linux-kernel - Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches

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Date:	Fri, 18 Jul 2008 15:42:57 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	penberg@...helsinki.fi, mpm@...enic.com,
	linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH][RFC] slub: increasing order reduces memory
	usage	of	some key caches


On Fri, 2008-07-18 at 09:20 -0500, Christoph Lameter wrote:
> Richard Kennedy wrote:
> 
> > Slabcache: radix_tree_node       Aliases:  0 Order :  1 Objects: 33564
> 
> Argh. Should this not be the dentry cache? Wrong numbers?
> 
> 
sorry -- yes I cut & pasted the wrong set.

**2.6.26
Slabcache: dentry                Aliases:  0 Order :  0 Objects: 22553
** Reclaim accounting active

Sizes (bytes)     Slabs              Debug                Memory
------------------------------------------------------------------------
Object :     208  Total  :    1188   Sanity Checks : Off  Total: 4866048
SlabObj:     208  Full   :    1186   Redzoning     : Off  Used : 4691024
SlabSiz:    4096  Partial:       0   Poisoning     : Off  Loss :  175024
Loss   :       0  CpuSlab:       2   Tracking      : Off  Lalig:       0
Align  :       8  Objects:      19   Tracing       : Off  Lpadd:  171072

**after make
Slabcache: dentry                Aliases:  0 Order :  0 Objects: 80076
** Reclaim accounting active

Sizes (bytes)     Slabs              Debug                Memory
------------------------------------------------------------------------
Object :     208  Total  :    4215   Sanity Checks : Off  Total: 17264640
SlabObj:     208  Full   :    4205   Redzoning     : Off  Used : 16655808
SlabSiz:    4096  Partial:       8   Poisoning     : Off  Loss :  608832
Loss   :       0  CpuSlab:       2   Tracking      : Off  Lalig:       0
Align  :       8  Objects:      19   Tracing       : Off  Lpadd:  606960


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