Re: [PATCH] mm,memcg: provide per-cgroup counters for NUMA balancing operations

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On Mon, Aug 12, 2024 at 10:09:55PM -0700, David Rientjes wrote:
> Does this include top-tier specific memory limits as well?

Yes, we plan to have top-tier specific memory protection (like memory.low)
and memory limit (like memory.high). Exactly what the interface will
look like will probably depends on the community feedback. Maybe it's
just adding a memory_top_tier.low/high knob, maybe something else.

> And is your primary motivation the promotion path through NUMA Balancing 
> or are you also looking at demotion to develop a comprehensive policy for 
> memory placement using these limits?

Both promotion and demotion/reclaim path. If we want top-tier memory
protection and limit, moderating both promotion and demotion is I think
a must for converging on a stable distribution of memory usage on top-tier
and slower tier.

Kaiyang




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