linux-kernel - Re: [patch 09/10] Remove the SLOB allocator for 2.6.23

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Date:	Tue, 10 Jul 2007 18:27:08 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Pekka J Enberg <penberg@...helsinki.fi>
CC:	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, suresh.b.siddha@...el.com,
	corey.d.gough@...el.com, Matt Mackall <mpm@...enic.com>,
	Denis Vlasenko <vda.linux@...glemail.com>,
	Erik Andersen <andersen@...epoet.org>
Subject: Re: [patch 09/10] Remove the SLOB allocator for 2.6.23

Pekka J Enberg wrote:

> Curious, /proc/meminfo immediately after boot shows:
> 
> SLUB (debugging enabled):
> 
> (none):~# cat /proc/meminfo 
> MemTotal:        30260 kB
> MemFree:         22096 kB
> 
> SLUB (debugging disabled):
> 
> (none):~# cat /proc/meminfo 
> MemTotal:        30276 kB
> MemFree:         22244 kB
> 
> SLOB:
> 
> (none):~# cat /proc/meminfo 
> MemTotal:        30280 kB
> MemFree:         22004 kB
> 
> That's 92 KB advantage for SLUB with debugging enabled and 240 KB when 
> debugging is disabled.

Interesting. What kernel version are you using?


> Nick, Matt, care to retest SLUB and SLOB for your setups?

I don't think there has been a significant change in the area of
memory efficiency in either since I last tested, and Christoph and
I both produced the same result.

I can't say where SLOB is losing its memory, but there are a few
places that can still be improved, so I might get keen and take
another look at it once all the improvements to both allocators
gets upstream.

-- 
SUSE Labs, Novell Inc.
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