linux-kernel - [PATCH 0/2] fix MADV_COLLAPSE issue if THP settings are disabled

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Message-ID: <cover.1748506520.git.baolin.wang@linux.alibaba.com>
Date: Thu, 29 May 2025 16:23:53 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	hughd@...gle.com,
	david@...hat.com
Cc: lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com,
	npache@...hat.com,
	ryan.roberts@....com,
	dev.jain@....com,
	ziy@...dia.com,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] fix MADV_COLLAPSE issue if THP settings are disabled

As we discussed in the previous thread [1], the MADV_COLLAPSE will ignore
the system-wide anon/shmem THP sysfs settings, which means that even though
we have disabled the anon/shmem THP configuration, MADV_COLLAPSE will still
attempt to collapse into a anon/shmem THP. This violates the rule we have
agreed upon: never means never. This patch set will address this issue.

[1] https://lore.kernel.org/all/1f00fdc3-a3a3-464b-8565-4c1b23d34f8d@linux.alibaba.com/

Baolin Wang (2):
  mm: huge_memory: disallow hugepages if the system-wide THP sysfs
    settings are disabled
  mm: shmem: disallow hugepages if the system-wide shmem THP sysfs
    settings are disabled

 include/linux/huge_mm.h | 23 +++++++++++++++++++----
 mm/huge_memory.c        |  2 +-
 mm/shmem.c              | 12 ++++++------
 3 files changed, 26 insertions(+), 11 deletions(-)

-- 
2.43.5