Eu tenho um sistema de banco de dados multiusuário do CentOS 6.1 executando um aplicativo chamado ABC. O servidor é de 64 bits, 8 GB de RAM e 6 vCPU (no VMWare ESXi 4). Recebemos despejos freqüentes no dmesg e os logs do sistema detalhando as falhas de alocação da página do kernel.
O que essas mensagens significam nesse contexto? Como podemos remediar isso?
Feb 5 08:10:52 Fruity kernel: ABC: page allocation failure. order:1, mode:0x20
Feb 5 08:10:52 Fruity kernel: Pid: 23588, comm: ABC Not tainted 2.6.32-131.17.1.el6.x86_64 #1
Feb 5 08:10:52 Fruity kernel: Call Trace:
Feb 5 08:10:52 Fruity kernel: <IRQ> [<ffffffff8112016e>] ? __alloc_pages_nodemask+0x71e/0x8b0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81159a52>] ? kmem_getpages+0x62/0x170
Feb 5 08:10:52 Fruity kernel: [<ffffffff8115a66a>] ? fallback_alloc+0x1ba/0x270
Feb 5 08:10:52 Fruity kernel: [<ffffffff8115a0bf>] ? cache_grow+0x2cf/0x320
Feb 5 08:10:52 Fruity kernel: [<ffffffff8115a3e9>] ? ____cache_alloc_node+0x99/0x160
Feb 5 08:10:52 Fruity kernel: [<ffffffff8115b1ab>] ? kmem_cache_alloc+0x11b/0x190
Feb 5 08:10:52 Fruity kernel: [<ffffffff81411ba8>] ? sk_prot_alloc+0x48/0x1a0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81411e12>] ? sk_clone+0x22/0x2c0
Feb 5 08:10:52 Fruity kernel: [<ffffffff8145caf6>] ? inet_csk_clone+0x16/0xd0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81475be3>] ? tcp_create_openreq_child+0x23/0x450
Feb 5 08:10:52 Fruity kernel: [<ffffffff814735cd>] ? tcp_v4_syn_recv_sock+0x4d/0x2a0
Feb 5 08:10:52 Fruity kernel: [<ffffffff814759a1>] ? tcp_check_req+0x201/0x420
Feb 5 08:10:52 Fruity kernel: [<ffffffff8146b4b6>] ? tcp_rcv_state_process+0x116/0xa30
Feb 5 08:10:52 Fruity kernel: [<ffffffff8105055a>] ? enqueue_entity+0x13a/0x340
Feb 5 08:10:52 Fruity kernel: [<ffffffff81472feb>] ? tcp_v4_do_rcv+0x35b/0x430
Feb 5 08:10:52 Fruity kernel: [<ffffffff81474760>] ? tcp_v4_rcv+0x4e0/0x860
Feb 5 08:10:52 Fruity kernel: [<ffffffff8105dc32>] ? default_wake_function+0x12/0x20
Feb 5 08:10:52 Fruity kernel: [<ffffffff8145247d>] ? ip_local_deliver_finish+0xdd/0x2d0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81452708>] ? ip_local_deliver+0x98/0xa0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81451bcd>] ? ip_rcv_finish+0x12d/0x440
Feb 5 08:10:52 Fruity kernel: [<ffffffff8104fc08>] ? update_curr+0xf8/0x1e0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81452155>] ? ip_rcv+0x275/0x350
Feb 5 08:10:52 Fruity kernel: [<ffffffff8141dccb>] ? __netif_receive_skb+0x39b/0x6b0
Feb 5 08:10:52 Fruity kernel: [<ffffffff810db997>] ? cpu_quiet_msk+0x77/0x130
Feb 5 08:10:52 Fruity kernel: [<ffffffff8141e07a>] ? process_backlog+0x9a/0x100
Feb 5 08:10:52 Fruity kernel: [<ffffffff81422533>] ? net_rx_action+0x103/0x2f0
Feb 5 08:10:52 Fruity kernel: [<ffffffff8106f6e1>] ? __do_softirq+0xc1/0x1d0
