[RFC PATCH v2 00/12] Make MAX_ORDER adjustable as a kernel boot time parameter.

[Zi Yan]

From: Zi Yan <ziy@xxxxxxxxxx>

Hi all,

This patchset adds support for kernel boot time adjustable MAX_ORDER, so that
user can change the largest size of pages buddy allocator allocates.
It is on top of mm-everything-2022-08-11-02-10.

Motivation
===

This enables kernel to allocate 1GB pages and is necessary for my ongoing work
on adding support for 1GB PUD THP[1]. This is also the conclusion I came up with
after some discussion with David Hildenbrand on what methods should be used for
allocating gigantic pages[2], since other approaches like using CMA allocator or
alloc_contig_pages() are regarded as suboptimal.

In addition, make MAX_ORDER a kernel boot time parameter can enable user to
adjust buddy allocator without recompiling the kernel for their own needs, so
that one can still have a small MAX_ORDER if he/she does not need to allocate
gigantic pages like 1GB PUD THPs.

Background
===

At the moment, kernel imposes MAX_ORDER - 1 + PAGE_SHFIT < SECTION_SIZE_BITS
restriction. This prevents buddy allocator merging pages across memory sections,
as PFNs might not be contiguous and code like page++ would fail. But this would
not be an issue when SPARSEMEM_VMEMMAP is set, since all struct page are
virtually contiguous. So boot time adjustable MAX_ORDER depends on
SPARSEMEM_VMEMMAP.

Description
===

I tested the patchset on both x86_64 and ARM64 at 4KB base pages. The systems
boot and run. It definitely needs more tests and reviews.

In terms of the concerns on performance degradation if MAX_ORDER is increased,
I run vm-scalability from lkp comparing current system, my patchset with
MAX_ORDER=11 and my patchset with MAX_ORDER=20 on a x86_64 VM and saw
almost no performance difference, please attached vm-scalability reports.

Patch 1 renames FORCE_MAX_ZONEORDER to ARCH_FORCE_MAX_ORDER for a more
precise description.

Patch 2 changes MAX_ORDER to represent the max order of pages allocated
by buddy allocator. right now MAX_ORDER - 1 represents that and it is
confusing. Suggested by Vlastimil Babka.

Patch 3 replaces MAX_ORDER with MAX_PHYS_CONTIG_ORDER when it is used to
indicate the maximum number of physically contiguous pages.

Patch 4 fixes deferred struct page initialization when MAX_ORDER is
bigger than a memory section size.

Patch 5-8 convert the use of MAX_ORDER to pageblock_order. Since
pageblock_order is a constant when MAX_ORDER can be changed at boot time
and close to current MAX_ORDER value. I separate changes to different patches
for easy review and can merge them into a single one if that works better.

Patch 9 adds a new Kconfig option SET_MAX_ORDER to allow specifying MAX_ORDER
when ARCH_FORCE_MAX_ORDER is not used by the arch, like x86_64.

Patch 10 converts statically allocated arrays with MAX_ORDER length to dynamic
ones if possible and prepares for making MAX_ORDER a boot time parameter.

Patch 11 adds a new MIN_MAX_ORDER constant to replace soon-to-be-dynamic
MAX_ORDER for places where converting static array to dynamic one is causing
hassle and not necessary, i.e., ARM64 hypervisor page allocation and SLAB.

Patch 12 changes MAX_ORDER to be a kernel boot time parameter and it is
opt-in as an mm/Kconfig option.


Any suggestion and/or comment is welcome. Thanks.


[1] https://lore.kernel.org/linux-mm/20200928175428.4110504-1-zi.yan@xxxxxxxx/
[2] https://lore.kernel.org/linux-mm/e132fdd9-65af-1cad-8a6e-71844ebfe6a2@xxxxxxxxxx/

Performance comparison
====

Only the changed stats is shown below. If you do not see some stats,
they are the same across three.

