From: Christoph Lameter <cl@linux-foundation.org>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Bob Liu <lliubbo@gmail.com>,
akpm@linux-foundation.org, linux-mm@kvack.org,
lee.schermerhorn@hp.com, andi@firstfloor.org,
minchar.kim@gmail.com
Subject: Re: [RFC][PATCH] migrate_pages:skip migration between intersect nodes
Date: Tue, 30 Mar 2010 11:29:33 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1003301128320.24266@router.home> (raw)
In-Reply-To: <28c262361003291703i5382e342q773ffb16e3324cf5@mail.gmail.com>
On Tue, 30 Mar 2010, Minchan Kim wrote:
> Hi, Bob
>
> On Mon, Mar 29, 2010 at 11:57 PM, Bob Liu <lliubbo@gmail.com> wrote:
> > In current do_migrate_pages(),if from_nodes and to_nodes have some
> > intersect nodes,pages in these intersect nodes will also be
> > migrated.
> > eg. Assume that, from_nodes: 1,2,3,4 to_nodes: 2,3,4,5. Then these
> > migrates will happen:
> > migrate_pages(4,5);
> > migrate_pages(3,4);
> > migrate_pages(2,3);
> > migrate_pages(1,2);
> >
> > But the user just want all pages in from_nodes move to to_nodes,
> > only migrate(1,2)(ignore the intersect nodes.) can satisfied
> > the user's request.
> >
> > I amn't sure what's migrate_page's semantic.
> > Hoping for your suggestions.
>
> I didn't see 8:migratepages Lee pointed at that time.
> The description matches current migrate_pages's behavior exactly.
>
> I agree Lee's opinion.
> Let's wait Christoph's reply what is semantic
> and why it doesn't have man page.
Manpage is part of numatools.
The intended semantic is the preservation of the relative position of the
page to the beginning of the node set. If you do not want to preserve the
relative position then just move portions of the nodes around.
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next prev parent reply other threads:[~2010-03-30 16:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-29 14:57 [RFC][PATCH] migrate_pages:skip migration between intersect nodes Bob Liu
2010-03-29 15:31 ` Lee Schermerhorn
2010-03-29 23:41 ` KOSAKI Motohiro
2010-03-30 16:28 ` Christoph Lameter
2010-03-30 16:49 ` Andi Kleen
2010-03-30 0:03 ` Minchan Kim
2010-03-30 16:29 ` Christoph Lameter [this message]
2010-03-31 1:36 ` Bob Liu
2010-03-31 3:56 ` Minchan Kim
2010-03-31 4:02 ` Bob Liu
2010-03-31 14:17 ` Christoph Lameter
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