Feb 5 08:10:52 Fruity kernel: [<ffffffff8100c2cc>] ? call_softirq+0x1c/0x30
Feb 5 08:10:52 Fruity kernel: [<ffffffff8100c2cc>] ? call_softirq+0x1c/0x30
Feb 5 08:10:52 Fruity kernel: <EOI> [<ffffffff8100df05>] ? do_softirq+0x65/0xa0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81070028>] ? local_bh_enable_ip+0x98/0xa0
Feb 5 08:10:52 Fruity kernel: [<ffffffff814dd92b>] ? _spin_unlock_bh+0x1b/0x20
Feb 5 08:10:52 Fruity kernel: [<ffffffff8140f46e>] ? release_sock+0xce/0xe0
Feb 5 08:10:52 Fruity kernel: [<ffffffff81483953>] ? inet_stream_connect+0x183/0x2c0
Feb 5 08:10:52 Fruity kernel: [<ffffffff8108e180>] ? autoremove_wake_function+0x0/0x40
Feb 5 08:10:52 Fruity kernel: [<ffffffff8140d007>] ? sys_connect+0xd7/0xf0
Feb 5 08:10:52 Fruity kernel: [<ffffffff8145f652>] ? compat_tcp_setsockopt+0x22/0x30
Feb 5 08:10:52 Fruity kernel: [<ffffffff8140eb9c>] ? compat_sock_common_setsockopt+0x1c/0x30
Feb 5 08:10:52 Fruity kernel: [<ffffffff81437d05>] ? compat_sys_setsockopt+0x85/0x220
Feb 5 08:10:52 Fruity kernel: [<ffffffff81184828>] ? sys_fcntl+0x118/0x530
Feb 5 08:10:52 Fruity kernel: [<ffffffff8143805e>] ? compat_sys_socketcall+0x1be/0x200
Feb 5 08:10:52 Fruity kernel: [<ffffffff810478b0>] ? sysenter_dispatch+0x7/0x2e
Feb 5 08:10:52 Fruity kernel: Mem-Info:
Feb 5 08:10:52 Fruity kernel: Node 0 DMA per-cpu:
Feb 5 08:10:52 Fruity kernel: CPU 0: hi: 0, btch: 1 usd: 0
Feb 5 08:10:52 Fruity kernel: CPU 1: hi: 0, btch: 1 usd: 0
Feb 5 08:10:52 Fruity kernel: CPU 2: hi: 0, btch: 1 usd: 0
Feb 5 08:10:52 Fruity kernel: CPU 3: hi: 0, btch: 1 usd: 0
Feb 5 08:10:52 Fruity kernel: CPU 4: hi: 0, btch: 1 usd: 0
Feb 5 08:10:52 Fruity kernel: CPU 5: hi: 0, btch: 1 usd: 0
Feb 5 08:10:52 Fruity kernel: Node 0 DMA32 per-cpu:
Feb 5 08:10:52 Fruity kernel: CPU 0: hi: 186, btch: 31 usd: 167
Feb 5 08:10:52 Fruity kernel: CPU 1: hi: 186, btch: 31 usd: 44
Feb 5 08:10:52 Fruity kernel: CPU 2: hi: 186, btch: 31 usd: 59
Feb 5 08:10:52 Fruity kernel: CPU 3: hi: 186, btch: 31 usd: 46
Feb 5 08:10:52 Fruity kernel: CPU 4: hi: 186, btch: 31 usd: 157
Feb 5 08:10:52 Fruity kernel: CPU 5: hi: 186, btch: 31 usd: 45
Feb 5 08:10:52 Fruity kernel: Node 0 Normal per-cpu:
Feb 5 08:10:52 Fruity kernel: CPU 0: hi: 186, btch: 31 usd: 182
Feb 5 08:10:52 Fruity kernel: CPU 1: hi: 186, btch: 31 usd: 44
Feb 5 08:10:52 Fruity kernel: CPU 2: hi: 186, btch: 31 usd: 15
Feb 5 08:10:52 Fruity kernel: CPU 3: hi: 186, btch: 31 usd: 88
Feb 5 08:10:52 Fruity kernel: CPU 4: hi: 186, btch: 31 usd: 181
Feb 5 08:10:52 Fruity kernel: CPU 5: hi: 186, btch: 31 usd: 33
Feb 5 08:10:52 Fruity kernel: active_anon:79381 inactive_anon:21406 isolated_anon:0
Feb 5 08:10:52 Fruity kernel: active_file:395766 inactive_file:1432708 isolated_file:0
Feb 5 08:10:52 Fruity kernel: unevictable:0 dirty:297 writeback:0 unstable:0
Feb 5 08:10:52 Fruity kernel: free:31126 slab_reclaimable:25909 slab_unreclaimable:44714
