hi all：

In same case， I think it’s may be a problem。

if I create a virtual netdev device under mem cgroup(like ip link add ve_A type veth peer name ve_B).after that ,I destroy this mem cgroup。

I find that may the object  net_device, will be hold by the kernel until I run command (ip link del ). And the memory pages which container the object won’t be uncharge. mem_cgroup object  also will be not free. 

Anothers may think kernel just hold sizeof(struct netdev_device) memory size. But,it’s not really,it’s much bigger than they think.

It’s maybe a problems, I am not very sure about that.

 Thanks

bytedance.net
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duanxiongchun@bytedance.com




> On Nov 21, 2018, at 5:22 PM, dong <bauers@126.com> wrote:
> 
> Thanks for replying, Michal.
> 
> cc to duanxiongchun
> 
> 
> 
> 
> 
> 
> At 2018-11-21 17:10:41, "Michal Hocko" <mhocko@kernel.org> wrote:
> >On Wed 21-11-18 16:46:48, dong wrote:
> >> The last question: If I alloc many small pages and not free them, will
> >> I exhaust the memory ( because every page contains `mem_cgroup` )?
> >
> >No, the memory will get reclaimed on the memory pressure or for
> >anonymous one (malloc) when the process allocating it terminates,
> >-- 
> >Michal Hocko
> >SUSE Labs
> 
> 
>