diff options
| author | Linux Build Service Account <lnxbuild@localhost> | 2016-10-05 19:29:14 -0700 |
|---|---|---|
| committer | Gerrit - the friendly Code Review server <code-review@localhost> | 2016-10-05 19:29:13 -0700 |
| commit | 3ff37b4bacd0ffddadce5d701dfc2e1310649042 (patch) | |
| tree | 71800600ad221429d40c21a1c61f0ebdfea33305 /kernel/cgroup.c | |
| parent | 057bdafd976ca7609ed223dbd4473d535bcb6459 (diff) | |
| parent | 35f2961082327e970a35a14e72269072e3403b27 (diff) | |
Merge "RFC: FROMLIST: cgroup: reduce read locked section of cgroup_threadgroup_rwsem during fork"
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index ad4a12371069..cc6c7d0a6758 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -5376,6 +5376,12 @@ int __init cgroup_init(void) BUG_ON(cgroup_init_cftypes(NULL, cgroup_dfl_base_files)); BUG_ON(cgroup_init_cftypes(NULL, cgroup_legacy_base_files)); + /* + * The latency of the synchronize_sched() is too high for cgroups, + * avoid it at the cost of forcing all readers into the slow path. + */ + rcu_sync_enter_start(&cgroup_threadgroup_rwsem.rss); + mutex_lock(&cgroup_mutex); /* Add init_css_set to the hash table */ |