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![Wolfgang Wander](/assets/img/avatar_default.png)
Ingo recently introduced a great speedup for allocating new mmaps using the free_area_cache pointer which boosts the specweb SSL benchmark by 4-5% and causes huge performance increases in thread creation. The downside of this patch is that it does lead to fragmentation in the mmap-ed areas (visible via /proc/self/maps), such that some applications that work fine under 2.4 kernels quickly run out of memory on any 2.6 kernel. The problem is twofold: 1) the free_area_cache is used to continue a search for memory where the last search ended. Before the change new areas were always searched from the base address on. So now new small areas are cluttering holes of all sizes throughout the whole mmap-able region whereas before small holes tended to close holes near the base leaving holes far from the base large and available for larger requests. 2) the free_area_cache also is set to the location of the last munmap-ed area so in scenarios where we allocate e.g. five regions of 1K each, then free regions 4 2 3 in this order the next request for 1K will be placed in the position of the old region 3, whereas before we appended it to the still active region 1, placing it at the location of the old region 2. Before we had 1 free region of 2K, now we only get two free regions of 1K -> fragmentation. The patch addresses thes issues by introducing yet another cache descriptor cached_hole_size that contains the largest known hole size below the current free_area_cache. If a new request comes in the size is compared against the cached_hole_size and if the request can be filled with a hole below free_area_cache the search is started from the base instead. The results look promising: Whereas 2.6.12-rc4 fragments quickly and my (earlier posted) leakme.c test program terminates after 50000+ iterations with 96 distinct and fragmented maps in /proc/self/maps it performs nicely (as expected) with thread creation, Ingo's test_str02 with 20000 threads requires 0.7s system time. Taking out Ingo's patch (un-patch available per request) by basically deleting all mentions of free_area_cache from the kernel and starting the search for new memory always at the respective bases we observe: leakme terminates successfully with 11 distinctive hardly fragmented areas in /proc/self/maps but thread creating is gringdingly slow: 30+s(!) system time for Ingo's test_str02 with 20000 threads. Now - drumroll ;-) the appended patch works fine with leakme: it ends with only 7 distinct areas in /proc/self/maps and also thread creation seems sufficiently fast with 0.71s for 20000 threads. Signed-off-by: Wolfgang Wander <wwc@rentec.com> Credit-to: "Richard Purdie" <rpurdie@rpsys.net> Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> (partly) Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1276 lines
40 KiB
C
1276 lines
40 KiB
C
#ifndef _LINUX_SCHED_H
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#define _LINUX_SCHED_H
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#include <asm/param.h> /* for HZ */
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#include <linux/config.h>
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#include <linux/capability.h>
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#include <linux/threads.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/timex.h>
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#include <linux/jiffies.h>
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#include <linux/rbtree.h>
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#include <linux/thread_info.h>
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#include <linux/cpumask.h>
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#include <linux/errno.h>
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#include <linux/nodemask.h>
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#include <asm/system.h>
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#include <asm/semaphore.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/mmu.h>
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#include <asm/cputime.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/signal.h>
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#include <linux/securebits.h>
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#include <linux/fs_struct.h>
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#include <linux/compiler.h>
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#include <linux/completion.h>
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#include <linux/pid.h>
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#include <linux/percpu.h>
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#include <linux/topology.h>
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#include <linux/seccomp.h>
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struct exec_domain;
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/*
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* cloning flags:
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*/
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#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
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#define CLONE_VM 0x00000100 /* set if VM shared between processes */
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#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
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#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
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#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
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#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
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#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
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#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
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#define CLONE_THREAD 0x00010000 /* Same thread group? */
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#define CLONE_NEWNS 0x00020000 /* New namespace group? */
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#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
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#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
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#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
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#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
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#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
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#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
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#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
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#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
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/*
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* List of flags we want to share for kernel threads,
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* if only because they are not used by them anyway.
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*/
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#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
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/*
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* These are the constant used to fake the fixed-point load-average
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* counting. Some notes:
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* - 11 bit fractions expand to 22 bits by the multiplies: this gives
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* a load-average precision of 10 bits integer + 11 bits fractional
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* - if you want to count load-averages more often, you need more
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* precision, or rounding will get you. With 2-second counting freq,
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* the EXP_n values would be 1981, 2034 and 2043 if still using only
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* 11 bit fractions.
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*/
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extern unsigned long avenrun[]; /* Load averages */
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#define FSHIFT 11 /* nr of bits of precision */
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#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
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#define LOAD_FREQ (5*HZ) /* 5 sec intervals */
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#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
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#define EXP_5 2014 /* 1/exp(5sec/5min) */
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#define EXP_15 2037 /* 1/exp(5sec/15min) */
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#define CALC_LOAD(load,exp,n) \
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load *= exp; \
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load += n*(FIXED_1-exp); \
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load >>= FSHIFT;
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extern unsigned long total_forks;
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extern int nr_threads;
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extern int last_pid;
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DECLARE_PER_CPU(unsigned long, process_counts);
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extern int nr_processes(void);
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extern unsigned long nr_running(void);
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extern unsigned long nr_uninterruptible(void);
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extern unsigned long nr_iowait(void);
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#include <linux/time.h>
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#include <linux/param.h>
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#include <linux/resource.h>
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#include <linux/timer.h>
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#include <asm/processor.h>
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#define TASK_RUNNING 0
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#define TASK_INTERRUPTIBLE 1
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#define TASK_UNINTERRUPTIBLE 2
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#define TASK_STOPPED 4
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#define TASK_TRACED 8
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#define EXIT_ZOMBIE 16
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#define EXIT_DEAD 32
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#define __set_task_state(tsk, state_value) \
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do { (tsk)->state = (state_value); } while (0)
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#define set_task_state(tsk, state_value) \
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set_mb((tsk)->state, (state_value))
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#define __set_current_state(state_value) \
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do { current->state = (state_value); } while (0)
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#define set_current_state(state_value) \
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set_mb(current->state, (state_value))
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/* Task command name length */
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#define TASK_COMM_LEN 16
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/*
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* Scheduling policies
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*/
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#define SCHED_NORMAL 0
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#define SCHED_FIFO 1
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#define SCHED_RR 2
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struct sched_param {
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int sched_priority;
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};
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#ifdef __KERNEL__
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#include <linux/spinlock.h>
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/*
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* This serializes "schedule()" and also protects
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* the run-queue from deletions/modifications (but
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* _adding_ to the beginning of the run-queue has
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* a separate lock).
