Re: Possible regression with cgroups in 3.11

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On Mon 11-11-13 17:11:04, Markus Blank-Burian wrote:
> >
> > Out of curiosity, do you have memcg swap accounting enabled? Or do you
> > use kmem accounting? How does your cgroup tree look like?
> 
> I have compiled my kernel with CONFIG_MEMCG_SWAP,
> CONFIG_MEMCG_SWAP_ENABLED, CONFIG_MEMCG_KMEM and CONFIG_CGROUP_HUGETLB
> options, although our machines have no active swap space at the
> moment.

No swap means that no charges are done by a group non-member. So the
race Johannes was describing shouldn't be the problem in your case.

Out of curiosity, do you set any limit for kmem?

[...]
> memory.use_hierarchy support is enabled and memory is limited from the
> job directory. I have mounted the cgroup to /var/slurm/cgroup/memory
> in addition to the normal directory at /sys/fs/cgroup/memory.

How exactly have you mounted it there?
[...]

Btw. how reproducible is this? Do you think you could try to bisect
it down? Reducing bisection to mm/ and kernel/ diretories should be
sufficient I guess.
-- 
Michal Hocko
SUSE Labs
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