[systemd-devel] How to correctly use memory controls (MemoryLow) on unified hierarchy system?

[Michal Koutný]

On Fri, May 21, 2021 at 03:25:05PM +0300, Andrei Borzenkov <arvidjaar at gmail.com> wrote:
> Is it necessary to explicitly set it on every ancestor?
It depends against what reclaim you want to be protected.

Global memory reclaim (running out of RAM) -> set it on every ancestor.
Cgroup memory reclaim (hitting memory limit of an ancestor cgroup G) ->
set it till G children only.

It's explained (but not merged) with a picture here [1].

The typical case is the former and therefore typically you set
protection on all ancestors.

Michal

[1] https://lore.kernel.org/lkml/20200729140537.13345-2-mkoutny@suse.com/

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