Re: [PATCH 0/2] CGroups: cgroup member list enhancement/fix

Balbir Singh
2009-07-14T05:56:45Z

* menage@google.com <menage@google.com> [2009-07-13 09:26:26]:

> On Mon, Jul 13, 2009 at 5:11 AM, Balbir Singh<balbir@linux.vnet.ibm.com> wrote:
> >
> > How about lazy migration? Mark a group as to move when the kernel sees
> > it next for scheduling.
>
> Waiting for the next scheduling point might be too long, since a
> thread can block for arbitrary amounts of time and keeping the marker
> around for arbitrary time (unless we add a new task_struct field)
> would be tricky. Marking the cgroup or tgid as being migrated which
> then triggers the extra synchronization in the fork path (but which
> isn't needed at other times) is probably where we'll end up.

Hmm... but we would not need that information till we schedule the
tasks, adding a field to task_struct is what I had in mind.

--
Balbir