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Message-ID: <20080219140033.GA9965@elte.hu> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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