Re: Bisection: Lost wakeups from b5179ac70de8

From: Peter Zijlstra
Date: Tue May 24 2016 - 05:07:44 EST

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.