Changing status to 'Invalid' due to Gerald's comment #2.
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: ubuntu-z-systems
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1873762
Title:
[Ubuntu 20.04] memory hotplug triggers page migration warnings
Status in Ubuntu on IBM z Systems:
Invalid
Status in linux package in Ubuntu:
Invalid
Bug description:
kernel:
Linux t35lp11 5.4.0-25-generic #29-Ubuntu SMP Fri Apr 17 15:05:32 UTC 2020
s390x s390x s390x GNU/Linux
How to reproduce:
1. Disable hotplugable memory
# chmem -d 1G
2. Look at the kernel messages
# dmesg -T
Then you should see the following:
...
[Mon Apr 20 10:28:30 2020] page:000003d083000000 refcount:1 mapcount:0
mapping:00000000eb7f3600 index:0x0 compound_mapcount: 0
[Mon Apr 20 10:28:30 2020] flags: 0x7fffe0000010200(slab|head)
[Mon Apr 20 10:28:30 2020] raw: 07fffe0000010200 0000000000000100
0000000000000122 00000000eb7f3600
[Mon Apr 20 10:28:30 2020] raw: 0000000000000000 0035006a00000000
ffffffff00000001 0000000000000000
[Mon Apr 20 10:28:30 2020] page dumped because: unmovable page
[Mon Apr 20 10:28:30 2020] page:000003d082564000 refcount:1 mapcount:0
mapping:00000000a88d3600 index:0x0 compound_mapcount: 0
[Mon Apr 20 10:28:30 2020] flags: 0x7fffe0000010200(slab|head)
[Mon Apr 20 10:28:30 2020] raw: 07fffe0000010200 0000000000000100
0000000000000122 00000000a88d3600
[Mon Apr 20 10:28:30 2020] raw: 0000000000000000 004e009c00000000
ffffffff00000001 0000000000000000
[Mon Apr 20 10:28:30 2020] page dumped because: unmovable page
[Mon Apr 20 10:28:30 2020] page:000003d081fb0000 refcount:1 mapcount:0
mapping:0000000000000000 index:0x0
[Mon Apr 20 10:28:30 2020] flags: 0x3fffe0000000000()
[Mon Apr 20 10:28:30 2020] raw: 03fffe0000000000 0000000000000100
0000000000000122 0000000000000000
[Mon Apr 20 10:28:30 2020] raw: 0000000000000000 0000000000000000
ffffffff00000001 0000000000000000
[Mon Apr 20 10:28:30 2020] page dumped because: unmovable page
[Mon Apr 20 10:28:30 2020] page:000003d080000000 refcount:1 mapcount:0
mapping:0000000000000000 index:0x0
[Mon Apr 20 10:28:30 2020] flags: 0x3fffe0000001000(reserved)
[Mon Apr 20 10:28:30 2020] raw: 03fffe0000001000 000003d080000008
000003d080000008 0000000000000000
[Mon Apr 20 10:28:30 2020] raw: 0000000000000000 0000000000000000
ffffffff00000001 0000000000000000
[Mon Apr 20 10:28:30 2020] page dumped because: unmovable page
...
------------------
Maybe helpful information:
------------------
/proc/zoneinfo:
Node 0, zone DMA
per-node stats
nr_inactive_anon 37
nr_active_anon 10899
nr_inactive_file 60239
nr_active_file 12110
nr_unevictable 4237
nr_slab_reclaimable 19489
nr_slab_unreclaimable 21873
nr_isolated_anon 0
nr_isolated_file 0
workingset_nodes 0
workingset_refault 0
workingset_activate 0
workingset_restore 0
workingset_nodereclaim 0
nr_anon_pages 13413
nr_mapped 19622
nr_file_pages 74144
nr_dirty 2
nr_writeback 0
nr_writeback_temp 0
nr_shmem 79
nr_shmem_hugepages 0
nr_shmem_pmdmapped 0
nr_file_hugepages 0
nr_file_pmdmapped 0
nr_anon_transparent_hugepages 0
nr_unstable 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_dirtied 18735
nr_written 17734
nr_kernel_misc_reclaimable 0
pages free 519949
min 1066
low 1590
high 2114
spanned 524288
present 524288
managed 524265
protection: (0, 1714, 1714)
nr_free_pages 519949
nr_zone_inactive_anon 0
nr_zone_active_anon 0
nr_zone_inactive_file 0
nr_zone_active_file 0
nr_zone_unevictable 0
nr_zone_write_pending 0
nr_mlock 0
nr_page_table_pages 0
nr_kernel_stack 0
nr_bounce 0
nr_zspages 0
nr_free_cma 0
numa_hit 5685
numa_miss 0
numa_foreign 0
numa_interleave 78
numa_local 5685
numa_other 0
pagesets
cpu: 0
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 1
