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cgroup: document the rstat per-cpu initialization

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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>
This commit is contained in:
JP Kobryn
2025-05-19 10:30:02 -10:00
committed by Tejun Heo
parent 93b35663f2
commit f3921fb7fd
1 changed files with 24 additions and 0 deletions
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include/linux/cgroup-defs.h
+24
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@@ -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;
/*