From: Gustavo Padovan <gustavo@padovan.org>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: dri-devel@lists.freedesktop.org,
Sumit Semwal <sumit.semwal@linaro.org>,
linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org
Subject: Re: [PATCH] dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0)
Date: Mon, 29 Aug 2016 14:26:16 -0400 [thread overview]
Message-ID: <20160829182616.GG23577@joana> (raw)
In-Reply-To: <20160829181613.30722-1-chris@chris-wilson.co.uk>
Hi Chris,
2016-08-29 Chris Wilson <chris@chris-wilson.co.uk>:
> If we being polled with a timeout of zero, a nonblocking busy query,
> we don't need to install any fence callbacks as we will not be waiting.
> As we only install the callback once, the overhead comes from the atomic
> bit test that also causes serialisation between threads.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Sumit Semwal <sumit.semwal@linaro.org>
> Cc: Gustavo Padovan <gustavo@padovan.org>
> Cc: linux-media@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: linaro-mm-sig@lists.linaro.org
> ---
> drivers/dma-buf/sync_file.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
Indeed, we can shortcut this.
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Gustavo
next prev parent reply other threads:[~2016-08-29 18:26 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-29 7:08 [PATCH 01/11] drm/amdgpu: Remove call to reservation_object_test_signaled_rcu before wait Chris Wilson
2016-08-29 7:08 ` [PATCH 02/11] drm/etnaviv: Remove manual " Chris Wilson
2016-09-23 12:55 ` Daniel Vetter
2016-10-05 16:15 ` Sumit Semwal
2016-10-10 13:17 ` Lucas Stach
2016-08-29 7:08 ` [PATCH 03/11] drm/msm: Remove " Chris Wilson
2016-09-23 12:55 ` Daniel Vetter
2016-09-23 13:07 ` [Intel-gfx] " Rob Clark
2016-08-29 7:08 ` [PATCH 04/11] drm/nouveau: " Chris Wilson
2016-09-23 12:55 ` Daniel Vetter
2016-10-05 16:05 ` Sumit Semwal
2016-08-29 7:08 ` [PATCH 05/11] drm/vmwgfx: " Chris Wilson
2016-09-23 12:56 ` Daniel Vetter
2016-10-05 16:11 ` [Intel-gfx] " Sumit Semwal
2016-10-05 17:03 ` Sinclair Yeh
2016-08-29 7:08 ` [PATCH 06/11] dma-buf: Introduce fence_get_rcu_safe() Chris Wilson
2016-09-23 12:59 ` Daniel Vetter
2016-09-23 13:34 ` Markus Heiser
2016-08-29 7:08 ` [PATCH 07/11] dma-buf: Restart reservation_object_get_fences_rcu() after writes Chris Wilson
2016-09-23 13:03 ` Daniel Vetter
2016-08-29 7:08 ` [PATCH 08/11] dma-buf: Restart reservation_object_wait_timeout_rcu() " Chris Wilson
2016-09-23 13:18 ` Daniel Vetter
2016-08-29 7:08 ` [PATCH 09/11] dma-buf: Restart reservation_object_test_signaled_rcu() " Chris Wilson
2016-09-23 13:43 ` Daniel Vetter
2016-08-29 7:08 ` [PATCH 10/11] dma-buf: Use seqlock to close RCU race in test_signaled_single Chris Wilson
2016-09-23 13:49 ` [Linaro-mm-sig] " Daniel Vetter
2016-09-23 14:02 ` Chris Wilson
2016-09-25 20:43 ` Daniel Vetter
2016-08-29 7:08 ` [PATCH 11/11] dma-buf: Do a fast lockless check for poll with timeout=0 Chris Wilson
2016-08-29 18:16 ` [PATCH] dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0) Chris Wilson
2016-08-29 18:26 ` Gustavo Padovan [this message]
2016-09-13 14:46 ` Sumit Semwal
2016-09-15 0:00 ` Rafael Antognolli
2016-09-21 7:26 ` Gustavo Padovan
2016-09-21 11:08 ` Chris Wilson
2016-09-23 13:50 ` [Intel-gfx] [PATCH 11/11] dma-buf: Do a fast lockless check for poll with timeout=0 Daniel Vetter
2016-09-23 14:15 ` Chris Wilson
2016-09-23 15:06 ` Chris Wilson
2016-09-23 15:20 ` [Intel-gfx] " Chris Wilson
2016-09-23 17:59 ` Christian König
2016-09-25 20:44 ` Daniel Vetter
2016-08-29 8:20 ` [PATCH 01/11] drm/amdgpu: Remove call to reservation_object_test_signaled_rcu before wait Christian König
2016-09-23 12:54 ` Daniel Vetter
2016-10-05 16:03 ` Sumit Semwal
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