Re: [RFC PATCH 0/6] mm/memcontrol: Make memcg limits tier-aware

Kaiyang Zhao
2026-02-24T20:04:11Z

On Tue, Feb 24, 2026 at 01:49:21PM -0500, Gregory Price wrote:
>
> >
> > > Is this typical in real life configurations?
> >
> > I would say so. I think that the two examples above are realistic
> > scenarios that cloud providers and hyperscalers might face on tiered systems.
> >
>
> The answer is unequivocally yes.
>
> Lacking tier-awareness is actually a huge blocker for deploying mixed
> workloads on large, dense memory systems with multiple tiers (2+).

Hello! I'm the author of the RFC in 2024. Just want to add that we've
recently released a preprint paper on arXiv that includes case studies
with a few of Meta's production workloads using a prototype version of
the patches.

The results confirmed that co-colocated workloads can have working set
sizes exceeding the limited top-tier memory capacity given today's
server memory shapes and workload stacking settings, causing contention
of top-tier memory. Workloads see significant variations in tail
latency and throughput depending on the share of top-tier tier memory
they get, which this patch set will alleviate.

Best,
Kaiyang

[1] https://arxiv.org/pdf/2602.08800