Feb 5 08:10:52 Fruity kernel: mapped:3908 shmem:103 pagetables:4196 bounce:0
Feb 5 08:10:52 Fruity kernel: Node 0 DMA free:15680kB min:124kB low:152kB high:184kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15284kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Feb 5 08:10:52 Fruity kernel: lowmem_reserve[]: 0 3000 8050 8050
Feb 5 08:10:52 Fruity kernel: Node 0 DMA32 free:56332kB min:25140kB low:31424kB high:37708kB active_anon:36800kB inactive_anon:33152kB active_file:631228kB inactive_file:2126792kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3072160kB mlocked:0kB dirty:360kB writeback:0kB mapped:4500kB shmem:4kB slab_reclaimable:42108kB slab_unreclaimable:4760kB kernel_stack:256kB pagetables:1228kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Feb 5 08:10:52 Fruity kernel: lowmem_reserve[]: 0 0 5050 5050
Feb 5 08:10:52 Fruity kernel: Node 0 Normal free:52492kB min:42316kB low:52892kB high:63472kB active_anon:280724kB inactive_anon:52472kB active_file:951836kB inactive_file:3603784kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:5171200kB mlocked:0kB dirty:828kB writeback:0kB mapped:11132kB shmem:408kB slab_reclaimable:61528kB slab_unreclaimable:174096kB kernel_stack:3112kB pagetables:15556kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Feb 5 08:10:52 Fruity kernel: lowmem_reserve[]: 0 0 0 0
Feb 5 08:10:52 Fruity kernel: Node 0 DMA: 4*4kB 2*8kB 2*16kB 0*32kB 2*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15680kB
Feb 5 08:10:52 Fruity kernel: Node 0 DMA32: 12892*4kB 79*8kB 30*16kB 10*32kB 4*64kB 19*128kB 3*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 56456kB
Feb 5 08:10:52 Fruity kernel: Node 0 Normal: 12558*4kB 35*8kB 1*16kB 1*32kB 4*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB = 52864kB
Feb 5 08:10:52 Fruity kernel: 1834295 total pagecache pages
Feb 5 08:10:52 Fruity kernel: 5823 pages in swap cache
Feb 5 08:10:52 Fruity kernel: Swap cache stats: add 112073, delete 106250, find 283106960/283124994
Feb 5 08:10:52 Fruity kernel: Free swap = 8352448kB
Feb 5 08:10:52 Fruity kernel: Total swap = 8388600kB
Feb 5 08:10:52 Fruity kernel: 2097136 pages RAM
Feb 5 08:10:52 Fruity kernel: 48740 pages reserved
Feb 5 08:10:52 Fruity kernel: 73879 pages shared
Feb 5 08:10:52 Fruity kernel: 1940523 pages non-shared
Editar: isso ainda está acontecendo, mesmo com algumas das alterações sugeridas abaixo. O traço atual se parece com:
Feb 29 04:45:33 Fruity kernel: swapper: page allocation failure. order:1, mode:0x20
Feb 29 04:45:33 Fruity kernel: Pid: 0, comm: swapper Not tainted 2.6.32-131.17.1.el6.x86_64 #1
Feb 29 04:45:33 Fruity kernel: Call Trace:
Feb 29 04:45:33 Fruity kernel: <IRQ> [<ffffffff8112016e>] ? __alloc_pages_nodemask+0x71e/0x8b0
Feb 29 04:45:33 Fruity kernel: [<ffffffff81159a52>] ? kmem_getpages+0x62/0x170
