Re: [PATCH v6 mm-new 00/10] mm, bpf: BPF based THP order selection

[Yafang Shao <laoar.shao@gmail.com>]

On Tue, Aug 26, 2025 at 5:52 PM Usama Arif <usamaarif642@gmail.com> wrote:
>
>
>
> On 26/08/2025 08:42, David Hildenbrand wrote:
> > On 26.08.25 09:19, Yafang Shao wrote:
> >> Background
> >> ==========
> >>
> >> Our production servers consistently configure THP to "never" due to
> >> historical incidents caused by its behavior. Key issues include:
> >> - Increased Memory Consumption
> >>    THP significantly raises overall memory usage, reducing available memory
> >>    for workloads.
> >>
> >> - Latency Spikes
> >>    Random latency spikes occur due to frequent memory compaction triggered
> >>    by THP.
> >>
> >> - Lack of Fine-Grained Control
> >>    THP tuning is globally configured, making it unsuitable for containerized
> >>    environments. When multiple workloads share a host, enabling THP without
> >>    per-workload control leads to unpredictable behavior.
> >>
> >> Due to these issues, administrators avoid switching to madvise or always
> >> modes—unless per-workload THP control is implemented.
> >>
> >> To address this, we propose BPF-based THP policy for flexible adjustment.
> >> Additionally, as David mentioned [0], this mechanism can also serve as a
> >> policy prototyping tool (test policies via BPF before upstreaming them).
> >
> > There is a lot going on and most reviewers (including me) are fairly busy right now, so getting more detailed review could take a while.
> >
> > This topic sounds like a good candidate for the bi-weekly MM alignment session.
> >
> > Would you be interested in presenting the current bpf interface, how to use it,  drawbacks, todos, ... in that forum?
> >
>
> Could I get an invite please? Thanks!

IIUC, a Google Meet link will be shared publicly on the upstream
mailing list, allowing any interested developers to join. If the
session is invite-only instead, I will make sure you receive an
invitation, given the significant help you've already provided for
this series.

-- 
Regards
Yafang