Re: [PATCH] cgroup: replace global percpu_rwsem with signal_struct->group_rwsem when writing cgroup.procs/threads

Hello,

On Wed, Sep 03, 2025 at 07:11:07PM +0800, Yi Tao wrote:

As computer hardware advances, modern systems are typically equipped
with many CPU cores and large amounts of memory, enabling the deployment
of numerous applications. On such systems, container creation and
deletion become frequent operations, making cgroup process migration no
longer a cold path. This leads to noticeable contention with common
process operations such as fork, exec, and exit.

If you use CLONE_INTO_CGROUP, cgroup migration doesn't just become cold. It
disappears completely and CLONE_INTO_CGROUP doesn't need any global locks
from cgroup side. Are there reasons why you can't use CLONE_INTO_CGROUP?

Thanks.

-- 
tejun