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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