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| Started by | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| First post | 2015-07-12 10:30 +0200 |
| Last post | 2015-07-12 10:30 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH 4/7] locking/pvqspinlock: Collect slowpath lock statistics Peter Zijlstra <peterz@infradead.org> - 2015-07-12 10:30 +0200
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Date | 2015-07-12 10:30 +0200 |
| Subject | Re: [PATCH 4/7] locking/pvqspinlock: Collect slowpath lock statistics |
| Message-ID | <pLkO6-5ZO-1@gated-at.bofh.it> |
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 :-( -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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