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| author | Yafang Shao <laoar.shao@gmail.com> | 2023-10-29 09:14:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-19 07:04:25 +0300 |
| commit | dd9542ae7c7ca82ed2d7c185754ba9026361f6bc (patch) | |
| tree | 2e6728516d62e696b8966d08ac4b87b72867202d /include | |
| parent | bcd51480439499d5f8605ba2f3edb5bd0dd81fd8 (diff) | |
| download | linux-dd9542ae7c7ca82ed2d7c185754ba9026361f6bc.tar.xz | |
cgroup: Make operations on the cgroup root_list RCU safe
commit d23b5c577715892c87533b13923306acc6243f93 upstream.
At present, when we perform operations on the cgroup root_list, we must
hold the cgroup_mutex, which is a relatively heavyweight lock. In reality,
we can make operations on this list RCU-safe, eliminating the need to hold
the cgroup_mutex during traversal. Modifications to the list only occur in
the cgroup root setup and destroy paths, which should be infrequent in a
production environment. In contrast, traversal may occur frequently.
Therefore, making it RCU-safe would be beneficial.
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
To: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 265da00a1a8b..7e7bc25a1aa3 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -558,6 +558,7 @@ struct cgroup_root { /* A list running through the active hierarchies */ struct list_head root_list; + struct rcu_head rcu; /* Hierarchy-specific flags */ unsigned int flags; |