Re: [Linaro-mm-sig] [PATCH] dma-buf: avoid scheduling on fence status query v2

2017-04-26 Christian König deathsimple@vodafone.de:

Am 26.04.2017 um 16:46 schrieb Andres Rodriguez:

...

When a timeout of zero is specified, the caller is only interested in the fence status.

In the current implementation, dma_fence_default_wait will always call schedule_timeout() at least once for an unsignaled fence. This adds a significant overhead to a fence status query.

Avoid this overhead by returning early if a zero timeout is specified.

v2: move early return after enable_signaling

Signed-off-by: Andres Rodriguez andresx7@gmail.com

Reviewed-by: Christian König christian.koenig@amd.com

pushed to drm-misc-next. Thanks all.

Gustavo