[PATCH v1 05/29] mm/balloon_compaction: make PageOffline sticky until the page is freed
Lorenzo Stoakes
lorenzo.stoakes at oracle.com
Tue Jul 1 02:17:39 AEST 2025
On Mon, Jun 30, 2025 at 12:14:01PM -0400, Zi Yan wrote:
> On 30 Jun 2025, at 12:01, Lorenzo Stoakes wrote:
>
> > On Mon, Jun 30, 2025 at 02:59:46PM +0200, David Hildenbrand wrote:
> >> Let the page freeing code handle clearing the page type.
> >
> > Why is this advantageous? We want to keep the page marked offline for longer?
> >
> >>
> >> Acked-by: Zi Yan <ziy at nvidia.com>
> >> Acked-by: Harry Yoo <harry.yoo at oracle.com>
> >> Signed-off-by: David Hildenbrand <david at redhat.com>
> >
> > On assumption this UINT_MAX stuff is sane :)) I mean this is straightforward I
> > guess:
>
> This is how page type is cleared.
> See: https://elixir.bootlin.com/linux/v6.15.4/source/include/linux/page-flags.h#L1013.
Doh did go looking there but missed this!
I hate these macros so much. Almost designed to obfuscate.
>
> I agree with you that patch 4 should have a comment in free_pages_prepare()
> about what the code is for and why UINT_MAX is used.
Thx!
>
>
> Best Regards,
> Yan, Zi
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