* 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?
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
