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Date: Tue, 21 Dec 2010 00:39:01 +0100 From: Frederic Weisbecker <fweisbec@...il.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>, Lai Jiangshan <laijs@...fujitsu.com>, Andrew Morton <akpm@...ux-foundation.org>, Anton Blanchard <anton@....ibm.com>, Tim Pepper <lnxninja@...ux.vnet.ibm.com> Subject: Re: [RFC PATCH 05/15] nohz_task: Restart the tick when another task compete on the cpu On Mon, Dec 20, 2010 at 04:53:21PM +0100, Peter Zijlstra wrote: > On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote: > > +#ifdef CONFIG_NO_HZ_TASK > > + /* > > + * CHECKME: > > + * Ideally, we need to check if the target has a nohz task > > + * and only send the IPI if so. But there is nothing but > > + * a racy way to do that. Or can we assume at that point > > + * of the wake up that if cpu_has_nohz_task(cpu) is 0, then > > + * it's ok, even if it has a task about to switch to nohz > > + * task mode? > > + */ > > + if (rq->nr_running == 2) > > + smp_send_update_nohz_task_cpu(cpu); > > +#endif > > This is the wrong place, use ttwu_activate(), since activate_task() is > the thing that pokes at nr_running. Ok, will do. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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