Introducing of cgroup-aware OOM killer changes the victim selection algorithm used by default: instead of picking the largest process, it will pick the largest memcg and then the largest process inside. This affects only cgroup v2 users. To provide a way to use cgroups v2 if the old OOM victim selection algorithm is preferred for some reason, the nogroupoom mount option is added. If set, the OOM selection is performed in a "traditional" per-process way. Both oom_priority and oom_group memcg knobs are ignored. Signed-off-by: Roman Gushchin <guro@xxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: kernel-team@xxxxxx Cc: cgroups@xxxxxxxxxxxxxxx Cc: linux-doc@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: linux-mm@xxxxxxxxx --- Documentation/admin-guide/kernel-parameters.txt | 1 + mm/memcontrol.c | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 28f1a0f84456..07891f1030aa 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -489,6 +489,7 @@ Format: <string> nosocket -- Disable socket memory accounting. nokmem -- Disable kernel memory accounting. + nogroupoom -- Disable cgroup-aware OOM killer. checkreqprot [SELINUX] Set initial checkreqprot flag value. Format: { "0" | "1" } diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d7dd293897ca..6a8235dc41f6 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -87,6 +87,9 @@ static bool cgroup_memory_nosocket; /* Kernel memory accounting disabled? */ static bool cgroup_memory_nokmem; +/* Cgroup-aware OOM disabled? */ +static bool cgroup_memory_nogroupoom; + /* Whether the swap controller is active */ #ifdef CONFIG_MEMCG_SWAP int do_swap_account __read_mostly; @@ -2822,6 +2825,9 @@ bool mem_cgroup_select_oom_victim(struct oom_control *oc) if (mem_cgroup_disabled()) return false; + if (cgroup_memory_nogroupoom) + return false; + if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) return false; @@ -6188,6 +6194,8 @@ static int __init cgroup_memory(char *s) cgroup_memory_nosocket = true; if (!strcmp(token, "nokmem")) cgroup_memory_nokmem = true; + if (!strcmp(token, "nogroupoom")) + cgroup_memory_nogroupoom = true; } return 0; } -- 2.13.5 -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html