linux-kernel - Re: Need to take mmap_sem lock in move

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Message-ID: <alpine.DEB.1.10.0902041033370.19633@qirst.com>
Date:	Wed, 4 Feb 2009 10:34:13 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Swamy Gowda <swamy@...ident.com>, linux-kernel@...r.kernel.org,
	Brice.Goglin@...ia.fr
Subject: Re: Need to take mmap_sem lock in move_pages.

On Wed, 4 Feb 2009, KAMEZAWA Hiroyuki wrote:

> >  1. do_move_page_to_node_array() at el. needs mmap_sem (read-side) because it
> >     scans page table and vma. While we have to scan vmas to find pages for
> >     migration, it needs mmap_sem.

Right.

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