linux-kernel - [BUG] numa spreading of large hash tables no longer a thing

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Date:   Fri, 24 Sep 2021 12:55:18 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: [BUG] numa spreading of large hash tables no longer a thing

Hi Andrew and mm experts

It seems recent kernels lost the NUMA spreading of large hash tables
allocated at boot time.

Does it ring a bell, was it intentional ?
Thanks

Old behavior
otrv5:~# grep alloc_large_system_hash /proc/vmallocinfo
0x000000006381d67a-0x000000009bc8465a   12288
alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1
0x000000009bc8465a-0x00000000b70c6dfc   12288
alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1
0x00000000b70c6dfc-0x00000000ab13330f   12288
alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1
0x000000008685d551-0x000000009ce0c789   12288
alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1
0x000000004d87acca-0x00000000781b44e4  266240
alloc_large_system_hash+0xf1/0x290 pages=64 vmalloc N0=32 N1=32
0x00000000dea0f2d2-0x00000000909e9fb3 268439552
alloc_large_system_hash+0xf1/0x290 pages=65536 vmalloc vpages N0=32768
N1=32768
0x00000000909e9fb3-0x00000000d23f4353  528384
alloc_large_system_hash+0xf1/0x290 pages=128 vmalloc N0=64 N1=64
0x00000000d23f4353-0x000000003913e8bc 134221824
alloc_large_system_hash+0xf1/0x290 pages=32768 vmalloc vpages N0=16384
N1=16384
0x000000003913e8bc-0x000000007a60bcd6 4198400
alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512
N1=512
0x000000007a60bcd6-0x0000000001bc8bf9 4198400
alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512
N1=512
0x0000000001bc8bf9-0x0000000022629b89 4198400
alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512
N1=512
0x0000000022629b89-0x0000000027d1b0a7 1052672
alloc_large_system_hash+0xf1/0x290 pages=256 vmalloc N0=128 N1=128
0x0000000027d1b0a7-0x0000000027310068 4198400
alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512
N1=512
0x0000000027310068-0x00000000a845050a 1052672
alloc_large_system_hash+0xf1/0x290 pages=256 vmalloc N0=128 N1=128
0x00000000a845050a-0x0000000028b8c1bc 2101248
alloc_large_system_hash+0xf1/0x290 pages=512 vmalloc N0=256 N1=256
0x0000000028b8c1bc-0x000000002aff2d3d 2101248
alloc_large_system_hash+0xf1/0x290 pages=512 vmalloc N0=256 N1=256

New behavior
otrv6:~# grep alloc_large_system_hash /proc/vmallocinfo
0x00000000de22dded-0x000000006574cf88   12288
alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2
0x000000006574cf88-0x00000000bc158a1d   12288
alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2
0x00000000afa304a2-0x0000000009981fb8   12288
alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2
0x00000000e3ab78c1-0x00000000ddbeadf2  528384
alloc_large_system_hash+0x18c/0x272 pages=128 vmalloc N0=128
0x0000000000cce551-0x0000000022096e73   12288
alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2
0x0000000072a43217-0x00000000cf0c05f7  266240
alloc_large_system_hash+0x18c/0x272 pages=64 vmalloc N0=64
0x000000003f85e695-0x0000000042154f88 268439552
alloc_large_system_hash+0x18c/0x272 pages=65536 vmalloc vpages
N0=65536
0x0000000042154f88-0x0000000066fcdca2 134221824
alloc_large_system_hash+0x18c/0x272 pages=32768 vmalloc vpages
N0=32768
0x0000000066fcdca2-0x000000004074129c 4198400
alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024
0x000000004074129c-0x00000000ca32b7f9 4198400
alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024
0x00000000ca32b7f9-0x00000000a56b8117 4198400
alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024
0x00000000a56b8117-0x0000000089e9e39e 2101248
alloc_large_system_hash+0x18c/0x272 pages=512 vmalloc N0=512
0x0000000089e9e39e-0x0000000090a80b5a 1052672
alloc_large_system_hash+0x18c/0x272 pages=256 vmalloc N0=256
0x0000000090a80b5a-0x00000000e84776cb 4198400
alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024
0x00000000e84776cb-0x000000006cfc05bf 1052672
alloc_large_system_hash+0x18c/0x272 pages=256 vmalloc N0=256
0x000000006cfc05bf-0x00000000f6ce3623 1576960
alloc_large_system_hash+0x18c/0x272 pages=384 vmalloc N0=384
0x00000000f6ce3623-0x0000000002737823 2101248
alloc_large_system_hash+0x18c/0x272 pages=512 vmalloc N0=512
0x0000000002737823-0x00000000d4e74269 2101248
alloc_large_system_hash+0x18c/0x272 pages=512 vmalloc N0=512