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Violators will be prosecuted for from ; Mon, 17 Dec 2018 15:59:28 -0000 Date: Mon, 17 Dec 2018 16:59:22 +0100 From: Heiko Carstens Subject: [-next] lots of messages due to "mm, memory_hotplug: be more verbose for memory offline failures" MIME-Version: 1.0 Message-Id: <20181217155922.GC3560@osiris> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit Content-Disposition: inline Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Andrew Morton , Oscar Salvador , Anshuman Khandual , Stephen Rothwell , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, linux-s390@vger.kernel.org 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)