[Intel-gfx] [PATCH v3 5/6] drm/i915: Perform object clflushing asynchronously

[Joonas Lahtinen]

On ke, 2017-02-22 at 09:41 +0000, Chris Wilson wrote:
> Flushing the cachelines for an object is slow, can be as much as 100ms
> for a large framebuffer. We currently do this under the struct_mutex BKL
> on execution or on pageflip. But now with the ability to add fences to
> obj->resv for both flips and execbuf (and we naturally wait on the fence
> before CPU access), we can move the clflush operation to a workqueue and
> signal a fence for completion, thereby doing the work asynchronously and
> not blocking the driver or its clients.
> 
> v2: Introduce i915_gem_clflush.h and use a new name, split out some
> extras into separate patches.
> 
> Suggested-by: Akash Goel <akash.goel at intel.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Matthew Auld <matthew.auld at intel.com>

Reviewed-by: Joonas Lahtien <joonas.lahtinen at linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation