Hello, Christoph. On Wed, May 24, 2017 at 10:41:38AM -0700, Christoph Hellwig wrote: > > But how do you map that back to the cgroup without scanning the cgroup > > hierarchy? > > I'm totally lost on why you would do that. So maybe you just need > to send the full patch so that reviewers get the full picture.
Here's a simple scenario. Let's say blktrace now exposes the cgroup inode and generation numbers per trace. Userland tool now wants to show that in a human readable format but it can only map back the inode and generation numbers to the path by scanning the cgroup tree. So, the goal is having a token which is not path which uniquely identifies a cgroup and the ability to map that back to cgroup path. We can add a dedicated interface to cgroup root, for example, and allow querying by echoing inode and generation numbers into it but that's kinda clumsy. Thanks. -- tejun
