On Wed, 2015-07-22 at 16:12 -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 89.8us 7.4us > Westmere-EX 67.6us 9.3us >
But you don't mention anything about the overhead of enabling QUEUED_LOCK_STAT. This does several atomic ops, thus potentially thrashing workloads. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
