linux-kernel - [RFC 0/3] mm: introduce snapshot

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Message-ID: <cover.1750170418.git.luizcap@redhat.com>
Date: Tue, 17 Jun 2025 10:27:07 -0400
From: Luiz Capitulino <luizcap@...hat.com>
To: david@...hat.com,
	willy@...radead.org
Cc: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	lcapitulino@...il.com,
	shivankg@....com
Subject: [RFC 0/3] mm: introduce snapshot_page()

Hi,

This series introduces snapshot_page(), a helper function that can be used
to create a snapshot of a struct page and its associated struct folio.

This function is intended to help callers with a consistent view of a
a folio while reducing the chance of encountering partially updated or
inconsistent state, such as during folio splitting which could lead to
crashes and BUG_ON()s being triggered.

This series is on top of latest Linus tree (9afe652958c3).

Luiz Capitulino (3):
  mm: introduce snapshot_page()
  proc: kpagecount: use snapshot_page()
  fs: stable_page_flags(): use snapshot_page()

 fs/proc/page.c     | 46 ++++++++++++++++++++----------
 include/linux/mm.h | 20 +++++++++++++
 mm/debug.c         | 42 +++------------------------
 mm/util.c          | 71 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 126 insertions(+), 53 deletions(-)

-- 
2.49.0