netdev - 3.0.12 - unregister_pernet_gen_subsys hogging whole system

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Message-ID: <20111222151908.GA11020@pcnci.linuxbox.cz>
Date:	Thu, 22 Dec 2011 16:19:08 +0100
From:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
To:	linux-kernel mlist <linux-kernel@...r.kernel.org>
Cc:	stable@...nel.org, netdev@...r.kernel.org
Subject: 3.0.12 - 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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