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Date: Tue, 14 Jul 2015 14:48:33 -0400 From: Waiman Long <waiman.long@...com> To: Peter Zijlstra <peterz@...radead.org> CC: Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, linux-kernel@...r.kernel.org, Scott J Norton <scott.norton@...com>, Douglas Hatch <doug.hatch@...com> Subject: Re: [PATCH 4/7] locking/pvqspinlock: Collect slowpath lock statistics On 07/12/2015 04:22 AM, Peter Zijlstra wrote: > On Sat, Jul 11, 2015 at 04:36:55PM -0400, Waiman Long wrote: >> This patch enables the accumulation of kicking and waiting related >> PV qspinlock statistics when the new QUEUED_LOCK_STAT configuration >> option is selected. It also enables the collection of kicking and >> wakeup latencies which have a heavy dependency on the CPUs being used. >> >> The measured latencies for different CPUs are: >> >> CPU Wakeup Kicking >> --- ------ ------- >> Haswell-EX 26.4us 9.2us >> Westmere-EX 99.4US 25.5us >> >> So Haswell is much faster than Westmere. >> >> The accumulated lock statistics will be reported in debugfs under the >> pv-qspinlock directory. > You've again stuck this behind non-trivial patches :-( I will move that patch into the front in the new patchset. Cheers, Longman -- 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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