lkml.org 
[lkml]   [2011]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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


\
 
 \ /
  Last update: 2011-02-28 11:39    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site