From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx145.postini.com [74.125.245.145]) by kanga.kvack.org (Postfix) with SMTP id 15CCE6B0069 for ; Thu, 20 Sep 2012 14:54:38 -0400 (EDT) Message-ID: <505B6669.2040104@redhat.com> Date: Thu, 20 Sep 2012 14:54:33 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible References: <1348149875-29678-1-git-send-email-mgorman@suse.de> <1348149875-29678-4-git-send-email-mgorman@suse.de> In-Reply-To: <1348149875-29678-4-git-send-email-mgorman@suse.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Richard Davies , Shaohua Li , Avi Kivity , QEMU-devel , KVM , Linux-MM , LKML On 09/20/2012 10:04 AM, Mel Gorman wrote: > Compactions free scanner acquires the zone->lock when checking for PageBuddy > pages and isolating them. It does this even if there are no PageBuddy pages > in the range. > > This patch defers acquiring the zone lock for as long as possible. In the > event there are no free pages in the pageblock then the lock will not be > acquired at all which reduces contention on zone->lock. > > Signed-off-by: Mel Gorman Acked-by: Rik van Riel -- 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/ . Don't email: email@kvack.org