Re: [PATCH v2 1/3] sched/numa: make free-space tiering promotion bypass configurable

[Bharata B Rao]

On 29-Oct-26 5:03 PM, Li Zhe wrote:
> Yes, the case I am trying to cover is closer to the non-overcommitted
> case.  We do have deployments where memory is intentionally placed across
> DRAM and CXL memory, instead of relying only on natural spillover from a
> full top tier.
> 
> For example, the orchestration layer may want a cgroup to use a planned
> DRAM/CXL ratio, so that DRAM capacity remains available for later
> placement decisions or other workloads.
> 
> In such setups, the top tier can still have free space, but we may not
> want short cold accesses to refill it simply because the free-space
> bypass is available.  The intent of this patch is to let those
> deployments keep using the existing hotness and rate-limit checks even
> when there is top-tier headroom.

Thanks for this information about the deployment model. This is a useful
conclusion to reach.

Regards,
Bharata.