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From: Zi Yan <ziy@nvidia.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
 "\"Huang, Ying\"" <ying.huang@intel.com>,
 Ryan Roberts <ryan.roberts@arm.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>, 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 v2 0/3] Enable >0 order folio memory compaction
Date: Fri, 26 Jan 2024 09:22:01 -0500
Message-ID: <D47A9ED8-E537-4D2E-82FD-8E6A77ED5024@nvidia.com>
In-Reply-To: <f7d7eb0a-2bb3-4ae0-9874-7b667f8a004c@linux.alibaba.com>
References: <20240123034636.1095672-1-zi.yan@sent.com>
 <f7d7eb0a-2bb3-4ae0-9874-7b667f8a004c@linux.alibaba.com>
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On 26 Jan 2024, at 4:03, Baolin Wang wrote:

> On 1/23/2024 11:46 AM, Zi Yan wrote:
>> From: Zi Yan <ziy@nvidia.com>
>>
>> Hi all,
>>
>> This patchset enables >0 order folio memory compaction, which is one o=
f
>> the prerequisitions for large folio support[1]. It is on top of
>> mm-everything-2024-01-18-22-21.
>>
>> I am aware of that split free pages is necessary for folio
>> migration in compaction, since if >0 order free pages are never split
>> and no order-0 free page is scanned, compaction will end prematurely d=
ue
>> to migration returns -ENOMEM. Free page split becomes a must instead o=
f
>> an optimization.
>>
>> Some applications from vm-scalability show different performance trend=
s
>> on default LRU and CONFIG_LRU_GEN from patch 1 (split folio during com=
paction),
>> to patch 2 (folio migration during compaction), to patch 3 (folio
>> migration during compaction with free page split). I am looking into i=
t.
>>
>> lkp ncompare results (with >5% delta) for default LRU and CONFIG_LRU_G=
EN are
>> shown at the bottom (on a 8-CPU (Intel Xeon E5-2650 v4 @ 2.20GHz) 16G =
VM).
>
> Overall, I haven't found any obvious issues, thanks for your work. Howe=
ver I got some percentage regression when running thpcompact on my machin=
e(16 cores and 120G memory) without enabling mTHP:
>                                  k6.8-rc1               k6.8-rc1-patche=
d
> Percentage huge-1        86.19 (   0.00%)       51.17 ( -40.63%)
> Percentage huge-3        93.64 (   0.00%)       42.48 ( -54.64%)
> Percentage huge-5        94.93 (   0.00%)       31.06 ( -67.28%)
> Percentage huge-7        95.40 (   0.00%)       19.09 ( -79.99%)
> Percentage huge-12       93.51 (   0.00%)       32.06 ( -65.71%)
> Percentage huge-18       83.02 (   0.00%)       54.58 ( -34.26%)
> Percentage huge-24       83.17 (   0.00%)       49.61 ( -40.35%)
> Percentage huge-30       96.69 (   0.00%)       59.82 ( -38.13%)
> Percentage huge-32       95.52 (   0.00%)       59.20 ( -38.03%)
>
> Ops Compaction stalls                 229710.00      554846.00
> Ops Compaction success                144177.00        9351.00
> Ops Compaction failures                85533.00      545495.00
> Ops Compaction efficiency                 62.76           1.69
> Ops Page migrate success            60333689.00    11687573.00
> Ops Page migrate failure               25818.00      459621.00
> Ops Compaction pages isolated      127723211.00   224420997.00
> Ops Compaction migrate scanned     142498744.00   173345194.00
> Ops Compaction free scanned       1159752360.00   624633726.00
> Ops Compact scan efficiency               12.29          27.75
> Ops Compaction cost                    66050.96       17615.55
>
> I did not have time to analyze this issue, just providing you some test=
 information. And I will measure the compaction efficiency of mTHP if I f=
ind some time.

Thanks a lot. These are useful numbers. I can see that the number of
migration failures doubled and only ~1/5 of successes. I will use
thpcompact to look into the issues.


>
>>  From V1 [2]:
>> 1. Used folio_test_large() instead of folio_order() > 0. (per Matthew
>> Wilcox)
>>
>> 2. Fixed code rebase error. (per Baolin Wang)
>>
>> 3. Used list_split_init() instead of list_split(). (per Ryan Boberts)
>>
>> 4. Added free_pages_prepare_fpi_none() to avoid duplicate free page co=
de
>> in compaction_free().
>>
>> 5. Dropped source page order sorting patch.
>>
>>  From RFC [1]:
>> 1. Enabled >0 order folio compaction in the first patch by splitting a=
ll
>> to-be-migrated folios. (per Huang, Ying)
>>
>> 2. Stopped isolating compound pages with order greater than cc->order
>> to avoid wasting effort, since cc->order gives a hint that no free pag=
es
>> with order greater than it exist, thus migrating the compound pages wi=
ll fail.
>> (per Baolin Wang)
>>
>> 3. Retained the folio check within lru lock. (per Baolin Wang)
>>
>> 4. Made isolate_freepages_block() generate order-sorted multi lists.
>> (per Johannes Weiner)
>>
>> Overview
>> =3D=3D=3D
>>
>> To support >0 order folio compaction, the patchset changes how free pa=
ges used
>> for migration are kept during compaction. Free pages used to be split =
into
>> order-0 pages that are post allocation processed (i.e., PageBuddy flag=
 cleared,
>> page order stored in page->private is zeroed, and page reference is se=
t to 1).
>> Now all free pages are kept in a MAX_ORDER+1 array of page lists based=