Feb 29 04:45:33 Fruity kernel: [<ffffffff8115a66a>] ? fallback_alloc+0x1ba/0x270
Feb 29 04:45:33 Fruity kernel: [<ffffffff8115a0bf>] ? cache_grow+0x2cf/0x320
Feb 29 04:45:33 Fruity kernel: [<ffffffff8115a3e9>] ? ____cache_alloc_node+0x99/0x160
Feb 29 04:45:33 Fruity kernel: [<ffffffff8115b1ab>] ? kmem_cache_alloc+0x11b/0x190
Feb 29 04:45:33 Fruity kernel: [<ffffffff81411ba8>] ? sk_prot_alloc+0x48/0x1a0
Feb 29 04:45:33 Fruity kernel: [<ffffffff81411e12>] ? sk_clone+0x22/0x2c0
Feb 29 04:45:33 Fruity kernel: [<ffffffff8145caf6>] ? inet_csk_clone+0x16/0xd0
Feb 29 04:45:33 Fruity kernel: [<ffffffff81475be3>] ? tcp_create_openreq_child+0x23/0x450
Feb 29 04:45:33 Fruity kernel: [<ffffffff814735cd>] ? tcp_v4_syn_recv_sock+0x4d/0x2a0
Feb 29 04:45:33 Fruity kernel: [<ffffffff814759a1>] ? tcp_check_req+0x201/0x420
Feb 29 04:45:33 Fruity kernel: [<ffffffff8146b4b6>] ? tcp_rcv_state_process+0x116/0xa30
Feb 29 04:45:33 Fruity kernel: [<ffffffff81472feb>] ? tcp_v4_do_rcv+0x35b/0x430
Feb 29 04:45:33 Fruity kernel: [<ffffffff81413a1b>] ? consume_skb+0x3b/0x80
Feb 29 04:45:33 Fruity kernel: [<ffffffff81474760>] ? tcp_v4_rcv+0x4e0/0x860
Feb 29 04:45:33 Fruity kernel: [<ffffffff8145247d>] ? ip_local_deliver_finish+0xdd/0x2d0
Feb 29 04:45:33 Fruity kernel: [<ffffffff81452708>] ? ip_local_deliver+0x98/0xa0
Feb 29 04:45:33 Fruity kernel: [<ffffffff81451bcd>] ? ip_rcv_finish+0x12d/0x440
Feb 29 04:45:33 Fruity kernel: [<ffffffff81452155>] ? ip_rcv+0x275/0x350
Feb 29 04:45:33 Fruity kernel: [<ffffffff8141dccb>] ? __netif_receive_skb+0x39b/0x6b0
Feb 29 04:45:33 Fruity kernel: [<ffffffff810a41a4>] ? __smp_call_function_single+0x64/0xe0
Feb 29 04:45:33 Fruity kernel: [<ffffffff8141ffd8>] ? netif_receive_skb+0x58/0x60
Feb 29 04:45:33 Fruity kernel: [<ffffffffa0131853>] ? vmxnet3_poll+0x403/0x9f0 [vmxnet3]
Feb 29 04:45:33 Fruity kernel: [<ffffffffa0036c40>] ? pvscsi_process_completion_ring+0xe0/0x350 [vmw_pvscsi]
Feb 29 04:45:33 Fruity kernel: [<ffffffff81422533>] ? net_rx_action+0x103/0x2f0
Feb 29 04:45:33 Fruity kernel: [<ffffffff8106f6e1>] ? __do_softirq+0xc1/0x1d0
Feb 29 04:45:33 Fruity kernel: [<ffffffff810d6930>] ? handle_IRQ_event+0x60/0x170
Feb 29 04:45:33 Fruity kernel: [<ffffffff8100c2cc>] ? call_softirq+0x1c/0x30
Feb 29 04:45:33 Fruity kernel: [<ffffffff8100df05>] ? do_softirq+0x65/0xa0
Feb 29 04:45:33 Fruity kernel: [<ffffffff8106f4c5>] ? irq_exit+0x85/0x90
Feb 29 04:45:33 Fruity kernel: [<ffffffff814e3195>] ? do_IRQ+0x75/0xf0
Feb 29 04:45:33 Fruity kernel: [<ffffffff8100bad3>] ? ret_from_intr+0x0/0x11
Feb 29 04:45:33 Fruity kernel: <EOI> [<ffffffff8103628b>] ? native_safe_halt+0xb/0x10
Feb 29 04:45:33 Fruity kernel: [<ffffffff810142ed>] ? default_idle+0x4d/0xb0
Feb 29 04:45:33 Fruity kernel: [<ffffffff81009e86>] ? cpu_idle+0xb6/0x110
Feb 29 04:45:33 Fruity kernel: [<ffffffff814c33da>] ? rest_init+0x7a/0x80
