Messages in this thread | | | Date | Sun, 30 Oct 2011 18:18:46 +0100 | From | Lennart Poettering <> | Subject | Re: A Plumber’ s Wish List for Linux |
| |
On Tue, 25.10.11 13:40, Li Zefan (lizf@cn.fujitsu.com) wrote:
> > cgroups provides us with all of that, though the last two items only in > > a suboptimal way: notification of cgroups running empty is ugly, since > > it is done by spawning a usermode helper (we'd prefer a netlink msg or > > so), and the process killing is a bit racy. > > How about using eventfd? You can create an eventfd for the specific "tasks" > file, and when the cgroup gets empty (no task in it), you'll get a notification. > > It should be easy to implement, since cgroup already supports eventfd-based > API.
I am quite convinced that using eventfd() like this is quite ugly. The current evetnfd() logic is not recursive anyway, hence wouldn't help us much.
Lennart
-- Lennart Poettering - Red Hat, Inc.
| |