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> Emm, after checked the code again, it seems you are= right. But this can not explain why i got inaccurate demotion statistics f= rom /proc/vmstat compared to the value i counted in the code myself days ag= o.

Well... I know what was going on, the second pass will override stat-=A3=BE= nr_demoted to be *zero* that makes the first try  stat-=A3=BEnr_d= emoted got lost.




=B7=A2=BC=FE=C8=CB: Li, Zhijian/= =C0=EE =D6=C7=BC=E1 <lizhijian@fujitsu.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2025=C4=EA1=D4=C210=C8=D5=D0=C7= =C6=DA=CE=E5 22:20
=CA=D5=BC=FE=C8=CB: Kaiyang Zhao
=B3=AD=CB=CD: linux-mm@kvack.org; Andrew Morton; linux-ker= nel@vger.kernel.org
=D6=F7=CC=E2: Re: [PATCH 1/2] mm/vmscan: Accumulate nr_dem= oted for accurate demotion statistics

=A3=BE It looks like demotion will only be attempted once. On the second pa= ss,
do_demote_pass will be false, demote_folios will be empty and
demote_folio_list() will do nothing. But I guess there is no harm in making nr_demoted  an accumulation for less confusion in the future...=


Emm, after checked the code again, it seems you are right= . But this can not explain why i got inaccurate demotion statistics from /p= roc/vmstat compared to the value i counted in the code myself days ago.

thanks for your feedback, i will take a look next week.

Get Outlook for Android

=B7=A2=BC=FE=C8=CB: Kaiyang Zhao= <kaiyang2@cs.cmu.edu>
=B7=A2=CB=CD=CA=B1=BC=E4: 2025=C4=EA1=D4=C210=C8=D5=D0=C7= =C6=DA=CE=E5 20:50
=CA=D5=BC=FE=C8=CB: Li, Zhijian/=C0=EE =D6=C7=BC=E1
=B3=AD=CB=CD: linux-mm@kvack.org; Andrew Morton; linux-ker= nel@vger.kernel.org
=D6=F7=CC=E2: Re: [PATCH 1/2] mm/vmscan: Accumulate nr_dem= oted for accurate demotion statistics

On Fri, Jan 10, 2025 at 08:21:32PM +0800, Li Zhiji= an wrote:
> In the shrink_folio_list() function, demote_folio_list() can be called=
> multiple times, which can lead to inaccurate demotion statistics if th= e
> number of demoted pages is not accumulated correctly.

It looks like demotion will only be attempted once. On the second pass,
do_demote_pass will be false, demote_folios will be empty and
demote_folio_list() will do nothing. But I guess there is no harm in
making nr_demoted  an accumulation for less confusion in the future...=


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