linux-kernel - Re: [patch 3.5-rc3] mm, mempolicy: fix mbind() to do synchronous migration

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]

Date:	Thu, 21 Jun 2012 16:46:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 3.5-rc3] mm, mempolicy: fix mbind() to do synchronous
 migration

On Wed, 20 Jun 2012 18:00:12 -0700 (PDT)
David Rientjes <rientjes@...gle.com> wrote:

> If the range passed to mbind() is not allocated on nodes set in the
> nodemask, it migrates the pages to respect the constraint.
> 
> The final formal of migrate_pages() is a mode of type enum migrate_mode,
> not a boolean.  do_mbind() is currently passing "true" which is the
> equivalent of MIGRATE_SYNC_LIGHT.  This should instead be MIGRATE_SYNC
> for synchronous page migration.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  mm/mempolicy.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -1177,7 +1177,7 @@ static long do_mbind(unsigned long start, unsigned long len,
>  		if (!list_empty(&pagelist)) {
>  			nr_failed = migrate_pages(&pagelist, new_vma_page,
>  						(unsigned long)vma,
> -						false, true);
> +						false, MIGRATE_SYNC);
>  			if (nr_failed)
>  				putback_lru_pages(&pagelist);
>  		}

I can't really do anything with this patch - it's a bug added by
Peter's "mm/mpol: Simplify do_mbind()" and added to linux-next via one
of Ingo's trees.

And I can't cleanly take the patch over as it's all bound up with the
other changes for sched/numa balancing.

Is that patchset actually going anywhere in the short term in its
present form?  If not, methinks it would be better to pull it out of
-next for now.

--
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/