* menage@xxxxxxxxxx <menage@xxxxxxxxxx> [2009-07-10 16:58:23]: > On Sat, Jul 4, 2009 at 11:38 PM, Balbir Singh<balbir@xxxxxxxxxxxxxxxxxx> wrote: > > > > Paul, I don't see an interface to migrate all procs or at-least I > > can't read it in the changelog. As discussed in the containers > > mini-summit in 2008, it would be a nice thing to have (I've not looked > > at the implementation yet). > > > > We're still working on that bit. > > We want to provide the guarantee that if you write a tgid to the procs > file, all its threads get migrated even if you race with a clone() > call, and are trying to figure out a nice way to do that without > introducing unnecessary overhead/synchronization in the fork path. > How about lazy migration? Mark a group as to move when the kernel sees it next for scheduling. We'll still need synchronization, but we can amortize the cost. I've not tried it yet. BTW, we have quite a bit of logic in libcgroup to deal with migration problems, specially during classification, which Kenichi has added. We needed timestamping to get correct migration working during classification. -- Balbir _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
