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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: andi@firstfloor.org, akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: SLUB: The unqueued Slab allocator
Date: Sat, 24 Feb 2007 14:28:35 +0900	[thread overview]
Message-ID: <20070224142835.4c7a3207.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0702221040140.2011@schroedinger.engr.sgi.com>

On Thu, 22 Feb 2007 10:42:23 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:

> > > G. Slab merging
> > > 
> > >    We often have slab caches with similar parameters. SLUB detects those
> > >    on bootup and merges them into the corresponding general caches. This
> > >    leads to more effective memory use.
> > 
> > Did you do any tests on what that does to long term memory fragmentation?
> > It is against the "object of same type have similar livetime and should
> > be clustered together" theory at least.
> 
> I have done no tests in that regard and we would have to assess the impact 
> that the merging has to overall system behavior.
> 
>From a viewpoint of a crash dump user, this merging will make crash dump
investigation very very very difficult.
So please avoid this merging if the benefit is nog big.

-Kame


  parent reply	other threads:[~2007-02-24  5:29 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-22  7:00 Christoph Lameter
2007-02-22  8:34 ` Peter Zijlstra
2007-02-22 15:25   ` Christoph Lameter
2007-02-22  8:58 ` David Miller
2007-02-22 15:26   ` Christoph Lameter
2007-02-22 10:49 ` Pekka Enberg
2007-02-22 15:15   ` Christoph Lameter
2007-02-22 17:54 ` Andi Kleen
2007-02-22 18:42   ` Christoph Lameter
2007-02-23  0:16     ` Andi Kleen
2007-02-23  4:55       ` Christoph Lameter
2007-02-24  5:28     ` KAMEZAWA Hiroyuki [this message]
2007-02-24  5:47       ` Christoph Lameter
2007-02-24  5:54         ` David Miller
2007-02-24 17:32           ` Christoph Lameter
2007-02-24 19:33             ` Jörn Engel
2007-02-25  0:14               ` Christoph Lameter
2007-02-25 12:23                 ` Jörn Engel
2007-02-25  0:53             ` David Miller

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