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*/
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extern rwlock_t tasklist_lock;
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extern spinlock_t mmlist_lock;
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typedef struct task_struct task_t;
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extern void sched_init(void);
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extern void sched_init_smp(void);
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extern void init_idle(task_t *idle, int cpu);
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extern cpumask_t nohz_cpu_mask;
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extern void show_state(void);
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extern void show_regs(struct pt_regs *);
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/*
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* TASK is a pointer to the task whose backtrace we want to see (or NULL for current
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* task), SP is the stack pointer of the first frame that should be shown in the back
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* trace (or NULL if the entire call-chain of the task should be shown).
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*/
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extern void show_stack(struct task_struct *task, unsigned long *sp);
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void io_schedule(void);
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long io_schedule_timeout(long timeout);
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extern void cpu_init (void);
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extern void trap_init(void);
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extern void update_process_times(int user);
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extern void scheduler_tick(void);
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/* Attach to any functions which should be ignored in wchan output. */
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#define __sched __attribute__((__section__(".sched.text")))
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/* Is this address in the __sched functions? */
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extern int in_sched_functions(unsigned long addr);
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#define MAX_SCHEDULE_TIMEOUT LONG_MAX
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extern signed long FASTCALL(schedule_timeout(signed long timeout));
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asmlinkage void schedule(void);
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struct namespace;
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/* Maximum number of active map areas.. This is a random (large) number */
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#define DEFAULT_MAX_MAP_COUNT 65536
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extern int sysctl_max_map_count;
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#include <linux/aio.h>
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extern unsigned long
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arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
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unsigned long, unsigned long);
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extern unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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extern void arch_unmap_area(struct mm_struct *, unsigned long);
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extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
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#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
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#define get_mm_counter(mm, member) ((mm)->_##member)
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#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
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#define inc_mm_counter(mm, member) (mm)->_##member++
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#define dec_mm_counter(mm, member) (mm)->_##member--
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typedef unsigned long mm_counter_t;
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struct mm_struct {
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struct vm_area_struct * mmap; /* list of VMAs */
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struct rb_root mm_rb;
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struct vm_area_struct * mmap_cache; /* last find_vma result */
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unsigned long (*get_unmapped_area) (struct file *filp,
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unsigned long addr, unsigned long len,
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unsigned long pgoff, unsigned long flags);
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void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
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unsigned long mmap_base; /* base of mmap area */
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unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
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unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
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pgd_t * pgd;
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atomic_t mm_users; /* How many users with user space? */
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atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
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int map_count; /* number of VMAs */
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struct rw_semaphore mmap_sem;
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spinlock_t page_table_lock; /* Protects page tables and some counters */
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struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
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* together off init_mm.mmlist, and are protected
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* by mmlist_lock
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*/
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unsigned long start_code, end_code, start_data, end_data;
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unsigned long start_brk, brk, start_stack;
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unsigned long arg_start, arg_end, env_start, env_end;
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unsigned long total_vm, locked_vm, shared_vm;
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unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
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/* Special counters protected by the page_table_lock */
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mm_counter_t _rss;
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mm_counter_t _anon_rss;
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unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
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unsigned dumpable:1;
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cpumask_t cpu_vm_mask;
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/* Architecture-specific MM context */
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mm_context_t context;
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/* Token based thrashing protection. */
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unsigned long swap_token_time;
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char recent_pagein;
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/* coredumping support */
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int core_waiters;
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struct completion *core_startup_done, core_done;
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/* aio bits */
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rwlock_t ioctx_list_lock;
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struct kioctx *ioctx_list;
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struct kioctx default_kioctx;
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unsigned long hiwater_rss; /* High-water RSS usage */
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unsigned long hiwater_vm; /* High-water virtual memory usage */
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};
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struct sighand_struct {
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atomic_t count;
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struct k_sigaction action[_NSIG];
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spinlock_t siglock;
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};
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/*
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* NOTE! "signal_struct" does not have it's own
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* locking, because a shared signal_struct always
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* implies a shared sighand_struct, so locking
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* sighand_struct is always a proper superset of
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* the locking of signal_struct.
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*/
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struct signal_struct {
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atomic_t count;
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atomic_t live;
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wait_queue_head_t wait_chldexit; /* for wait4() */
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/* current thread group signal load-balancing target: */
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task_t *curr_target;
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/* shared signal handling: */
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struct sigpending shared_pending;
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/* thread group exit support */
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int group_exit_code;
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/* overloaded:
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* - notify group_exit_task when ->count is equal to notify_count
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* - everyone except group_exit_task is stopped during signal delivery
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* of fatal signals, group_exit_task processes the signal.
