Hi Michal,
with linux-next as of today on s390 I see tons of messages like
[ 20.536664] page dumped because: has_unmovable_pages
[ 20.536792] page:000003d081ff4080 count:1 mapcount:0 mapping:000000008ff88600 index:0x0 compound_mapcount: 0
[ 20.536794] flags: 0x3fffe0000010200(slab|head)
[ 20.536795] raw: 03fffe0000010200 0000000000000100 0000000000000200 000000008ff88600
[ 20.536796] raw: 0000000000000000 0020004100000000 ffffffff00000001 0000000000000000
[ 20.536797] page dumped because: has_unmovable_pages
[ 20.536814] page:000003d0823b0000 count:1 mapcount:0 mapping:0000000000000000 index:0x0
[ 20.536815] flags: 0x7fffe0000000000()
[ 20.536817] raw: 07fffe0000000000 0000000000000100 0000000000000200 0000000000000000
[ 20.536818] raw: 0000000000000000 0000000000000000 ffffffff00000001 0000000000000000
bisect points to b323c049a999 ("mm, memory_hotplug: be more verbose for memory offline failures")
which is the first commit with which the messages appear.
Note: there is _no_ memory hotplug involved when these messages appear.
I don't know if it helps, but this is the contents of /proc/zoneinfo:
Node 0, zone DMA
per-node stats
nr_inactive_anon 8
nr_active_anon 8389
nr_inactive_file 43418
nr_active_file 22655
nr_unevictable 0
nr_slab_reclaimable 8192
nr_slab_unreclaimable 11368
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 7088
nr_mapped 16328
nr_file_pages 66132
nr_dirty 0
nr_writeback 0
nr_writeback_temp 0
nr_shmem 55
nr_shmem_hugepages 0
nr_shmem_pmdmapped 0
nr_anon_transparent_hugepages 4
nr_unstable 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_dirtied 20723
nr_written 18227
nr_kernel_misc_reclaimable 0
pages free 519834
min 1899
low 2419
high 2939
spanned 524288
present 524288
managed 520562
protection: (0, 3988, 3988)
nr_free_pages 519834
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 40
numa_miss 0
numa_foreign 0
numa_interleave 12
numa_local 40
numa_other 0
pagesets
cpu: 0
count: 336
high: 378
batch: 63
vm stats threshold: 40
cpu: 1
count: 60
high: 378
batch: 63
vm stats threshold: 40
cpu: 2
count: 60
high: 378
batch: 63
vm stats threshold: 40
cpu: 3
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 4
count: 62
high: 378
batch: 63
vm stats threshold: 40
cpu: 5
count: 0
high: 378
batch: 63
vm stats threshold: 40
cpu: 6
count: 59
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 912587
min 3732
low 4754
high 5776
spanned 1048576
present 1048576
managed 1022150
protection: (0, 0, 0)
nr_free_pages 912587
nr_zone_inactive_anon 8
nr_zone_active_anon 8389
nr_zone_inactive_file 43418
nr_zone_active_file 22655
nr_zone_unevictable 0
nr_zone_write_pending 0
nr_mlock 0
nr_page_table_pages 548
nr_kernel_stack 3072
nr_bounce 0
nr_zspages 0
nr_free_cma 1024
numa_hit 3115288
numa_miss 0
numa_foreign 0
numa_interleave 6865
numa_local 3115288
numa_other 0
pagesets
cpu: 0
count: 86
high: 90
batch: 15
vm stats threshold: 48
cpu: 1
count: 80
high: 90
batch: 15
vm stats threshold: 48
cpu: 2
count: 76
high: 90
batch: 15
vm stats threshold: 48
cpu: 3
count: 53
high: 90
batch: 15
vm stats threshold: 48
cpu: 4
count: 81
high: 90
batch: 15
vm stats threshold: 48
cpu: 5
count: 18
high: 90
batch: 15
vm stats threshold: 48
cpu: 6
count: 73
high: 90
batch: 15
vm stats threshold: 48
cpu: 7
count: 63
high: 90
batch: 15
vm stats threshold: 48
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)
