linux-kernel - Re: [PATCH 05/40] autonuma: define _PAGE_NUMA_PTE and _PAGE_NUMA

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Date:	Tue, 3 Jul 2012 22:30:32 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 05/40] autonuma: define _PAGE_NUMA_PTE and _PAGE_NUMA_PMD

Hi Rik,

On Fri, Jun 29, 2012 at 10:26:39AM -0400, Rik van Riel wrote:
> On 06/28/2012 08:55 AM, Andrea Arcangeli wrote:
> 
> > +/*
> > + * Cannot be set on pte. The fact it's in between _PAGE_FILE and
> > + * _PAGE_PROTNONE avoids having to alter the swp entries.
> > + */
> > +#define _PAGE_NUMA_PTE	_PAGE_PSE
> > +/*
> > + * Cannot be set on pmd, if transparent hugepages will be swapped out
> > + * the swap entry offset must start above it.
> > + */
> > +#define _PAGE_NUMA_PMD	_PAGE_UNUSED2
> 
> Those comments only tell us what the flags can NOT be
> used for, not what they are actually used for.

You can find an updated version of the comments here:

http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git;a=commitdiff;h=927ca960d78fefe6fa6aaa260a5b35496abafec5

Thanks for all the feedback, I didn't reply immediately but I'm
handling all the feedback and many more bits have been improved
already in the autonuma branch. I will post them separately for
further review.
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