linux-kernel - Re: [PATCH 3/9] mm: introduce mm_populate() for populating new vmas

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Date:	Wed, 02 Jan 2013 21:14:33 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>, Jorn_Engel <joern@...fs.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] mm: introduce mm_populate() for populating new vmas

On 12/20/2012 07:49 PM, Michel Lespinasse wrote:
> When creating new mappings using the MAP_POPULATE / MAP_LOCKED flags
> (or with MCL_FUTURE in effect), we want to populate the pages within the
> newly created vmas. This may take a while as we may have to read pages
> from disk, so ideally we want to do this outside of the write-locked
> mmap_sem region.
>
> This change introduces mm_populate(), which is used to defer populating
> such mappings until after the mmap_sem write lock has been released.
> This is implemented as a generalization of the former do_mlock_pages(),
> which accomplished the same task but was using during mlock() / mlockall().
>
> Reported-by: Andy Lutomirski <luto@...capital.net>
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

Acked-by: Rik van Riel <riel@...hat.com>

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