>> For example, I'm trying to fix a race. See https://lkml.org/lkml/2016/8/8/900 >> >> And the fix kind of relies on the fact that cgroup_post_fork() is placed >> inside the read section of cgroup_threadgroup_rwsem, so that cpuset_fork() >> won't race with cgroup migration. >> > > My patch retains that behaviour, before ss->fork() is called we hold > the cgroup_threadgroup_rwsem, in fact it is held prior to ss->can_fork() > I read the patch again and now I see only threadgroup_change_begin() is moved downwards, and threadgroup_change_end() remains intact. Then I have no problem with it. Acked-by: Zefan Li <lizefan@xxxxxxxxxx> -- 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>