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Commit dbf8eefa authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Paul Mackerras
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[POWERPC] spufs: don't yield CPU in spu_yield 



There is no reason to yield the CPU in spu_yield - if the backing
thread reenters spu_run it gets added to the end of the runqueue for
it's priority.  So the yield is just a slowdown for the case where
we have higher priority contexts waiting.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 28066ae9

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

+0 −4
Original line number Diff line number Diff line
@@ -438,7 +438,6 @@ void spu_deactivate(struct spu_context *ctx) 
void spu_yield(struct spu_context *ctx)

{

	struct spu *spu;

	int need_yield = 0;



	if (mutex_trylock(&ctx->state_mutex)) {

		if ((spu = ctx->spu) != NULL) {
@@ -447,13 +446,10 @@ void spu_yield(struct spu_context *ctx) 
				pr_debug("%s: yielding SPU %d NODE %d\n",

					 __FUNCTION__, spu->number, spu->node);

				spu_deactivate(ctx);

				need_yield = 1;

			}

		}

		mutex_unlock(&ctx->state_mutex);

	}

	if (unlikely(need_yield))

		yield();

}



int __init spu_sched_init(void)