Hi, I have run some tests to measure the improvement of the cpu plug duration with Tejun's patches. The results are available on this link: https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/Hotplug#Workqueue
As a summary, we can see a reduction of the plug sequence compared to the kernel v3.5 as kthreads are parked instead of being destroyed Regards, Vincent On 21 July 2012 19:24, Paul E. McKenney <paul...@linux.vnet.ibm.com> wrote: > On Fri, Jul 20, 2012 at 02:14:46PM -0700, Paul E. McKenney wrote: >> Hello! >> >> Tejun just this week posted patches that park the workqueue kthreads, >> which should reduce CPU-online latency under load. The easiest way to >> get these patches appears to be to pull them from Tejun's git tree: >> >> git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-wq-hotplug >> >> They pass some extremely mild rcutorture/hotplug testing, and more testing >> will follow. Please take a look at these and give them a go. > > And they pass moderate rcutorture/hotplug testing in a number of SMP > configurations. The UP tests failed due to an apparently unrelated > issue that I am chasing down. > > Thanx, Paul > _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
