Re: [RFC][PATCH 2/2] memcg: hardwall hierarhcy for memcg

[Li Zefan <lizf@cn.fujitsu.com>]

KAMEZAWA Hiroyuki wrote:
> Hard-Wall hierarchy support for memcg.
>  - new member hierarchy_model is added to memcg.
> 
> Only root cgroup can modify this only when there is no children.
> 
> Adds following functions for supporting HARDWALL hierarchy.
>  - try to reclaim memory at the change of "limit".
>  - try to reclaim all memory at force_empty
>  - returns resources to the parent at destroy.
> 
> Changelog v2->v3
>  - added documentation.
>  - hierarhcy_model parameter is added.
> 
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> 
> ---
>  Documentation/controllers/memory.txt |   27 +++++-
>  mm/memcontrol.c                      |  156 ++++++++++++++++++++++++++++++++++-
>  2 files changed, 178 insertions(+), 5 deletions(-)
> 
> Index: temp-2.6.26-rc2-mm1/mm/memcontrol.c
> ===================================================================
> --- temp-2.6.26-rc2-mm1.orig/mm/memcontrol.c
> +++ temp-2.6.26-rc2-mm1/mm/memcontrol.c
> @@ -137,6 +137,8 @@ struct mem_cgroup {
>  	struct mem_cgroup_lru_info info;
>  
>  	int	prev_priority;	/* for recording reclaim priority */
> +
> +	int	hierarchy_model; /* used hierarchical policy */

hierarchy_model can be a global value instead of per cgroup value.