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docs/vm: page_owner: convert to ReST format

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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
1 changed files with 23 additions and 15 deletions
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38
Documentation/vm/page_owner.txt
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@ -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. 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. 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 label patching functionality is available. Following is the kernel's code
size change due to this facility. 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
text data bss dec hex filename 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 1427 24 8 1459 5b3 mm/page_ext.o
2722 50 0 2772 ad4 mm/page_owner.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 page extension feature. Anyway, after that, no page is left in
un-tracking state. un-tracking state.
* Usage Usage
=====
1) Build user-space helper::
1) Build user-space helper
cd tools/vm cd tools/vm
make page_owner_sort make page_owner_sort
2) Enable page owner 2) Enable page owner: add "page_owner=on" to boot cmdline.
Add "page_owner=on" to boot cmdline.
3) Do the job what you want to debug 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 cat /sys/kernel/debug/page_owner > page_owner_full.txt
grep -v ^PFN page_owner_full.txt > page_owner.txt grep -v ^PFN page_owner_full.txt > page_owner.txt
./page_owner_sort page_owner.txt sorted_page_owner.txt ./page_owner_sort page_owner.txt sorted_page_owner.txt
See the result about who allocated each page See the result about who allocated each page
in the sorted_page_owner.txt. in the ``sorted_page_owner.txt``.