Messages in this thread | | | Date | Thu, 22 Dec 2011 16:19:08 +0100 | From | Nikola Ciprich <> | Subject | 3.0.12 - unregister_pernet_gen_subsys hogging whole system |
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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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