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

From: Rik van Riel
Date: Wed Jan 02 2013 - 21:14:34 EST

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@xxxxxxxxxxxxxx>
Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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