diff options
| author | Shakeel Butt <shakeel.butt@linux.dev> | 2026-03-11 04:01:01 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-03-12 01:16:21 +0300 |
| commit | 4ef420b3450026b56807e5d53001f80eb495403c (patch) | |
| tree | 032a895c6628d08085f3bcd31a9e68a403fc4f84 /include | |
| parent | 4616120fca7f6d48b4c640e3975352e451e9c2ce (diff) | |
| download | linux-4ef420b3450026b56807e5d53001f80eb495403c.tar.xz | |
cgroup: replace global cgroup_file_kn_lock with per-cgroup_file lock
Replace the global cgroup_file_kn_lock with a per-cgroup_file spinlock
to eliminate cross-cgroup contention as it is not really protecting
data shared between different cgroups.
The lock is initialized in cgroup_add_file() alongside timer_setup().
No lock acquisition is needed during initialization since the cgroup
directory is being populated under cgroup_mutex and no concurrent
accessors exist at that point.
Reported-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup-defs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h index bb92f5c169ca..ba26b5d05ce3 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -167,6 +167,7 @@ struct cgroup_file { struct kernfs_node *kn; unsigned long notified_at; struct timer_list notify_timer; + spinlock_t lock; }; /* |