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Date:	Fri, 19 Sep 2014 09:29:19 -0400
From:	Johannes Weiner <>
Cc:	Michal Hocko <>, Greg Thelen <>,
	Dave Hansen <>,,
Subject: Re: [patch] mm: memcontrol: lockless page counters

Hi Dave,

this patch removes the lock you saw with will-it-scale/page_fault2
entirely, is there a chance you could give it a spin?  It's based on
v3.17-rc4-mmots-2014-09-12-17-13-4 and that memcg THP fix.  That
kernel also includes the recent root-memcg revert, so you'd have to
run it in a memcg; which is as easy as:

mkdir /sys/fs/cgroup/memory/foo
echo $$ >/sys/fs/cgroup/memory/foo/tasks
perf record -g -a ./ page_fault2

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