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| author | Andres Rodriguez <andresx7@gmail.com> | 2017-04-26 10:46:20 -0400 |
|---|---|---|
| committer | Gustavo Padovan <gustavo.padovan@collabora.com> | 2017-04-27 16:56:10 -0300 |
| commit | 03c0c5f6641533f5fc14bf4e76d2304197402552 (patch) | |
| tree | 6e91e365052b25c6d051dfaedc8deb971b06d0ad /drivers/dma-buf | |
| parent | 459b086d878b855a7d09a074cf0dbd0717dc50ec (diff) | |
| download | linux-03c0c5f6641533f5fc14bf4e76d2304197402552.tar.gz linux-03c0c5f6641533f5fc14bf4e76d2304197402552.tar.bz2 linux-03c0c5f6641533f5fc14bf4e76d2304197402552.zip | |
dma-buf: avoid scheduling on fence status query v2
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>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170426144620.3560-1-andresx7@gmail.com
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/dma-fence.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 0918d3f003d6..57da14c15987 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -402,6 +402,11 @@ dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout) } } + if (!timeout) { + ret = 0; + goto out; + } + cb.base.func = dma_fence_default_wait_cb; cb.task = current; list_add(&cb.base.node, &fence->cb_list); |