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/small-allocs/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
   1266004            -0.3%    1262674            +1.1%    1279441        vm-scalability.median

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/small-allocs-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
     76016            +0.2%      76178            +1.2%      76936        vm-scalability.median
   1216312            +0.2%    1218252            +1.2%    1231465        vm-scalability.throughput
 3.653e+08            +0.2%  3.659e+08            +1.3%  3.701e+08        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/mmap-xread-seq-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
   1574020 ±  2%      +0.1%    1576169            -2.3%    1537232 ±  2%  vm-scalability.median
  25184277 ±  2%      +0.1%   25218477            -2.3%   24595646 ±  2%  vm-scalability.throughput
 7.567e+09 ±  2%      +0.1%  7.575e+09            -2.3%  7.395e+09 ±  2%  vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/mmap-pread-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      2.28 ± 11%     -21.0%       1.80 ± 11%     -18.2%       1.87 ± 11%  vm-scalability.free_time
      8.58 ±  9%      +3.4       11.95 ±  7%      +1.1        9.69 ± 13%  vm-scalability.stddev%
   1541489            -0.2%    1539102            +1.3%    1561678        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/mmap-pread-rand-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
     94376            +0.4%      94716            +1.8%      96103        vm-scalability.median
     12.96 ±  3%     +11.9       24.88 ± 80%      +0.3       13.30 ±  5%  vm-scalability.stddev%
   1509455            +0.8%    1522093            +1.8%    1536886        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/lru-file-readtwice/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    433656            -5.3%     410460 ±  2%      -4.8%     412737        vm-scalability.median
  13879867            -5.5%   13118050 ±  2%      -4.8%   13212361        vm-scalability.throughput
 4.164e+09            -5.5%  3.935e+09 ±  2%      -4.8%  3.964e+09        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/lru-file-mmap-read/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    488915 ±  3%      -2.3%     477658 ±  6%     -11.7%     431771 ±  6%  vm-scalability.median
    120.69 ± 35%     -39.0       81.65 ± 84%     -89.1       31.56 ±154%  vm-scalability.stddev%
   8106774 ±  4%      -3.3%    7835670 ±  7%     -13.9%    6981078 ±  8%  vm-scalability.throughput
 2.435e+09 ±  4%      -3.4%  2.353e+09 ±  7%     -13.8%  2.099e+09 ±  8%  vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/anon-rx-rand-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    196783            -0.8%     195189 ±  2%      -2.8%     191323        vm-scalability.median
     53.88 ±  3%      -4.9       48.96 ±  2%     -43.9        9.95 ± 35%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/anon-r-seq-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
     50.03 ± 29%     -15.9       34.08 ± 12%      -2.4       47.66 ± 32%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/qemu-vm/anon-r-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      3.82            -0.8%       3.79            -0.6%       3.79 ±  3%  vm-scalability.free_time
    172116            +0.3%     172685            -2.1%     168557        vm-scalability.median
     75.53 ± 12%     -15.6       59.88 ± 13%     -60.9       14.64 ± 17%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/8T/qemu-vm/anon-wx-seq-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    798340            +0.8%     804861            -3.0%     774082        vm-scalability.median
      1.55 ± 28%      -0.1        1.47 ± 32%      +0.6        2.19 ± 14%  vm-scalability.median_stddev%
      1.55 ± 28%      -0.1        1.47 ± 32%      +0.6        2.19 ± 14%  vm-scalability.stddev%
  12773455            +0.8%   12877783            -3.0%   12385319        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/8T/qemu-vm/anon-w-seq/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      0.13            +4.1%       0.14 ±  3%     +37.0%       0.18        vm-scalability.free_time
    923091            -0.6%     917275 ±  2%      +3.7%     957298        vm-scalability.median
      4.57 ±  2%      -1.7        2.89 ± 15%      -3.9        0.68 ±  7%  vm-scalability.median_stddev%
  14811265            -0.5%   14731710            +1.8%   15079698        vm-scalability.throughput
 3.173e+09            -0.5%  3.156e+09 ±  2%      -1.2%  3.134e+09        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/8T/qemu-vm/anon-w-seq-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      0.07            +1.1%       0.07            +3.6%       0.07        vm-scalability.free_time
    667055            -1.6%     656481            -1.4%     657861        vm-scalability.median
      2.22 ±  4%      -0.1        2.12 ±  6%      +0.4        2.60 ± 14%  vm-scalability.median_stddev%
  10817276            -1.3%   10673638            -2.3%   10568517        vm-scalability.throughput
 2.022e+09            -1.0%  2.002e+09            -1.5%  1.991e+09        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/8T/qemu-vm/anon-cow-seq/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    475554            -0.5%     473278            +2.6%     487908        vm-scalability.median
      4.20 ±  2%      -1.5        2.73 ±  6%      -3.3        0.89 ±  6%  vm-scalability.median_stddev%
      3.58 ±  3%      -1.0        2.58 ±  5%      -1.7        1.88 ±  9%  vm-scalability.stddev%
   7533010            +0.4%    7559545            +1.7%    7663820        vm-scalability.throughput
 1.764e+09            +1.8%  1.795e+09            +1.2%  1.785e+09        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/8T/qemu-vm/anon-cow-seq-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      1.13 ± 14%      -0.3        0.85 ± 15%      -0.5        0.66 ± 32%  vm-scalability.median_stddev%
      1.13 ± 14%      -0.3        0.85 ± 15%      -0.5        0.66 ± 32%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/512G/qemu-vm/anon-wx-rand-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
     72308            -1.4%      71294 ±  3%      -7.9%      66569        vm-scalability.median
      0.96 ± 11%      -0.0        0.94 ± 14%      -0.5        0.44 ±  5%  vm-scalability.stddev%
 2.743e+08            -0.0%  2.743e+08           +12.7%   3.09e+08        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/512G/qemu-vm/anon-w-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      0.09            +0.8%       0.09 ±  3%      +5.9%       0.10 ±  3%  vm-scalability.free_time
     67458 ±  2%      -6.0%      63414 ±  2%     -11.3%      59805        vm-scalability.median
      4.66 ± 36%      +4.7        9.38 ± 34%      -2.2        2.50 ± 23%  vm-scalability.median_stddev%
    971866            -1.3%     959227            -2.3%     949434        vm-scalability.throughput
 2.469e+08            -0.0%  2.469e+08           +11.1%  2.743e+08        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/512G/qemu-vm/anon-w-rand-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      0.12 ±  2%      +2.8%       0.13           +10.5%       0.14 ±  3%  vm-scalability.free_time
     65926 ±  3%      -1.8%      64711 ±  4%      -9.3%      59770        vm-scalability.median
      4.51 ± 38%      +1.3        5.83 ± 48%      -3.1        1.44 ± 31%  vm-scalability.median_stddev%
      1.24 ± 24%      -0.3        0.93 ± 25%      -0.8        0.48 ± 17%  vm-scalability.stddev%
 2.395e+08            +1.5%  2.432e+08           +11.5%   2.67e+08        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/512G/qemu-vm/anon-cow-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
     63519 ±  3%      -2.3%      62074 ±  2%     -12.2%      55775        vm-scalability.median
    914972            -1.2%     904135            -2.4%     893097        vm-scalability.throughput
 2.323e+08            -0.0%  2.323e+08           +11.1%  2.582e+08        vm-scalability.workload

