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

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Message-ID: <1338303251.26856.94.camel@twins>
Date:	Tue, 29 May 2012 16:54:11 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Rik van Riel <riel@...hat.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	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 Tue, 2012-05-29 at 09:56 -0400, Rik van Riel wrote:
> On 05/29/2012 09:16 AM, Peter Zijlstra wrote:
> > On Fri, 2012-05-25 at 19:02 +0200, Andrea Arcangeli wrote:
> 
> > 24 bytes per page.. or ~0.6% of memory gone. This is far too great a
> > price to pay.
> >
> > At LSF/MM Rik already suggested you limit the number of pages that can
> > be migrated concurrently and use this to move the extra list_head out of
> > struct page and into a smaller amount of extra structures, reducing the
> > total overhead.
> 
> For THP, we should be able to track this NUMA info on a
> 2MB page granularity.

Yeah, but that's another x86-only feature, _IF_ we're going to do this
it must be done for all archs that have CONFIG_NUMA, thus we're stuck
with 4k (or other base page size).
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