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

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Date:	Fri, 02 Sep 2011 10:24:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
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 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.
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