linux-kernel - Re: [PATCH 05/32] nohz: Move rcu dynticks idle mode handling to idle enter/exit APIs

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Message-ID: <20110904193703.GA9775@linux.vnet.ibm.com>
Date:	Sun, 4 Sep 2011 12:37:03 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	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 05/32] nohz: Move rcu dynticks idle mode handling to
 idle enter/exit APIs

On Fri, Sep 02, 2011 at 10:24:31AM +0200, Peter Zijlstra wrote:
> On Thu, 2011-09-01 at 18:41 -0700, Paul E. McKenney wrote:
> > > Now we could possibly add magic to rcu_read_unlock_special() to restart
> > > the tick in that case.
> > 
> > Not from NMI handlers we can't.  Unless I am really confused about the
> > code that restarts the tick.  Which is not impossible, but ... 
> 
> Uhm.. good point ;-) yes that will be somewhat detrimental to the
> overall OS health if we attempt such a thing.

But if you don't mind, I would very much like to use your question as
a Quick Quiz.  It should be a good one.  ;-)

							Thanx, Paul
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