linux-kernel - Re: [PATCHv2 1/5] mm/page_vma_mapped: Track if the page is mapped across page table boundary

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Message-ID: <wnenjcqvr2lzqaqnxyc6tbtd7smv2hepajtjxl72kundsfaisk@k2mlxpzuzhbv>
Date: Mon, 22 Sep 2025 17:13:26 +0100
From: Kiryl Shutsemau <kirill@...temov.name>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	David Hildenbrand <david@...hat.com>, Hugh Dickins <hughd@...gle.com>, 
	Matthew Wilcox <willy@...radead.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, 
	Michal Hocko <mhocko@...e.com>, Rik van Riel <riel@...riel.com>, 
	Harry Yoo <harry.yoo@...cle.com>, Johannes Weiner <hannes@...xchg.org>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/5] mm/page_vma_mapped: Track if the page is mapped
 across page table boundary

On Fri, Sep 19, 2025 at 01:25:36PM -0700, Shakeel Butt wrote:
> On Fri, Sep 19, 2025 at 01:40:32PM +0100, Kiryl Shutsemau wrote:
> > From: Kiryl Shutsemau <kas@...nel.org>
> > 
> > Add a PVMW_PGTABLE_CROSSSED flag that page_vma_mapped_walk() will set if
> > the page is mapped across page table boundary. Unlike other PVMW_*
> > flags, this one is result of page_vma_mapped_walk() and not set by the
> > caller.
> > 
> > folio_referenced_one() will use it detect if it safe to mlock the folio.
> > 
> > Signed-off-by: Kiryl Shutsemau <kas@...nel.org>
> 
> Reviewed-by: Shakeel Butt <shakeel.butt@...ux.dev>
> 
> > ---
> >  include/linux/rmap.h | 5 +++++
> >  mm/page_vma_mapped.c | 1 +
> >  2 files changed, 6 insertions(+)
> > 
> > diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> > index 6cd020eea37a..04797cea3205 100644
> > --- a/include/linux/rmap.h
> > +++ b/include/linux/rmap.h
> > @@ -928,6 +928,11 @@ struct page *make_device_exclusive(struct mm_struct *mm, unsigned long addr,
> >  /* Look for migration entries rather than present PTEs */
> >  #define PVMW_MIGRATION		(1 << 1)
> >  
> > +/* Result flags */
> > +
> > +/* The page is mapped across page boundary */
> 
> I think you meant "page table boundary" in above comment.

Right. Will fix in the v3.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov