linux-kernel - Re: [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from

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Date:   Mon, 14 Nov 2016 09:52:29 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Tvrtko Ursulin <tursulin@...ulin.net>
Cc:     Intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Subject: Re: [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for
 userptr allocations

On Fri, Nov 11, 2016 at 12:36:13PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
> 
> With the addition of __sg_alloc_table_from_pages we can control
> the maximum coallescing size and eliminate a separate path for
> allocating backing store here.
> 
> Similar to 871dfbd67d4e ("drm/i915: Allow compaction upto
> SWIOTLB max segment size") this enables more compact sg lists to
> be created and so has a beneficial effect on workloads with many
> and/or large objects of this class.
> 
> v2:
>  * Rename helper to i915_sg_segment_size and fix swiotlb override.
>  * Commit message update.
> 
> v3:
>  * Actually include the swiotlb override fix.
> 
> v4:
>  * Regroup parameters a bit. (Chris Wilson)
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk> (v2)
(bump)
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre