linux-kernel - Re: [RFC 2/3] SLUB: Implement targeted reclaim and partial list defragmentation

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Message-ID: <20070505171153.GA19957@one.firstfloor.org>
Date:	Sat, 5 May 2007 19:11:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, dgc@....com,
	Eric Dumazet <dada1@...mosbay.com>, Mel Gorman <mel@....ul.ie>
Subject: Re: [RFC 2/3] SLUB: Implement targeted reclaim and partial list defragmentation

On Sat, May 05, 2007 at 08:42:50AM -0700, Christoph Lameter wrote:
> On Sat, 5 May 2007, Andi Kleen wrote:
> 
> > clameter@....com writes:
> > > 
> > > NOTE: This patch is for conceptual review. I'd appreciate any feedback
> > > especially on the locking approach taken here. It will be critical to
> > > resolve the locking issue for this approach to become feasable.
> > 
> > Do you have any numbers on how this improves dcache reclaim under memory pressure?
> 
> How does one measure something like that?

You could measure how many dentries are flushed before an > order 1 allocation
is satisfied?  Make sure to fill the dcache first.

There are no counters there for this, but that should be reasonably easy to add.

-Andi

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