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authorChristoph Hellwig <hch@lst.de>2007-04-23 21:08:08 +0200
committerArnd Bergmann <arnd@klappe.arndb.de>2007-04-23 21:18:53 +0200
commitb3e76cc3244ac139fc75750c5af9edbb9f191a10 (patch)
treee4d743216dceb19155ea0f374ee445e9a6a8a7e7 /arch/powerpc/platforms/cell/spufs/sched.c
parent43c2bbd932b66403688f3d812065d82f8fb8f4b3 (diff)
[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>
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/sched.c')
-rw-r--r--arch/powerpc/platforms/cell/spufs/sched.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 003e330fc76f..5149dff65c9e 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -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);
}

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