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Subject: Re: [PATCH 13/35] autonuma: add page structure fields
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 29 May 2012 18:56:53 +0200
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To: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Hillf Danton <dhillf@gmail.com>, Dan Smith <danms@us.ibm.com>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, Paul Turner <pjt@google.com>, Suresh Siddha <suresh.b.siddha@intel.com>, Mike Galbraith <efault@gmx.de>, "Paul E.
 McKenney" <paulmck@linux.vnet.ibm.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Bharata B Rao <bharata.rao@gmail.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Johannes Weiner <hannes@cmpxchg.org>, Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>, Christoph Lameter <cl@linux.com>

On Tue, 2012-05-29 at 12:46 -0400, Rik van Riel wrote:
> > I don't think it's too great, memcg uses for half of that and yet
> > nobody is booting with cgroup_disable=3Dmemory even on not-NUMA servers
> > with less RAM.

Right, it was such a hit we had to disable that by default on RHEL6.

> Not any more.=20

Right, hnaz did great work there, but wasn't there still some few pieces
of the shadow page frame left? ISTR LSF/MM talk of moving the last few
bits into the regular page frame, taking the word that became available
through: fc9bb8c768 ("mm: Rearrange struct page").


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