On Mon, Aug 3, 2009 at 12:45 PM, Serge E. Hallyn<serue@xxxxxxxxxx> wrote: > > This is probably a stupid idea, but... what about having zero > overhead at clone(), and instead, at cgroup_task_migrate(), > dequeue_task()ing all of the affected threads for the duration of > the migrate? > Or a simpler alternative - rather than taking the thread group leader's rwsem in cgroup_fork(), always take current's rwsem. Then you're always locking a (probably?) local rwsem and minimizing the overhead. So not quite zero overhead in the fork path, but I'd be surprised if it was measurable. In cgroup_attach_proc() you then have to take the rwsem of every thread in the process. Kind of the equivalent of a per-threadgroup big-reader lock. Paul _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
