#cat /var/log/messages|grep _continuous_flood_|wc -l
15

#uname -a
Linux node2c 3.1.0-1.2-xen #5 SMP Mon Mar 5 16:41:01 MSK 2012 x86_64 GNU/Linux

# cat /etc/debian_version
6.0.5


Oct 14 01:11:01 node2c kernel: [1365882.441751] The following is only an harmless informational message.
Oct 14 01:11:01 node2c kernel: [1365882.441756] Unless you get a _continuous_flood_ of these messages it means
Oct 14 01:11:01 node2c kernel: [1365882.441762] everything is working fine. Allocations from irqs cannot be
Oct 14 01:11:01 node2c kernel: [1365882.441767] perfectly reliable and the kernel is designed to handle that.
Oct 14 01:11:01 node2c kernel: [1365882.441773] nginx: page allocation failure. order:1, mode:0x20
Oct 14 01:11:01 node2c kernel: [1365882.441779] Pid: 20800, comm: nginx Not tainted 3.1.0-1.2-xen #5
Oct 14 01:11:01 node2c kernel: [1365882.441784] Call Trace:
Oct 14 01:11:01 node2c kernel: [1365882.441804] [<ffffffff800082a5>] dump_trace+0x85/0x1c0
Oct 14 01:11:01 node2c kernel: [1365882.441818] [<ffffffff804f14c0>] dump_stack+0x69/0x6f
Oct 14 01:11:01 node2c kernel: [1365882.441843] [<ffffffff800d79ea>] warn_alloc_failed+0xfa/0x190
Oct 14 01:11:01 node2c kernel: [1365882.441853] [<ffffffff800db26c>] __alloc_pages_nodemask+0x6ac/0x820
Oct 14 01:11:01 node2c kernel: [1365882.441863] [<ffffffff804f5ef6>] kmem_getpages.isra.45+0x2b/0xcf
Oct 14 01:11:01 node2c kernel: [1365882.441871] [<ffffffff804f60e0>] cache_grow.constprop.49+0xb7/0x21c
Oct 14 01:11:01 node2c kernel: [1365882.441878] [<ffffffff804f63f7>] cache_alloc_refill+0x1b2/0x202
Oct 14 01:11:01 node2c kernel: [1365882.441887] [<ffffffff80110f57>] kmem_cache_alloc+0x157/0x160
Oct 14 01:11:01 node2c kernel: [1365882.441897] [<ffffffff803e1ff3>] sk_prot_alloc+0x43/0x200
Oct 14 01:11:01 node2c kernel: [1365882.441906] [<ffffffff803e26da>] sk_clone+0x1a/0x300
Oct 14 01:11:01 node2c kernel: [1365882.441915] [<ffffffff8042f110>] inet_csk_clone+0x10/0xc0
Oct 14 01:11:01 node2c kernel: [1365882.441926] [<ffffffff804477b1>] tcp_create_openreq_child+0x21/0x460
Oct 14 01:11:01 node2c kernel: [1365882.441935] [<ffffffff80445d37>] tcp_v4_syn_recv_sock+0x47/0x280
Oct 14 01:11:01 node2c kernel: [1365882.441942] [<ffffffff8044834f>] tcp_check_req+0x2ff/0x4c0
Oct 14 01:11:01 node2c kernel: [1365882.441950] [<ffffffff80444faa>] tcp_v4_hnd_req+0x6a/0x130
Oct 14 01:11:01 node2c kernel: [1365882.441957] [<ffffffff80445a33>] tcp_v4_do_rcv+0x123/0x1d0
Oct 14 01:11:01 node2c kernel: [1365882.441964] [<ffffffff80447239>] tcp_v4_rcv+0x559/0x810
Oct 14 01:11:01 node2c kernel: [1365882.441972] [<ffffffff8042461c>] ip_local_deliver_finish+0xcc/0x270
Oct 14 01:11:01 node2c kernel: [1365882.441983] [<ffffffff803f3e72>] __netif_receive_skb+0x502/0x5b0
Oct 14 01:11:01 node2c kernel: [1365882.441992] [<ffffffff803f3fdf>] process_backlog+0xbf/0x200
Oct 14 01:11:01 node2c kernel: [1365882.442000] [<ffffffff803f4d21>] net_rx_action+0x151/0x2d0
Oct 14 01:11:01 node2c kernel: [1365882.442011] [<ffffffff80048faa>] __do_softirq+0xba/0x230
Oct 14 01:11:01 node2c kernel: [1365882.442021] [<ffffffff8050f5cc>] call_softirq+0x1c/0x30
Oct 14 01:11:01 node2c kernel: [1365882.442029] [<ffffffff800081e5>] do_softirq+0x95/0xd0
