Messages in this thread | | | Date | Tue, 14 Jul 2015 14:48:33 -0400 | From | Waiman Long <> | Subject | Re: [PATCH 4/7] locking/pvqspinlock: Collect slowpath lock statistics |
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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
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