From: Peter Zijlstra <peterz@infradead.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mgalbraith@suse.de, ahh@google.com,
bsegall@google.com, torvalds@linux-foundation.org,
matt@codeblueprint.co.uk, morten.rasmussen@arm.com,
pjt@google.com, pkondeti@infradead.org, tglx@linutronix.de,
byungchul.park@lge.com, mingo@kernel.org, rgkernel@gmail.com
Subject: Re: Bisection: Lost wakeups from b5179ac70de8
Date: Tue, 24 May 2016 11:04:55 +0200 [thread overview]
Message-ID: <20160524090455.GF3192@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160523140410.GA26287@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2016-05-24 9:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 14:04 Bisection: Lost wakeups from b5179ac70de8 Paul E. McKenney
2016-05-24 9:04 ` Peter Zijlstra [this message]
2016-05-24 12:50 ` Paul E. McKenney
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