[PATCH 5/9] sched/psi: don't create cgroup PSI files when psi_disabled

Chengming Zhou
2022-07-21T04:05:52Z

commit 3958e2d0c34e ("cgroup: make per-cgroup pressure stall tracking configurable")
make PSI can be configured to skip per-cgroup stall accounting. And
doesn't expose PSI files in cgroup hierarchy.

This patch do the same thing when psi_disabled.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
---
kernel/cgroup/cgroup.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 1779ccddb734..1424da7ed2c4 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -3700,6 +3700,9 @@ static void cgroup_pressure_release(struct kernfs_open_file *of)

bool cgroup_psi_enabled(void)
{
+ if (static_branch_likely(&psi_disabled))
+ return false;
+
return (cgroup_feature_disable_mask & (1 << OPT_FEATURE_PRESSURE)) == 0;
}

--
2.36.1