/
783 #define PF_STARTING 0x00000002 /* being created */
784 #define PF_EXITING 0x00000004 /* getting shut down */
785 #define PF_DEAD 0x00000008 /* Dead */
786 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
787 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
788 #define PF_DUMPCORE 0x00000200 /* dumped core */
789 #define PF_SIGNALED 0x00000400 /* killed by a signal */
790 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
791 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
792 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
793 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
794 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
795 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
796 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
797 #define PF_KSWAPD 0x00040000 /* I am kswapd */
798 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
799 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
800 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
801 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
802 #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
805 * Only the _current_ task can read/write to tsk->flags, but other
806 * tasks can access tsk->flags in readonly mode for example
807 * with tsk_used_math (like during threaded core dumping).
808 * There is however an exception to this rule during ptrace
809 * or during fork: the ptracer task is allowed to write to the
810 * child->flags of its traced child (same goes for fork, the parent
811 * can write to the child->flags), because we're guaranteed the
812 * child is not running and in turn not changing child->flags
813 * at the same time the parent does it.
815 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
816 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
817 #define clear_used_math() clear_stopped_child_used_math(current)
818 #define set_used_math() set_stopped_child_used_math(current)
819 #define conditional_stopped_child_used_math(condition, child) \
820 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
821 #define conditional_used_math(condition) \
822 conditional_stopped_child_used_math(condition, current)
823 #define copy_to_stopped_child_used_math(child) \
824 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
825 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
826 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
827 #define used_math() tsk_used_math(current)
830 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
832 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
834 if (!cpus_intersects(new_mask, cpu_online_map))
840 extern unsigned long long sched_clock(void);
841 extern unsigned long long current_sched_time(const task_t *current_task);
843 /* sched_exec is called by processes performing an exec */
845 extern void sched_exec(void);
847 #define sched_exec() {}
850 #ifdef CONFIG_HOTPLUG_CPU
851 extern void idle_task_exit(void);
853 static inline void idle_task_exit(void) {}
856 extern void sched_idle_next(void);
857 extern void set_user_nice(task_t *p, long nice);
858 extern int task_prio(const task_t *p);
859 extern int task_nice(const task_t *p);
860 extern int can_nice(const task_t *p, const int nice);
861 extern int task_curr(const task_t *p);
862 extern int idle_cpu(int cpu);
863 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
864 extern task_t *idle_task(int cpu);
869 * The default (Linux) execution domain.
871 extern struct exec_domain default_exec_domain;
874 struct thread_info thread_info;
875 unsigned long stack[THREAD_SIZE/sizeof(long)];
878 #ifndef __HAVE_ARCH_KSTACK_END
879 static inline int kstack_end(void *addr)
881 /* Reliable end of stack detection:
882 * Some APM bios versions misalign the stack
884 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
888 extern union thread_union init_thread_union;
889 extern struct task_struct init_task;
891 extern struct mm_struct init_mm;
893 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
894 extern struct task_struct *find_task_by_pid_type(int type, int pid);
895 extern void set_special_pids(pid_t session, pid_t pgrp);
896 extern void __set_special_pids(pid_t session, pid_t pgrp);
898 /* per-UID process charging. */
899 extern struct user_struct * alloc_uid(uid_t);
900 static inline struct user_struct *get_uid(struct user_struct *u)
902 atomic_inc(&u->__count);
905 extern void free_uid(struct user_struct *);
906 extern void switch_uid(struct user_struct *);
908 #include <asm/current.h>
910 extern void do_timer(struct pt_regs *);
912 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
913 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
914 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
915 unsigned long clone_flags));
917 extern void kick_process(struct task_struct *tsk);
919 static inline void kick_process(struct task_struct *tsk) { }
921 extern void FASTCALL(sched_fork(task_t * p));
922 extern void FASTCALL(sched_exit(task_t * p));
924 extern int in_group_p(gid_t);
