linux-kernel - Re: [GIT PULL v2] timers updates for 3.15

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Date:	Thu, 13 Mar 2014 16:33:04 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Archs <linux-arch@...r.kernel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Huiqingding <huding@...hat.com>
Subject: Re: [GIT PULL v2] timers updates for 3.15

On Thu, Mar 13, 2014 at 12:05:10PM +0100, Ingo Molnar wrote:
> 
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > Ingo, Thomas,
> > 
> > Please pull the timers/cputime-fix-steal-v3 branch that can be found at:
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> > 	timers/cputime-fix-steal-v3
> > 
> > Only the last patch changed to address Peterz concern on arch Kbuild
> > layout. This got sorted out by running the script from b119fa61d440f
> > to alpabetically sort the entries.
> > 
> > ---
> > The main purpose of this set is to fix a bug on full dynticks configs
> > where steal time accounting appears to be zero in /proc/stat even
> > after a few seconds of competing guests running busy loops in a same
> > host CPU. It's not a regression though as it was there since the
> > beginning with full dynticks.
> > 
> > So patch [4/6] ("cputime: Fix jiffies based cputime assumption on
> > steal accounting") is the most important patch of the series. The rest
> > is mostly preparatory work to fix the bug plus various cleanups.
> > 
> > Thanks,
> > 	Frederic
> > ---
> > 
> > Frederic Weisbecker (6):
> >       cputime: Fix nsecs_to_cputime() return type cast
> >       cputime: Default implementation of nsecs -> cputime conversion
> >       cputime: Bring cputime -> nsecs conversion
> >       cputime: Fix jiffies based cputime assumption on steal accounting
> >       sched: Remove needless round trip nsecs <-> tick conversion of steal time
> >       arch: Remove stub cputime.h headers
> > 
> > 
> >  arch/alpha/include/asm/Kbuild         |  7 ++++---
> >  arch/alpha/include/asm/cputime.h      |  6 ------
> >  arch/cris/include/asm/Kbuild          |  3 ++-
> >  arch/cris/include/asm/cputime.h       |  6 ------
> >  arch/frv/include/asm/Kbuild           |  5 +++--
> >  arch/frv/include/asm/cputime.h        |  6 ------
> >  arch/m32r/include/asm/Kbuild          |  5 +++--
> >  arch/m32r/include/asm/cputime.h       |  6 ------
> >  arch/microblaze/include/asm/Kbuild    |  5 +++--
> >  arch/microblaze/include/asm/cputime.h |  1 -
> >  arch/mn10300/include/asm/Kbuild       |  3 ++-
> >  arch/mn10300/include/asm/cputime.h    |  1 -
> >  arch/score/include/asm/Kbuild         |  4 ++--
> >  arch/score/include/asm/cputime.h      |  6 ------
> >  arch/x86/include/asm/Kbuild           |  1 +
> >  arch/x86/include/asm/cputime.h        |  1 -
> 
> Does this tree also address the heavy conflicts with tip:core/locking? 

Ah I didn't hear about that. Thomas told me there was a conflict issue but
he couldn't tell me more about it.

> If not then we should probably carry this in a separate branch that 
> merges tip:core/locking and tip:timers/core.

So I propose you something even more simple. The choice of tip:timers/core
as a base was actually just about topic. But there is no dependency on it.
(And actually sched/core would have been a better choice for a base if any).

So in order to fix the conflict and minimize the dependencies, I just
rebased the patches on top of tip:core/locking only. No merge on top of that.
It seems to work pretty well.

The pullable result is in sched/cputime on my tree. Let me know if that's ok
for you.

Thanks.
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