Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763584Ab3IEJOl (ORCPT ); Thu, 5 Sep 2013 05:14:41 -0400 Received: from gmmr4.centrum.cz ([46.255.227.253]:42749 "EHLO gmmr4.centrum.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763266Ab3IEJOj (ORCPT ); Thu, 5 Sep 2013 05:14:39 -0400 To: =?utf-8?q?Michal_Hocko?= Subject: =?utf-8?q?Re=3A_=5Bpatch_0=2F7=5D_improve_memcg_oom_killer_robustness_v2?= Date: Thu, 05 Sep 2013 11:14:30 +0200 From: "azurIt" Cc: =?utf-8?q?Johannes_Weiner?= , =?utf-8?q?Andrew_Morton?= , =?utf-8?q?David_Rientjes?= , =?utf-8?q?KAMEZAWA_Hiroyuki?= , =?utf-8?q?KOSAKI_Motohiro?= , , , , , References: <1375549200-19110-1-git-send-email-hannes@cmpxchg.org>, <20130803170831.GB23319@cmpxchg.org>, <20130830215852.3E5D3D66@pobox.sk>, <20130902123802.5B8E8CB1@pobox.sk>, <20130903204850.GA1412@cmpxchg.org>, <20130904114523.A9F0173C@pobox.sk>, <20130904115741.GA28285@dhcp22.suse.cz>, <20130904141000.0F910EFA@pobox.sk> <20130904122632.GB28285@dhcp22.suse.cz> In-Reply-To: <20130904122632.GB28285@dhcp22.suse.cz> X-Mailer: Centrum Email 5.3 X-Priority: 3 X-Original-From: azurit@pobox.sk MIME-Version: 1.0 Message-Id: <20130905111430.CB1392B4@pobox.sk> X-Maser: oho Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4163 Lines: 124 >> >[...] >> >> My script has just detected (and killed) another freezed cgroup. I >> >> must say that i'm not 100% sure that cgroup was really freezed but it >> >> has 99% or more memory usage for at least 30 seconds (well, or it has >> >> 99% memory usage in both two cases the script was checking it). Here >> >> are stacks of processes inside it before they were killed: >> >[...] >> >> pid: 26536 >> >> stack: >> >> [] refrigerator+0x95/0x160 >> >> [] get_signal_to_deliver+0x1cb/0x540 >> >> [] do_signal+0x6b/0x750 >> >> [] do_notify_resume+0x55/0x80 >> >> [] retint_signal+0x3d/0x7b >> >> [] 0xffffffffffffffff >> > >> >[...] >> > >> >This task is sitting in the refigerator which means it has been frozen >> >by the freezer cgroup most probably. I am not familiar with the >> >implementation but my recollection is that you have to thaw that group >> >in order the killed process can pass away. >> >> Yes, my script is freezing the cgroup before killing processes inside >> it. Stacks are taken after the freeze, it that problem? > >I thought you had a problem to remove this particular group... >-- >Michal Hocko >SUSE Labs My script detected another freezed cgroup today, sending stacks. Is there anything interesting? pid: 947 stack: [] sleep_on_page_killable+0xe/0x40 [] __lock_page_killable+0x67/0x70 [] generic_file_aio_read+0x4d7/0x790 [] do_sync_read+0xea/0x130 [] vfs_read+0xf0/0x220 [] sys_read+0x51/0x90 [] system_call_fastpath+0x18/0x1d [] 0xffffffffffffffff pid: 949 stack: [] sleep_on_page_killable+0xe/0x40 [] __lock_page_killable+0x67/0x70 [] generic_file_aio_read+0x4d7/0x790 [] do_sync_read+0xea/0x130 [] vfs_read+0xf0/0x220 [] sys_read+0x51/0x90 [] system_call_fastpath+0x18/0x1d [] 0xffffffffffffffff pid: 985 stack: [] sleep_on_page_killable+0xe/0x40 n[] __lock_page_killable+0x67/0x70 [] generic_file_aio_read+0x4d7/0x790 [] do_sync_read+0xea/0x130 [] vfs_read+0xf0/0x220 [] sys_read+0x51/0x90 [] system_call_fastpath+0x18/0x1d [] 0xffffffffffffffff pid: 987 stack: [] sleep_on_page_killable+0xe/0x40 [] __lock_page_killable+0x67/0x70 [] generic_file_aio_read+0x4d7/0x790 [] do_sync_read+0xea/0x130 [] vfs_read+0xf0/0x220 [] sys_read+0x51/0x90 [] system_call_fastpath+0x18/0x1d [] 0xffffffffffffffff pid: 1031 stack: [] mem_cgroup_oom_synchronize+0x165/0x190 [] pagefault_out_of_memory+0xe/0x120 [] mm_fault_error+0x9e/0x150 [] do_page_fault+0x404/0x490 [] page_fault+0x1f/0x30 [] 0xffffffffffffffff pid: 1032 stack: [] 0xffffffffffffffff pid: 1036 stack: [] mem_cgroup_oom_synchronize+0x165/0x190 [] pagefault_out_of_memory+0xe/0x120 [] mm_fault_error+0x9e/0x150 [] do_page_fault+0x404/0x490 [] page_fault+0x1f/0x30 [] 0xffffffffffffffff pid: 1038 stack: [] mem_cgroup_oom_synchronize+0x165/0x190 [] pagefault_out_of_memory+0xe/0x120 [] mm_fault_error+0x9e/0x150 [] do_page_fault+0x404/0x490 [] page_fault+0x1f/0x30 [] 0xffffffffffffffff -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/