From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx171.postini.com [74.125.245.171]) by kanga.kvack.org (Postfix) with SMTP id E29116B0062 for ; Thu, 9 Aug 2012 10:36:36 -0400 (EDT) Message-ID: <5023CADC.801@sandia.gov> Date: Thu, 9 Aug 2012 08:36:12 -0600 From: "Jim Schutt" MIME-Version: 1.0 Subject: Re: [RFC PATCH 0/5] Improve hugepage allocation success rates under load V3 References: <1344520165-24419-1-git-send-email-mgorman@suse.de> In-Reply-To: <1344520165-24419-1-git-send-email-mgorman@suse.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Linux-MM , Rik van Riel , Minchan Kim , LKML Hi Mel, On 08/09/2012 07:49 AM, Mel Gorman wrote: > Changelog since V2 > o Capture !MIGRATE_MOVABLE pages where possible > o Document the treatment of MIGRATE_MOVABLE pages while capturing > o Expand changelogs > > Changelog since V1 > o Dropped kswapd related patch, basically a no-op and regresses if fixed (minchan) > o Expanded changelogs a little > > Allocation success rates have been far lower since 3.4 due to commit > [fe2c2a10: vmscan: reclaim at order 0 when compaction is enabled]. This > commit was introduced for good reasons and it was known in advance that > the success rates would suffer but it was justified on the grounds that > the high allocation success rates were achieved by aggressive reclaim. > Success rates are expected to suffer even more in 3.6 due to commit > [7db8889a: mm: have order> 0 compaction start off where it left] which > testing has shown to severely reduce allocation success rates under load - > to 0% in one case. There is a proposed change to that patch in this series > and it would be ideal if Jim Schutt could retest the workload that led to > commit [7db8889a: mm: have order> 0 compaction start off where it left]. I was successful at resolving my Ceph issue on 3.6-rc1, but ran into some other issue that isn't immediately obvious, and prevents me from testing your patch with 3.6-rc1. Today I will apply your patch series to 3.5 and test that way. Sorry for the delay. -- Jim -- 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