925 extern int in_egroup_p(gid_t);
927 extern void proc_caches_init(void);
928 extern void flush_signals(struct task_struct *);
929 extern void flush_signal_handlers(struct task_struct *, int force_default);
930 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
932 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
937 spin_lock_irqsave(&tsk->sighand->siglock, flags);
938 ret = dequeue_signal(tsk, mask, info);
939 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
944 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
946 extern void unblock_all_signals(void);
947 extern void release_task(struct task_struct * p);
948 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
949 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
950 extern int force_sigsegv(int, struct task_struct *);
951 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
952 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
953 extern int kill_pg_info(int, struct siginfo *, pid_t);
954 extern int kill_proc_info(int, struct siginfo *, pid_t);
955 extern void do_notify_parent(struct task_struct *, int);
956 extern void force_sig(int, struct task_struct *);
957 extern void force_sig_specific(int, struct task_struct *);
958 extern int send_sig(int, struct task_struct *, int);
959 extern void zap_other_threads(struct task_struct *p);
960 extern int kill_pg(pid_t, int, int);
961 extern int kill_sl(pid_t, int, int);
962 extern int kill_proc(pid_t, int, int);
963 extern struct sigqueue *sigqueue_alloc(void);
964 extern void sigqueue_free(struct sigqueue *);
965 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
966 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
967 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
968 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
970 /* These can be the second arg to send_sig_info/send_group_sig_info. */
971 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
972 #define SEND_SIG_PRIV ((struct siginfo *) 1)
973 #define SEND_SIG_FORCED ((struct siginfo *) 2)
975 /* True if we are on the alternate signal stack. */
977 static inline int on_sig_stack(unsigned long sp)
979 return (sp - current->sas_ss_sp < current->sas_ss_size);
982 static inline int sas_ss_flags(unsigned long sp)
984 return (current->sas_ss_size == 0 ? SS_DISABLE
985 : on_sig_stack(sp) ? SS_ONSTACK : 0);
989 #ifdef CONFIG_SECURITY
990 /* code is in security.c */
991 extern int capable(int cap);
993 static inline int capable(int cap)
995 if (cap_raised(current->cap_effective, cap)) {
996 current->flags |= PF_SUPERPRIV;
1004 * Routines for handling mm_structs
1006 extern struct mm_struct * mm_alloc(void);
1008 /* mmdrop drops the mm and the page tables */
1009 extern void FASTCALL(__mmdrop(struct mm_struct *));
1010 static inline void mmdrop(struct mm_struct * mm)
1012 if (atomic_dec_and_test(&mm->mm_count))
1016 /* mmput gets rid of the mappings and all user-space */
1017 extern void mmput(struct mm_struct *);
1018 /* Grab a reference to a task's mm, if it is not already going away */
1019 extern struct mm_struct *get_task_mm(struct task_struct *task);
1020 /* Remove the current tasks stale references to the old mm_struct */
1021 extern void mm_release(struct task_struct *, struct mm_struct *);
1023 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1024 extern void flush_thread(void);
1025 extern void exit_thread(void);
1027 extern void exit_files(struct task_struct *);
1028 extern void exit_signal(struct task_struct *);
1029 extern void __exit_signal(struct task_struct *);
1030 extern void exit_sighand(struct task_struct *);
1031 extern void __exit_sighand(struct task_struct *);
1032 extern void exit_itimers(struct signal_struct *);
1034 extern NORET_TYPE void do_group_exit(int);
1036 extern void daemonize(const char *, ...);
1037 extern int allow_signal(int);
1038 extern int disallow_signal(int);
1039 extern task_t *child_reaper;
1041 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1042 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1043 task_t *fork_idle(int);
1045 extern void set_task_comm(struct task_struct *tsk, char *from);
1046 extern void get_task_comm(char *to, struct task_struct *tsk);
1049 extern void wait_task_inactive(task_t * p);
1051 #define wait_task_inactive(p) do { } while (0)
1054 #define remove_parent(p) list_del_init(&(p)->sibling)
1055 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
1057 #define REMOVE_LINKS(p) do { \
1058 if (thread_group_leader(p)) \
1059 list_del_init(&(p)->tasks); \
1063 #define SET_LINKS(p) do { \
1064 if (thread_group_leader(p)) \
1065 list_add_tail(&(p)->tasks,&init_task.tasks); \
1066 add_parent(p, (p)->parent); \
1069 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
1070 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
1072 #define for_each_process(p) \
1073 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1076 * Careful: do_each_thread/while_each_thread is a double loop so
1077 * 'break' will not work as expected - use goto instead.
