Re: [cpuops cmpxchg double V3 0/5] this_cpu_cmpxchg_double support

[Tejun Heo]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/