Re: [PATCH] mm: memcg supports freeing the specified zone's memory

[Michal Hocko]

On Thu 16-01-25 22:22:42, Zhiguo Jiang wrote:
> Currently, the try_to_free_mem_cgroup_pages interface releases the
> memory occupied by the memcg, which defaults to all zones in the system.
> However, for multi zone systems, such as when there are both movable zone
> and normal zone, it is not possible to release memory that is only in
> the normal zone.
> 
> This patch is used to implement the try_to_free_mem_cgroup_pages interface
> to support for releasing the specified zone's memory occupied by the
> memcg in a multi zone systems, in order to optimize the memory usage of
> multiple zones.

Could you elaborate more on the actual usecase please? Who is going to
control which zone to reclaim from, how and why?

-- 
Michal Hocko
SUSE Labs