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Commit c77239b8 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Paul Mackerras
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[POWERPC] spusched: Disable tick when not needed 



Only enable the scheduler tick if we have any context waiting to be
scheduled.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJeremy Kerr <jk@ozlabs.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 08c9692b

arch/powerpc/platforms/cell/spufs/sched.c

+10 −8
Original line number Diff line number Diff line
@@ -294,9 +294,10 @@ static void __spu_add_to_rq(struct spu_context *ctx) 
{

	int prio = ctx->prio;



	spu_prio->nr_waiting++;

	list_add_tail(&ctx->rq, &spu_prio->runq[prio]);

	set_bit(prio, spu_prio->bitmap);

	if (!spu_prio->nr_waiting++)

		__mod_timer(&spusched_timer, jiffies + SPUSCHED_TICK);

}



static void __spu_del_from_rq(struct spu_context *ctx)
@@ -304,12 +305,14 @@ static void __spu_del_from_rq(struct spu_context *ctx) 
	int prio = ctx->prio;



	if (!list_empty(&ctx->rq)) {

		if (!--spu_prio->nr_waiting)

			del_timer(&spusched_timer);

		list_del_init(&ctx->rq);

		spu_prio->nr_waiting--;

	}



		if (list_empty(&spu_prio->runq[prio]))

			clear_bit(prio, spu_prio->bitmap);

	}

}



static void spu_prio_wait(struct spu_context *ctx)

{
@@ -654,9 +657,6 @@ static int spusched_thread(void *unused) 
	struct spu *spu, *next;

	int node;



	setup_timer(&spusched_timer, spusched_wake, 0);

	__mod_timer(&spusched_timer, jiffies + SPUSCHED_TICK);



	while (!kthread_should_stop()) {

		set_current_state(TASK_INTERRUPTIBLE);

		schedule();
@@ -670,7 +670,6 @@ static int spusched_thread(void *unused) 
		}

	}



	del_timer_sync(&spusched_timer);

	return 0;

}
@@ -732,6 +731,8 @@ int __init spu_sched_init(void) 
	}

	spin_lock_init(&spu_prio->runq_lock);



	setup_timer(&spusched_timer, spusched_wake, 0);



	spusched_task = kthread_run(spusched_thread, NULL, "spusched");

	if (IS_ERR(spusched_task)) {

		err = PTR_ERR(spusched_task);
@@ -762,6 +763,7 @@ void __exit spu_sched_exit(void) 


	remove_proc_entry("spu_loadavg", NULL);



	del_timer_sync(&spusched_timer);

	kthread_stop(spusched_task);



	for (node = 0; node < MAX_NUMNODES; node++) {