linux-kernel - [PATCH 0/2] fs/proc/task_mmu: add guard region bit to pagemap

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Message-ID: <cover.1740139449.git.lorenzo.stoakes@oracle.com>
Date: Fri, 21 Feb 2025 12:05:21 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Matthew Wilcox <willy@...radead.org>, Vlastimil Babka <vbabka@...e.cz>,
        "Paul E . McKenney" <paulmck@...nel.org>, Jann Horn <jannh@...gle.com>,
        Juan Yescas <jyescas@...gle.com>, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: [PATCH 0/2] fs/proc/task_mmu: add guard region bit to pagemap

Currently there is no means of determining whether a give page in a mapping
range is designated a guard region (as installed via madvise() using the
MADV_GUARD_INSTALL flag).

This is generally not an issue, but in some instances users may wish to
determine whether this is the case.

This series adds this ability via /proc/$pid/pagemap, updates the
documentation and adds a self test to assert that this functions correctly.

Lorenzo Stoakes (2):
  fs/proc/task_mmu: add guard region bit to pagemap
  tools/selftests: add guard region test for /proc/$pid/pagemap

 Documentation/admin-guide/mm/pagemap.rst   |  3 +-
 fs/proc/task_mmu.c                         |  6 ++-
 tools/testing/selftests/mm/guard-regions.c | 47 ++++++++++++++++++++++
 tools/testing/selftests/mm/vm_util.h       |  1 +
 4 files changed, 55 insertions(+), 2 deletions(-)

--
2.48.1