Re: Bisection: Lost wakeups from b5179ac70de8

Paul E. McKenney
2016-05-24T12:50:23Z

On Tue, May 24, 2016 at 11:04:55AM +0200, Peter Zijlstra wrote:
> On Mon, May 23, 2016 at 07:04:10AM -0700, Paul E. McKenney wrote:
> > Hello, Peter,
> >
> > Current mainline doesn't do well with RCU torture testing, and the
> > symptom once again looks like lost wakeups. Thankfully, this time each
> > run takes only about an hour, and the false-positive/-negative rate
> > is negligible. This means that for the first time ever, "git bisect"
> > actually did something useful for me. The first bad commit is:
> >
> > b5179ac70de8 ("sched/fair: Prepare to fix fairness problems on migration").
> >
>
> Yeah, we have a patch for that.. I'll go writes a Changelog for it and
> put it to sched/urgent.
>
> See lkml.kernel.org/r/20160523091907.GD15728@worktop.ger.corp.intel.com

Thank you, will give it a shot.

Thanx, Paul