docs/vm: page_owner: convert to ReST format

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mike Rapoport 2018-03-21 21:22:35 +02:00 committed by Jonathan Corbet
parent 1b7599b5de
commit f227e04e90

View File

@ -1,7 +1,11 @@
page owner: Tracking about who allocated each page
-----------------------------------------------------------
.. _page_owner:
* Introduction
==================================================
page owner: Tracking about who allocated each page
==================================================
Introduction
============
page owner is for the tracking about who allocated each page.
It can be used to debug memory leak or to find a memory hogger.
@ -34,13 +38,15 @@ not affect to allocation performance, especially if the static keys jump
label patching functionality is available. Following is the kernel's code
size change due to this facility.
- Without page owner
text data bss dec hex filename
40662 1493 644 42799 a72f mm/page_alloc.o
- Without page owner::
- With page owner
text data bss dec hex filename
40892 1493 644 43029 a815 mm/page_alloc.o
40662 1493 644 42799 a72f mm/page_alloc.o
- With page owner::
text data bss dec hex filename
40892 1493 644 43029 a815 mm/page_alloc.o
1427 24 8 1459 5b3 mm/page_ext.o
2722 50 0 2772 ad4 mm/page_owner.o
@ -62,21 +68,23 @@ are catched and marked, although they are mostly allocated from struct
page extension feature. Anyway, after that, no page is left in
un-tracking state.
* Usage
Usage
=====
1) Build user-space helper::
1) Build user-space helper
cd tools/vm
make page_owner_sort
2) Enable page owner
Add "page_owner=on" to boot cmdline.
2) Enable page owner: add "page_owner=on" to boot cmdline.
3) Do the job what you want to debug
4) Analyze information from page owner
4) Analyze information from page owner::
cat /sys/kernel/debug/page_owner > page_owner_full.txt
grep -v ^PFN page_owner_full.txt > page_owner.txt
./page_owner_sort page_owner.txt sorted_page_owner.txt
See the result about who allocated each page
in the sorted_page_owner.txt.
See the result about who allocated each page
in the ``sorted_page_owner.txt``.