From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with ESMTP id 05EFA6B0012 for ; Mon, 30 May 2011 10:50:59 -0400 (EDT) Date: Mon, 30 May 2011 22:45:02 +0800 From: Greg KH Subject: Re: [stable] [PATCH] mm: compaction: Abort compaction if too many pages are isolated and caller is asynchronous Message-ID: <20110530144502.GA2689@kroah.com> References: <20110530131300.GQ5044@csn.ul.ie> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110530131300.GQ5044@csn.ul.ie> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: akpm@linux-foundation.org, Andrea Arcangeli , linux-kernel@vger.kernel.org, linux-mm@kvack.org, KOSAKI Motohiro , Ury Stankevich , stable@kernel.org On Mon, May 30, 2011 at 02:13:00PM +0100, Mel Gorman wrote: > Asynchronous compaction is used when promoting to huge pages. This is > all very nice but if there are a number of processes in compacting > memory, a large number of pages can be isolated. An "asynchronous" > process can stall for long periods of time as a result with a user > reporting that firefox can stall for 10s of seconds. This patch aborts > asynchronous compaction if too many pages are isolated as it's better to > fail a hugepage promotion than stall a process. > > If accepted, this should also be considered for 2.6.39-stable. It should > also be considered for 2.6.38-stable but ideally [11bc82d6: mm: > compaction: Use async migration for __GFP_NO_KSWAPD and enforce no > writeback] would be applied to 2.6.38 before consideration. > > Reported-and-Tested-by: Ury Stankevich > Signed-off-by: Mel Gorman > --- > mm/compaction.c | 32 ++++++++++++++++++++++++++------ > 1 files changed, 26 insertions(+), 6 deletions(-) This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read Documentation/stable_kernel_rules.txt for how to do this properly. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org