1079 #define do_each_thread(g, t) \
1080 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1082 #define while_each_thread(g, t) \
1083 while ((t = next_thread(t)) != g)
1085 extern task_t * FASTCALL(next_thread(const task_t *p));
1087 #define thread_group_leader(p) (p->pid == p->tgid)
1089 static inline int thread_group_empty(task_t *p)
1091 return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
1094 #define delay_group_leader(p) \
1095 (thread_group_leader(p) && !thread_group_empty(p))
1097 extern void unhash_process(struct task_struct *p);
1100 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
1101 * subscriptions and synchronises with wait4(). Also used in procfs.
1103 * Nests both inside and outside of read_lock(&tasklist_lock).
1104 * It must not be nested with write_lock_irq(&tasklist_lock),
1105 * neither inside nor outside.
1107 static inline void task_lock(struct task_struct *p)
1109 spin_lock(&p->alloc_lock);
1112 static inline void task_unlock(struct task_struct *p)
1114 spin_unlock(&p->alloc_lock);
1117 /* set thread flags in other task's structures
1118 * - see asm/thread_info.h for TIF_xxxx flags available
1120 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1122 set_ti_thread_flag(tsk->thread_info,flag);
1125 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1127 clear_ti_thread_flag(tsk->thread_info,flag);
1130 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1132 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
1135 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1137 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
1140 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1142 return test_ti_thread_flag(tsk->thread_info,flag);
1145 static inline void set_tsk_need_resched(struct task_struct *tsk)
1147 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1150 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1152 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1155 static inline int signal_pending(struct task_struct *p)
1157 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1160 static inline int need_resched(void)
1162 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1166 * cond_resched() and cond_resched_lock(): latency reduction via
1167 * explicit rescheduling in places that are safe. The return
1168 * value indicates whether a reschedule was done in fact.
1169 * cond_resched_lock() will drop the spinlock before scheduling,
1170 * cond_resched_softirq() will enable bhs before scheduling.
1172 extern int cond_resched(void);
1173 extern int cond_resched_lock(spinlock_t * lock);
1174 extern int cond_resched_softirq(void);
1177 * Does a critical section need to be broken due to another
1180 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1181 # define need_lockbreak(lock) ((lock)->break_lock)
1183 # define need_lockbreak(lock) 0
1187 * Does a critical section need to be broken due to another
1188 * task waiting or preemption being signalled:
1190 static inline int lock_need_resched(spinlock_t *lock)
1192 if (need_lockbreak(lock) || need_resched())
1197 /* Reevaluate whether the task has signals pending delivery.
1198 This is required every time the blocked sigset_t changes.
1199 callers must hold sighand->siglock. */
1201 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1202 extern void recalc_sigpending(void);
1204 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1207 * Wrappers for p->thread_info->cpu access. No-op on UP.
1211 static inline unsigned int task_cpu(const struct task_struct *p)
1213 return p->thread_info->cpu;
1216 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1218 p->thread_info->cpu = cpu;
1223 static inline unsigned int task_cpu(const struct task_struct *p)
1228 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1232 #endif /* CONFIG_SMP */
1234 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1235 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1237 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1239 mm->mmap_base = TASK_UNMAPPED_BASE;
1240 mm->get_unmapped_area = arch_get_unmapped_area;
1241 mm->unmap_area = arch_unmap_area;
1245 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1246 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1248 #ifdef CONFIG_MAGIC_SYSRQ
1250 extern void normalize_rt_tasks(void);
1256 * Checks whether we need to enter the refrigerator
1257 * and returns 1 if we did so.
1260 extern void refrigerator(unsigned long);
1261 extern int freeze_processes(void);
1262 extern void thaw_processes(void);
1264 static inline int try_to_freeze(unsigned long refrigerator_flags)
1266 if (unlikely(current->flags & PF_FREEZE)) {
1267 refrigerator(refrigerator_flags);
1273 static inline void refrigerator(unsigned long flag) {}
1274 static inline int freeze_processes(void) { BUG(); return 0; }
1275 static inline void thaw_processes(void) {}
1277 static inline int try_to_freeze(unsigned long refrigerator_flags)
1281 #endif /* CONFIG_PM */
1282 #endif /* __KERNEL__ */