linux-kernel - Re: [PATCH 1/4] vmscan: simplify shrink_inactive

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Message-ID: <20100416145706.GK19264@csn.ul.ie>
Date:	Fri, 16 Apr 2010 15:57:07 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Dave Chinner <david@...morbit.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/4] vmscan: simplify shrink_inactive_list()

On Fri, Apr 16, 2010 at 09:40:13AM +1000, Dave Chinner wrote:
> On Thu, Apr 15, 2010 at 06:54:16PM +0200, Andi Kleen wrote:
> > > It's a buying-time venture, I'll agree but as both approaches are only
> > > about reducing stack stack they wouldn't be long-term solutions by your
> > > criteria. What do you suggest?
> > 
> > (from easy to more complicated):
> > 
> > - Disable direct reclaim with 4K stacks
> 
> Just to re-iterate: we're blowing the stack with direct reclaim on
> x86_64  w/ 8k stacks. 

Yep, that is not being disputed. By the way, what did you use to
generate your report? Was it CONFIG_DEBUG_STACK_USAGE or something else?
I used a modified bloat-o-meter to gather my data but it'd be nice to
be sure I'm seeing the same things as you (minus XFS unless I
specifically set it up).

> The old i386/4k stack problem is a red
> herring.
> 
> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@...morbit.com
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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