On Fri, Sep 11, 2015 at 03:00:19PM -0400, Tejun Heo wrote: > It wasn't explicitly documented but, when a process is being migrated, > cpuset and memcg depend on cgroup_taskset_first() returning the > threadgroup leader; however, this approach is somewhat ghetto and > would no longer work for the planned multi-process migration. > > This patch introduces explicit cgroup_taskset_for_each_leader() which > iterates over only the threadgroup leaders and replaces > cgroup_taskset_first() usages for accessing the leader with it. > > This prepares both memcg and cpuset for multi-process migration. This > patch also updates the documentation for cgroup_taskset_for_each() to > clarify the iteration rules and removes comments mentioning task > ordering in tasksets. > > v2: A previous patch which added threadgroup leader test was dropped. > Patch updated accordingly. > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Acked-by: Zefan Li <lizefan@xxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxx> Michal, if you're okay with this patch, I'll apply the patchset in cgroup/for-4.4. Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>