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.
next prev parent reply other threads:[~2009-02-04 15:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <28631E6913C8074E95A698E8AC93D091B21561@caexch1.virident.info>
2009-02-04 9:36 ` KAMEZAWA Hiroyuki
2009-02-04 9:40 ` KAMEZAWA Hiroyuki
2009-02-04 9:55 ` [RFC][PATCH] release mmap_sem before starting migration (Was " 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
2009-02-04 15:34 ` Christoph Lameter
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