KAMEZAWA Hiroyuki wrote:
> Counting active/inactive per-zone in memory controller.
> 
> This patch adds per-zone status in memory cgroup.
> These values are often read (as per-zone value) by page reclaiming.
> 
> In current design, per-zone stat is just a unsigned long value and 
> not an atomic value because they are modified only under lru_lock.
> (for avoiding atomic_t ops.)
> 
> This patch adds ACTIVE and INACTIVE per-zone status values.
> 
> For handling per-zone status, this patch adds
>   struct mem_cgroup_per_zone {
> 		...
>   }
> and some helper functions. This will be useful to add per-zone objects
> in mem_cgroup.
> 
> This patch turns memory controller's early_init to be 0 for calling 
> kmalloc().
> 
> Changelog V1 -> V2
>   - added mem_cgroup_per_zone struct.
>       This will help following patches to implement per-zone objects and
>       pack them into a struct.
>   - added __mem_cgroup_add_list() and __mem_cgroup_remove_list()
>   - fixed page migration handling.
>   - renamed zstat to info (per-zone-info)
>     This will be place for per-zone information(lru, lock, ..)
>   - use page_cgroup_nid()/zid() funcs.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

The code looks OK to me, pending test on a real NUMA box

Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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