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Date:	Tue, 11 Dec 2007 09:52:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dave Jones <davej@...hat.com>,
	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>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: tipc_init(), WARNING: at arch/x86/mm/highmem_32.c:52,
	[2.6.24-rc4-git5: Reported regressions from 2.6.23]


* Dave Jones <davej@...hat.com> wrote:

> 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.

yes, but that's largely due to "dont change SLAB because we've got SLUB" 
resistence to SLAB patches. It's a 2 minute hack to implement this for 
SLAB.

> 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.

that's actually a _bad_ ABI regression. Rafael, could you please add 
this to the regressions list?

> There's an alternative implementation in Documentation/vm/slabinfo.c 
> (why there not say, util-linux, home of current slabtop?)

the kernel should output /proc/slabinfo data with the same formatting, 
period.

	Ingo
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