linux-kernel - Re: [PATCH REGRESSION FIX] x86 idle: restore mwait

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Message-ID: <20150317082203.GC28462@gmail.com>
Date:	Tue, 17 Mar 2015 09:22:03 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Ian Malone <ibmalone@...il.com>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Len Brown <lenb@...nel.org>, x86@...nel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>, stable@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH REGRESSION FIX] x86 idle: restore mwait_idle()


* Ian Malone <ibmalone@...il.com> wrote:

> On 15 March 2015 at 04:53, Mike Galbraith <umgwanakikbuti@...il.com> wrote:
> > On Sat, 2015-03-14 at 23:44 +0000, Ian Malone wrote:
> >> On 18 January 2014 at 16:14, Mike Galbraith <bitbucket@...ine.de> wrote:
> >> > On Sat, 2014-01-18 at 10:33 +0100, Mike Galbraith wrote:
> >> >> On Fri, 2014-01-17 at 05:20 +0100, Mike Galbraith wrote:
> >>
> >> > Signed-off-by: Mike Galbraith <bitbucket@...ine.de>
> >> > Cc: <stable@...r.kernel.org> # 3.10+
> >> > ---
> >> >  arch/x86/kernel/process.c |    9 ++++++---
> >> >  1 file changed, 6 insertions(+), 3 deletions(-)
> >> >
> >> > --- a/arch/x86/kernel/process.c
> >> > +++ b/arch/x86/kernel/process.c
> >> > @@ -427,18 +427,21 @@ static int prefer_mwait_c1_over_halt(con
> >>
> >> Hi, this series of patches never seem to have made it as far as the
> >> mainline kernel, anyone know what needs to happen next?
> >
> > My plan is to keep on carrying it locally for as long as I run new
> > kernels on crusty ole core2 boxen, then stop caring about them entirely
> > like the rest of the planet :)
> >
> 
> Looks like Ingo Molnar has committed to tip which is probably a good
> sign, thanks all.
> (Have to hand this system on to someone who wont be patching kernels...)

Guys, since I don't have the affected hardware, mind testing the 
latest sched/core tree:

  git clone git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
  cd tip
  git checkout sched/core
  # build a test kernel and boot it

Or if you already have a kernel git tree, do something like this to 
pick up the scheduler development tree:

  cd linux.git
  git remote add git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tip
  git remote update
  git checkout tip/sched/core
  # build a test kernel and boot it

and check whether the mwait related bugs are now fixed for good?

Thanks,

	Ingo
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