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Message-ID: <d54d1dfb-f06d-4979-983b-73998f05867e@lucifer.local>
Date: Tue, 22 Jul 2025 06:34:08 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>,
Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
Jonathan Corbet <corbet@....net>, linux-mm@...ck.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] docs: update THP documentation to clarify sysfs "never"
setting
Hi Andrew,
Could you apply this fix-patch? It adds the caveat regarding MADV_COLLAPSE in a
couple other places whwere the sysfs 'never' mode is mentioned.
Thanks, Lorenzo
----8<----
>From 7c0bdda6a633bc38e7d5a3b0acf2cef7bdc961af Mon Sep 17 00:00:00 2001
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Date: Tue, 22 Jul 2025 06:32:18 +0100
Subject: [PATCH] docs: update admin guide transhuge page to mention
MADV_COLLAPSE everywhere
We previously missed a couple places where the 'never' mode was described,
put the caveat regarding MADV_COLLAPSE in these locations also.
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
Documentation/admin-guide/mm/transhuge.rst | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
index 182519197ef7..370fba113460 100644
--- a/Documentation/admin-guide/mm/transhuge.rst
+++ b/Documentation/admin-guide/mm/transhuge.rst
@@ -385,7 +385,9 @@ always
Attempt to allocate huge pages every time we need a new page;
never
- Do not allocate huge pages;
+ Do not allocate huge pages. Note that ``madvise(..., MADV_COLLAPSE)``
+ can still cause transparent huge pages to be obtained even if this mode
+ is specified everywhere;
within_size
Only allocate huge page if it will be fully within i_size.
@@ -441,7 +443,9 @@ inherit
have enabled="inherit" and all other hugepage sizes have enabled="never";
never
- Do not allocate <size> huge pages;
+ Do not allocate <size> huge pages. Note that ``madvise(...,
+ MADV_COLLAPSE)`` can still cause transparent huge pages to be obtained
+ even if this mode is specified everywhere;
within_size
Only allocate <size> huge page if it will be fully within i_size.
--
2.50.1
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