linux-kernel - Re: [patch] mm: memcontrol: lockless page counters

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Message-ID: <20140919132919.GA16184@cmpxchg.org>
Date:	Fri, 19 Sep 2014 09:29:19 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	linux-mm@...ck.org
Cc:	Michal Hocko <mhocko@...e.cz>, Greg Thelen <gthelen@...gle.com>,
	Dave Hansen <dave@...1.net>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
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 ./runtest.py page_fault2

Thanks!
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