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SubjectRe: [PATCH 1/4] cgroup: change locking order in attach_task_by_pid()
On 09/05, Tejun Heo wrote:
>
> cgroup_mutex is updated to nest inside threadgroup_fork_lock instead
> of the other way around. threadgroup locking is scheduled to be
> updated to cover all threadgroup altering operations and nesting it
> inside cgroup_mutex complicates locking dependency unnecessarily.

Could you please explain this change?

I can't understand why threadgroup_lock() under cgroup_mutex is bad.
Do you mean we can deadlock otherwise?

And, this means we can't change cpuset_do_move_task() to do
threadgroup_lock().

Oleg.



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