linux-kernel - [PATCH v3] Documentation/mm/page_owner.rst: delete frequently changing experimental data

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Date:   Wed,  5 Oct 2022 19:38:55 +0800
From:   Yixuan Cao <caoyixuan2019@...il.szu.edu.cn>
To:     bagasdotme@...il.com
Cc:     akiyks@...il.com, akpm@...ux-foundation.org,
        caoyixuan2019@...il.szu.edu.cn, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        rppt@...nel.org, skhan@...uxfoundation.org,
        yejiajian2018@...il.szu.edu.cn, zhangyinan2019@...il.szu.edu.cn
Subject: [PATCH v3] Documentation/mm/page_owner.rst: delete frequently changing experimental data

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, Mike Rapoport and
Bagas Sanjaya's constructive suggestions.

Signed-off-by: Yixuan Cao <caoyixuan2019@...il.szu.edu.cn>
---
 Documentation/mm/page_owner.rst | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/Documentation/mm/page_owner.rst b/Documentation/mm/page_owner.rst
index f18fd8907049..127514955a5e 100644
--- a/Documentation/mm/page_owner.rst
+++ b/Documentation/mm/page_owner.rst
@@ -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
-- 
2.17.1