linux-kernel - Re: + fix-spellings-of-slab-allocator-section-in-init-kconfig.patch added to -mm tree

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Message-ID: <20070509003323.GX11115@waste.org>
Date:	Tue, 8 May 2007 19:33:23 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	clameter@....com
Subject: Re: + fix-spellings-of-slab-allocator-section-in-init-kconfig.patch added to -mm tree

On Wed, May 09, 2007 at 01:32:20AM +0100, Alan Cox wrote:
> > (without SLAB emulation) and fragmentation was not the driving force
> > for replacement. Small Linux 1.x machines frequently had uptimes of 1+
> > years without fragmenting to death. Instead, it was performance with
> 
> 8MB for a bit over 3 years.... (1.2.13lmp)
> 
> The fragmentation issue I think is overbaked. A lot of the academic work
> argues that there is pretty much no long term difference between first
> fit, best fit, and most of the clever algorithms (obviously stupid ones
> like "take the middle out of the biggest space allocator" do perform
> worse). For MMUless boxes fragmentation is a big issue but not for normal
> systems.

Further, the received wisdom that fragmentation of SLAB-like systems
is better is not above doubt. Our own issues with dcache fragmentation
suggest it's far from perfect.

-- 
Mathematics is the supreme nostalgia of our time.
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