linux-kernel - Re: Linux 2.6.25-rc2

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Date:	Tue, 19 Feb 2008 15:00:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: Linux 2.6.25-rc2


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> Ingo, a comment in slub.c explains it :
> 
> /*
>  * The SLUB_FASTPATH path is provisional and is currently disabled if the
>  * kernel is compiled with preemption or if the arch does not support
>  * fast cmpxchg operations. There are a couple of coming changes that will
>  * simplify matters and allow preemption. Ultimately we may end up making
>  * SLUB_FASTPATH the default.

well the feature is not complete and there are no reasons given _why_ 
it's not complete ... and even if there's a reason it should have been 
deferred to the next merge window. We still have 10 year old "this is a 
temporary hack" comments in the kernel ;-)

"hardware does not support it" is a valid argument, "kernel developer 
had no time to implement it properly" is not ;-)

	Ingo
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