[Devel] Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

[Paul Menage]

On 3/7/07, Srivatsa Vaddagiri <vatsa at in.ibm.com> wrote:
> If that is the case, I think we can push container_lock entirely inside
> cpuset.c and not have others exposed to this double-lock complexity.
> This is possible because cpuset.c (build on top of containers) still has
> cpuset->parent and walking cpuset->parent list safely can be made
> possible with a second lock which is local to only cpuset.c.
>

The callback mutex (which is what container_lock() actually locks) is
also used to synchronize fork/exit against subsystem additions, in the
event that some subsystem has registered fork or exit callbacks. We
could probably have a separate subsystem_mutex for that instead.

Apart from that, yes, it may well be possible to move callback lock
entirely inside cpusets.

Paul