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cgroup: Do not report unavailable v1 controllers in /proc/cgroups

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This is a followup to CONFIG-urability of cpuset and memory controllers
for v1 hierarchies. Make the output in /proc/cgroups reflect that
!CONFIG_CPUSETS_V1 is like !CONFIG_CPUSETS and
!CONFIG_MEMCG_V1 is like !CONFIG_MEMCG.

The intended effect is that hiding the unavailable controllers will hint
users not to try mounting them on v1.

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Michal Koutný 2024-09-09 18:32:23 +02:00 committed by Tejun Heo
parent 3c41382e92
commit af000ce852
1 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
kernel/cgroup/cgroup-v1.c
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@ -681,11 +681,14 @@ int proc_cgroupstats_show(struct seq_file *m, void *v)
* cgroup_mutex contention.
*/
for_each_subsys(ss, i)
for_each_subsys(ss, i) {
if (cgroup1_subsys_absent(ss))
continue;
seq_printf(m, "%s\t%d\t%d\t%d\n",
ss->legacy_name, ss->root->hierarchy_id,
atomic_read(&ss->root->nr_cgrps),
cgroup_ssid_enabled(i));
}
return 0;
}