Re: [RFC PATCH 0/4] mm, bpf: BPF based THP adjustment

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

On Tue, Apr 29, 2025 at 11:11 AM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Tue, Apr 29, 2025 at 10:41:35AM +0800, Yafang Shao wrote:
> > In our container environment, we aim to enable THP selectively—allowing
> > specific services to use it while restricting others. This approach is
> > driven by the following considerations:
> >
> > 1. Memory Fragmentation
> >    THP can lead to increased memory fragmentation, so we want to limit its
> >    use across services.
>
> What?  That's precisely wrong.  _not_ using THPs increases
> fragmentation.

It appears my previous explanation about memory fragmentation wasn't
clear enough.
To clarify, when I mention "memory fragmentation" in the context of
THP, I'm specifically referring to how it can increase memory
compaction activity. Additionally, I should have mentioned another
significant drawback of THP: memory wastage.

-- 
Regards
Yafang