[PATCH 00/21] sched: Reduce runqueue lock contention -v6

[Peter Zijlstra]

This patch series aims to optimize remote wakeups by moving most of the
work of the wakeup to the remote cpu and avoid bouncing runqueue data
structures where possible.

As measured by sembench (which basically creates a wakeup storm) on my
dual-socket westmere:

$ for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo performance > $i; done
$ echo 4096 32000 64 128 > /proc/sys/kernel/sem
$ ./sembench -t 2048 -w 1900 -o 0

unpatched: run time 30 seconds 647278 worker burns per second
patched:   run time 30 seconds 816715 worker burns per second

I've queued this series for .40.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/