linux-kernel - Re: [PATCH] procfs: provide slub's /proc/slabinfo

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Message-ID: <Pine.LNX.4.64.0801041235240.11479@schroedinger.engr.sgi.com>
Date:	Fri, 4 Jan 2008 12:37:20 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Andi Kleen <andi@...stfloor.org>, Matt Mackall <mpm@...enic.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Hugh Dickins <hugh@...itas.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>
Subject: Re: [PATCH] procfs: provide slub's /proc/slabinfo

On Fri, 4 Jan 2008, Peter Zijlstra wrote:

> I remember wli trying to work out a series that had minimal
> fragmentation. IIRC he was mixing a fibonaci series with the power of
> two series.
> 
> Bill, do you remember getting anywhere?

I tried various approaches to reduce the overhead that power of two slab 
sizes cause in SLUB during the initial comparison of memory use with SLOB. 
This involved creating slabs in 32 byte increments and trying to add a few 
additional extra slabs in between the power of two sizes. None of that led 
to convincing results.
 
I found that the SLAB scheme with power of two caches and two extra ones 
(96 and 192 bytes) was optimal.
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