Commit f227e04e authored by Mike Rapoport's avatar Mike Rapoport Committed by Jonathan Corbet

docs/vm: page_owner: convert to ReST format

Signed-off-by: default avatarMike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 1b7599b5
.. _page_owner:
==================================================
page owner: Tracking about who allocated each page
-----------------------------------------------------------
==================================================
* Introduction
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.
......@@ -34,11 +38,13 @@ 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
- Without page owner::
text data bss dec hex filename
40662 1493 644 42799 a72f mm/page_alloc.o
- With page owner
- 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
......@@ -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.
in the ``sorted_page_owner.txt``.
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