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[POWERPC] spu sched: ensure preempted threads are put back on the runqueue 

To not lose a spu thread we need to make sure it always gets put back
on the runqueue.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
This commit is contained in:
Christoph Hellwig 2007-04-23 21:08:08 +02:00 committed by Arnd Bergmann
parent 43c2bbd932
commit b3e76cc324
1 changed files with 10 additions and 3 deletions
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13
arch/powerpc/platforms/cell/spufs/sched.c
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@ -97,7 +97,7 @@ void spu_sched_tick(struct work_struct *work)
struct spu_context *ctx =
container_of(work, struct spu_context, sched_work.work);
struct spu *spu;
int rearm = 1;
int preempted = 0;
/*
* If this context is being stopped avoid rescheduling from the
@ -113,12 +113,19 @@ void spu_sched_tick(struct work_struct *work)
int best = sched_find_first_bit(spu_prio->bitmap);
if (best <= ctx->prio) {
spu_deactivate(ctx);
rearm = 0;
preempted = 1;
}
}
mutex_unlock(&ctx->state_mutex);
if (rearm)
if (preempted) {
/*
* We need to break out of the wait loop in spu_run manually
* to ensure this context gets put on the runqueue again
* ASAP.
*/
wake_up(&ctx->stop_wq);
} else
spu_start_tick(ctx);
}