Hey, Peter. On Fri, Jul 20, 2012 at 05:45:40PM +0200, Peter Zijlstra wrote: > > So, Peter, why does cpuset mangle with cgroup_mutex? What guarantees > > does it need? Why can't it work on "changed" notification while > > caching the current css like blkcg does? > > I've no clue sorry.. /me goes stare at this stuff.. Looks like something > Paul Menage did when he created cgroups. I'll have to have a hard look > at all that to untangle this. Not something obvious to me. Yeah, it would be great if this can be untangled. I really don't see any other reasonable way out of this circular locking mess. If cpuset needs stable css association across certain period, the RTTD is caching the css by holding its ref and synchronize modifications to that cache, rather than synchronizing cgroup operations themselves. Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>