linux-kernel - Re: [PATCH -mm V2] do_migrate_pages() calls migrate_to_node() even if task is already on a correct node

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: <alpine.DEB.2.00.1204241106240.26005@router.home>
Date:	Tue, 24 Apr 2012 11:08:25 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Larry Woodman <lwoodman@...hat.com>
cc:	linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Motohiro Kosaki <mkosaki@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -mm V2] do_migrate_pages() calls migrate_to_node() even
 if task is already on a correct node

On Tue, 24 Apr 2012, Larry Woodman wrote:

> While moving tasks between cpusets we noticed some strange behavior.
> Specifically if the nodes of the destination
> cpuset are a subset of the nodes of the source cpuset do_migrate_pages() will
> move pages that are already on a node
> in the destination cpuset.  The reason for this is do_migrate_pages() does not
> check whether each node in the source
> nodemask is in the destination nodemask before calling migrate_to_node().  If
> we simply do this check and skip them
> when the source is in the destination moving we wont move nodes that dont need
> to be moved.

Acked-by: Christoph Lameter <cl@...ux.com>
--
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/