Re: [RFC PATCH v3 0/5] mm, bpf: BPF based THP adjustment

[Usama Arif <usamaarif642@gmail.com>]

On 08/06/2025 08:35, Yafang Shao wrote:
> Background
> ----------
> 
> We have consistently configured THP to "never" on our production servers
> due to past incidents caused by its behavior:
> 
> - Increased memory consumption
>   THP significantly raises overall memory usage.
> 
> - Latency spikes
>   Random latency spikes occur due to more frequent memory compaction
>   activity triggered by THP.
> 
> - Lack of Fine-Grained Control
>   THP tuning knobs are globally configured, making them unsuitable for
>   containerized environments. When different workloads run on the same
>   host, enabling THP globally (without per-workload control) can cause
>   unpredictable behavior.
> 
> Due to these issues, system administrators remain hesitant to switch to
> "madvise" or "always" modes—unless finer-grained control over THP
> behavior is implemented.
> 

Would this solution work and be carried over in fork+exec? As that is something
which is very common. How would that look like?