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*/
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struct task_struct *group_exit_task;
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int notify_count;
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/* thread group stop support, overloads group_exit_code too */
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int group_stop_count;
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unsigned int flags; /* see SIGNAL_* flags below */
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/* POSIX.1b Interval Timers */
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struct list_head posix_timers;
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/* ITIMER_REAL timer for the process */
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struct timer_list real_timer;
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unsigned long it_real_value, it_real_incr;
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/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
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cputime_t it_prof_expires, it_virt_expires;
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cputime_t it_prof_incr, it_virt_incr;
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/* job control IDs */
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pid_t pgrp;
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pid_t tty_old_pgrp;
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pid_t session;
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/* boolean value for session group leader */
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int leader;
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struct tty_struct *tty; /* NULL if no tty */
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/*
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* Cumulative resource counters for dead threads in the group,
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* and for reaped dead child processes forked by this group.
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* Live threads maintain their own counters and add to these
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* in __exit_signal, except for the group leader.
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*/
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cputime_t utime, stime, cutime, cstime;
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unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
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unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
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/*
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* Cumulative ns of scheduled CPU time for dead threads in the
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* group, not including a zombie group leader. (This only differs
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* from jiffies_to_ns(utime + stime) if sched_clock uses something
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* other than jiffies.)
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*/
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unsigned long long sched_time;
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/*
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* We don't bother to synchronize most readers of this at all,
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* because there is no reader checking a limit that actually needs
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* to get both rlim_cur and rlim_max atomically, and either one
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* alone is a single word that can safely be read normally.
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* getrlimit/setrlimit use task_lock(current->group_leader) to
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* protect this instead of the siglock, because they really
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* have no need to disable irqs.
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*/
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struct rlimit rlim[RLIM_NLIMITS];
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struct list_head cpu_timers[3];
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/* keep the process-shared keyrings here so that they do the right
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* thing in threads created with CLONE_THREAD */
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#ifdef CONFIG_KEYS
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struct key *session_keyring; /* keyring inherited over fork */
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struct key *process_keyring; /* keyring private to this process */
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#endif
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};
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/*
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* Bits in flags field of signal_struct.
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*/
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#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
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#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
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#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
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#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
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/*
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* Priority of a process goes from 0..MAX_PRIO-1, valid RT
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* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
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* in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
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* are inverted: lower p->prio value means higher priority.
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*
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* The MAX_USER_RT_PRIO value allows the actual maximum
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* RT priority to be separate from the value exported to
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* user-space. This allows kernel threads to set their
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* priority to a value higher than any user task. Note:
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* MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
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*/
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#define MAX_USER_RT_PRIO 100
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#define MAX_RT_PRIO MAX_USER_RT_PRIO
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#define MAX_PRIO (MAX_RT_PRIO + 40)
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#define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
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/*
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* Some day this will be a full-fledged user tracking system..
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*/
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struct user_struct {
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atomic_t __count; /* reference count */
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atomic_t processes; /* How many processes does this user have? */
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atomic_t files; /* How many open files does this user have? */
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atomic_t sigpending; /* How many pending signals does this user have? */
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/* protected by mq_lock */
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unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
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unsigned long locked_shm; /* How many pages of mlocked shm ? */
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#ifdef CONFIG_KEYS
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struct key *uid_keyring; /* UID specific keyring */
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struct key *session_keyring; /* UID's default session keyring */
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#endif
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/* Hash table maintenance information */
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struct list_head uidhash_list;
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uid_t uid;
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};
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extern struct user_struct *find_user(uid_t);
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extern struct user_struct root_user;
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#define INIT_USER (&root_user)
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typedef struct prio_array prio_array_t;
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struct backing_dev_info;
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struct reclaim_state;
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#ifdef CONFIG_SCHEDSTATS
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struct sched_info {
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/* cumulative counters */
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unsigned long cpu_time, /* time spent on the cpu */
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run_delay, /* time spent waiting on a runqueue */
|
|
pcnt; /* # of timeslices run on this cpu */
|
|
|
|
/* timestamps */
|
|
unsigned long last_arrival, /* when we last ran on a cpu */
|
|
last_queued; /* when we were last queued to run */
|
|
};
|
|
|
|
extern struct file_operations proc_schedstat_operations;
|
|
#endif
|
|
|
|
enum idle_type
|
|
{
|
|
SCHED_IDLE,
|
|
NOT_IDLE,
|
|
NEWLY_IDLE,
|
|
MAX_IDLE_TYPES
|
|
};
|
|
|
|
/*
|
|
* sched-domains (multiprocessor balancing) declarations:
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
|
|
|
|
#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
|
|
#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
|
|
#define SD_BALANCE_EXEC 4 /* Balance on exec */
|
|
#define SD_WAKE_IDLE 8 /* Wake to idle CPU on task wakeup */
|
|
#define SD_WAKE_AFFINE 16 /* Wake task to waking CPU */
|
|
#define SD_WAKE_BALANCE 32 /* Perform balancing at task wakeup */
|
|
#define SD_SHARE_CPUPOWER 64 /* Domain members share cpu power */
|
|
|
|
struct sched_group {
|
|
struct sched_group *next; /* Must be a circular list */
|
|
cpumask_t cpumask;
|
|
|
|
/*
|
|
* CPU power of this group, SCHED_LOAD_SCALE being max power for a
|
|
* single CPU. This is read only (except for setup, hotplug CPU).
