------- Comment From geral...@de.ibm.com 2020-05-26 12:40 EDT------- (In reply to comment #8) > Is there a patch/commit out that disabled these messages/migration-warning?
No, and I do not see why this was mirrored at all. This is no bug, this is absolutely normal behaviour since like forever. These warnings will always show, for example, when trying to set a memory block offline which is not removable, i.e. which contains unmovable pages. I can only assume that those might now show more often with current kernels, as there has been some common code rework by David Hildenbrand, which basically eliminates the previously present "removable yes/no" heuristic, because it was very confusing and also racy and thus unreliable. IIRC, now all memory blocks are reported as removable "yes", because this cannot really be reported reliably at all. So, now tools like chmem might try to set permanently un-removable blocks offline more often, because they check the (unreliable) removable attribute. Before the upstream common code change, such tools could have missed removable blocks, but triggered less warnings. Now they will not miss any, but also try offlining blocks that really are permanently un- removable, thus triggering more warnings. But the warning itself is not new or a bug at all. So, since all works as designed, closing this bugzilla. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1873762 Title: [Ubuntu 20.04] memory hotplug triggers page migration warnings Status in Ubuntu on IBM z Systems: Incomplete Status in linux package in Ubuntu: New 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1873762/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
