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SubjectRe: [tip:sched/core] sched: Add NEED_RESCHED to the preempt_count
On Fri, Sep 27, 2013 at 05:14:27PM +0800, Yuanhan Liu wrote:
> On Wed, Sep 25, 2013 at 09:38:38AM -0700, tip-bot for Peter Zijlstra wrote:
> > Commit-ID: f27dde8deef33c9e58027df11ceab2198601d6a6
> > Gitweb: http://git.kernel.org/tip/f27dde8deef33c9e58027df11ceab2198601d6a6
> > Author: Peter Zijlstra <peterz@infradead.org>
> > AuthorDate: Wed, 14 Aug 2013 14:55:31 +0200
> > Committer: Ingo Molnar <mingo@kernel.org>
> > CommitDate: Wed, 25 Sep 2013 14:07:49 +0200
> >
> > sched: Add NEED_RESCHED to the preempt_count
>
> Hi Peter,
>
> FYI, here we found a pigz regression by this commit.

I just can't help myself; but pigs aren't supposed to fly anyway! :-)

> Here is a list all of changed stats by this commit and it's parent 4a2b4b222743bb07fedf985b884550f2ca067ea9:
>
> time.involuntary_context_switches [ 3184 - 4753 ] [ 5.536e+05 - 5.9042e+05 ]
> time.voluntary_context_switches [ 84559 - 1.2223e+05 ] [ 1.1008e+07 - 1.1092e+07 ]

Gah, that looks like it completely wrecked preemptions.

What kind of PREEMPT Kconfig options do you use? Or rather; could you
attach your .config?


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