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Date: Mon, 20 Dec 2010 17:02:09 +0100 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Frederic Weisbecker <fweisbec@...il.com> 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 07/15] nohz_task: Restart tick when RCU forces nohz task cpu quiescent state On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote: > If a cpu is in nohz mode due to a nohz task running, then > it is not able to notify quiescent states requested by other > CPUs. > > Then restart the tick to remotely force the quiescent states on the > nohz task cpus. -ENOPARSE.. if its in NOHZ state, it couldn't possibly need to participate in the quiescent state machine because the cpu is in a quiescent state and has 0 RCU activity. -- 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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