|
|
*/
|
|
unsigned long cpu_power;
|
|
};
|
|
|
|
struct sched_domain {
|
|
/* These fields must be setup */
|
|
struct sched_domain *parent; /* top domain must be null terminated */
|
|
struct sched_group *groups; /* the balancing groups of the domain */
|
|
cpumask_t span; /* span of all CPUs in this domain */
|
|
unsigned long min_interval; /* Minimum balance interval ms */
|
|
unsigned long max_interval; /* Maximum balance interval ms */
|
|
unsigned int busy_factor; /* less balancing by factor if busy */
|
|
unsigned int imbalance_pct; /* No balance until over watermark */
|
|
unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
|
|
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
|
|
unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
|
|
int flags; /* See SD_* */
|
|
|
|
/* Runtime fields. */
|
|
unsigned long last_balance; /* init to jiffies. units in jiffies */
|
|
unsigned int balance_interval; /* initialise to 1. units in ms. */
|
|
unsigned int nr_balance_failed; /* initialise to 0 */
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
/* load_balance() stats */
|
|
unsigned long lb_cnt[MAX_IDLE_TYPES];
|
|
unsigned long lb_failed[MAX_IDLE_TYPES];
|
|
unsigned long lb_balanced[MAX_IDLE_TYPES];
|
|
unsigned long lb_imbalance[MAX_IDLE_TYPES];
|
|
unsigned long lb_gained[MAX_IDLE_TYPES];
|
|
unsigned long lb_hot_gained[MAX_IDLE_TYPES];
|
|
unsigned long lb_nobusyg[MAX_IDLE_TYPES];
|
|
unsigned long lb_nobusyq[MAX_IDLE_TYPES];
|
|
|
|
/* Active load balancing */
|
|
unsigned long alb_cnt;
|
|
unsigned long alb_failed;
|
|
unsigned long alb_pushed;
|
|
|
|
/* sched_balance_exec() stats */
|
|
unsigned long sbe_attempts;
|
|
unsigned long sbe_pushed;
|
|
|
|
/* try_to_wake_up() stats */
|
|
unsigned long ttwu_wake_remote;
|
|
unsigned long ttwu_move_affine;
|
|
unsigned long ttwu_move_balance;
|
|
#endif
|
|
};
|
|
|
|
#ifdef ARCH_HAS_SCHED_DOMAIN
|
|
/* Useful helpers that arch setup code may use. Defined in kernel/sched.c */
|
|
extern cpumask_t cpu_isolated_map;
|
|
extern void init_sched_build_groups(struct sched_group groups[],
|
|
cpumask_t span, int (*group_fn)(int cpu));
|
|
extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
|
|
#endif /* ARCH_HAS_SCHED_DOMAIN */
|
|
#endif /* CONFIG_SMP */
|
|
|
|
|
|
struct io_context; /* See blkdev.h */
|
|
void exit_io_context(void);
|
|
struct cpuset;
|
|
|
|
#define NGROUPS_SMALL 32
|
|
#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
|
|
struct group_info {
|
|
int ngroups;
|
|
atomic_t usage;
|
|
gid_t small_block[NGROUPS_SMALL];
|
|
int nblocks;
|
|
gid_t *blocks[0];
|
|
};
|
|
|
|
/*
|
|
* get_group_info() must be called with the owning task locked (via task_lock())
|
|
* when task != current. The reason being that the vast majority of callers are
|
|
* looking at current->group_info, which can not be changed except by the
|
|
* current task. Changing current->group_info requires the task lock, too.
|
|
*/
|
|
#define get_group_info(group_info) do { \
|
|
atomic_inc(&(group_info)->usage); \
|
|
} while (0)
|
|
|
|
#define put_group_info(group_info) do { \
|
|
if (atomic_dec_and_test(&(group_info)->usage)) \
|
|
groups_free(group_info); \
|
|
} while (0)
|
|
|
|
struct group_info *groups_alloc(int gidsetsize);
|
|
void groups_free(struct group_info *group_info);
|
|
int set_current_groups(struct group_info *group_info);
|
|
/* access the groups "array" with this macro */
|
|
#define GROUP_AT(gi, i) \
|
|
((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
|
|
|
|
|
|
struct audit_context; /* See audit.c */
|
|
struct mempolicy;
|
|
|
|
struct task_struct {
|
|
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
|
|
struct thread_info *thread_info;
|
|
atomic_t usage;
|
|
unsigned long flags; /* per process flags, defined below */
|
|
unsigned long ptrace;
|
|
|
|
int lock_depth; /* BKL lock depth */
|
|
|
|
int prio, static_prio;
|
|
struct list_head run_list;
|
|
prio_array_t *array;
|
|
|
|
unsigned long sleep_avg;
|
|
unsigned long long timestamp, last_ran;
|
|
unsigned long long sched_time; /* sched_clock time spent running */
|
|
int activated;
|
|
|
|
unsigned long policy;
|
|
cpumask_t cpus_allowed;
|
|
unsigned int time_slice, first_time_slice;
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
struct sched_info sched_info;
|
|
#endif
|
|
|
|
struct list_head tasks;
|
|
/*
|
|
* ptrace_list/ptrace_children forms the list of my children
|
|
* that were stolen by a ptracer.
