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cgroup: change rstat function signatures from cgroup-based to css-based

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This non-functional change serves as preparation for moving to
subsystem-based rstat trees. To simplify future commits, change the
signatures of existing cgroup-based rstat functions to become css-based and
rename them to reflect that.

Though the signatures have changed, the implementations have not. Within
these functions use the css->cgroup pointer to obtain the associated cgroup
and allow code to function the same just as it did before this patch. At
applicable call sites, pass the subsystem-specific css pointer as an
argument or pass a pointer to cgroup::self if not in subsystem context.

Note that cgroup_rstat_updated_list() and cgroup_rstat_push_children()
are not altered yet since there would be a larger amount of css to
cgroup conversions which may overcomplicate the code at this
intermediate phase.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
JP Kobryn
2025-04-03 18:10:48 -07:00
committed by Tejun Heo
parent 845a724580
commit a97915559f
8 changed files with 78 additions and 61 deletions
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4
include/linux/cgroup.h
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@@ -693,8 +693,8 @@ static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
/*
* cgroup scalable recursive statistics.
*/
void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
void cgroup_rstat_flush(struct cgroup *cgrp);
void css_rstat_updated(struct cgroup_subsys_state *css, int cpu);
void css_rstat_flush(struct cgroup_subsys_state *css);
/*
* Basic resource stats.