Re: [PATCH 1/9 v2] cgroup: add cgroup_subsys->post_create()
(2012/11/08 2:15), Tejun Heo wrote: 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. Signed-off-by: Tejun Heo Acked-by: Michal Hocko Cc: Glauber Costa Reviewed-by: KAMEZAWA Hiroyuki -- 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/
Re: [PATCH 1/9 v2] cgroup: add cgroup_subsys->post_create()
On Wed 07-11-12 09:15:08, Tejun Heo wrote: [...] > 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. Thanks -- Michal Hocko SUSE Labs -- 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/
Re: [PATCH 1/9 v2] cgroup: add cgroup_subsys-post_create()
On Wed 07-11-12 09:15:08, Tejun Heo wrote: [...] 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. Thanks -- Michal Hocko SUSE Labs -- 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/
Re: [PATCH 1/9 v2] cgroup: add cgroup_subsys-post_create()
(2012/11/08 2:15), Tejun Heo wrote: 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. Signed-off-by: Tejun Heo t...@kernel.org Acked-by: Michal Hocko mho...@suse.cz Cc: Glauber Costa glom...@parallels.com Reviewed-by: KAMEZAWA Hiroyuki kamezawa.hir...@jp.fujitsu.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/
