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SubjectRe: [PATCHSET cgroup/for-3.12] cgroup: decouple cgroup_subsys_state lifetime from that of cgroup
On 2013/8/9 4:13, Tejun Heo wrote:
> Hello,
>
> Currently a css's (cgroup_subsys_state) lifetime is tied to that of
> the cgroup it's attached to. css's are created when the cgroup is
> created and destroyed together. The access rules depend on it too -
> e.g. css's can be dereferenced while holding RCU read lock because
> cgroup is protected with RCU.
>
> With the planned unified hierarchy, we'll be dynamically creating and
> destroying css's through the lifetime of a cgroup, so we can no longer
> hitch css lifetime management onto cgroup's. This patchset separates
> out css lifetime management from that of cgroup. After the patchset,
> each css is individually RCU protected.
>
> This patchset contains the following 14 patches.
>
> 0001-cgroup-always-use-cgroup_css.patch
> 0002-cgroup-rename-cgroup_subsys_state-dput_work-and-its-.patch
> 0003-cgroup-add-cgroup_subsys_state-parent.patch
> 0004-cgroup-cgroup_css_from_dir-now-should-be-called-with.patch
> 0005-cgroup-make-cgroup_file_open-rcu_read_lock-around-cg.patch
> 0006-cgroup-add-__rcu-modifier-to-cgroup-subsys.patch
> 0007-cgroup-reorganize-css-init-exit-paths.patch
> 0008-cgroup-move-cgroup-subsys-assignment-to-online_css.patch
> 0009-cgroup-bounce-cgroup_subsys_state-ref-kill-confirmat.patch
> 0010-cgroup-replace-cgroup-css_kill_cnt-with-nr_css.patch
> 0011-cgroup-decouple-cgroup_subsys_state-destruction-from.patch
> 0012-cgroup-factor-out-kill_css.patch
> 0013-cgroup-move-subsys-file-removal-to-kill_css.patch
> 0014-cgroup-RCU-protect-each-cgroup_subsys_state-release.patch
>

Acked-by: Li Zefan <lizefan@huawei.com>



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