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Date: Mon, 26 Mar 2012 10:02:00 +0200 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Rusty Russell <rusty@...tcorp.com.au> Cc: paulmck@...ux.vnet.ibm.com, "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, Arjan van de Ven <arjan@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, "Rafael J. Wysocki" <rjw@...k.pl>, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, Paul Gortmaker <paul.gortmaker@...driver.com>, Milton Miller <miltonm@....com>, "mingo@...e.hu" <mingo@...e.hu>, Tejun Heo <tj@...nel.org>, KOSAKI Motohiro <kosaki.motohiro@...il.com>, linux-kernel <linux-kernel@...r.kernel.org>, Linux PM mailing list <linux-pm@...r.kernel.org> Subject: Re: CPU Hotplug rework On Mon, 2012-03-26 at 11:11 +1030, Rusty Russell wrote: > Obviously, having callbacks hanging around until the CPU comes back is > not viable, nor is blocking preempt during the callbacks. Calling > get_online_cpus() is too heavy. -rt has patches (albeit somewhat ugly) to make get_online_cpus() a br style rw-lock. That is, it makes the read side a per-cpu lock/counter so that its much faster and only touches cpu-local state in the common case. It would be good to clean those up and make get_online_cpus() fast and usable. -- 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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