From: Christoph Lameter <clameter@engr.sgi.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: linux-mm@kvack.org, lhms-devel@lists.sourceforge.net,
jschopp@austin.ibm.com, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH 0/2] Page migration via Swap V2: Overview
Date: Tue, 18 Oct 2005 09:50:45 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.62.0510180948490.7911@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <43549815.9090001@jp.fujitsu.com>
On Tue, 18 Oct 2005, KAMEZAWA Hiroyuki wrote:
> Because sys_mbind() acquires mm->mmap_sem, once page is unmapped,
> all accesses to the page are blocked.
>
> So, even if the range contains hot pages, there will not be
> hard-to-be-swapped-out pages. right ?
There may be locked pages and maybe pages that are continually busy.
> sys_mbind() can aquire mm->mmap_sem for migrating *a process's page*,
> but memory-hotplug cannot aquire the lock for migrating a chunk of pages.
I did mbind first because it is the less invasive. The primary reason to
acquire mmap_sem is to be able to walk the vma areas.
> I think we'll need radix_tree_replace for migating arbitrary chunk of pages,
> anyway.
Likely. Ultimately I would like to see the direct migration work.
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next prev parent reply other threads:[~2005-10-18 16:50 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-18 0:49 Christoph Lameter
2005-10-18 0:49 ` [PATCH 1/2] Page migration via Swap V2: Page Eviction Christoph Lameter
2005-10-18 1:04 ` Andrew Morton
2005-10-18 8:51 ` Nick Piggin
2005-10-18 16:38 ` Christoph Lameter
2005-10-18 8:34 ` Magnus Damm
2005-10-18 16:43 ` Christoph Lameter
2005-10-19 10:04 ` Magnus Damm
2005-10-19 15:29 ` Christoph Lameter
2005-10-19 20:32 ` Christoph Lameter
2005-10-18 0:49 ` [PATCH 2/2] Page migration via Swap V2: MPOL_MF_MOVE interface Christoph Lameter
2005-10-18 10:05 ` Magnus Damm
2005-10-18 16:46 ` Christoph Lameter
2005-10-18 3:18 ` [PATCH 0/2] Page migration via Swap V2: Overview KAMEZAWA Hiroyuki
2005-10-18 14:27 ` [Lhms-devel] " Lee Schermerhorn
2005-10-18 16:47 ` Christoph Lameter
2005-10-18 6:37 ` KAMEZAWA Hiroyuki
2005-10-18 16:50 ` Christoph Lameter [this message]
2005-10-18 12:16 ` Marcelo Tosatti
2005-10-18 16:54 ` Christoph Lameter
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