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 Original line Diff line number Diff line
@@ -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