Feb 29 04:45:33 Fruity kernel: [<ffffffff81c1df28>] ? start_kernel+0x41d/0x429
Feb 29 04:45:33 Fruity kernel: [<ffffffff81c1d33a>] ? x86_64_start_reservations+0x125/0x129
Feb 29 04:45:33 Fruity kernel: [<ffffffff81c1d438>] ? x86_64_start_kernel+0xfa/0x109
Feb 29 04:45:33 Fruity kernel: Mem-Info:
Feb 29 04:45:33 Fruity kernel: Node 0 DMA per-cpu:
Feb 29 04:45:33 Fruity kernel: CPU 0: hi: 0, btch: 1 usd: 0
Feb 29 04:45:33 Fruity kernel: CPU 1: hi: 0, btch: 1 usd: 0
Feb 29 04:45:33 Fruity kernel: CPU 2: hi: 0, btch: 1 usd: 0
Feb 29 04:45:33 Fruity kernel: CPU 3: hi: 0, btch: 1 usd: 0
Feb 29 04:45:33 Fruity kernel: CPU 4: hi: 0, btch: 1 usd: 0
Feb 29 04:45:33 Fruity kernel: CPU 5: hi: 0, btch: 1 usd: 0
Feb 29 04:45:33 Fruity kernel: Node 0 DMA32 per-cpu:
Feb 29 04:45:33 Fruity kernel: CPU 0: hi: 186, btch: 31 usd: 46
Feb 29 04:45:33 Fruity kernel: CPU 1: hi: 186, btch: 31 usd: 1
Feb 29 04:45:33 Fruity kernel: CPU 2: hi: 186, btch: 31 usd: 23
Feb 29 04:45:33 Fruity kernel: CPU 3: hi: 186, btch: 31 usd: 10
Feb 29 04:45:33 Fruity kernel: CPU 4: hi: 186, btch: 31 usd: 38
Feb 29 04:45:33 Fruity kernel: CPU 5: hi: 186, btch: 31 usd: 2
Feb 29 04:45:33 Fruity kernel: Node 0 Normal per-cpu:
Feb 29 04:45:33 Fruity kernel: CPU 0: hi: 186, btch: 31 usd: 65
Feb 29 04:45:33 Fruity kernel: CPU 1: hi: 186, btch: 31 usd: 0
Feb 29 04:45:33 Fruity kernel: CPU 2: hi: 186, btch: 31 usd: 14
Feb 29 04:45:33 Fruity kernel: CPU 3: hi: 186, btch: 31 usd: 2
Feb 29 04:45:33 Fruity kernel: CPU 4: hi: 186, btch: 31 usd: 29
Feb 29 04:45:33 Fruity kernel: CPU 5: hi: 186, btch: 31 usd: 50
Feb 29 04:45:33 Fruity kernel: active_anon:118532 inactive_anon:29343 isolated_anon:0
Feb 29 04:45:33 Fruity kernel: active_file:870242 inactive_file:899801 isolated_file:0
Feb 29 04:45:33 Fruity kernel: unevictable:0 dirty:5135 writeback:0 unstable:0
Feb 29 04:45:33 Fruity kernel: free:33179 slab_reclaimable:34315 slab_unreclaimable:45350
Feb 29 04:45:33 Fruity kernel: mapped:3464 shmem:133 pagetables:4997 bounce:0
Feb 29 04:45:33 Fruity kernel: Node 0 DMA free:15680kB min:124kB low:152kB high:184kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15284kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Feb 29 04:45:33 Fruity kernel: lowmem_reserve[]: 0 3000 8050 8050
Feb 29 04:45:33 Fruity kernel: Node 0 DMA32 free:64200kB min:25140kB low:31424kB high:37708kB active_anon:59816kB inactive_anon:47980kB active_file:1319196kB inactive_file:1374832kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3072160kB mlocked:0kB dirty:7680kB writeback:0kB mapped:3004kB shmem:40kB slab_reclaimable:62060kB slab_unreclaimable:5368kB kernel_stack:160kB pagetables:900kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Feb 29 04:45:33 Fruity kernel: lowmem_reserve[]: 0 0 5050 5050