|
|
*/
|
|
struct list_head ptrace_children;
|
|
struct list_head ptrace_list;
|
|
|
|
struct mm_struct *mm, *active_mm;
|
|
|
|
/* task state */
|
|
struct linux_binfmt *binfmt;
|
|
long exit_state;
|
|
int exit_code, exit_signal;
|
|
int pdeath_signal; /* The signal sent when the parent dies */
|
|
/* ??? */
|
|
unsigned long personality;
|
|
unsigned did_exec:1;
|
|
pid_t pid;
|
|
pid_t tgid;
|
|
/*
|
|
* pointers to (original) parent process, youngest child, younger sibling,
|
|
* older sibling, respectively. (p->father can be replaced with
|
|
* p->parent->pid)
|
|
*/
|
|
struct task_struct *real_parent; /* real parent process (when being debugged) */
|
|
struct task_struct *parent; /* parent process */
|
|
/*
|
|
* children/sibling forms the list of my children plus the
|
|
* tasks I'm ptracing.
|
|
*/
|
|
struct list_head children; /* list of my children */
|
|
struct list_head sibling; /* linkage in my parent's children list */
|
|
struct task_struct *group_leader; /* threadgroup leader */
|
|
|
|
/* PID/PID hash table linkage. */
|
|
struct pid pids[PIDTYPE_MAX];
|
|
|
|
struct completion *vfork_done; /* for vfork() */
|
|
int __user *set_child_tid; /* CLONE_CHILD_SETTID */
|
|
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
|
|
|
|
unsigned long rt_priority;
|
|
cputime_t utime, stime;
|
|
unsigned long nvcsw, nivcsw; /* context switch counts */
|
|
struct timespec start_time;
|
|
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
|
|
unsigned long min_flt, maj_flt;
|
|
|
|
cputime_t it_prof_expires, it_virt_expires;
|
|
unsigned long long it_sched_expires;
|
|
struct list_head cpu_timers[3];
|
|
|
|
/* process credentials */
|
|
uid_t uid,euid,suid,fsuid;
|
|
gid_t gid,egid,sgid,fsgid;
|
|
struct group_info *group_info;
|
|
kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
|
|
unsigned keep_capabilities:1;
|
|
struct user_struct *user;
|
|
#ifdef CONFIG_KEYS
|
|
struct key *thread_keyring; /* keyring private to this thread */
|
|
#endif
|
|
int oomkilladj; /* OOM kill score adjustment (bit shift). */
|
|
char comm[TASK_COMM_LEN]; /* executable name excluding path
|
|
- access with [gs]et_task_comm (which lock
|
|
it with task_lock())
|
|
- initialized normally by flush_old_exec */
|
|
/* file system info */
|
|
int link_count, total_link_count;
|
|
/* ipc stuff */
|
|
struct sysv_sem sysvsem;
|
|
/* CPU-specific state of this task */
|
|
struct thread_struct thread;
|
|
/* filesystem information */
|
|
struct fs_struct *fs;
|
|
/* open file information */
|
|
struct files_struct *files;
|
|
/* namespace */
|
|
struct namespace *namespace;
|
|
/* signal handlers */
|
|
struct signal_struct *signal;
|
|
struct sighand_struct *sighand;
|
|
|
|
sigset_t blocked, real_blocked;
|
|
struct sigpending pending;
|
|
|
|
unsigned long sas_ss_sp;
|
|
size_t sas_ss_size;
|
|
int (*notifier)(void *priv);
|
|
void *notifier_data;
|
|
sigset_t *notifier_mask;
|
|
|
|
void *security;
|
|
struct audit_context *audit_context;
|
|
seccomp_t seccomp;
|
|
|
|
/* Thread group tracking */
|
|
u32 parent_exec_id;
|
|
u32 self_exec_id;
|
|
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
|
|
spinlock_t alloc_lock;
|
|
/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
|
|
spinlock_t proc_lock;
|
|
/* context-switch lock */
|
|
spinlock_t switch_lock;
|
|
|
|
/* journalling filesystem info */
|
|
void *journal_info;
|
|
|
|
/* VM state */
|
|
struct reclaim_state *reclaim_state;
|
|
|
|
struct dentry *proc_dentry;
|
|
struct backing_dev_info *backing_dev_info;
|
|
|
|
struct io_context *io_context;
|
|
|
|
unsigned long ptrace_message;
|
|
siginfo_t *last_siginfo; /* For ptrace use. */
|
|
/*
|
|
* current io wait handle: wait queue entry to use for io waits
|
|
* If this thread is processing aio, this points at the waitqueue
|
|
* inside the currently handled kiocb. It may be NULL (i.e. default
|
|
* to a stack based synchronous wait) if its doing sync IO.
|
|
*/
|
|
wait_queue_t *io_wait;
|
|
/* i/o counters(bytes read/written, #syscalls */
|
|
u64 rchar, wchar, syscr, syscw;
|
|
#if defined(CONFIG_BSD_PROCESS_ACCT)
|
|
u64 acct_rss_mem1; /* accumulated rss usage */
|
|
u64 acct_vm_mem1; /* accumulated virtual memory usage */
|
|
clock_t acct_stimexpd; /* clock_t-converted stime since last update */
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
struct mempolicy *mempolicy;
|
|
short il_next;
|
|
#endif
|
|
#ifdef CONFIG_CPUSETS
|
|
struct cpuset *cpuset;
|
|
nodemask_t mems_allowed;
|
|
int cpuset_mems_generation;
|
|
#endif
|
|
};
|
|
|
|
static inline pid_t process_group(struct task_struct *tsk)
|
|
{
|
|
return tsk->signal->pgrp;
|
|
}
|
|
|
|
/**
|
|
* pid_alive - check that a task structure is not stale
|
|
* @p: Task structure to be checked.