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/512G/qemu-vm/anon-cow-rand-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
     64719 ±  2%      -1.7%      63626 ±  2%      -7.4%      59953        vm-scalability.median
      3.32 ± 77%      +1.3        4.64 ± 64%      -2.3        1.02 ± 60%  vm-scalability.median_stddev%
      0.83 ± 27%      -0.1        0.74 ± 53%      -0.7        0.18 ± 43%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/2T/qemu-vm/shm-xread-seq/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    346505            +2.5%     355073            +1.8%     352797        vm-scalability.median
      1.29 ± 26%      +0.4        1.73 ± 11%      +0.2        1.47 ± 22%  vm-scalability.median_stddev%
      1.29 ± 26%      +0.4        1.73 ± 11%      +0.2        1.47 ± 22%  vm-scalability.stddev%
   5544053            +2.5%    5681145            +1.8%    5644734        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/2T/qemu-vm/shm-pread-seq/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      3.06           +10.8%       3.40           +11.5%       3.42        vm-scalability.free_time
    344737            +3.5%     356824            +2.0%     351766        vm-scalability.median
   5515773            +3.5%    5709150            +2.0%    5628245        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/2T/qemu-vm/shm-pread-seq-mt/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    363265            +2.4%     371881            +2.0%     370384        vm-scalability.median
   5807625            +2.4%    5948137            +2.0%    5922313        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/256G/qemu-vm/msync/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    124686 ±  4%      +2.9%     128345            +9.0%     135953        vm-scalability.median
     19.68 ±  9%      -1.2       18.47 ±  6%      -5.0       14.67 ±  3%  vm-scalability.median_stddev%
     18.87 ±  9%      -1.5       17.38 ±  9%      -6.1       12.76 ±  4%  vm-scalability.stddev%
   2047903 ±  2%      +2.1%    2090681            +4.4%    2138545        vm-scalability.throughput

