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Documentation/mm/page_owner.rst: delete frequently changing experimental data

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The kernel size changes due to many factors, such as compiler
version, configuration, and the build environment. This makes
size comparison figures irrelevant to reader's setup.

Remove these figures and describe the effects of page owner
to the kernel size in general instead.

Thanks for Jonathan Corbet, Bagas Sanjaya and Mike Rapoport's
constructive suggestions.

Signed-off-by: Yixuan Cao <caoyixuan2019@email.szu.edu.cn>
Link: https://lore.kernel.org/r/20221005145525.10359-1-caoyixuan2019@email.szu.edu.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Yixuan Cao 2022-10-05 22:55:25 +08:00 committed by Jonathan Corbet
parent a0a6859f83
commit 0719fdba54
1 changed files with 4 additions and 16 deletions
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Documentation/mm/page_owner.rst
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@ -38,22 +38,10 @@ 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
48392 2333 644 51369 c8a9 mm/page_alloc.o
- With page owner::
text data bss dec hex filename
48800 2445 644 51889 cab1 mm/page_alloc.o
6662 108 29 6799 1a8f mm/page_owner.o
1025 8 8 1041 411 mm/page_ext.o
Although, roughly, 8 KB code is added in total, page_alloc.o increase by
520 bytes and less than half of it is in hotpath. Building the kernel with
page owner and turning it on if needed would be great option to debug
kernel memory problem.
Although enabling page owner increases kernel size by several kilobytes,
most of this code is outside page allocator and its hot path. Building
the kernel with page owner and turning it on if needed would be great
option to debug kernel memory problem.
There is one notice that is caused by implementation detail. page owner
stores information into the memory from struct page extension. This memory