Re: [RFC 0/6] mm: improve page allocator scalability via splitting zones

Huang, Ying
2023-05-29T01:14:47Z

Michal Hocko <mhocko@suse.com> writes:

> [Sorry for late reply, conferencing last 2 weeks and now catching up]

Never mind. And my reply is late too for sickness.

> On Tue 16-05-23 12:30:21, David Hildenbrand wrote:
> [...]
>> > And auto-tuning doesn't sound easy. Do you have some idea of how to do
>> > that?
>>
>> If we could avoid instantiating more zones and rather improve existing
>> mechanisms (PCP), that would be much more preferred IMHO. I'm sure it's not
>> easy, but that shouldn't stop us from trying ;)
>
> Absolutely agreed. Increasing the zone number sounds like a hack to me
> TBH. It seems like an easier way but it allows more subtle problems
> later on. E.g. hard to predict per-zone memory consumption and memory
> reclaim disbalances.

At least, we all think that improving PCP is something deserved to be
done. I will do some experiment on that and return to you (after some
time).

Best Regards,
Huang, Ying