Re: [PATCH v1 11/26] mm: page_io: prevent memory cgroup release in page_io module

[Qi Zheng]

On 11/19/25 5:26 PM, Harry Yoo wrote:
> On Tue, Oct 28, 2025 at 09:58:24PM +0800, Qi Zheng wrote:
> > From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> >
> > In the near future, a folio will no longer pin its corresponding
> > memory cgroup. To ensure safety, it will only be appropriate to
> > hold the rcu read lock or acquire a reference to the memory cgroup
> > returned by folio_memcg(), thereby preventing it from being released.
> >
> > In the current patch, the rcu read lock is employed to safeguard
> > against the release of the memory cgroup in swap_writepage() and
>
> nit:                                          ^ swap_writeout()

will fix it.

> > bio_associate_blkg_from_page().
> >
> > This serves as a preparatory measure for the reparenting of the
> > LRU pages.
> >
> > Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> > Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
> > ---
>
> Looks good to me,
> Reviewed-by: Harry Yoo <harry.yoo@xxxxxxxxxx>

Thanks!

>