Oct 14 01:11:01 node2c kernel: [1365882.442037] [<ffffffff80048514>] local_bh_enable+0x94/0xa0
Oct 14 01:11:01 node2c kernel: [1365882.442044] [<ffffffff803f5edb>] dev_queue_xmit+0x18b/0x490
Oct 14 01:11:01 node2c kernel: [1365882.442052] [<ffffffff80440a9c>] tcp_transmit_skb+0x31c/0x570
Oct 14 01:11:01 node2c kernel: [1365882.442059] [<ffffffff804415a5>] tcp_write_xmit+0x1a5/0x3a0
Oct 14 01:11:01 node2c kernel: [1365882.442067] [<ffffffff804417e9>] __tcp_push_pending_frames+0x19/0xb0
Oct 14 01:11:01 node2c kernel: [1365882.442074] [<ffffffff80432e87>] tcp_sendmsg+0x897/0xd10
Oct 14 01:11:01 node2c kernel: [1365882.442082] [<ffffffff803dd5d9>] do_sock_write.isra.10+0xc9/0xf0
Oct 14 01:11:01 node2c kernel: [1365882.442090] [<ffffffff803dd690>] sock_aio_write+0x90/0xc0
Oct 14 01:11:01 node2c kernel: [1365882.442096] [<ffffffff8011f17d>] do_sync_readv_writev+0xad/0xf0
Oct 14 01:11:01 node2c kernel: [1365882.442101] [<ffffffff8011f468>] do_readv_writev+0xd8/0x200
Oct 14 01:11:01 node2c kernel: [1365882.442105] [<ffffffff8011f73b>] sys_writev+0x4b/0xc0
Oct 14 01:11:01 node2c kernel: [1365882.442110] [<ffffffff8050eb33>] system_call_fastpath+0x16/0x1b
Oct 14 01:11:01 node2c kernel: [1365882.442118] [<00007f432e4d77db>] 0x7f432e4d77da
Oct 14 01:11:01 node2c kernel: [1365882.442120] Mem-Info:
Oct 14 01:11:01 node2c kernel: [1365882.442123] DMA per-cpu:
Oct 14 01:11:01 node2c kernel: [1365882.442125] CPU 0: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442127] CPU 1: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442130] CPU 2: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442132] CPU 3: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442135] CPU 4: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442137] CPU 5: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442140] CPU 6: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442142] CPU 7: hi: 0, btch: 1 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442144] DMA32 per-cpu:
Oct 14 01:11:01 node2c kernel: [1365882.442147] CPU 0: hi: 155, btch: 38 usd: 106
Oct 14 01:11:01 node2c kernel: [1365882.442149] CPU 1: hi: 155, btch: 38 usd: 76
Oct 14 01:11:01 node2c kernel: [1365882.442152] CPU 2: hi: 155, btch: 38 usd: 54
Oct 14 01:11:01 node2c kernel: [1365882.442154] CPU 3: hi: 155, btch: 38 usd: 150
Oct 14 01:11:01 node2c kernel: [1365882.442157] CPU 4: hi: 155, btch: 38 usd: 159
Oct 14 01:11:01 node2c kernel: [1365882.442159] CPU 5: hi: 155, btch: 38 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442162] CPU 6: hi: 155, btch: 38 usd: 38
Oct 14 01:11:01 node2c kernel: [1365882.442164] CPU 7: hi: 155, btch: 38 usd: 134
Oct 14 01:11:01 node2c kernel: [1365882.442166] Normal per-cpu:
Oct 14 01:11:01 node2c kernel: [1365882.442169] CPU 0: hi: 35, btch: 8 usd: 32
Oct 14 01:11:01 node2c kernel: [1365882.442171] CPU 1: hi: 35, btch: 8 usd: 20
Oct 14 01:11:01 node2c kernel: [1365882.442174] CPU 2: hi: 35, btch: 8 usd: 16
Oct 14 01:11:01 node2c kernel: [1365882.442176] CPU 3: hi: 35, btch: 8 usd: 16
Oct 14 01:11:01 node2c kernel: [1365882.442179] CPU 4: hi: 35, btch: 8 usd: 30
