linux-kernel - Re: [PATCH V5 1/2] mm: compaction: move compaction sysctl to its own file

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Date:   Mon, 27 Mar 2023 02:49:39 +0000
From:   ye xingchen <yexingchen116@...il.com>
To:     mcgrof@...nel.org
Cc:     akpm@...ux-foundation.org, chi.minghao@....com.cn,
        hch@...radead.org, keescook@...omium.org, linmiaohe@...wei.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, vbabka@...e.cz, willy@...radead.org,
        ye.xingchen@....com.cn, yexingchen116@...il.com, yzaikin@...gle.com
Subject: Re: [PATCH V5 1/2] mm: compaction: move compaction sysctl to its own file

>> >$ ./scripts/bloat-o-meter vmlinux.old vmlinux
>> >add/remove: 1/0 grow/shrink: 1/2 up/down: 346/-350 (-4)
>> >Function                                     old     new   delta
>> >vm_compaction                                  -     320    +320
>> >kcompactd_init                               167     193     +26
>> >proc_dointvec_minmax_warn_RT_change          104      10     -94
>> >vm_table                                    2112    1856    -256
>> >Total: Before=19287558, After=19287554, chg -0.00%
>> >
>> >So I don't think we need to pause this move or others where are have savings.
>> >
>> >Minghao, can you fix the commit log, and explain how you are also saving
>> >4 bytes as per the above bloat-o-meter results?
>> 
>> $ ./scripts/bloat-o-meter vmlinux vmlinux.new
>> add/remove: 1/0 grow/shrink: 1/1 up/down: 350/-256 (94)
>> Function                                     old     new   delta
>> vm_compaction                                  -     320    +320
>> kcompactd_init                               180     210     +30
>> vm_table                                    2112    1856    -256
>> Total: Before=21104198, After=21104292, chg +0.00%
>> 
>> In my environment, kcompactd_init increases by 30 instead of 26.
>> And proc_dointvec_minmax_warn_RT_change No expansion.
>
>How about a defconfig + compaction enabled? Provide that information
>and let Vlastimal ACK/NACK the patch.
I use x86_defconfig and linux-next-20230327 branch
$ make defconfig;make all -j120
CONFIG_COMPACTION=y

add/remove: 1/0 grow/shrink: 1/1 up/down: 350/-256 (94)
Function                                     old     new   delta
vm_compaction                                  -     320    +320
kcompactd_init                               180     210     +30
vm_table                                    2112    1856    -256
Total: Before=21119987, After=21120081, chg +0.00%