Feb 29 04:45:33 Fruity kernel: Node 0 Normal free:52836kB min:42316kB low:52892kB high:63472kB active_anon:414312kB inactive_anon:69392kB active_file:2161772kB inactive_file:2224372kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:5171200kB mlocked:0kB dirty:12860kB writeback:0kB mapped:10852kB shmem:492kB slab_reclaimable:75200kB slab_unreclaimable:176032kB kernel_stack:3384kB pagetables:19088kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Feb 29 04:45:33 Fruity kernel: lowmem_reserve[]: 0 0 0 0
Feb 29 04:45:33 Fruity kernel: Node 0 DMA: 4*4kB 2*8kB 2*16kB 0*32kB 2*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15680kB
Feb 29 04:45:33 Fruity kernel: Node 0 DMA32: 15988*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 63952kB
Feb 29 04:45:33 Fruity kernel: Node 0 Normal: 13209*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 52836kB
Feb 29 04:45:33 Fruity kernel: 1776603 total pagecache pages
Feb 29 04:45:33 Fruity kernel: 6398 pages in swap cache
Feb 29 04:45:33 Fruity kernel: Swap cache stats: add 163231, delete 156833, find 403959091/403986630
Feb 29 04:45:33 Fruity kernel: Free swap = 8339552kB
Feb 29 04:45:33 Fruity kernel: Total swap = 8388600kB
Feb 29 04:45:33 Fruity kernel: 2097136 pages RAM
Feb 29 04:45:33 Fruity kernel: 48740 pages reserved
Feb 29 04:45:33 Fruity kernel: 198220 pages shared
Feb 29 04:45:33 Fruity kernel: 1833933 pages non-shared
O problema aqui eram drivers convidados VMware desatualizados (vmware-tools) e um SO mais novo sob carga. Isso é algo que é revisado à medida que o ESXi atualizado é lançado. Lançamentos de pontos prontos para uso do VMWare estão mostrando esse problema. Versões atualizadas não são.
É claro que existe a questão de como atualizar de forma limpa a sua instalação do VMware ...
Pensando em voz alta aqui, mas você já considerou aumentar o valor de vm.min_free_kbytes usando sysctl?
algo como:
sysctl vm.min_free_kbytes=16384
(ps - não tem 100% de certeza o que é suposto estar em centos, mais provavelmente em / proc / sys / vm / min_free_kbytes)
Eu tenho visto muitos deles também ... especialmente no meu mirrorserver rodando o apache. Nesse servidor, a mudança do alocador SLAB para o SLUB ajudou a atenuar o problema.
Em outra máquina com uma interface MTU grande, ainda estou recebendo falhas de alocação em um caminho semelhante, mas desta vez na ordem 5. Ainda não encontrei a solução para essa.
Outra coisa que ajuda parcialmente, ou melhor, ajuda a reduzir a frequência é a compactação freqüente de memória ( echo 1 > /proc/sys/vm/compact_memory é executada a cada minuto do cron).
Outra coisa que vale a pena é como o seu aplicativo funciona com a memória - por exemplo. como aloca e libera. Se houver alocações e desalocações freqüentes, pode valer a pena tentar usar algum tipo de pool de memória.
A última coisa, mas não menos importante, que vale a pena tentar é habilitar ou desabilitar (transparente) abraepages.