[Intel-gfx] [PATCH 1/3] drm/i915: Allow kswapd to pause the device whilst reaping

[Joonas Lahtinen]

On to, 2017-06-01 at 14:33 +0100, Chris Wilson wrote:
> In commit 5763ff04dc4e ("drm/i915: Avoid GPU stalls from kswapd") we
> stopped direct reclaim and kswapd from triggering GPU/client stalls
> whilst running (by restricting the objects they could reap to be idle).
> 
> However with abusive GPU usage, it becomes quite easy to starve kswapd
> of memory and prevent it from making forward progress towards obtaining
> enough free memory (thus driving the system closer to swap exhaustion).
> Relax the previous restriction to allow kswapd (but not direct reclaim)
> to stall the device whilst reaping purgeable pages.
> 
> v2: Also acquire the rpm wakelock to allow kswapd to unbind buffers.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

These are the kind of patches one wishes we had good testing coverage.

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

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