From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 17FDD6B026A for ; Thu, 19 Oct 2017 14:53:25 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id t188so6476373pfd.20 for ; Thu, 19 Oct 2017 11:53:25 -0700 (PDT) Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com. [67.231.153.30]) by mx.google.com with ESMTPS id g2si8882030pgr.330.2017.10.19.11.53.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 Oct 2017 11:53:24 -0700 (PDT) From: Roman Gushchin Subject: [RESEND v12 6/6] mm, oom, docs: describe the cgroup-aware OOM killer Date: Thu, 19 Oct 2017 19:52:18 +0100 Message-ID: <20171019185218.12663-7-guro@fb.com> In-Reply-To: <20171019185218.12663-1-guro@fb.com> References: <20171019185218.12663-1-guro@fb.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Roman Gushchin , Michal Hocko , Vladimir Davydov , Tetsuo Handa , Andrew Morton , David Rientjes , Tejun Heo , kernel-team@fb.com, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Document the cgroup-aware OOM killer. Signed-off-by: Roman Gushchin Acked-by: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Cc: Tetsuo Handa Cc: Andrew Morton Cc: David Rientjes Cc: Tejun Heo Cc: kernel-team@fb.com Cc: cgroups@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org --- Documentation/cgroup-v2.txt | 51 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt index 0bbdc720dd7c..69db5bf9c580 100644 --- a/Documentation/cgroup-v2.txt +++ b/Documentation/cgroup-v2.txt @@ -48,6 +48,7 @@ v1 is available under Documentation/cgroup-v1/. 5-2-1. Memory Interface Files 5-2-2. Usage Guidelines 5-2-3. Memory Ownership + 5-2-4. OOM Killer 5-3. IO 5-3-1. IO Interface Files 5-3-2. Writeback @@ -1031,6 +1032,28 @@ PAGE_SIZE multiple when read back. high limit is used and monitored properly, this limit's utility is limited to providing the final safety net. + memory.oom_group + + A read-write single value file which exists on non-root + cgroups. The default is "0". + + If set, OOM killer will consider the memory cgroup as an + indivisible memory consumers and compare it with other memory + consumers by it's memory footprint. + If such memory cgroup is selected as an OOM victim, all + processes belonging to it or it's descendants will be killed. + + This applies to system-wide OOM conditions and reaching + the hard memory limit of the cgroup and their ancestor. + If OOM condition happens in a descendant cgroup with it's own + memory limit, the memory cgroup can't be considered + as an OOM victim, and OOM killer will not kill all belonging + tasks. + + Also, OOM killer respects the /proc/pid/oom_score_adj value -1000, + and will never kill the unkillable task, even if memory.oom_group + is set. + memory.events A read-only flat-keyed file which exists on non-root cgroups. The following entries are defined. Unless specified @@ -1234,6 +1257,34 @@ to be accessed repeatedly by other cgroups, it may make sense to use POSIX_FADV_DONTNEED to relinquish the ownership of memory areas belonging to the affected files to ensure correct memory ownership. +OOM Killer +~~~~~~~~~~ + +Cgroup v2 memory controller implements a cgroup-aware OOM killer. +It means that it treats cgroups as first class OOM entities. + +Under OOM conditions the memory controller tries to make the best +choice of a victim, looking for a memory cgroup with the largest +memory footprint, considering leaf cgroups and cgroups with the +memory.oom_group option set, which are considered to be an indivisible +memory consumers. + +By default, OOM killer will kill the biggest task in the selected +memory cgroup. A user can change this behavior by enabling +the per-cgroup memory.oom_group option. If set, it causes +the OOM killer to kill all processes attached to the cgroup, +except processes with oom_score_adj set to -1000. + +This affects both system- and cgroup-wide OOMs. For a cgroup-wide OOM +the memory controller considers only cgroups belonging to the sub-tree +of the OOM'ing cgroup. + +The root cgroup is treated as a leaf memory cgroup, so it's compared +with other leaf memory cgroups and cgroups with oom_group option set. + +If there are no cgroups with the enabled memory controller, +the OOM killer is using the "traditional" process-based approach. + IO -- -- 2.13.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org