On Sun, 30 Dec 2018 at 13:04, Ingo Molnar <mi...@kernel.org> wrote: > > > * Vincent Guittot <vincent.guit...@linaro.org> wrote: > > > > Reported-by: Zhipeng Xie <xiezhipe...@huawei.com> > > > Cc: Bin Li <huawei.li...@huawei.com> > > > Cc: <sta...@vger.kernel.org> [4.10+] > > > Fixes: 9c2791f936ef (sched/fair: Fix hierarchical order in > > > rq->leaf_cfs_rq_list) > > > > If it only happens in update_blocked_averages(), the del leaf has been > > added by: > > a9e7f6544b9c (sched/fair: Fix O(nr_cgroups) in load balance path) > > So I think until we are confident in the proposed fixes, how about > applying Linus's patch that reverts a9e7f6544b9c and simplifies the list > manipulation?
looks good to me Thanks Vincent > > That way we can re-introduce the O(nr_cgroups) optimization without > pressure. > > I'll prepare a commit for sched/urgent that does this, please holler if > any of you disagrees! > > Thanks, > > Ingo
