linux-kernel - Re: [PATCH 4/9] mm: compaction: Abort compaction loop if lock is contended or run too long

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: <20120921175026.GD6665@optiplex.redhat.com>
Date:	Fri, 21 Sep 2012 14:50:27 -0300
From:	Rafael Aquini <aquini@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Davies <richard@...chsys.com>,
	Shaohua Li <shli@...nel.org>, Rik van Riel <riel@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	QEMU-devel <qemu-devel@...gnu.org>, KVM <kvm@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] mm: compaction: Abort compaction loop if lock is
 contended or run too long

On Fri, Sep 21, 2012 at 11:46:18AM +0100, Mel Gorman wrote:
> From: Shaohua Li <shli@...ionio.com>
> 
> Changelog since V2
> o Fix BUG_ON triggered due to pages left on cc.migratepages
> o Make compact_zone_order() require non-NULL arg `contended'
> 
> Changelog since V1
> o only abort the compaction if lock is contended or run too long
> o Rearranged the code by Andrea Arcangeli.
> 
> isolate_migratepages_range() might isolate no pages if for example when
> zone->lru_lock is contended and running asynchronous compaction. In this
> case, we should abort compaction, otherwise, compact_zone will run a
> useless loop and make zone->lru_lock is even contended.
> 
> [minchan@...nel.org: Putback pages isolated for migration if aborting]
> [akpm@...ux-foundation.org: compact_zone_order requires non-NULL arg contended]
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Shaohua Li <shli@...ionio.com>
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Acked-by: Rik van Riel <riel@...hat.com>
> ---

Acked-by: Rafael Aquini <aquini@...hat.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/