[Devel] Re: [PATCH 0/9] Containers (V9): Generic Process Containers

[Paul Menage]

On 4/30/07, Srivatsa Vaddagiri <vatsa at in.ibm.com> wrote:
> On Sun, Apr 29, 2007 at 02:37:21AM -0700, Paul Jackson wrote:
> > It builds and boots and mounts the cpuset file system ok.
> > But trying to write the 'mems' file hangs the system hard.
>
> Basically we are attempting a read_lock(&tasklist_lock) in
> container_task_count() after taking write_lock_irq(&tasklist_lock) in
> update_nodemask()!

Paul, is there any reason why we need to do a write_lock() on
tasklist_lock if we're just trying to block fork, or is it just
historical accident? Wouldn't it be fine to do a read_lock()?

Paul