[lkml]   [2019]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/3] mm: memcontrol: do not try to do swap when force empty

On 1/2/19 1:45 PM, Shakeel Butt wrote:
> On Wed, Jan 2, 2019 at 12:06 PM Yang Shi <> wrote:
>> The typical usecase of force empty is to try to reclaim as much as
>> possible memory before offlining a memcg. Since there should be no
>> attached tasks to offlining memcg, the tasks anonymous pages would have
>> already been freed or uncharged.
> Anon pages can come from tmpfs files as well.

Yes, but they are charged to swap space as regular anon pages.

>> Even though anonymous pages get
>> swapped out, but they still get charged to swap space. So, it sounds
>> pointless to do swap for force empty.
> I understand that force_empty is typically used before rmdir'ing a
> memcg but it might be used differently by some users. We use this
> interface to test memory reclaim behavior (anon and file).

Thanks for sharing your usecase. So, you uses this for test only?

> Anyways, I am not against changing the behavior, we can adapt
> internally but there might be other users using this interface
> differently.



> thanks,
> Shakeel

 \ /
  Last update: 2019-01-03 17:58    [W:0.081 / U:3.060 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site