On Mon, Sep 11, 2017 at 01:48:39PM -0700, David Rientjes wrote: > On Mon, 11 Sep 2017, Roman Gushchin wrote: > > > Add a "groupoom" cgroup v2 mount option to enable the cgroup-aware > > OOM killer. If not set, the OOM selection is performed in > > a "traditional" per-process way. > > > > The behavior can be changed dynamically by remounting the cgroupfs. > > I can't imagine that Tejun would be happy with a new mount option, > especially when it's not required. > > OOM behavior does not need to be defined at mount time and for the entire > hierarchy. It's possible to very easily implement a tunable as part of > mem cgroup that is propagated to descendants and controls the oom scoring > behavior for that hierarchy. It does not need to be system wide and > affect scoring of all processes based on which mem cgroup they are > attached to at any given time. No, I don't think that mixing per-cgroup and per-process OOM selection algorithms is a good idea. So, there are 3 reasonable options: 1) boot option 2) sysctl 3) cgroup mount option I believe, 3) is better, because it allows changing the behavior dynamically, and explicitly depends on v2 (what sysctl lacks). So, the only question is should it be opt-in or opt-out option. Personally, I would prefer opt-out, but Michal has a very strong opinion here. Thanks! -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
