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

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Message-ID: <ZB3n1pJZsOK+E/Zk@bombadil.infradead.org>
Date:   Fri, 24 Mar 2023 11:11:34 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     ye xingchen <yexingchen116@...il.com>
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, yzaikin@...gle.com
Subject: Re: [PATCH V5 1/2] mm: compaction: move compaction sysctl to its own
 file

On Fri, Mar 24, 2023 at 06:24:08AM +0000, ye xingchen wrote:
> >$ ./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.

  Luis