Oct 14 01:11:01 node2c kernel: [1365882.442181] CPU 5: hi: 35, btch: 8 usd: 0
Oct 14 01:11:01 node2c kernel: [1365882.442183] CPU 6: hi: 35, btch: 8 usd: 10
Oct 14 01:11:01 node2c kernel: [1365882.442186] CPU 7: hi: 35, btch: 8 usd: 16
Oct 14 01:11:01 node2c kernel: [1365882.442191] active_anon:12676 inactive_anon:12081 isolated_anon:0
Oct 14 01:11:01 node2c kernel: [1365882.442192] active_file:27944 inactive_file:27975 isolated_file:0
Oct 14 01:11:01 node2c kernel: [1365882.442192] unevictable:0 dirty:71 writeback:0 unstable:0
Oct 14 01:11:01 node2c kernel: [1365882.442193] free:7655 slab_reclaimable:5465 slab_unreclaimable:5143
Oct 14 01:11:01 node2c kernel: [1365882.442194] mapped:2884 shmem:222 pagetables:0 bounce:0
Oct 14 01:11:01 node2c kernel: [1365882.442203] DMA free:2320kB min:72kB low:88kB high:108kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:14580kB mlocked:0kB dirty:0kB writeback:0kB mapped:4kB shmem:0kB slab_reclaimable:540kB slab_unreclaimable:1476kB kernel_stack:96kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Oct 14 01:11:01 node2c kernel: [1365882.442210] lowmem_reserve[]: 0 571 571 571
Oct 14 01:11:01 node2c kernel: [1365882.442219] DMA32 free:27684kB min:2444kB low:3052kB high:3664kB active_anon:25776kB inactive_anon:23448kB active_file:111768kB inactive_file:111868kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:509620kB mlocked:0kB dirty:280kB writeback:0kB mapped:10644kB shmem:0kB slab_reclaimable:16720kB slab_unreclaimable:15452kB kernel_stack:1056kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Oct 14 01:11:01 node2c kernel: [1365882.442227] lowmem_reserve[]: 0 0 0 0
Oct 14 01:11:01 node2c kernel: [1365882.442235] Normal free:616kB min:576kB low:720kB high:864kB active_anon:24928kB inactive_anon:24876kB active_file:8kB inactive_file:32kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:64096kB mlocked:0kB dirty:4kB writeback:0kB mapped:888kB shmem:888kB slab_reclaimable:4600kB slab_unreclaimable:3644kB kernel_stack:168kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Oct 14 01:11:01 node2c kernel: [1365882.442242] lowmem_reserve[]: 0 0 0 0
Oct 14 01:11:01 node2c kernel: [1365882.442247] DMA: 180*4kB 1*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2344kB
Oct 14 01:11:01 node2c kernel: [1365882.442259] DMA32: 6909*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 27636kB
Oct 14 01:11:01 node2c kernel: [1365882.442271] Normal: 124*4kB 15*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 616kB
Oct 14 01:11:01 node2c kernel: [1365882.442282] 59192 total pagecache pages
Oct 14 01:11:01 node2c kernel: [1365882.442285] 3039 pages in swap cache
Oct 14 01:11:01 node2c kernel: [1365882.442287] Swap cache stats: add 7599771, delete 7596732, find 15846114/16819522
Oct 14 01:11:01 node2c kernel: [1365882.442290] Free swap = 1855692kB
Oct 14 01:11:01 node2c kernel: [1365882.442291] Total swap = 1998844kB
Oct 14 01:11:01 node2c kernel: [1365882.445607] 2097152 pages RAM
Oct 14 01:11:01 node2c kernel: [1365882.445607] 1992172 pages reserved
Oct 14 01:11:01 node2c kernel: [1365882.445607] 24673 pages shared
Oct 14 01:11:01 node2c kernel: [1365882.445607] 79768 pages non-shared