On Wed, Dec 21, 2016 at 12:16:53PM +0100, Michal Hocko wrote:
On Wed 21-12-16 20:00:38, Tetsuo Handa wrote:
One thing to note here, when we are talking about 32b kernel, things
have changed in 4.8 when we moved from the zone based to node based
reclaim (see b2e18757f2c9 ("mm, vmscan: begin reclaiming pages on a
per-node basis") and associated patches). It is possible that the
reporter is hitting some pathological path which needs fixing but it
might be also related to something else. So I am rather not trying to
blame 32b yet...
It might be interesting to put tracing on releasepage and see if btrfs
is pinning pages around. I can't see how 32bit kernels would be
different, but maybe we're hitting a weird corner.
-chris
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