Messages in this thread | | | Subject | Re: [patch 3/6] sched, nohz: sched group, domain aware nohz idle load balancing | From | Peter Zijlstra <> | Date | Thu, 24 Nov 2011 12:53:49 +0100 |
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On Fri, 2011-11-18 at 15:03 -0800, Suresh Siddha wrote: > Make nohz idle load balancing more scalabale by using the nr_busy_cpus in > the struct sched_group_power. > > Idle load balance is kicked on one of the idle cpu's when there is atleast > one idle cpu and > > - a busy rq having more than one task or > > - a busy scheduler group having multiple busy cpus that exceed the sched group > power or > > - for the SD_ASYM_PACKING domain, if the lower numbered cpu's in that > domain are idle compared to the busy ones. > > This will help in kicking the idle load balancing request only when > there is a real imbalance. And once it is mostly balanced, these kicks will > be minimized. > > These changes helped improve the workload that is context switch intensive > between number of task pairs by 2x on a 8 socket NHM-EX based system.
OK, but the nohz idle balance will still iterate the whole machine instead of smaller parts, right?
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