Messages in this thread | | | Date | Fri, 1 Apr 2016 21:49:48 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH RFC] sched/fair: let cpu's cfs_rq to reflect task migration |
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On Sat, Apr 02, 2016 at 12:38:37AM +0800, Leo Yan wrote: > When task is migrated from CPU_A to CPU_B, scheduler will decrease > the task's load/util from the task's cfs_rq and also add them into > migrated cfs_rq. But if kernel enables CONFIG_FAIR_GROUP_SCHED then this > cfs_rq is not the same one with cpu's cfs_rq. As a result, after task is > migrated to CPU_B, then CPU_A still have task's stale value for > load/util; on the other hand CPU_B also cannot reflect new load/util > which introduced by the task. > > So this patch is to operate the task's load/util to cpu's cfs_rq, so > finally cpu's cfs_rq can really reflect task's migration.
Sorry but that is unintelligible.
What is the problem? Why do we care? How did you fix it? and at what cost?
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