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/256G/qemu-vm/lru-shm-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      0.03            -0.4%       0.03            -2.0%       0.02        vm-scalability.free_time
      7.02 ± 18%      +0.7        7.68 ± 12%      -5.4        1.65 ± 13%  vm-scalability.median_stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/1T/qemu-vm/lru-shm/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      2.36 ±  4%      -0.5        1.90 ± 13%      -1.6        0.80 ± 20%  vm-scalability.median_stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/16G/qemu-vm/shm-xread-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    168.32 ±  6%      -0.1      168.24 ± 17%    -114.4       53.94 ± 59%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/16G/qemu-vm/shm-pread-rand/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
    172.46 ±  8%     -14.2      158.30 ± 20%    -106.4       66.04 ± 74%  vm-scalability.stddev%

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase/unit_size:
  gcc-11/defconfig/debian/300s/16G/qemu-vm/shm-pread-rand-mt/vm-scalability/1G

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      0.06 ±  4%      +5.0%       0.07 ±  5%     +38.6%       0.09 ±  6%  vm-scalability.free_time

=========================================================================================
compiler/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-11/defconfig/debian/300s/128G/qemu-vm/truncate-seq/vm-scalability

commit: 
  5.19.0-rc4-mm-everything+
  5.19.0-rc4-boot-time-max-order-10+
  5.19.0-rc4-boot-time-max-order-20+

5.19.0-rc4-mm-ev 5.19.0-rc4-boot-time-max-or 5.19.0-rc4-boot-time-max-or 
---------------- --------------------------- --------------------------- 
         %stddev     %change         %stddev     %change         %stddev
             \          |                \          |                \  
      9.00 ± 15%      +1.6       10.59 ± 11%      -2.6        6.35 ±  8%  vm-scalability.median_fault_stddev%
      9.00 ± 15%      +1.6       10.59 ± 11%      -2.6        6.35 ±  8%  vm-scalability.stddev_fault%


Zi Yan (12):
  arch: mm: rename FORCE_MAX_ZONEORDER to ARCH_FORCE_MAX_ORDER
  mm: rectify MAX_ORDER semantics to be the largest page order from
    buddy allocator
  mm: replace MAX_ORDER when it is used to indicate max physical
    contiguity.
  mm: adapt deferred struct page init to new MAX_ORDER.
  mm: prevent pageblock size being larger than section size.
  fs: proc: use pageblock_nr_pages for reschedule period in read_kcore()
  virtio: virtio_balloon: use pageblock_order instead of MAX_ORDER
  mm/page_reporting: set page_reporting_order to -1 to prevent it
    running
  mm: Make MAX_ORDER of buddy allocator configurable via Kconfig
    SET_MAX_ORDER.
  mm: convert MAX_ORDER sized static arrays to dynamic ones.
  mm: introduce MIN_MAX_ORDER to replace MAX_ORDER as compile time
    constant.
  mm: make MAX_ORDER a kernel boot time parameter.

