linux-kernel - Re: [cpuops cmpxchg double V3 0/5] this_cpu_cmpxchg

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Message-ID: <20110228103637.GA11045@htj.dyndns.org>
Date:	Mon, 28 Feb 2011 11:36:37 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [cpuops cmpxchg double V3 0/5] this_cpu_cmpxchg_double support

On Fri, Feb 25, 2011 at 11:38:50AM -0600, Christoph Lameter wrote:
> This patch series introduces this_cpu_cmpxchg_double().
> 
> x86 cpus support cmpxchg16b and cmpxchg8b instuction which are capable of
> switching two words instead of one during a cmpxchg.
> Two words allow to swap more state in an atomic instruction.
> 
> this_cpu_cmpxchg_double() is used in the slub allocator to avoid
> interrupt disable/enable in both alloc and free fastpath.
> Using the new operation significantly speeds up the fastpaths.

Pekka, Christoph, I applied the third and fifth patches to the percpu
tree.  Please feel free to pull from the following branch and apply
slub changes on top of it.

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-2.6.39

HEAD is b9ec40af0e18fb7d02106be148036c2ea490fdf9.  As git.korg seems a
bit slow to sync these days, it may be better to pull from
master.korg.

  ssh://master.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-2.6.39

Thank you.

-- 
tejun
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