From: Nikola Ciprich <nikola.ciprich@linuxbox.cz>
To: linux-kernel mlist <linux-kernel@vger.kernel.org>
Cc: stable@kernel.org, netdev@vger.kernel.org
Subject: 3.0.12 - unregister_pernet_gen_subsys hogging whole system
Date: Thu, 22 Dec 2011 16:19:08 +0100 [thread overview]
Message-ID: <20111222151908.GA11020@pcnci.linuxbox.cz> (raw)
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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
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next reply other threads:[~2011-12-22 15:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 15:19 Nikola Ciprich [this message]
2011-12-22 21:52 ` 3.0.12 - unregister_pernet_gen_subsys hogging whole system Nikola Ciprich
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