[Intel-gfx] [PATCH] drm/i915: Break long iterations for get/put shmemfs pages

[Joonas Lahtinen]

Quoting Chris Wilson (2018-11-05 19:06:40)
> As we may have to iterate a few thousand elements to acquire and release
> the shmemfs backing storage for a GPU object, we need to break up the
> long loop with cond_resched() to retain a modicum of low latency for
> other processes.
> 
> Testcase: igt/benchmarks/gem_syslatency
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Kuo-Hsin Yang <vovoy at chromium.org>
> Cc: Matthew Auld <matthew.auld at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

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

Regards, Joonas