Re: [PATCH] dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0)

Hi Chris, On 29 August 2016 at 23:56, Gustavo Padovan wrote: > Hi Chris, > > 2016-08-29 Chris Wilson : > >> 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

Re: [PATCH] dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0)

Hi Chris, 2016-08-29 Chris Wilson : > 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

[PATCH] dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0)

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