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* [PATCH 0/1] mm/fake-numa: allow later numa node hotplug
@ 2025-01-06 12:06 Bruno Faccini
  2025-01-06 12:06 ` [PATCH 1/1] " Bruno Faccini
  2025-01-07 10:08 ` [PATCH 0/1] " David Hildenbrand
  0 siblings, 2 replies; 15+ messages in thread
From: Bruno Faccini @ 2025-01-06 12:06 UTC (permalink / raw)
  To: linux-kernel
  Cc: linux-mm, akpm, rppt, david, ziy, jhubbard, mrusiniak, Bruno Faccini

When trying to use fake-numa feature on our system where new
Numa nodes are being "hot-plugged" upon driver load, this fails
with the following type of message and warning with stack :

node 8 was absent from the node_possible_map
WARNING: CPU: 61 PID: 4259 at mm/memory_hotplug.c:1506
add_memory_resource+0x3dc/0x418

This issue prevents the use of the fake-NUMA debug feature with
the system's full configuration, when it has proven to be sometimes
extremely useful for performance testing of multi-tasked,
memory-bound applications, as it enables better isolation of
processes/ranks compared to fat NUMA nodes.

Usual numactl output after driver has “hot-plugged”/unveiled some
new Numa nodes with and without memory :
$ numactl --hardware
available: 9 nodes (0-8)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 0 size: 490037 MB
node 0 free: 484432 MB
node 1 cpus:
node 1 size: 97280 MB
node 1 free: 97279 MB
node 2 cpus:
node 2 size: 0 MB
node 2 free: 0 MB
node 3 cpus:
node 3 size: 0 MB
node 3 free: 0 MB
node 4 cpus:
node 4 size: 0 MB
node 4 free: 0 MB
node 5 cpus:
node 5 size: 0 MB
node 5 free: 0 MB
node 6 cpus:
node 6 size: 0 MB
node 6 free: 0 MB
node 7 cpus:
node 7 size: 0 MB
node 7 free: 0 MB
node 8 cpus:
node 8 size: 0 MB
node 8 free: 0 MB
node distances:
node   0   1   2   3   4   5   6   7   8
  0:  10  80  80  80  80  80  80  80  80
  1:  80  10  255  255  255  255  255  255  255
  2:  80  255  10  255  255  255  255  255  255
  3:  80  255  255  10  255  255  255  255  255
  4:  80  255  255  255  10  255  255  255  255
  5:  80  255  255  255  255  10  255  255  255
  6:  80  255  255  255  255  255  10  255  255
  7:  80  255  255  255  255  255  255  10  255
  8:  80  255  255  255  255  255  255  255  10


With recent M.Rapoport set of fake-numa patches in mm-everything
and using numa=fake=4 boot parameter :
$ numactl --hardware
available: 4 nodes (0-3)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 0 size: 122518 MB
node 0 free: 117141 MB
node 1 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 1 size: 219911 MB
node 1 free: 219751 MB
node 2 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 2 size: 122599 MB
node 2 free: 122541 MB
node 3 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 3 size: 122479 MB
node 3 free: 122408 MB
node distances:
node   0   1   2   3
  0:  10  10  10  10
  1:  10  10  10  10
  2:  10  10  10  10
  3:  10  10  10  10


With recent M.Rapoport set of fake-numa patches in mm-everything,
this patch on top, using numa=fake=4 boot parameter :
# numactl —hardware
available: 12 nodes (0-11)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 0 size: 122518 MB
node 0 free: 116429 MB
node 1 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 1 size: 122631 MB
node 1 free: 122576 MB
node 2 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 2 size: 122599 MB
node 2 free: 122544 MB
node 3 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
65 66 67 68 69 70 71
node 3 size: 122479 MB
node 3 free: 122419 MB
node 4 cpus:
node 4 size: 97280 MB
node 4 free: 97279 MB
node 5 cpus:
node 5 size: 0 MB
node 5 free: 0 MB
node 6 cpus:
node 6 size: 0 MB
node 6 free: 0 MB
node 7 cpus:
node 7 size: 0 MB
node 7 free: 0 MB
node 8 cpus:
node 8 size: 0 MB
node 8 free: 0 MB
node 9 cpus:
node 9 size: 0 MB
node 9 free: 0 MB
node 10 cpus:
node 10 size: 0 MB
node 10 free: 0 MB
node 11 cpus:
node 11 size: 0 MB
node 11 free: 0 MB
node distances:
node   0   1   2   3   4   5   6   7   8   9  10  11
  0:  10  10  10  10  80  80  80  80  80  80  80  80
  1:  10  10  10  10  80  80  80  80  80  80  80  80
  2:  10  10  10  10  80  80  80  80  80  80  80  80
  3:  10  10  10  10  80  80  80  80  80  80  80  80
  4:  80  80  80  80  10  255  255  255  255  255  255  255
  5:  80  80  80  80  255  10  255  255  255  255  255  255
  6:  80  80  80  80  255  255  10  255  255  255  255  255
  7:  80  80  80  80  255  255  255  10  255  255  255  255
  8:  80  80  80  80  255  255  255  255  10  255  255  255
  9:  80  80  80  80  255  255  255  255  255  10  255  255
 10:  80  80  80  80  255  255  255  255  255  255  10  255
 11:  80  80  80  80  255  255  255  255  255  255  255  10


Bruno Faccini (1):
  mm/fake-numa: allow later numa node hotplug

 drivers/acpi/numa/srat.c     | 86 ++++++++++++++++++++++++++++++++++++
 include/acpi/acpi_numa.h     |  5 +++
 include/linux/numa_memblks.h |  3 ++
 mm/numa_emulation.c          | 45 ++++++++++++++++---
 mm/numa_memblks.c            |  2 +-
 5 files changed, 133 insertions(+), 8 deletions(-)


base-commit: 4c10320ffbe7d6273b153b112a6e5f9b61ac008a
-- 
2.43.0



^ permalink raw reply	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2025-01-27 17:39 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2025-01-06 12:06 [PATCH 0/1] mm/fake-numa: allow later numa node hotplug Bruno Faccini
2025-01-06 12:06 ` [PATCH 1/1] " Bruno Faccini
2025-01-14 16:05   ` David Hildenbrand
2025-01-17  5:00   ` [fake numa not working][PATCH " Hyeonggon Yoo
2025-01-17 19:09     ` [fake numa not working] [PATCH " Zi Yan
2025-01-20  0:37       ` Hyeonggon Yoo
2025-01-20  2:16         ` Zi Yan
2025-01-20  2:37           ` Hyeonggon Yoo
2025-01-20  3:27             ` Zi Yan
2025-01-20  4:35               ` Hyeonggon Yoo
2025-01-20  8:11               ` Bruno Faccini
2025-01-27 17:38                 ` Bruno Faccini
2025-01-07 10:08 ` [PATCH 0/1] " David Hildenbrand
2025-01-10 14:59   ` Bruno Faccini
2025-01-14 14:15     ` David Hildenbrand

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