Re: [PATCH] cgroup/dmem: implement dmem.high soft limit and throttling

[Qiliang Yuan]

Hello Maarten,

On Thu, May 21, 2026 at 09:45 AM Maarten Lankhorst wrote:
> It's the approach I'm more worried about. I believe that it's
> better if we punish exceeding their high limit by preferentially
> evicting those.
> 
> It would make eviction run in 3 passes on the affected cgroup tree:
> - Round 1: Clients above their 'high' limit
> - Round 2: Clients above their 'low/min' limits
> - Round 3: Clients at or below their 'low' limit

Thank you for this concrete suggestion. This 3-pass eviction model is 
exactly what's needed to make the dmem soft limit effective.

It addresses the core problem of providing a viable "recovery action" when 
the limit is reached. By integrating these thresholds directly into the 
TTM/dmem eviction weight calculation, we can achieve a more natural 
over-subscription model.

I will rework the series for v2 to incorporate this hierarchy-aware 
eviction logic.

Kind regards,
~Qiliang