linux-kernel - Re: [PATCH v8 01/16] dma-buf/dma-fence: Add deadline awareness

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Date:   Wed, 1 Mar 2023 15:28:02 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Christian König <ckoenig.leichtzumerken@...il.com>,
        Michel Dänzer <michel@...nzer.net>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Alex Deucher <alexander.deucher@....com>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Simon Ser <contact@...rsion.fr>,
        Luben Tuikov <luben.tuikov@....com>,
        Rob Clark <robdclark@...omium.org>,
        Christian König <christian.koenig@....com>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Gustavo Padovan <gustavo@...ovan.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 01/16] dma-buf/dma-fence: Add deadline awareness

On 3/1/23 05:58, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Add a way to hint to the fence signaler of an upcoming deadline, such as
> vblank, which the fence waiter would prefer not to miss.  This is to aid
> the fence signaler in making power management decisions, like boosting
> frequency as the deadline approaches and awareness of missing deadlines
> so that can be factored in to the frequency scaling.
> 
> v2: Drop dma_fence::deadline and related logic to filter duplicate
>     deadlines, to avoid increasing dma_fence size.  The fence-context
>     implementation will need similar logic to track deadlines of all
>     the fences on the same timeline.  [ckoenig]
> v3: Clarify locking wrt. set_deadline callback
> v4: Clarify in docs comment that this is a hint
> v5: Drop DMA_FENCE_FLAG_HAS_DEADLINE_BIT.
> v6: More docs
> v7: Fix typo, clarify past deadlines
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> Reviewed-by: Christian König <christian.koenig@....com>
> Acked-by: Pekka Paalanen <pekka.paalanen@...labora.com>

I have given my Reviewed-by from v7 [1], but it didn't get picked up,
thus giving it again:

Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com>

Thanks.

[1]: https://lore.kernel.org/linux-doc/Y%2F7LfLxhIjDpD4D3@debian.me/

-- 
An old man doll... just what I always wanted! - Clara