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