linux-kernel - Re: [PATCH 13/35] autonuma: add page structure fields

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Date:	Tue, 29 May 2012 12:46:09 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 13/35] autonuma: add page structure fields

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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