>> on their order without post allocation process. When migrate_pages() a=
sks for
>> a new page, one of the free pages, based on the requested page order, =
is
>> then processed and given out.
>>
>>
>> Feel free to give comments and ask questions.
>>
>> Thanks.
>>
>> [1] https://lore.kernel.org/linux-mm/20230912162815.440749-1-zi.yan@se=
nt.com/
>> [2] https://lore.kernel.org/linux-mm/20231113170157.280181-1-zi.yan@se=
nt.com/
>>
>> vm-scalability results on CONFIG_LRU_GEN
>> =3D=3D=3D
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=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/small-allocs/vm-scalability
>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>     2024326           +35.5%    2743772 =C2=B1 41%    +364.0%    93921=
98 =C2=B1 35%     +31.0%    2651634        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/small-allocs-mt/vm-scalability=

>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>     1450189            +0.9%    1463418           +30.4%    1891610 =C2=
=B1 22%      +0.3%    1454100        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/mmap-xread-seq-mt/vm-scalabili=
ty
>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>    14428848 =C2=B1 27%     -51.7%    6963308 =C2=B1 73%     +13.5%   1=
6372621           +11.2%   16046511        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/mmap-pread-seq/vm-scalability
>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>    13569502 =C2=B1 24%     -45.9%    7340064 =C2=B1 59%     +12.3%   1=
5240531           +10.4%   14983705        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/mmap-pread-seq-mt/vm-scalabili=
ty
>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>    13305823 =C2=B1 24%     -45.1%    7299664 =C2=B1 56%     +12.5%   1=
4974725           +10.4%   14695963        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-readtwice/vm-scalabil=
ity
>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>    13244376 =C2=B1 28%     +54.2%   20425838 =C2=B1 23%      -4.4%   1=
2660113 =C2=B1  3%      -9.0%   12045809 =C2=B1  3%  vm-scalability.throu=
ghput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=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-scalabil=
ity
>>
>> commit:
>>    6.7.0-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>     7021425 =C2=B1 11%     -20.9%    5556751 =C2=B1 19%     +14.8%    =
8057811 =C2=B1  3%      +9.4%    7678613 =C2=B1  4%  vm-scalability.throu=
ghput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=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-rc4+
>>    6.7.0-rc4-split-folio-in-compaction+
>>    6.7.0-rc4-folio-migration-in-compaction+
>>    6.7.0-rc4-folio-migration-free-page-split+
>>
>>        6.7.0-rc4+ 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migratio=
n-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>     1208994 =C2=B1137%    +263.5%    4394683 =C2=B1 49%     -49.4%    =
 611204 =C2=B1  6%     -48.1%     627937 =C2=B1 13%  vm-scalability.throu=
ghput
>>
>>
>>
>> vm-scalability results on default LRU (with -no-mglru suffix)
>> =3D=3D=3D
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=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-scalabil=
ity
>>
>> commit:
>>    6.7.0-rc4-no-mglru+
>>    6.7.0-rc4-split-folio-in-compaction-no-mglru+
>>    6.7.0-rc4-folio-migration-in-compaction-no-mglru+
>>    6.7.0-rc4-folio-migration-free-page-split-no-mglru+
>>
>> 6.7.0-rc4-no-mgl 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migration=
-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>     8412072 =C2=B1  3%     +32.1%   11114537 =C2=B1 41%      +3.5%    =
8703491 =C2=B1  3%      +1.5%    8536343 =C2=B1  3%  vm-scalability.throu=
ghput
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=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-scalabil=
ity
>>
>> commit:
>>    6.7.0-rc4-no-mglru+
>>    6.7.0-rc4-split-folio-in-compaction-no-mglru+
>>    6.7.0-rc4-folio-migration-in-compaction-no-mglru+
>>    6.7.0-rc4-folio-migration-free-page-split-no-mglru+
>>
>> 6.7.0-rc4-no-mgl 6.7.0-rc4-split-folio-in-co 6.7.0-rc4-folio-migration=
-i 6.7.0-rc4-folio-migration-f
>> ---------------- --------------------------- -------------------------=
-- ---------------------------
>>           %stddev     %change         %stddev     %change         %std=
dev     %change         %stddev
>>               \          |                \          |                =
\          |                \
>>     7095358           +10.8%    7863635 =C2=B1 16%      +5.5%    74841=
10            +1.5%    7200666 =C2=B1  4%  vm-scalability.throughput
>>
>>
>> Zi Yan (3):
>>    mm/compaction: enable compacting >0 order folios.
>>    mm/compaction: add support for >0 order folio memory compaction.
>>    mm/compaction: optimize >0 order folio compaction with free page
>>      split.
>>
>>   mm/compaction.c | 218 ++++++++++++++++++++++++++++++++++------------=
--
>>   mm/internal.h   |   9 +-
>>   mm/page_alloc.c |   6 ++
>>   3 files changed, 169 insertions(+), 64 deletions(-)
>>


--
Best Regards,
Yan, Zi

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