linux-kernel - Re: tipc_init(), WARNING: at arch/x86/mm/highmem_32.c:52, [2.6.24-rc4-git5: Reported regressions from 2.6.23]

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Date:	Tue, 11 Dec 2007 01:27:20 -0500
From:	Dave Jones <davej@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: tipc_init(), WARNING: at arch/x86/mm/highmem_32.c:52,
	[2.6.24-rc4-git5: Reported regressions from 2.6.23]

On Sat, Dec 08, 2007 at 08:52:11PM +0100, Ingo Molnar wrote:

 > so even today's upstream kernel, which has 'ancient' SLUB code, SLAB and 
 > SLUB have essentially the same linecount:
 > 
 >   $ wc -l mm/slab.c mm/slub.c
 >   4478 mm/slab.c
 >   4125 mm/slub.c
 > 
 > (and while linecount != complexity, there is a strong relationship.)
 > 
 > With SLAB having 10 years more test coverage and tuning.

FWIW, the one thing slub does that slab doesn't that I find really nice
is being enable to enable debugging at boot time rather than compile time.

We don't get many people running benchmarks against the Fedora kernel,
so any scalability differences between slub/slab probably won't reach us
until we start shipping betas of the next RHEL based on the same kernel.

Which leaves my only other gripe.  It broke slabtop.
There's an alternative implementation in Documentation/vm/slabinfo.c
(why there not say, util-linux, home of current slabtop?) 

	Dave

-- 
http://www.codemonkey.org.uk
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