linux-kernel - Re: Regression: sched/preempt: Add static_key() to preempt

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Date:	Fri, 03 Jul 2015 15:15:27 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Pontus Fuchs <pontus.fuchs@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: Regression: sched/preempt: Add static_key() to preempt_notifiers breaks my KVM

At Wed, 1 Jul 2015 08:55:41 +0200,
Ingo Molnar wrote:
> 
> 
> * Josh Boyer <jwboyer@...oraproject.org> wrote:
> 
> > > Tested ok. Thanks.
> > 
> > We've had a report of this in Fedora now.  Is the above patch queued anywhere?
> > 
> > https://bugzilla.redhat.com/show_bug.cgi?id=1237143
> 
> Yes, it's in tip:sched/urgent, en route to Linus.

FYI, I checked the latest linux-next and indeed the warning is gone.
However, the mouse cursor moves very sluggish on KVM when booted as
UP.  Reverting the commit 1cde2930e154 fixes it.

So, the patch doesn't seem fixing all regressions.


thanks,

Takashi
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