lkml.org 
[lkml]   [2022]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: sched/psi] sched/psi: Don't create cgroup PSI files when psi_disabled
The following commit has been merged into the sched/psi branch of tip:

Commit-ID: 58d8c2586cedb8a67f6f0dffa5eaed0f89135b39
Gitweb: https://git.kernel.org/tip/58d8c2586cedb8a67f6f0dffa5eaed0f89135b39
Author: Chengming Zhou <zhouchengming@bytedance.com>
AuthorDate: Fri, 26 Aug 2022 00:41:03 +08:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 09 Sep 2022 11:08:31 +02:00

sched/psi: Don't create cgroup PSI files when psi_disabled

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lore.kernel.org/r/20220825164111.29534-3-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 718a70c..96aefdb 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -3780,6 +3780,9 @@ 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;
}

\
 
 \ /
  Last update: 2022-09-09 16:02    [W:0.186 / U:0.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site