|
|
*
|
|
* Test if a process is not yet dead (at most zombie state)
|
|
* If pid_alive fails, then pointers within the task structure
|
|
* can be stale and must not be dereferenced.
|
|
*/
|
|
static inline int pid_alive(struct task_struct *p)
|
|
{
|
|
return p->pids[PIDTYPE_PID].nr != 0;
|
|
}
|
|
|
|
extern void free_task(struct task_struct *tsk);
|
|
extern void __put_task_struct(struct task_struct *tsk);
|
|
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
|
|
#define put_task_struct(tsk) \
|
|
do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
|
|
|
|
/*
|
|
* Per process flags
|
|
*/
|
|
#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
|
|
/* Not implemented yet, only for 486*/
|
|
#define PF_STARTING 0x00000002 /* being created */
|
|
#define PF_EXITING 0x00000004 /* getting shut down */
|
|
#define PF_DEAD 0x00000008 /* Dead */
|
|
#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
|
|
#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
|
|
#define PF_DUMPCORE 0x00000200 /* dumped core */
|
|
#define PF_SIGNALED 0x00000400 /* killed by a signal */
|
|
#define PF_MEMALLOC 0x00000800 /* Allocating memory */
|
|
#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
|
|
#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
|
|
#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
|
|
#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
|
|
#define PF_FROZEN 0x00010000 /* frozen for system suspend */
|
|
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
|
|
#define PF_KSWAPD 0x00040000 /* I am kswapd */
|
|
#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
|
|
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
|
|
#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
|
|
#define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
|
|
#define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
|
|
|
|
/*
|
|
* Only the _current_ task can read/write to tsk->flags, but other
|
|
* tasks can access tsk->flags in readonly mode for example
|
|
* with tsk_used_math (like during threaded core dumping).
|
|
* There is however an exception to this rule during ptrace
|
|
* or during fork: the ptracer task is allowed to write to the
|
|
* child->flags of its traced child (same goes for fork, the parent
|
|
* can write to the child->flags), because we're guaranteed the
|
|
* child is not running and in turn not changing child->flags
|
|
* at the same time the parent does it.
|
|
*/
|
|
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
|
|
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
|
|
#define clear_used_math() clear_stopped_child_used_math(current)
|
|
#define set_used_math() set_stopped_child_used_math(current)
|
|
#define conditional_stopped_child_used_math(condition, child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
|
|
#define conditional_used_math(condition) \
|
|
conditional_stopped_child_used_math(condition, current)
|
|
#define copy_to_stopped_child_used_math(child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
|
|
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
|
|
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
|
|
#define used_math() tsk_used_math(current)
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
|
|
#else
|
|
static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
|
|
{
|
|
if (!cpus_intersects(new_mask, cpu_online_map))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
extern unsigned long long sched_clock(void);
|
|
extern unsigned long long current_sched_time(const task_t *current_task);
|
|
|
|
/* sched_exec is called by processes performing an exec */
|
|
#ifdef CONFIG_SMP
|
|
extern void sched_exec(void);
|
|
#else
|
|
#define sched_exec() {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void idle_task_exit(void);
|
|
#else
|
|
static inline void idle_task_exit(void) {}
|
|
#endif
|
|
|
|
extern void sched_idle_next(void);
|
|
extern void set_user_nice(task_t *p, long nice);
|
|
extern int task_prio(const task_t *p);
|
|
extern int task_nice(const task_t *p);
|
|
extern int can_nice(const task_t *p, const int nice);
|
|
extern int task_curr(const task_t *p);
|
|
extern int idle_cpu(int cpu);
|
|
extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
|
|
extern task_t *idle_task(int cpu);
|
|
|
|
void yield(void);
|
|
|
|
/*
|
|
* The default (Linux) execution domain.
|
|
*/
|
|
extern struct exec_domain default_exec_domain;
|
|
|
|
union thread_union {
|
|
struct thread_info thread_info;
|
|
unsigned long stack[THREAD_SIZE/sizeof(long)];
|
|
};
|
|
|
|
#ifndef __HAVE_ARCH_KSTACK_END
|
|
static inline int kstack_end(void *addr)
|
|
{
|
|
/* Reliable end of stack detection:
|
|
* Some APM bios versions misalign the stack
|
|
*/
|
|
return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
|
|
}
|
|
#endif
|
|
|
|
extern union thread_union init_thread_union;
|
|
extern struct task_struct init_task;
|
|
|
|
extern struct mm_struct init_mm;
|
|
|
|
#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
|
|
extern struct task_struct *find_task_by_pid_type(int type, int pid);
|
|
extern void set_special_pids(pid_t session, pid_t pgrp);
|
|
extern void __set_special_pids(pid_t session, pid_t pgrp);
|
|
|
|
/* per-UID process charging. */
|
|
extern struct user_struct * alloc_uid(uid_t);
|
|
static inline struct user_struct *get_uid(struct user_struct *u)
|
|
{
|
|
atomic_inc(&u->__count);
|
|
return u;
|
|
}
|
|
extern void free_uid(struct user_struct *);
|
|
extern void switch_uid(struct user_struct *);
|
|
|
|
#include <asm/current.h>
|
|
|
|
extern void do_timer(struct pt_regs *);
|
|
|
|
extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
|
|
