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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <50E4E989.5090202@redhat.com>
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>

-- 
All rights reversed
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/