linux-kernel - Re: [PATCH 0/2] Disable zone_reclaim

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Date:	Fri, 18 Apr 2014 13:05:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Robert Haas <robertmhaas@...il.com>,
	Josh Berkus <josh@...iodbs.com>,
	Andres Freund <andres@...quadrant.com>,
	Christoph Lameter <cl@...ux.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH 0/2] Disable zone_reclaim_mode by default v2

On Tue,  8 Apr 2014 09:22:58 +0100 Mel Gorman <mgorman@...e.de> wrote:

> Changelog since v1
>  o topology comment updates
> 
> When it was introduced, zone_reclaim_mode made sense as NUMA distances
> punished and workloads were generally partitioned to fit into a NUMA
> node. NUMA machines are now common but few of the workloads are NUMA-aware
> and it's routine to see major performance due to zone_reclaim_mode being
> enabled but relatively few can identify the problem.
> 
> Those that require zone_reclaim_mode are likely to be able to detect when
> it needs to be enabled and tune appropriately so lets have a sensible
> default for the bulk of users.
> 

This patchset conflicts with  

commit 70ef57e6c22c3323dce179b7d0d433c479266612
Author:     Michal Hocko <mhocko@...e.cz>
AuthorDate: Mon Apr 7 15:37:01 2014 -0700
Commit:     Linus Torvalds <torvalds@...ux-foundation.org>
CommitDate: Mon Apr 7 16:35:50 2014 -0700

    mm: exclude memoryless nodes from zone_reclaim

It was pretty simple to resolve, but please check that I didn't miss
anything.
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