extern int FASTCALL(wake_up_process(struct task_struct * tsk));
|
|
extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
|
|
unsigned long clone_flags));
|
|
#ifdef CONFIG_SMP
|
|
extern void kick_process(struct task_struct *tsk);
|
|
#else
|
|
static inline void kick_process(struct task_struct *tsk) { }
|
|
#endif
|
|
extern void FASTCALL(sched_fork(task_t * p));
|
|
extern void FASTCALL(sched_exit(task_t * p));
|
|
|
|
extern int in_group_p(gid_t);
|
|
extern int in_egroup_p(gid_t);
|
|
|
|
extern void proc_caches_init(void);
|
|
extern void flush_signals(struct task_struct *);
|
|
extern void flush_signal_handlers(struct task_struct *, int force_default);
|
|
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
|
|
|
|
static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&tsk->sighand->siglock, flags);
|
|
ret = dequeue_signal(tsk, mask, info);
|
|
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
extern void block_all_signals(int (*notifier)(void *priv), void *priv,
|
|
sigset_t *mask);
|
|
extern void unblock_all_signals(void);
|
|
extern void release_task(struct task_struct * p);
|
|
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int force_sigsegv(int, struct task_struct *);
|
|
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
|
|
extern int kill_pg_info(int, struct siginfo *, pid_t);
|
|
extern int kill_proc_info(int, struct siginfo *, pid_t);
|
|
extern void do_notify_parent(struct task_struct *, int);
|
|
extern void force_sig(int, struct task_struct *);
|
|
extern void force_sig_specific(int, struct task_struct *);
|
|
extern int send_sig(int, struct task_struct *, int);
|
|
extern void zap_other_threads(struct task_struct *p);
|
|
extern int kill_pg(pid_t, int, int);
|
|
extern int kill_sl(pid_t, int, int);
|
|
extern int kill_proc(pid_t, int, int);
|
|
extern struct sigqueue *sigqueue_alloc(void);
|
|
extern void sigqueue_free(struct sigqueue *);
|
|
extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
|
|
extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
|
|
extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
|
|
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
|
|
|
|
/* These can be the second arg to send_sig_info/send_group_sig_info. */
|
|
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
|
|
#define SEND_SIG_PRIV ((struct siginfo *) 1)
|
|
#define SEND_SIG_FORCED ((struct siginfo *) 2)
|
|
|
|
/* True if we are on the alternate signal stack. */
|
|
|
|
static inline int on_sig_stack(unsigned long sp)
|
|
{
|
|
return (sp - current->sas_ss_sp < current->sas_ss_size);
|
|
}
|
|
|
|
static inline int sas_ss_flags(unsigned long sp)
|
|
{
|
|
return (current->sas_ss_size == 0 ? SS_DISABLE
|
|
: on_sig_stack(sp) ? SS_ONSTACK : 0);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
/* code is in security.c */
|
|
extern int capable(int cap);
|
|
#else
|
|
static inline int capable(int cap)
|
|
{
|
|
if (cap_raised(current->cap_effective, cap)) {
|
|
current->flags |= PF_SUPERPRIV;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Routines for handling mm_structs
|
|
*/
|
|
extern struct mm_struct * mm_alloc(void);
|
|
|
|
/* mmdrop drops the mm and the page tables */
|
|
extern void FASTCALL(__mmdrop(struct mm_struct *));
|
|
static inline void mmdrop(struct mm_struct * mm)
|
|
{
|
|
if (atomic_dec_and_test(&mm->mm_count))
|
|
__mmdrop(mm);
|
|
}
|
|
|
|
/* mmput gets rid of the mappings and all user-space */
|
|
extern void mmput(struct mm_struct *);
|
|
/* Grab a reference to a task's mm, if it is not already going away */
|
|
extern struct mm_struct *get_task_mm(struct task_struct *task);
|
|
/* Remove the current tasks stale references to the old mm_struct */
|
|
extern void mm_release(struct task_struct *, struct mm_struct *);
|
|
|
|
extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
|
|
extern void flush_thread(void);
|
|
extern void exit_thread(void);
|
|
|
|
extern void exit_files(struct task_struct *);
|
|
extern void exit_signal(struct task_struct *);
|
|
extern void __exit_signal(struct task_struct *);
|
|
extern void exit_sighand(struct task_struct *);
|
|
extern void __exit_sighand(struct task_struct *);
|
|
extern void exit_itimers(struct signal_struct *);
|
|
|
|
extern NORET_TYPE void do_group_exit(int);
|
|
|
|
extern void daemonize(const char *, ...);
|
|
extern int allow_signal(int);
|
|
extern int disallow_signal(int);
|
|
extern task_t *child_reaper;
|
|
|
|
extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
|
|
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
|
|
task_t *fork_idle(int);
|
|
|
|
extern void set_task_comm(struct task_struct *tsk, char *from);
|
|
extern void get_task_comm(char *to, struct task_struct *tsk);
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void wait_task_inactive(task_t * p);
|
|
#else
|
|
#define wait_task_inactive(p) do { } while (0)
|
|
#endif
|
|
|
|
#define remove_parent(p) list_del_init(&(p)->sibling)
|
|
#define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
|
|
|
|
#define REMOVE_LINKS(p) do { \
|
|
if (thread_group_leader(p)) \
|
|
list_del_init(&(p)->tasks); \
|
|
remove_parent(p); \
|
|
} while (0)
|
|
|
|
#define SET_LINKS(p) do { \
|
|
if (thread_group_leader(p)) \
|
|
list_add_tail(&(p)->tasks,&init_task.tasks); \
|
|
add_parent(p, (p)->parent); \
|
|
} while (0)
|
|
|
|
#define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
|
|
#define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
|
|
|
|
#define for_each_process(p) \
|
|
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
|
|
|
|
/*
|
|
* Careful: do_each_thread/while_each_thread is a double loop so
|
|
* 'break' will not work as expected - use goto instead.
