Hello Chengming. On Mon, Aug 08, 2022 at 07:03:40PM +0800, Chengming Zhou <zhouchengming@xxxxxxxxxxxxx> wrote: > diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst > index dd84e34bc051..ade40506ab80 100644 > --- a/Documentation/admin-guide/cgroup-v2.rst > +++ b/Documentation/admin-guide/cgroup-v2.rst > @@ -968,6 +968,13 @@ All cgroup core files are prefixed with "cgroup." > killing cgroups is a process directed operation, i.e. it affects > the whole thread-group. > > + cgroup.psi > + A read-write single value file that allowed values are "0" and "1". > + The default is "1". > + > + Writing "0" to the file will disable the cgroup PSI stats accounting. > + Writing "1" to the file will re-enable the cgroup PSI stats accounting. > + I'd suggest explaining here explicitely, this control attribute is not hierarchical (i.e. PSI accounting in a cgroup does not affect accounting in descendants and doesn't need pass enablement via ancestors from root). And the purpose that it "saves" cycles (where). Regards, Michal
