linux-kernel - Re: [RFC-PATCH 0/7] Memory Compaction v1

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Message-Id: <20100122091504.6BF7.A69D9226@jp.fujitsu.com>
Date:	Fri, 22 Jan 2010 09:16:51 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC-PATCH 0/7] Memory Compaction v1

> > > Comments?
> > 
> > I think "Total pages reclaimed" increasing is not good thing ;)
> 
> First, I made a mistake in the patch. With the bug fixed, they're
> reduced. See the post later in the thread
> http://lkml.org/lkml/2010/1/6/215

Oh, I see. I'm glad the issue was alredy fixed.


> > Honestly, I haven't understand why your patch increase reclaimed and
> > the exactly meaning of the your tool's rclm field.
> > 
> > Can you share your mesurement script? May I run the same test?
> 
> Unfortunately at the moment it's part of a mini-testgrid setup I run out
> of the house. It doesn't lend itself to being stand-alone. I'll break it
> out as part of the next release.

surely good news :)


> > I like this patch, but I don't like increasing reclaim. I'd like to know
> > this patch require any vmscan change and/or its change mitigate the issue.
> > 
> 
> With the bug repaired, reclaims go from 105132 to 45935 with more huge
> pages allocated so right now, no special action is required.

ok. thanks.



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