On Sun, Oct 24, 2010 at 6:07 PM, Li Zefan <lizf@xxxxxxxxxxxxxx> wrote: > > Paul had a patch to allow some subsystems to be added to multi-hierarchies, > which may help. I more or less dropped it since I couldn't see a big use for it - all the examples I had were more easily implemented as basic cgroup control files (and hence available in all hierarchies automatically) > But it forbids accessing t->cgroups, which makes this > feature of limited use. Not exactly - it meant that you couldn't do a fast dereference via t->cgroups to get to your cgroup_subsys_state, since there was no longer a unique css for each task for that subsystem - there would be one per mounted instance of the subsystem. Instead it became necessary to follow a chain of pointers to find the appropriate css for the hierarchy in question. In general this also means that it's harder for the multi-bound subsystem have any real-world meaning - it's mostly useful for stateless subsystems, or ones where the cgroup_subsys_state contents have no direct connection with machine-wide data. Paul _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
