Re: [PATCH v3 1/4] mm/page_isolation: make page isolation a standalone bit.

[Johannes Weiner]

On Thu, May 08, 2025 at 04:22:43PM -0400, Zi Yan wrote:
> On 7 May 2025, at 17:10, Zi Yan wrote:
> 
> > During page isolation, the original migratetype is overwritten, since
> > MIGRATE_* are enums and stored in pageblock bitmaps. Change
> > MIGRATE_ISOLATE to be stored a standalone bit, PB_migrate_isolate, like
> > PB_migrate_skip, so that migratetype is not lost during pageblock
> > isolation. pageblock bits needs to be word aligned, so expand
> > the number of pageblock bits from 4 to 8 and make PB_migrate_isolate bit 7.
> >
> > Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>

> > ---
> >  include/linux/mmzone.h          | 17 ++++++++++----
> >  include/linux/page-isolation.h  |  2 +-
> >  include/linux/pageblock-flags.h | 33 +++++++++++++++++++++++++-
> >  mm/page_alloc.c                 | 41 ++++++++++++++++++++++++++++++++-
> >  4 files changed, 86 insertions(+), 7 deletions(-)
> >
> 
> Here is the fixup 1/3 to address Johannes’ comments.

Thanks!