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From: Zi Yan <ziy@nvidia.com>
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
 "\"Huang, Ying\"" <ying.huang@intel.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 "\"Matthew Wilcox (Oracle)\"" <willy@infradead.org>,
 David Hildenbrand <david@redhat.com>,
 "\"Yin, Fengwei\"" <fengwei.yin@intel.com>, Yu Zhao <yuzhao@google.com>,
 Vlastimil Babka <vbabka@suse.cz>,
 "\"Kirill A . Shutemov\"" <kirill.shutemov@linux.intel.com>,
 Johannes Weiner <hannes@cmpxchg.org>,
 Baolin Wang <baolin.wang@linux.alibaba.com>,
 Kemeng Shi <shikemeng@huaweicloud.com>,
 Mel Gorman <mgorman@techsingularity.net>,
 Rohan Puri <rohan.puri15@gmail.com>, Mcgrof Chamberlain <mcgrof@kernel.org>,
 Adam Manzanares <a.manzanares@samsung.com>,
 "\"Vishal Moola (Oracle)\"" <vishal.moola@gmail.com>
Subject: Re: [PATCH v1 0/4] Enable >0 order folio memory compaction
Date: Wed, 03 Jan 2024 10:51:43 -0500
Message-ID: <DFFD13A9-2578-4A57-AA46-068EEA77FBC4@nvidia.com>
In-Reply-To: <7acefbe0-9413-48fd-ad98-56fecc6f29da@arm.com>
References: <20231113170157.280181-1-zi.yan@sent.com>
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 <7ED1378A-AC39-48A2-8A2A-E06C7858DCE1@nvidia.com>
 <df51bbb7-f791-4747-9077-e9f7f37e9518@arm.com>
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On 3 Jan 2024, at 4:12, Ryan Roberts wrote:

> On 02/01/2024 20:50, Zi Yan wrote:
>> On 21 Nov 2023, at 12:11, Ryan Roberts wrote:
>>
>>> On 21/11/2023 16:45, Zi Yan wrote:
>>>> On 21 Nov 2023, at 10:46, Ryan Roberts wrote:
>>>>
>>>>>>
>>>>>> vm-scalability results
>>>>>> =3D=3D=3D
>>>>>>
>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>>>>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>>>>>   gcc-13/defconfig/debian/300s/qemu-vm/mmap-xread-seq-mt/vm-scalab=
ility
>>>>>>
>>>>>> commit:
>>>>>>   6.6.0-rc4-mm-everything-2023-10-21-02-40+
>>>>>>   6.6.0-rc4-split-folio-in-compaction+
>>>>>>   6.6.0-rc4-folio-migration-in-compaction+
>>>>>>   6.6.0-rc4-folio-migration-free-page-split+
>>>>>>   6.6.0-rc4-folio-migration-free-page-split-sort-src+
>>>>>>
>>>>>> 6.6.0-rc4-mm-eve 6.6.0-rc4-split-folio-in-co 6.6.0-rc4-folio-migra=
tion-i 6.6.0-rc4-folio-migration-f 6.6.0-rc4-folio-migration-f
>>>>>> ---------------- --------------------------- ---------------------=
------ --------------------------- ---------------------------
>>>>>>          %stddev     %change         %stddev     %change         %=
stddev     %change         %stddev     %change         %stddev
>>>>>>              \          |                \          |             =
   \          |                \          |                \
>>>>>>   12896955            +2.7%   13249322            -4.0%   12385175=
 =C2=B1  5%      +1.1%   13033951            -0.4%   12845698        vm-s=
calability.throughput
>>>>>
>>>>> Hi Zi,
>>>>>
>>>>> Are you able to add any commentary to these results as I'm struggli=
ng to
>>>>> interpret them; Is a positive or negative change better (are they t=
imes or
>>>>> rates?). What are the stddev values? The title suggests percent but=
 the values
>>>>> are huge - I'm trying to understand what the error bars look like -=
 are the
>>>>> swings real or noise?
>>>>
>>>> The metric is vm-scalability.throughput, so the larger the better. S=
ome %stddev
>>>> are not present since they are too small. For 6.6.0-rc4-folio-migrat=
ion-in-compaction+,
>>>> %stddev is greater than %change, so the change might be noise.
>>>
>>> Ahh got it - thanks!
>>>
>>>>
>>>> Also, I talked to DavidH in last THP Cabal meeting about this. He su=
ggested that
>>>> there are a lot of noise in vm-scalability like what I have here and=
 I should
>>>> run more iterations and on bare metal. I am currently rerun them on =
a baremetal
>>>> and more iterations on the existing VM and report the results later.=
 Please
>>>> note that the runs really take some time.
>>>
>>> Ahh ok, I'll wait for the bare metal numbers and will disregard these=
 for now.
>>> Thanks!
>>
>> It seems that the unexpected big mmap-pread-seq-mt perf drop came from=
 the mistake I
>> made in patch 1. After fixing that, mmap-pread-seq-mt perf only drops =
0.5%. The new
>> results on top of 6.7.0-rc1-mm-everything-2023-11-15-00-17 are at the =
end of the email.
>
> Good news! I don't see the results for mmap-pread-seq-mt below - perhap=
s you
> forgot to include it?