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 2
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 3
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 4
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 5
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 6
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 7
count: 0
high: 378
batch: 63
vm stats threshold: 40
node_unreclaimable: 0
start_pfn: 0
Node 0, zone Normal
pages free 124082
min 892
low 1331
high 1770
spanned 524288
present 524288
managed 439016
protection: (0, 0, 0)
nr_free_pages 124082
nr_zone_inactive_anon 37
nr_zone_active_anon 10899
nr_zone_inactive_file 60239
nr_zone_active_file 12110
nr_zone_unevictable 4237
nr_zone_write_pending 2
nr_mlock 4237
nr_page_table_pages 961
nr_kernel_stack 8640
nr_bounce 0
nr_zspages 0
nr_free_cma 0
numa_hit 318257
numa_miss 0
numa_foreign 0
numa_interleave 25536
numa_local 318257
numa_other 0
pagesets
cpu: 0
count: 4
high: 378
batch: 63
vm stats threshold: 40
cpu: 1
count: 60
high: 378
batch: 63
vm stats threshold: 40
cpu: 2
count: 165
high: 378
batch: 63
vm stats threshold: 40
cpu: 3
count: 83
high: 378
batch: 63
vm stats threshold: 40
cpu: 4
count: 61
high: 378
batch: 63
vm stats threshold: 40
cpu: 5
count: 323
high: 378
batch: 63
vm stats threshold: 40
cpu: 6
count: 8
high: 378
batch: 63
vm stats threshold: 40
cpu: 7
count: 0
high: 378
batch: 63
vm stats threshold: 40
node_unreclaimable: 0
start_pfn: 524288
Node 0, zone Movable
pages free 0
min 0
low 0
high 0
spanned 0
present 0
managed 0
protection: (0, 0, 0)
------------------
# lsmem -a
RANGE SIZE STATE REMOVABLE BLOCK
0x0000000000000000-0x000000003fffffff 1G online yes 0
0x0000000040000000-0x000000007fffffff 1G online yes 1
0x0000000080000000-0x00000000bfffffff 1G online yes 2
0x00000000c0000000-0x00000000ffffffff 1G online yes 3
0x0000000100000000-0x000000013fffffff 1G offline 4
0x0000000140000000-0x000000017fffffff 1G offline 5
0x0000000180000000-0x00000001bfffffff 1G offline 6
0x00000001c0000000-0x00000001ffffffff 1G offline 7
0x0000000200000000-0x000000023fffffff 1G offline 8
0x0000000240000000-0x000000027fffffff 1G offline 9
0x0000000280000000-0x00000002bfffffff 1G offline 10
0x00000002c0000000-0x00000002ffffffff 1G offline 11
0x0000000300000000-0x000000033fffffff 1G offline 12
0x0000000340000000-0x000000037fffffff 1G offline 13
0x0000000380000000-0x00000003bfffffff 1G offline 14
0x00000003c0000000-0x00000003ffffffff 1G offline 15
0x0000000400000000-0x000000043fffffff 1G offline 16
0x0000000440000000-0x000000047fffffff 1G offline 17
0x0000000480000000-0x00000004bfffffff 1G offline 18
0x00000004c0000000-0x00000004ffffffff 1G offline 19
0x0000000500000000-0x000000053fffffff 1G offline 20
0x0000000540000000-0x000000057fffffff 1G offline 21
0x0000000580000000-0x00000005bfffffff 1G offline 22
0x00000005c0000000-0x00000005ffffffff 1G offline 23
0x0000000600000000-0x000000063fffffff 1G offline 24
0x0000000640000000-0x000000067fffffff 1G offline 25
0x0000000680000000-0x00000006bfffffff 1G offline 26
0x00000006c0000000-0x00000006ffffffff 1G offline 27
0x0000000700000000-0x000000073fffffff 1G offline 28
0x0000000740000000-0x000000077fffffff 1G offline 29
0x0000000780000000-0x00000007bfffffff 1G offline 30
0x00000007c0000000-0x00000007ffffffff 1G offline 31
0x0000000800000000-0x000000083fffffff 1G offline 32
0x0000000840000000-0x000000087fffffff 1G offline 33
0x0000000880000000-0x00000008bfffffff 1G offline 34
0x00000008c0000000-0x00000008ffffffff 1G offline 35
Memory block size: 1G
Total online memory: 4G
Total offline memory: 32G
Memory block size: 1G
Total online memory: 34G
Total offline memory: 2G
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