Quoting Joonas Lahtinen (2017-08-04 12:52:51)
> 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>
Thanks for the overnight testing, pushed.
-Chris
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