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Subject3.0.12 - unregister_pernet_gen_subsys hogging whole system
Hi,

after updating one of our servers to 3.0.12 kernel, it became painfully slow (actually
it's almost unusable).

trying perf top, I see following:

27465.00 - 59.8% : unregister_pernet_gen_subsys
3144.00 - 6.8% : __start_notes
1211.00 - 2.6% : swiotlb_sync_sg
1155.00 - 2.5% : swiotlb_unmap_sg_attrs
621.00 - 1.4% : pci_pm_init
565.00 - 1.2% : swiotlb_map_sg_attrs
503.00 - 1.1% : cgroup_attach_task

I wasn't too successfull trying to find something related, so I'd like to ask,
which subsystem might be calling unregister_pernet_gen_subsys and why?
I guess this is certaingly a bug... Could somebody please have a look at this?
I'll provide all debugging information I can if needed..

thanks a lot in advance

with best regards

nik

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Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
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