Commit 13564f7b authored by Baolin Wang's avatar Baolin Wang Committed by Euler
Browse files

docs: mm: fix the incorrect 'FileHugeMapped' field 

mainline inclusion
from mainline-v6.13-rc1
commit 472098f23323c39cc6269d7b7bf76cba62830a4c
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IBGFBA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=472098f23323c39cc6269d7b7bf76cba62830a4c

--------------------------------

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: default avatarBaolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarWang Lian <dev01404@linx-info.com>
---
parent 5c093a1c

Documentation/admin-guide/mm/transhuge.rst

+1 −1
Original line number Diff line number Diff line
@@ -436,7 +436,7 @@ AnonHugePmdMapped). 
The number of file transparent huge pages mapped to userspace is available

by reading ShmemPmdMapped and ShmemHugePages fields in ``/proc/meminfo``.

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.



Note that reading the smaps file is expensive and reading it