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 SMTP id 742466B00BC for ; Wed, 29 Jul 2009 21:40:22 -0400 (EDT) Message-ID: <4A70F9E9.5000007@redhat.com> Date: Wed, 29 Jul 2009 21:39:53 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation falling back to other migratetypes References: <1248901551-7072-1-git-send-email-mel@csn.ul.ie> <1248901551-7072-3-git-send-email-mel@csn.ul.ie> In-Reply-To: <1248901551-7072-3-git-send-email-mel@csn.ul.ie> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: Larry Woodman , Ingo Molnar , Peter Zijlstra , LKML , linux-mm@kvack.org List-ID: Mel Gorman wrote: > Fragmentation avoidance depends on being able to use free pages from > lists of the appropriate migrate type. In the event this is not > possible, __rmqueue_fallback() selects a different list and in some > circumstances change the migratetype of the pageblock. Simplistically, > the more times this event occurs, the more likely that fragmentation > will be a problem later for hugepage allocation at least but there are > other considerations such as the order of page being split to satisfy > the allocation. Acked-by: Rik van Riel -- All rights reversed. -- 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