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Commit 85ba2d86 authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
Browse files

tracehook: wait_task_inactive 



This extends wait_task_inactive() with a new argument so it can be used in
a "soft" mode where it will check for the task changing state unexpectedly
and back off.  There is no change to existing callers.  This lays the
groundwork to allow robust, noninvasive tracing that can try to sample a
blocked thread but back off safely if it wakes up.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1f5a4ad9

arch/ia64/kernel/perfmon.c

+2 −2
Original line number Diff line number Diff line
@@ -2626,7 +2626,7 @@ pfm_task_incompatible(pfm_context_t *ctx, struct task_struct *task) 
	/*

	 * make sure the task is off any CPU

	 */

	wait_task_inactive(task);

	wait_task_inactive(task, 0);



	/* more to come... */
@@ -4774,7 +4774,7 @@ pfm_check_task_state(pfm_context_t *ctx, int cmd, unsigned long flags) 


		UNPROTECT_CTX(ctx, flags);



		wait_task_inactive(task);

		wait_task_inactive(task, 0);



		PROTECT_CTX(ctx, flags);

include/linux/sched.h

+6 −2
Original line number Diff line number Diff line
@@ -1882,9 +1882,13 @@ extern void set_task_comm(struct task_struct *tsk, char *from); 
extern char *get_task_comm(char *to, struct task_struct *tsk);



#ifdef CONFIG_SMP

extern void wait_task_inactive(struct task_struct * p);

extern unsigned long wait_task_inactive(struct task_struct *, long match_state);

#else

#define wait_task_inactive(p)	do { } while (0)

static inline unsigned long wait_task_inactive(struct task_struct *p,

					       long match_state)

{

	return 1;

}

#endif



#define next_task(p)	list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)

kernel/kthread.c

+1 −1
Original line number Diff line number Diff line
@@ -176,7 +176,7 @@ void kthread_bind(struct task_struct *k, unsigned int cpu) 
		return;

	}

	/* Must have done schedule() in kthread() before we set_task_cpu */

	wait_task_inactive(k);

	wait_task_inactive(k, 0);

	set_task_cpu(k, cpu);

	k->cpus_allowed = cpumask_of_cpu(cpu);

	k->rt.nr_cpus_allowed = 1;

kernel/ptrace.c

+1 −1
Original line number Diff line number Diff line
@@ -107,7 +107,7 @@ int ptrace_check_attach(struct task_struct *child, int kill) 
	read_unlock(&tasklist_lock);



	if (!ret && !kill)

		wait_task_inactive(child);

		ret = wait_task_inactive(child, TASK_TRACED) ? 0 : -ESRCH;



	/* All systems go.. */

	return ret;

kernel/sched.c

+27 −2
Original line number Diff line number Diff line
@@ -1867,16 +1867,24 @@ migrate_task(struct task_struct *p, int dest_cpu, struct migration_req *req) 
/*

 * wait_task_inactive - wait for a thread to unschedule.

 *

 * If @match_state is nonzero, it's the @p->state value just checked and

 * not expected to change.  If it changes, i.e. @p might have woken up,

 * then return zero.  When we succeed in waiting for @p to be off its CPU,

 * we return a positive number (its total switch count).  If a second call

 * a short while later returns the same number, the caller can be sure that

 * @p has remained unscheduled the whole time.

 *

 * The caller must ensure that the task *will* unschedule sometime soon,

 * else this function might spin for a *long* time. This function can't

 * be called with interrupts off, or it may introduce deadlock with

 * smp_call_function() if an IPI is sent by the same process we are

 * waiting to become inactive.

 */

void wait_task_inactive(struct task_struct *p)

unsigned long wait_task_inactive(struct task_struct *p, long match_state)

{

	unsigned long flags;

	int running, on_rq;

	unsigned long ncsw;

	struct rq *rq;



	for (;;) {
@@ -1899,8 +1907,11 @@ void wait_task_inactive(struct task_struct *p) 
		 * return false if the runqueue has changed and p

		 * is actually now running somewhere else!

		 */

		while (task_running(rq, p))

		while (task_running(rq, p)) {

			if (match_state && unlikely(p->state != match_state))

				return 0;

			cpu_relax();

		}



		/*

		 * Ok, time to look more closely! We need the rq
@@ -1910,8 +1921,20 @@ void wait_task_inactive(struct task_struct *p) 
		rq = task_rq_lock(p, &flags);

		running = task_running(rq, p);

		on_rq = p->se.on_rq;

		ncsw = 0;

		if (!match_state || p->state == match_state) {

			ncsw = p->nivcsw + p->nvcsw;

			if (unlikely(!ncsw))

				ncsw = 1;

		}

		task_rq_unlock(rq, &flags);



		/*

		 * If it changed from the expected state, bail out now.

		 */

		if (unlikely(!ncsw))

			break;



		/*

		 * Was it really running after all now that we

		 * checked with the proper locks actually held?
@@ -1944,6 +1967,8 @@ void wait_task_inactive(struct task_struct *p) 
		 */

		break;

	}



	return ncsw;

}



/***