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Subject: Re: [PATCH 13/32] nohz: Adaptive tick stop and restart on nohz
 cpuset
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anton Blanchard <anton@au1.ibm.com>, Avi Kivity <avi@redhat.com>,
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        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Stephen Hemminger <shemminger@vyatta.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tim Pepper <lnxninja@linux.vnet.ibm.com>,
        Paul Menage <paul@paulmenage.org>
Date: Tue, 30 Aug 2011 14:44:10 +0200
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On Mon, 2011-08-29 at 20:28 +0200, Frederic Weisbecker wrote:
> tick_nohz_stop_sched_tick() checks that
> with {rcu,printk,arch}_needs_cpu() and restores a periodic behaviour
> until nobody else needs the CPU. 

tick_nohz_stop_sched_tick() should not restore stuff, it should at worst
fail to stop but never enable that's just weird.