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Date: Wed, 2 Oct 2013 15:31:37 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Oleg Nesterov <oleg@...hat.com> Cc: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...nel.org>, Andrea Arcangeli <aarcange@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Steven Rostedt <rostedt@...dmis.org>, Viresh Kumar <viresh.kumar@...aro.org> Subject: Re: [PATCH] hotplug: Optimize {get,put}_online_cpus() On Wed, Oct 02, 2013 at 02:13:56PM +0200, Oleg Nesterov wrote: > In short: unless a gp elapses between _exit() and _enter(), the next > _enter() does nothing and avoids synchronize_sched(). That does however make the entire scheme entirely writer biased; increasing the need for the waitcount thing I have. Otherwise we'll starve pending readers. -- 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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