On Fri, May 21, 2021 at 03:25:05PM +0300, Andrei Borzenkov <arvidjaar@xxxxxxxxx> 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@xxxxxxxx/
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