[Bug 72742] [ILK/HSW]igt/gem_tiled_swapping randomly causes OOM killer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72742

--- Comment #97 from Dave Hansen <dave at sr71.net> ---
(In reply to comment #95)
> (In reply to comment #94)
> > We died with over 1.3GiB of pending writeback which exceeds the amount of
> > memory we left spare during the test.
> 
> Do we need to resurrect the writeback harder hacks?

The problem isn't the number of writeback pages, the problem is that the pages
are not on a path to being freed.  Even with a large amount of writeback, the
VM will notice that _some_ of it is getting written out, and will resist OOMing
until progress stops being made.  The reason for the OOM here is that lack of
progress.  Waiting on writeback will, of course, reduce the number of pages
under writeback, but it just delays the inevitable when overall reclaim
progress isn't being made.

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