Re: [PATCH 00/11] mm/cma: charge cma allocation to memcg using per area counters

[Eric Chanudet]

On Mon, Aug 24, 2026 at 03:18:54PM +0200, Michal Koutný wrote:
> Hi Eric.
> 
> On Fri, Aug 21, 2026 at 02:56:52PM -0400, Eric Chanudet <echanude@xxxxxxxxxx> wrote:
> > Finally register the per-area usage counters in the cgroupfs. Each CMA
> > area creates a memory.cma.<area>.{current,max} pair for reporting and
> > limitation for each area.
> 
> These areas quite resemble dmem regions.
> What is the relation to the previous dmem double-charging [1]?
> (Successor, alternative,...)

They are, although I did not make it clear in the cover letter, my bad.

This is a CMA centric alternative to the other series that tried to
issue the memcg charge through dmem[1]. CMA seemed to better fit under
memcg directly as I couldn't find a solution on how to correctly charge
memcg once in dmem where it was determined to double-charge or not.

[1] https://lore.kernel.org/all/20260519-cgroup-dmem-memcg-double-charge-v2-0-db4d1407062b@xxxxxxxxxx/

> 
> Thanks,
> Michal



-- 
Eric Chanudet