On Wed, Feb 12, 2014 at 04:07:59PM -0500, Tejun Heo wrote: > cgroup_subsys->fork() callback is special in that it's called outside > the usual cgroup locking and may race with on-going migration. > freezer_fork() currently doesn't consider such race condition; > however, it is still correct thanks to the fact that freeze_task() may > be called spuriously. > > This is quite subtle. Let's explain what's going on and add test to > detect racing and losing to task migration and skip freeze_task() in > such cases for documentation. > > This doesn't make any behavior difference meaningful to userland. > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Cc: Li Zefan <lizefan@xxxxxxxxxx> > Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> Applied to cgroup/for-3.15. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
