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Date: Tue, 29 May 2012 12:46:09 -0400
From: Rik van Riel <riel@redhat.com>
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Subject: Re: [PATCH 13/35] autonuma: add page structure fields
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To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, 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 05/29/2012 12:38 PM, Andrea Arcangeli wrote:
> On Tue, May 29, 2012 at 03:16:25PM +0200, Peter Zijlstra wrote:
>> 24 bytes per page.. or ~0.6% of memory gone. This is far too great a
>> price to pay.
>
> I don't think it's too great, memcg uses for half of that and yet
> nobody is booting with cgroup_disable=memory even on not-NUMA servers
> with less RAM.

Not any more.

Ever since the memcg naturalization work by Johannes,
a page is only ever on one LRU list and the memcg
memory overhead is gone.

> But I'm all for experimenting. It's just not something I had the time
> to try yet. I will certainly love to see how it performs by reducing
> the max size of the list. I totally agree it's a good idea to try it
> out, and I don't exclude it will work fine, but it's not obvious it's
> worth the memory saving.

That's fair enough.

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