Re: [PATCH 6/6] Makes procs file writable to move all threads by tgid at once

Paul Menage
2009-08-05T16:11:56Z

On Wed, Aug 5, 2009 at 3:20 AM, Louis Rilling<Louis.Rilling@kerlabs.com> wrote:
>
> The downside of this is teaching lockdep about this recursive locking. Not that
> simple actually...

Don't we just give each thread's lock its own lock class? That's what
we did for the cgroup hierarchy_mutex.

> so that such cases are currently handled using a higher-level
> lock that prevents races in locking the whole chain (there was one such example
> for locking all vmas with KVM). IIUC, the intent here is to avoid such
> higher-level lock.

cgroup_mutex already fulfills the role of the higher-level lock.

Paul