From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikola Ciprich Subject: 3.0.12 - unregister_pernet_gen_subsys hogging whole system Date: Thu, 22 Dec 2011 16:19:08 +0100 Message-ID: <20111222151908.GA11020@pcnci.linuxbox.cz> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="wac7ysb48OaltWcw" Cc: stable@kernel.org, netdev@vger.kernel.org To: linux-kernel mlist Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org --wac7ysb48OaltWcw Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, after updating one of our servers to 3.0.12 kernel, it became painfully slo= w (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 a= sk, 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 th= is? I'll provide all debugging information I can if needed.. thanks a lot in advance with best regards nik --=20 ------------------------------------- Ing. Nikola CIPRICH LinuxBox.cz, s.r.o. 28. rijna 168, 709 01 Ostrava tel.: +420 596 603 142 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: servis@linuxbox.cz ------------------------------------- --wac7ysb48OaltWcw Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEARECAAYFAk7zSmwACgkQ3xdJJrLygV6OaACfc9yp//bLzKRyt6pqSkYJWaBU mzIAmgOw9Wk1wwqLrTSGVHtnXEcqH8O6 =L4u3 -----END PGP SIGNATURE----- --wac7ysb48OaltWcw--