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From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Ingo Molnar <mingo@elte.hu>, Lai Jiangshan <laijs@cn.fujitsu.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Anton Blanchard <anton@au1.ibm.com>,
	Tim Pepper <lnxninja@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH 03/15] nohz_task: Make tick stop and restart callable outside idle
Date: Tue, 21 Dec 2010 02:34:39 +0100	[thread overview]
Message-ID: <20101221013437.GL1715@nowhere> (raw)
In-Reply-To: <1292862311.5021.34.camel@laptop>

On Mon, Dec 20, 2010 at 05:25:11PM +0100, Peter Zijlstra wrote:
> On Mon, 2010-12-20 at 11:19 -0500, Steven Rostedt wrote:
> > On Mon, 2010-12-20 at 16:48 +0100, Peter Zijlstra wrote:
> > > On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> > > > +                       if (!current->pid)
> > > 
> > > I'm not exactly sure that's the sanest way to test if you're the idle
> > > thread...
> > 
> > Would
> > 
> >  if (idle_cpu(cpu))
> > 
> > be better?
> 
> Lots ;-)

I wondered about that too, will update.

Thanks.

  reply	other threads:[~2010-12-21  1:34 UTC|newest]

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-20 15:24 [RFC PATCH 00/15] Nohz task support Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 01/15] nohz_task: New mask for cpus having nohz task Frederic Weisbecker
2010-12-24  8:00   ` Lai Jiangshan
2010-12-24  8:19     ` Dario Faggioli
2010-12-24 12:29       ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 02/15] nohz_task: Avoid nohz task cpu as non-idle timer target Frederic Weisbecker
2010-12-20 15:47   ` Peter Zijlstra
2010-12-20 16:06     ` Steven Rostedt
2010-12-20 16:12       ` Peter Zijlstra
2010-12-21  0:20         ` Frederic Weisbecker
2010-12-21  7:51           ` Peter Zijlstra
2010-12-21 13:58             ` Frederic Weisbecker
2010-12-21  0:13     ` Frederic Weisbecker
2010-12-21  7:50       ` Peter Zijlstra
2010-12-21 13:52         ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 03/15] nohz_task: Make tick stop and restart callable outside idle Frederic Weisbecker
2010-12-20 15:48   ` Peter Zijlstra
2010-12-20 16:19     ` Steven Rostedt
2010-12-20 16:25       ` Peter Zijlstra
2010-12-21  1:34         ` Frederic Weisbecker [this message]
2010-12-20 15:24 ` [RFC PATCH 04/15] nohz_task: Stop the tick when the nohz task runs alone Frederic Weisbecker
2010-12-20 15:51   ` Peter Zijlstra
2010-12-20 23:37     ` Frederic Weisbecker
2010-12-21  7:35       ` Peter Zijlstra
2010-12-21 13:22         ` Frederic Weisbecker
2010-12-21 14:34           ` Steven Rostedt
2010-12-21 15:14             ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 05/15] nohz_task: Restart the tick when another task compete on the cpu Frederic Weisbecker
2010-12-20 15:53   ` Peter Zijlstra
2010-12-20 23:39     ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 06/15] nohz_task: Keep the tick if rcu needs it Frederic Weisbecker
2010-12-20 15:58   ` Peter Zijlstra
2010-12-20 23:49     ` Frederic Weisbecker
2010-12-21  0:12       ` Jonathan Corbet
2010-12-21  2:10         ` Frederic Weisbecker
2010-12-21  8:10     ` Paul E. McKenney
2010-12-20 15:24 ` [RFC PATCH 07/15] nohz_task: Restart tick when RCU forces nohz task cpu quiescent state Frederic Weisbecker
2010-12-20 16:02   ` Peter Zijlstra
2010-12-20 23:52     ` Frederic Weisbecker
2010-12-21  7:41       ` Peter Zijlstra
2010-12-21 13:28         ` Frederic Weisbecker
2010-12-21 15:35         ` Paul E. McKenney
2010-12-20 15:24 ` [RFC PATCH 08/15] smp: Don't warn if irq are disabled but we don't wait for the ipi Frederic Weisbecker
2010-12-20 16:03   ` Peter Zijlstra
2010-12-21  0:02     ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 09/15] rcu: Make rcu_enter,exit_nohz() callable from irq Frederic Weisbecker
2010-12-21 19:26   ` Paul E. McKenney
2010-12-21 19:27     ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 10/15] nohz_task: Enter in extended quiescent state when in userspace Frederic Weisbecker
2010-12-20 16:18   ` Peter Zijlstra
2010-12-21  1:27     ` Frederic Weisbecker
2010-12-21  8:04       ` Peter Zijlstra
2010-12-21 14:06         ` Frederic Weisbecker
2010-12-21 19:28   ` Paul E. McKenney
2010-12-21 21:49     ` Frederic Weisbecker
2010-12-22  2:20       ` Paul E. McKenney
2010-12-20 15:24 ` [RFC PATCH 11/15] x86: Nohz task support Frederic Weisbecker
2010-12-20 16:23   ` Peter Zijlstra
2010-12-21  1:30     ` Frederic Weisbecker
2010-12-21  8:05       ` Peter Zijlstra
2010-12-21 14:19         ` Frederic Weisbecker
2010-12-21 15:12         ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 12/15] clocksource: Ignore nohz task cpu in clocksource watchdog Frederic Weisbecker
2010-12-20 16:27   ` Peter Zijlstra
2010-12-21  1:40     ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 13/15] sched: Protect nohz task cpu affinity Frederic Weisbecker
2010-12-20 16:28   ` Peter Zijlstra
2010-12-20 17:05     ` Steven Rostedt
2010-12-21  1:55       ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 14/15] nohz_task: Clear nohz task attribute on exit() Frederic Weisbecker
2010-12-20 16:30   ` Peter Zijlstra
2010-12-21  1:48     ` Frederic Weisbecker
2010-12-21  8:07       ` Peter Zijlstra
2010-12-21 14:22         ` Frederic Weisbecker
2010-12-20 15:24 ` [RFC PATCH 15/15] nohz_task: Procfs interface Frederic Weisbecker
2010-12-20 15:42   ` Peter Zijlstra
2010-12-20 15:57     ` Frederic Weisbecker
2010-12-20 16:16       ` Peter Zijlstra
2010-12-21  1:24         ` Frederic Weisbecker
2010-12-21  8:14           ` Peter Zijlstra
2010-12-21 14:00             ` Avi Kivity
2010-12-21 17:05               ` Frederic Weisbecker
2010-12-21 18:17                 ` Avi Kivity
2010-12-21 21:08                   ` Frederic Weisbecker
2010-12-22  9:22                     ` Avi Kivity
2010-12-22  9:51                       ` Peter Zijlstra
2010-12-22 20:41                         ` Frederic Weisbecker
2010-12-21 14:26             ` Frederic Weisbecker
2010-12-20 15:44 ` [RFC PATCH 00/15] Nohz task support Steven Rostedt
2010-12-20 23:33   ` Frederic Weisbecker
2010-12-21  1:36     ` Steven Rostedt
2010-12-21  2:15       ` Frederic Weisbecker
2010-12-21  7:34     ` Peter Zijlstra
2010-12-21 13:13       ` Frederic Weisbecker
2010-12-21 13:56     ` Avi Kivity
2010-12-21 17:01       ` Frederic Weisbecker
2010-12-20 16:35 ` Peter Zijlstra
2010-12-21  1:53   ` Frederic Weisbecker

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