diff options
| author | JP Kobryn <inwardvessel@gmail.com> | 2025-05-14 17:19:37 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2025-05-19 10:30:02 -1000 |
| commit | f3921fb7fdc23dd946b0c082f5fedca9ce75d506 (patch) | |
| tree | 9c551568a8f730c10b7854a3a2d150daa8fd2e97 | |
| parent | 93b35663f2018ff2accf4336a909081883eda76b (diff) | |
cgroup: document the rstat per-cpu initialization
The calls to css_rstat_init() occur at different places depending on the
context. Document the conditions that determine which point of
initialization is used.
Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | include/linux/cgroup-defs.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h index 5b8127d29dc5..e61687d5e496 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -169,6 +169,21 @@ struct cgroup_subsys_state { /* reference count - access via css_[try]get() and css_put() */ struct percpu_ref refcnt; + /* + * Depending on the context, this field is initialized + * via css_rstat_init() at different places: + * + * when css is associated with cgroup::self + * when css->cgroup is the root cgroup + * performed in cgroup_init() + * when css->cgroup is not the root cgroup + * performed in cgroup_create() + * when css is associated with a subsystem + * when css->cgroup is the root cgroup + * performed in cgroup_init_subsys() in the non-early path + * when css->cgroup is not the root cgroup + * performed in css_create() + */ struct css_rstat_cpu __percpu *rstat_cpu; /* @@ -530,6 +545,15 @@ struct cgroup { struct cgroup *dom_cgrp; struct cgroup *old_dom_cgrp; /* used while enabling threaded */ + /* + * Depending on the context, this field is initialized via + * css_rstat_init() at different places: + * + * when cgroup is the root cgroup + * performed in cgroup_setup_root() + * otherwise + * performed in cgroup_create() + */ struct cgroup_rstat_base_cpu __percpu *rstat_base_cpu; /* |