Re: [PATCH v3 0/8] mm/page_owner: Add PID/TGID/COMM and cgroup filtering

[Lorenzo Stoakes (ARM)]

On Fri, Sep 11, 2026 at 01:06:46PM +0200, David Hildenbrand (Arm) wrote:
> On 9/11/26 09:58, zhen.ni wrote:
> >
> >
> > 在 2026/9/9 23:54, Zi Yan 写道:
> >> On 9 Sep 2026, at 6:28, David Hildenbrand (Arm) wrote:
> >>
> >>>
> >>> Because it results in less kernel code  :)
> >>>
> >>> And less kernel code is good. Unless unavoidable.
> >>
> >> An alternative is to add BPF hooks like bpf_iter to do the filtering
> >> and by default, when no BPF program is attached, everything is printed.
> >>
> >>
> >
> > I’ve also thought about a similar approach—perhaps a new bpf_iter type
> > that could iterate over all pages by PFN. The advantage would be that
> > you can fully customize what you want to print and what you want to
> > filter. However, doing so would require refactoring the entire
> > page_owner, and I’m not sure whether it’s worth pursuing in this
> > direction.I’d also like to hear everyone’s thoughts on this.
>
> Certainly better than having more and more manual filters added to the code base.

Agreed.

bpf seems the ideal fit here I think?

Means that those who want this information can get it and those who don't are
unaffected.

>
> --
> Cheers,
>
> David

--
Cheers, Lorenzo