Re: [PATCH 0/4] [RFC] Migrate Pages in lieu of discard

[Dave Hansen]

On 10/17/19 9:58 AM, Shakeel Butt wrote:
>> My expectation (and I haven't confirmed this) is that the any memory use
>> is accounted to the owning cgroup, whether it is DRAM or PMEM.  memcg
>> limit reclaim and global reclaim both end up doing migrations and
>> neither should have a net effect on the counters.
>>
> Hmm I didn't see the memcg charge migration in the code on demotion.
> So, in the code [patch 3] the counters are being decremented as DRAM
> is freed but not incremented for PMEM.

I had assumed that the migration code was doing this for me.  I'll go
make sure either way.