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Date: Sat, 25 Feb 2012 17:32:53 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Yong Zhang <yong.zhang0@...il.com> Cc: Venki Pallipadi <venki@...gle.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Suresh Siddha <suresh.b.siddha@...el.com>, Aaron Durbin <adurbin@...gle.com>, Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1 On Fri, Feb 24, 2012 at 01:41:50PM +0800, Yong Zhang wrote: > On Thu, Feb 23, 2012 at 11:34:11AM -0800, Venki Pallipadi wrote: > > On Thu, Feb 23, 2012 at 1:30 AM, Peter Zijlstra <peterz@...radead.org> wrote: > > > Why not scheduler_ipi()? > > > > Was trying to avoid irq_enter/exit. As the work here is done in idle > > thread context, I though we could avoid enter/exit. > > It seems we could not. > At least RCU need it, see commit c5d753a55, otherwise we will get > warning like 'RCU used illegally from extended quiescent state!' If the use is tracing, then Steven Rostedt's patchset plus use of his _rcuidle() tracing variants handles this: https://lkml.org/lkml/2012/2/7/231 If this is instead algorithmic use of RCU, a set of patches I have queued up for 3.4 will be required. Thanx, Paul -- 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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