From: Christoph Lameter <cl@linux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Swamy Gowda <swamy@virident.com>,
linux-kernel@vger.kernel.org, Brice.Goglin@inria.fr,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [RFC][PATCH] release mmap_sem before starting migration (Was Re: Need to take mmap_sem lock in move_pages.
Date: Wed, 4 Feb 2009 10:39:19 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.1.10.0902041037150.19633@qirst.com> (raw)
In-Reply-To: <20090204185501.837ff5d6.kamezawa.hiroyu@jp.fujitsu.com>
On Wed, 4 Feb 2009, KAMEZAWA Hiroyuki wrote:
> mmap_sem can be released after page table walk ends.
No. read lock on mmap_sem must be held since the migrate functions
manipulate page table entries. Concurrent large scale changes to the page
tables (splitting vmas, remapping etc) must not be possible.
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next prev parent reply other threads:[~2009-02-04 15:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <28631E6913C8074E95A698E8AC93D091B21561@caexch1.virident.info>
[not found] ` <20090204183600.f41e8b7e.kamezawa.hiroyu@jp.fujitsu.com>
[not found] ` <20090204184028.09a4bbae.kamezawa.hiroyu@jp.fujitsu.com>
2009-02-04 9:55 ` KAMEZAWA Hiroyuki
2009-02-04 15:39 ` Christoph Lameter [this message]
2009-02-05 1:15 ` KAMEZAWA Hiroyuki
2009-02-05 12:23 ` Swamy Gowda
2009-02-05 13:23 ` KAMEZAWA Hiroyuki
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