Re: [PATCH 4/5] mm: memcontrol: move remote memcg charging APIs to CONFIG_MEMCG_KMEM

[Roman Gushchin]

On Mon, Mar 01, 2021 at 07:43:27PM -0800, Shakeel Butt wrote:
> On Mon, Mar 1, 2021 at 5:16 PM Roman Gushchin <guro@xxxxxx> wrote:
> >
> > On Mon, Mar 01, 2021 at 02:22:26PM +0800, Muchun Song wrote:
> > > The remote memcg charing APIs is a mechanism to charge kernel memory
> > > to a given memcg. So we can move the infrastructure to the scope of
> > > the CONFIG_MEMCG_KMEM.
> >
> > This is not a good idea, because there is nothing kmem-specific
> > in the idea of remote charging, and we definitely will see cases
> > when user memory is charged to the process different from the current.
> >
> 
> Indeed and which remind me: what happened to the "Charge loop device
> i/o to issuing cgroup" series? That series was doing remote charging
> for user pages.

Yeah, this is exactly what I minded. We're using it internally, and as I
remember there were no obstacles to upstream it too.
I'll ping Dan when after the merge window.

Thanks!