On 4/4/23 05:07, Michal Koutný wrote:
Hi.
On Mon, Apr 03, 2023 at 01:41:33PM -0400, Waiman Long <longman@xxxxxxxxxx> wrote:
This patch is actually not related to the CLONE_INTO_GROUP problem in patch
1. It is a generic problem when multiple users are moving threads into
cgroup.threads of the same or different cpusets simultaneously.
I meant this:
__cgroup_procs_write
cgroup_kn_lock_live
mutex_lock(&cgroup_mutex)
and (more succintly)
cgroup_update_dfl_csses
lockdep_assert_held(&cgroup_mutex)
Even the threaded migrations should be synchronized here.
Can you please explain in more detail what's the problematic case?
You are right. I missed the cgroup_mutex synchronization here. So this
patch isn't needed. I will drop it in the next version.
Cheers,
Longman
