diff mbox series

[9/9,RFC] cgroup: avoid allocating rstat when flush func not present

Message ID 20241224011402.134009-10-inwardvessel@gmail.com (mailing list archive)
State New
Headers show
Series cgroup: separate rstat trees | expand

Commit Message

JP Kobryn Dec. 24, 2024, 1:14 a.m. UTC 
If a given subsystem is not the base type and does not have a flush
func, do not allocate.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
---
 kernel/cgroup/rstat.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 03effaaf09a4..4feefa37fa46 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -423,6 +423,9 @@  int cgroup_rstat_init(struct cgroup_subsys_state *css)
 {
 	int cpu;
 
+	if (css->ss && !css->ss->css_rstat_flush)
+		return 0;
+
 	/* the root cgrp css has rstat_cpu preallocated */
 	if (!css->rstat_cpu) {
 		css->rstat_cpu = alloc_percpu(struct cgroup_rstat_cpu);
@@ -445,6 +448,9 @@  void cgroup_rstat_exit(struct cgroup_subsys_state *css)
 {
 	int cpu;
 
+	if (css->ss && !css->ss->css_rstat_flush)
+		return;
+
 	cgroup_rstat_flush(css);
 
 	/* sanity check */