On 2012/11/1 3:44, Tejun Heo wrote:
> CGRP_WAIT_ON_RMDIR is another kludge which was added to make cgroup
> destruction rollback somewhat working. cgroup_rmdir() used to drain
> CSS references and CGRP_WAIT_ON_RMDIR and the associated waitqueue and
> helpers were used to allow the task performing rmdir to wait for the
> next relevant event.
>
> Unfortunately, the wait is visible to controllers too and the
> mechanism got exposed to memcg by 887032670d ("cgroup avoid permanent
> sleep at rmdir").
>
> Now that the draining and retries are gone, CGRP_WAIT_ON_RMDIR is
> unnecessary. Remove it and all the mechanisms supporting it. Note
> that memcontrol.c changes are essentially revert of 887032670d
> ("cgroup avoid permanent sleep at rmdir").
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
> Cc: Balbir Singh <bsingharora@xxxxxxxxx>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> ---
> include/linux/cgroup.h | 21 ---------------------
> kernel/cgroup.c | 51 --------------------------------------------------
> mm/memcontrol.c | 24 +-----------------------
> 3 files changed, 1 insertion(+), 95 deletions(-)
Acked-by: Li Zefan <lizefan@xxxxxxxxxx>
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