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mm: fix docs for the kernel parameter `thp_anon=`

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If we add ``thp_anon=32,64K:always`` to the kernel command line, we
will see the following error:

[    0.000000] huge_memory: thp_anon=32,64K:always: error parsing string, ignoring setting

This happens because the correct format isn't ``thp_anon=<size>,<size>[KMG]:<state>```,
as [KMG] must follow each number to especify its unit. So, the correct
format is ``thp_anon=<size>[KMG],<size>[KMG]:<state>```.

Therefore, adjust the documentation to reflect the correct format of the
parameter ``thp_anon=``.

Link: https://lkml.kernel.org/r/20241101165719.1074234-3-mcanal@igalia.com
Fixes: dd4d30d1cd ("mm: override mTHP "enabled" defaults at kernel cmdline")
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Acked-by: Barry Song <baohua@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Maíra Canal 2024-11-01 13:54:05 -03:00 committed by Andrew Morton
parent 4401e9d10a
commit 652e1a5146
2 changed files with 2 additions and 2 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -6688,7 +6688,7 @@
0: no polling (default) 0: no polling (default)
thp_anon= [KNL] thp_anon= [KNL]
Format: <size>,<size>[KMG]:<state>;<size>-<size>[KMG]:<state> Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
state is one of "always", "madvise", "never" or "inherit". state is one of "always", "madvise", "never" or "inherit".
Control the default behavior of the system with respect Control the default behavior of the system with respect
to anonymous transparent hugepages. to anonymous transparent hugepages.

2
Documentation/admin-guide/mm/transhuge.rst
View File

@ -303,7 +303,7 @@ control by passing the parameter ``transparent_hugepage=always`` or
kernel command line. kernel command line.
Alternatively, each supported anonymous THP size can be controlled by Alternatively, each supported anonymous THP size can be controlled by
passing ``thp_anon=<size>,<size>[KMG]:<state>;<size>-<size>[KMG]:<state>``, passing ``thp_anon=<size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>``,
where ``<size>`` is the THP size (must be a power of 2 of PAGE_SIZE and where ``<size>`` is the THP size (must be a power of 2 of PAGE_SIZE and
supported anonymous THP) and ``<state>`` is one of ``always``, ``madvise``, supported anonymous THP) and ``<state>`` is one of ``always``, ``madvise``,
``never`` or ``inherit``. ``never`` or ``inherit``.