On 2012/11/9 3:07, Tejun Heo wrote: > Subject: cgroup: add cgroup_subsys->post_create() > > Currently, there's no way for a controller to find out whether a new > cgroup finished all ->create() allocatinos successfully and is > considered "live" by cgroup. > > This becomes a problem later when we add generic descendants walking > to cgroup which can be used by controllers as controllers don't have a > synchronization point where it can synchronize against new cgroups > appearing in such walks. > > This patch adds ->post_create(). It's called after all ->create() > succeeded and the cgroup is linked into the generic cgroup hierarchy. > This plays the counterpart of ->pre_destroy(). > > When used in combination with the to-be-added generic descendant > iterators, ->post_create() can be used to implement reliable state > inheritance. It will be explained with the descendant iterators. > > v2: Added a paragraph about its future use w/ descendant iterators per > Michal. > > v3: Forgot to add ->post_create() invocation to cgroup_load_subsys(). > Fixed. > > Signed-off-by: Tejun Heo <t...@kernel.org> > Acked-by: Michal Hocko <mho...@suse.cz> > Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com> > Cc: Glauber Costa <glom...@parallels.com>
Li Zefan <lize...@huawei.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
