Commit 472098f2 authored by Baolin Wang's avatar Baolin Wang Committed by Andrew Morton
Browse files

docs: mm: fix the incorrect 'FileHugeMapped' field 

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>
parent 4d9b90df

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