 .../admin-guide/kdump/vmcoreinfo.rst          |   4 +-
 .../admin-guide/kernel-parameters.txt         |   9 +-
 arch/Kconfig                                  |   4 +
 arch/arc/Kconfig                              |   6 +-
 arch/arm/Kconfig                              |  14 +-
 arch/arm/configs/imx_v6_v7_defconfig          |   2 +-
 arch/arm/configs/milbeaut_m10v_defconfig      |   2 +-
 arch/arm/configs/oxnas_v6_defconfig           |   2 +-
 arch/arm/configs/sama7_defconfig              |   2 +-
 arch/arm64/Kconfig                            |  18 ++-
 arch/arm64/include/asm/sparsemem.h            |   2 +-
 arch/arm64/kvm/hyp/include/nvhe/gfp.h         |   2 +-
 arch/arm64/kvm/hyp/nvhe/page_alloc.c          |   2 +-
 arch/csky/Kconfig                             |   4 +-
 arch/ia64/Kconfig                             |  10 +-
 arch/ia64/include/asm/sparsemem.h             |   6 +-
 arch/ia64/mm/hugetlbpage.c                    |   2 +-
 arch/m68k/Kconfig.cpu                         |  10 +-
 arch/mips/Kconfig                             |  24 ++--
 arch/nios2/Kconfig                            |  12 +-
 arch/powerpc/Kconfig                          |  32 ++---
 arch/powerpc/configs/85xx/ge_imp3a_defconfig  |   2 +-
 arch/powerpc/configs/fsl-emb-nonhw.config     |   2 +-
 arch/powerpc/mm/book3s64/iommu_api.c          |   2 +-
 arch/powerpc/mm/hugetlbpage.c                 |   2 +-
 arch/powerpc/platforms/powernv/pci-ioda.c     |   2 +-
 arch/sh/configs/ecovec24_defconfig            |   2 +-
 arch/sh/mm/Kconfig                            |  22 ++-
 arch/sparc/Kconfig                            |  10 +-
 arch/sparc/kernel/pci_sun4v.c                 |   2 +-
 arch/sparc/kernel/traps_64.c                  |   2 +-
 arch/sparc/mm/tsb.c                           |   4 +-
 arch/um/kernel/um_arch.c                      |   4 +-
 arch/xtensa/Kconfig                           |  10 +-
 drivers/base/regmap/regmap-debugfs.c          |   8 +-
 drivers/crypto/hisilicon/sgl.c                |   6 +-
 .../gpu/drm/i915/gem/selftests/huge_pages.c   |   2 +-
 drivers/gpu/drm/ttm/ttm_device.c              |   7 +-
 drivers/gpu/drm/ttm/ttm_pool.c                |  72 ++++++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |   2 +-
 drivers/irqchip/irq-gic-v3-its.c              |   4 +-
 drivers/md/dm-bufio.c                         |   2 +-
 drivers/misc/genwqe/card_utils.c              |   2 +-
 drivers/net/ethernet/ibm/ibmvnic.h            |   2 +-
 drivers/video/fbdev/hyperv_fb.c               |   6 +-
 drivers/virtio/virtio_balloon.c               |   2 +-
 drivers/virtio/virtio_mem.c                   |   8 +-
 fs/proc/kcore.c                               |   2 +-
 fs/ramfs/file-nommu.c                         |   2 +-
 include/drm/ttm/ttm_pool.h                    |   4 +-
 include/linux/hugetlb.h                       |   2 +-
 include/linux/mmzone.h                        |  36 ++++-
 include/linux/pageblock-flags.h               |  21 ++-
 include/linux/slab.h                          |   8 +-
 kernel/crash_core.c                           |   2 +-
 kernel/dma/pool.c                             |   8 +-
 mm/Kconfig                                    |  33 ++++-
 mm/compaction.c                               |   8 +-
 mm/debug_vm_pgtable.c                         |   4 +-
 mm/huge_memory.c                              |   2 +-
 mm/hugetlb.c                                  |   4 +-
 mm/internal.h                                 |  10 +-
 mm/memblock.c                                 |   8 +-
 mm/memory.c                                   |   4 +-
 mm/memory_hotplug.c                           |   6 +-
 mm/page_alloc.c                               | 128 +++++++++++++-----
 mm/page_isolation.c                           |  14 +-
 mm/page_owner.c                               |   6 +-
 mm/page_reporting.c                           |   8 +-
 mm/shuffle.h                                  |   2 +-
 mm/slab.c                                     |   2 +-
 mm/slub.c                                     |   6 +-
 mm/vmscan.c                                   |   1 -
 mm/vmstat.c                                   |  14 +-
 net/smc/smc_ib.c                              |   2 +-
 scripts/checkpatch.pl                         |   8 ++
 security/integrity/ima/ima_crypto.c           |   2 +-
 tools/testing/memblock/linux/mmzone.h         |   6 +-
 78 files changed, 451 insertions(+), 270 deletions(-)

-- 
2.35.1