On pe, 2017-08-04 at 11:41 +0100, Chris Wilson wrote:
> In order for us to successfully detect the end of a timeslice,
> preemption must be disabled. Otherwise, inside the loop we may be
> preempted many times without our noticing, and each time our timeslice
> will be reset, invalidating need_resched()
>
> Reported-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Reported-by: Tomi Sarvela <tomi.p.sarvela@xxxxxxxxx>
> Fixes: 290271de34f6 ("drm/i915: Spin for struct_mutex inside shrinker")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: <drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx> # v4.13-rc1+
Gets rid of the hang for my BDW.
Tested-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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