|
|
*/
|
|
#define do_each_thread(g, t) \
|
|
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
|
|
|
|
#define while_each_thread(g, t) \
|
|
while ((t = next_thread(t)) != g)
|
|
|
|
extern task_t * FASTCALL(next_thread(const task_t *p));
|
|
|
|
#define thread_group_leader(p) (p->pid == p->tgid)
|
|
|
|
static inline int thread_group_empty(task_t *p)
|
|
{
|
|
return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
|
|
}
|
|
|
|
#define delay_group_leader(p) \
|
|
(thread_group_leader(p) && !thread_group_empty(p))
|
|
|
|
extern void unhash_process(struct task_struct *p);
|
|
|
|
/*
|
|
* Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
|
|
* subscriptions and synchronises with wait4(). Also used in procfs.
|
|
*
|
|
* Nests both inside and outside of read_lock(&tasklist_lock).
|
|
* It must not be nested with write_lock_irq(&tasklist_lock),
|
|
* neither inside nor outside.
|
|
*/
|
|
static inline void task_lock(struct task_struct *p)
|
|
{
|
|
spin_lock(&p->alloc_lock);
|
|
}
|
|
|
|
static inline void task_unlock(struct task_struct *p)
|
|
{
|
|
spin_unlock(&p->alloc_lock);
|
|
}
|
|
|
|
/* set thread flags in other task's structures
|
|
* - see asm/thread_info.h for TIF_xxxx flags available
|
|
*/
|
|
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
set_ti_thread_flag(tsk->thread_info,flag);
|
|
}
|
|
|
|
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
clear_ti_thread_flag(tsk->thread_info,flag);
|
|
}
|
|
|
|
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_set_ti_thread_flag(tsk->thread_info,flag);
|
|
}
|
|
|
|
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
|
|
}
|
|
|
|
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_ti_thread_flag(tsk->thread_info,flag);
|
|
}
|
|
|
|
static inline void set_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline void clear_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline int signal_pending(struct task_struct *p)
|
|
{
|
|
return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
|
|
}
|
|
|
|
static inline int need_resched(void)
|
|
{
|
|
return unlikely(test_thread_flag(TIF_NEED_RESCHED));
|
|
}
|
|
|
|
/*
|
|
* cond_resched() and cond_resched_lock(): latency reduction via
|
|
* explicit rescheduling in places that are safe. The return
|
|
* value indicates whether a reschedule was done in fact.
|
|
* cond_resched_lock() will drop the spinlock before scheduling,
|
|
* cond_resched_softirq() will enable bhs before scheduling.
|
|
*/
|
|
extern int cond_resched(void);
|
|
extern int cond_resched_lock(spinlock_t * lock);
|
|
extern int cond_resched_softirq(void);
|
|
|
|
/*
|
|
* Does a critical section need to be broken due to another
|
|
* task waiting?:
|
|
*/
|
|
#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
|
|
# define need_lockbreak(lock) ((lock)->break_lock)
|
|
#else
|
|
# define need_lockbreak(lock) 0
|
|
#endif
|
|
|
|
/*
|
|
* Does a critical section need to be broken due to another
|
|
* task waiting or preemption being signalled:
|
|
*/
|
|
static inline int lock_need_resched(spinlock_t *lock)
|
|
{
|
|
if (need_lockbreak(lock) || need_resched())
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Reevaluate whether the task has signals pending delivery.
|
|
This is required every time the blocked sigset_t changes.
|
|
callers must hold sighand->siglock. */
|
|
|
|
extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
|
|
extern void recalc_sigpending(void);
|
|
|
|
extern void signal_wake_up(struct task_struct *t, int resume_stopped);
|
|
|
|
/*
|
|
* Wrappers for p->thread_info->cpu access. No-op on UP.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return p->thread_info->cpu;
|
|
}
|
|
|
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
p->thread_info->cpu = cpu;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
|
|
extern void arch_pick_mmap_layout(struct mm_struct *mm);
|
|
#else
|
|
static inline void arch_pick_mmap_layout(struct mm_struct *mm)
|
|
{
|
|
mm->mmap_base = TASK_UNMAPPED_BASE;
|
|
mm->get_unmapped_area = arch_get_unmapped_area;
|
|
mm->unmap_area = arch_unmap_area;
|
|
}
|
|
#endif
|
|
|
|
extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
|
|
extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
|
|
extern void normalize_rt_tasks(void);
|
|
|
|
#endif
|
|
|
|
/* try_to_freeze
|
|
*
|
|
* Checks whether we need to enter the refrigerator
|
|
* and returns 1 if we did so.
|
|
*/
|
|
#ifdef CONFIG_PM
|
|
extern void refrigerator(unsigned long);
|
|
extern int freeze_processes(void);
|
|
extern void thaw_processes(void);
|
|
|
|
static inline int try_to_freeze(unsigned long refrigerator_flags)
|
|
{
|
|
if (unlikely(current->flags & PF_FREEZE)) {
|
|
refrigerator(refrigerator_flags);
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline void refrigerator(unsigned long flag) {}
|
|
static inline int freeze_processes(void) { BUG(); return 0; }
|
|
static inline void thaw_processes(void) {}
|
|
|
|
static inline int try_to_freeze(unsigned long refrigerator_flags)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|