Hi, Catalin,
On Thu, 2015-02-26 at 09:58 +0000, Catalin Marinas wrote:
> On Thu, Feb 26, 2015 at 05:16:53AM +0000, Huang Ying wrote:
> > FYI, we noticed the below changes on
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > commit 76835b0ebf8a7fe85beb03c75121419a7dec52f0 ("futex: Ensure
> > get_futex_key_refs() always implies a barrier")
> >
> >
> > testbox/testcase/testparams: lkp-wsx01/will-it-scale/performance-futex4
> >
> > 0429fbc0bdc297d6 76835b0ebf8a7fe85beb03c751
> > ---------------- --------------------------
> > %stddev %change %stddev
> > \ | \
> > 6314259 ± 0% -8.1% 5800079 ± 0% will-it-scale.per_thread_ops
> > 6274871 ± 0% -8.1% 5768747 ± 0% will-it-scale.per_process_ops
>
> This was raised before but I'm not sure we can do much about it:
>
> https://lkml.org/lkml/2014/10/26/189
Sorry for duplicated report.
> It would be interesting to know the difference in performance with the
> code prior to commits b0c29f79ecea and 11d4616bd07f which optimised the
> futex code but missed a barrier.
I will do some test for that.
Best Regards,
Huang, Ying
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