linux-kernel - Re: [PATCH 12/32] nohz: Try not to give the timekeeping duty to a cpuset nohz cpu

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Message-ID: <20110830153042.GA23932@sgi.com>
Date:	Tue, 30 Aug 2011 10:30:42 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>,
	Paul Menage <paul@...lmenage.org>
Subject: Re: [PATCH 12/32] nohz: Try not to give the timekeeping duty to a
 cpuset nohz cpu

On Tue, Aug 30, 2011 at 05:17:06PM +0200, Frederic Weisbecker wrote:
> On Mon, Aug 29, 2011 at 04:55:45PM +0200, Peter Zijlstra wrote:
> > On Mon, 2011-08-15 at 17:52 +0200, Frederic Weisbecker wrote:
> > > Try to give the timekeeing duty to a CPU that doesn't belong
> > > to any nohz cpuset when possible, so that we increase the chance
> > > for these nohz cpusets to run their CPUs out of periodic tick
> > > mode. 
> > 
> > You and Dmitiri might want to get together:
> > 
> > lkml.kernel.org/r/20110823195628.GB4533@....com
> 
> Right!
> 
> There is another missing piece in my patchset. If every non adaptive-nohz
> CPUs are sleeping, then none is handling the do_timer duty and adaptive nohz
> CPUs run with a stale jiffies and walltime.
> 
> I need to handle that.

Frederic,

Please note that the patch that Peter references (lkml.kernel.org/r/20110823195628.GB4533@....com) supports only the nohz=off case.
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