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docs: mm: fix the incorrect 'FileHugeMapped' field

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The '/proc/PID/smaps' does not have the 'FileHugeMapped' field to count
the file transparent huge pages, instead, the 'FilePmdMapped' field should
be used.  Fix it.

Link: https://lkml.kernel.org/r/d520ce3aba2b03b088be30bece732426a939049a.1734425264.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2024-12-17 16:55:39 +08:00 committed by Andrew Morton
parent 4d9b90df2e
commit 472098f233
1 changed files with 1 additions and 1 deletions
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2
Documentation/admin-guide/mm/transhuge.rst
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@ -436,7 +436,7 @@ AnonHugePmdMapped).
The number of file transparent huge pages mapped to userspace is available The number of file transparent huge pages mapped to userspace is available
by reading ShmemPmdMapped and ShmemHugePages fields in ``/proc/meminfo``. by reading ShmemPmdMapped and ShmemHugePages fields in ``/proc/meminfo``.
To identify what applications are mapping file transparent huge pages, it To identify what applications are mapping file transparent huge pages, it
is necessary to read ``/proc/PID/smaps`` and count the FileHugeMapped fields is necessary to read ``/proc/PID/smaps`` and count the FilePmdMapped fields
for each mapping. for each mapping.
Note that reading the smaps file is expensive and reading it Note that reading the smaps file is expensive and reading it