The stats below only shows significant changes and mmap-pread-seq-mt delt=
a is less
than 5%, thus it is not shown.

>
>>
>> I am preparing v2 and will send it out soon.
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/qemu-vm/mmap-xread-seq-mt/vm-scalabilit=
y
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>   13041962           +16.1%   15142976            +5.0%   13690666 =C2=
=B1  6%      +6.7%   13920441            +5.5%   13762582        vm-scala=
bility.throughput
>
> I'm still not sure I'm interpretting this correctly; is %change always =
relative
> to 6.7.0-rc1-mm-everything-2023-11-15-00-17 or is it relative to the pr=
evious
> commit?

The former, always relative to 6.7.0-rc1-mm-everything-2023-11-15-00-17.

>
> If the former, then it looks like splitting the folios is actually fast=
er than
> migrating them whole?

Yes, I will look into it when I am preparing the next version.

>
>
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/qemu-vm/mmap-pread-seq/vm-scalability
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>   14998168            -1.0%   14852803            -0.7%   14890569    =
        -0.3%   14946766            -0.4%   14943302        vm-scalabilit=
y.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/qemu-vm/lru-file-readtwice/vm-scalabili=
ty
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>    6750930 =C2=B1  7%     +41.5%    9549570 =C2=B1  2%     +31.6%    8=
883545 =C2=B1  2%     +33.1%    8982606 =C2=B1  2%     +30.7%    8821667 =
=C2=B1  3%  vm-scalability.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/qemu-vm/lru-file-mmap-read/vm-scalabili=
ty
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>    5818610 =C2=B1 14%     +43.1%    8329118 =C2=B1  2%     +26.0%    7=
331427 =C2=B1  4%     +23.2%    7170418 =C2=B1  4%     +22.8%    7147458 =
=C2=B1  4%  vm-scalability.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/qemu-vm/anon-r-rand/vm-scalability
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>    1973808            -0.2%    1969617            -0.5%    1964376    =
        +0.3%    1979245            +1.0%    1993677        vm-scalabilit=
y.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/512G/qemu-vm/anon-w-rand/vm-scalability=

>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>     479486            +0.3%     481036            +0.0%     479580    =
        +2.3%     490310            +1.6%     487107        vm-scalabilit=
y.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/512G/qemu-vm/anon-cow-rand/vm-scalabili=
ty
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>     453237            +1.2%     458580            +0.5%     455455    =
        +2.6%     464830            +2.6%     465211        vm-scalabilit=
y.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/256G/qemu-vm/msync/vm-scalability
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>    1074404 =C2=B1  5%     +78.7%    1920268           +78.7%    192027=
0           +77.2%    1903612           +78.0%    1912223        vm-scala=
bility.throughput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
>>   gcc-13/defconfig/debian/300s/256G/qemu-vm/msync-mt/vm-scalability
>>
>> commit:
>>   6.7.0-rc1-mm-everything-2023-11-15-00-17+
>>   6.7.0-rc1-split-folio-in-compaction+
>>   6.7.0-rc1-folio-migration-in-compaction+
>>   6.7.0-rc1-folio-migration-free-page-split+
>>   6.7.0-rc1-folio-migration-free-page-split-sort-src+
>>
>> 6.7.0-rc1-mm-eve 6.7.0-rc1-split-folio-in-co 6.7.0-rc1-folio-migration=
-i 6.7.0-rc1-folio-migration-f 6.7.0-rc1-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- --------------------------- ---------------------------
>>          %stddev     %change         %stddev     %change         %stdd=
ev     %change         %stddev     %change         %stddev
>>              \          |                \          |                \=
          |                \          |                \
>>    2568988            +5.3%    2706227            +5.3%    2706214    =
        +6.3%    2729716            +5.3%    2704539        vm-scalabilit=
y.throughput
>>
>>
>> --
>> Best Regards,
>> Yan, Zi


--
Best Regards,
Yan, Zi

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