linux-kernel - Re: nohz problem with idle time on old hardware

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Message-ID: <20140409121522.50ccee9a@gandalf.local.home>
Date:	Wed, 9 Apr 2014 12:15:22 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Matthew Whitehead <tedheadster@...il.com>,
	John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mwhitehe@...hat.com, Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: nohz problem with idle time on old hardware

On Wed, 9 Apr 2014 21:26:51 +0530
Viresh Kumar <viresh.kumar@...aro.org> wrote:


> When HRES isn't enabled and NOHZ isn't enabled as well, in that
> case we should stick to the periodic code from tick-common.c and
> the oneshot options of tick_nohz_switch_to_nohz() or
> hrtimer_switch_to_hres() shouldn't be used. And so, we still need
> those checks, as per my understanding. :)

The one thing we can agree on is that the current code is wrong :-)

> 
> Lets see what others have for this discussion :)

Yeah, those that actually wrote this code should have a say in this.

-- Steve
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