[PATCH] drm/gem: Mark pinned pages as unevictable

[Chris Wilson]

Quoting Kuo-Hsin Yang (2018-12-14 09:33:19)
> On Fri, Dec 14, 2018 at 4:59 PM Chris Wilson <chris at chris-wilson.co.uk> wrote:
> >
> >
> > Do you have a driver in mind (msm?) to demonstrate the use case?
> 
> On Samsung Chromebook Plus, the drm/rockchip driver may call
> rockchip_gem_get_pages()/drm_gem_get_pages() to pin a lot of pages,
> breaking the page reclaim mechanism and causing oom-killer invocation.

Hmm, but this doesn't change the unavailability of the pages, just how
much work the shrinker must do scanning the evictable lists containing
GEM pages to no avail. So it won't prevent an oom by itself because
rockchip will still be holding the pages.

Or?
-Chris