Re: [PATCH v1 0/4] Enable >0 order folio memory compaction

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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
>>>> ===
>>>>
>>>> =========================================================================================
>>>> compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
>>>>   gcc-13/defconfig/debian/300s/qemu-vm/mmap-xread-seq-mt/vm-scalability
>>>>
>>>> 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-migration-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 ±  5%      +1.1%   13033951            -0.4%   12845698        vm-scalability.throughput
>>>
>>> Hi Zi,
>>>
>>> Are you able to add any commentary to these results as I'm struggling to
>>> interpret them; Is a positive or negative change better (are they times 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. Some %stddev
>> are not present since they are too small. For 6.6.0-rc4-folio-migration-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 suggested 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.

I am preparing v2 and will send it out soon.

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-13/defconfig/debian/300s/qemu-vm/mmap-xread-seq-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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
  13041962           +16.1%   15142976            +5.0%   13690666 ±  6%      +6.7%   13920441            +5.5%   13762582        vm-scalability.throughput

=========================================================================================
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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
  14998168            -1.0%   14852803            -0.7%   14890569            -0.3%   14946766            -0.4%   14943302        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-13/defconfig/debian/300s/qemu-vm/lru-file-readtwice/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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
   6750930 ±  7%     +41.5%    9549570 ±  2%     +31.6%    8883545 ±  2%     +33.1%    8982606 ±  2%     +30.7%    8821667 ±  3%  vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-13/defconfig/debian/300s/qemu-vm/lru-file-mmap-read/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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
   5818610 ± 14%     +43.1%    8329118 ±  2%     +26.0%    7331427 ±  4%     +23.2%    7170418 ±  4%     +22.8%    7147458 ±  4%  vm-scalability.throughput

=========================================================================================
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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
   1973808            -0.2%    1969617            -0.5%    1964376            +0.3%    1979245            +1.0%    1993677        vm-scalability.throughput

=========================================================================================
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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
    479486            +0.3%     481036            +0.0%     479580            +2.3%     490310            +1.6%     487107        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-13/defconfig/debian/300s/512G/qemu-vm/anon-cow-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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
    453237            +1.2%     458580            +0.5%     455455            +2.6%     464830            +2.6%     465211        vm-scalability.throughput

=========================================================================================
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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
   1074404 ±  5%     +78.7%    1920268           +78.7%    1920270           +77.2%    1903612           +78.0%    1912223        vm-scalability.throughput

=========================================================================================
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         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \          |                \          |                \
   2568988            +5.3%    2706227            +5.3%    2706214            +6.3%    2729716            +5.3%    2704539        vm-scalability.throughput


--
Best Regards,
Yan, Zi

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