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cgroup: helper for checking rstat participation of css

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There are a few places where a conditional check is performed to validate a
given css on its rstat participation. This new helper tries to make the
code more readable where this check is performed.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
JP Kobryn 2025-05-14 17:19:36 -07:00 committed by Tejun Heo
parent 748922dcfa
commit 93b35663f2
1 changed files with 14 additions and 3 deletions
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17
kernel/cgroup/rstat.c
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@ -14,6 +14,17 @@ static DEFINE_PER_CPU(raw_spinlock_t, rstat_base_cpu_lock);
static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu);
/*
* Determines whether a given css can participate in rstat.
* css's that are cgroup::self use rstat for base stats.
* Other css's associated with a subsystem use rstat only when
* they define the ss->css_rstat_flush callback.
*/
static inline bool css_uses_rstat(struct cgroup_subsys_state *css)
{
return css_is_self(css) || css->ss->css_rstat_flush != NULL;
}
static struct css_rstat_cpu *css_rstat_cpu(
struct cgroup_subsys_state *css, int cpu)
{
@ -119,7 +130,7 @@ __bpf_kfunc void css_rstat_updated(struct cgroup_subsys_state *css, int cpu)
* Since bpf programs can call this function, prevent access to
* uninitialized rstat pointers.
*/
if (!css_is_self(css) && css->ss->css_rstat_flush == NULL)
if (!css_uses_rstat(css))
return;
/*
@ -390,7 +401,7 @@ __bpf_kfunc void css_rstat_flush(struct cgroup_subsys_state *css)
* Since bpf programs can call this function, prevent access to
* uninitialized rstat pointers.
*/
if (!is_self && css->ss->css_rstat_flush == NULL)
if (!css_uses_rstat(css))
return;
might_sleep();
@ -462,7 +473,7 @@ void css_rstat_exit(struct cgroup_subsys_state *css)
{
int cpu;
if (!css_is_self(css) && css->ss->css_rstat_flush == NULL)
if (!css_uses_rstat(css))
return;
css_rstat_flush(css);