We use Apache and OCFS2 on 3 servers and at least 2 of them are
reporting those swapper page allocation failures.

Machines are HP DL380 G5 with 8GB RAM (DIMM and FB-DIMM on different
machines) and OCFS2 on a qlogic fiber attached MSA storage.

Example from one machine:
Linux web2 2.6.24-24-server #1 SMP Wed Apr 15 16:36:01 UTC 2009 i686 GNU/Linux

swapper: page allocation failure. order:1, mode:0x4020

Pid: 0, comm: swapper Not tainted 2.6.24-24-server #1

 [<c01785ab>] __alloc_pages+0x2ab/0x380

 [<c02dbb89>] ip_local_deliver_finish+0xf9/0x210

 [<c0196226>] __slab_alloc+0x186/0x4a0

 [<c0197446>] __kmalloc_track_caller+0x106/0x110

 [<c02b4d32>] __netdev_alloc_skb+0x22/0x50

 [<c02b4d32>] __netdev_alloc_skb+0x22/0x50

 [<c02b4125>] __alloc_skb+0x55/0x120

 [<c02b4d32>] __netdev_alloc_skb+0x22/0x50

 [<f89592c1>] bnx2_poll+0x6f1/0xd10 [bnx2]

 [<c012d974>] load_balance_fair+0xc4/0x100

 [<f8958c00>] bnx2_poll+0x30/0xd10 [bnx2]

 [<f8958e15>] bnx2_poll+0x245/0xd10 [bnx2]

 [<c014c024>] getnstimeofday+0x34/0xf0

 [<c02bb7ed>] net_rx_action+0x12d/0x210

 [<c01498f8>] ktime_get+0x18/0x40

 [<c0136e42>] __do_softirq+0x82/0x110

 [<c0136f25>] do_softirq+0x55/0x60

 [<c013720d>] irq_exit+0x6d/0x80

 [<c010a930>] do_IRQ+0x40/0x70

 [<c014989e>] ktime_get_ts+0x1e/0x60

 [<c0108def>] common_interrupt+0x23/0x28

 [<c01062e6>] mwait_idle_with_hints+0x46/0x60

 [<c01066c3>] cpu_idle+0x73/0xd0

 =======================

Mem-info:

DMA per-cpu:

CPU    0: Hot: hi:    0, btch:   1 usd:   0   Cold: hi:    0, btch:   1
usd:   0

CPU    1: Hot: hi:    0, btch:   1 usd:   0   Cold: hi:    0, btch:   1
usd:   0

Normal per-cpu:

CPU    0: Hot: hi:  186, btch:  31 usd: 176   Cold: hi:   62, btch:  15
usd:  57

CPU    1: Hot: hi:  186, btch:  31 usd: 149   Cold: hi:   62, btch:  15
usd:  50

HighMem per-cpu:

CPU    0: Hot: hi:  186, btch:  31 usd:  53   Cold: hi:   62, btch:  15
usd:  14

CPU    1: Hot: hi:  186, btch:  31 usd: 181   Cold: hi:   62, btch:  15
usd:  11

Active:486821 inactive:222382 dirty:1086 writeback:43 unstable:0
free:1236121 slab:125422 mapped:5242 pagetables:1068 bounce:0

DMA free:3508kB min:68kB low:84kB high:100kB active:4kB inactive:0kB
present:16256kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]:
0 873 8874 8874

Normal free:122668kB min:3744kB low:4680kB high:5616kB active:85852kB
inactive:111552kB present:894080kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 64008 64008

HighMem free:4818308kB min:512kB low:9096kB high:17684kB
active:1861428kB inactive:777976kB present:8193024kB pages_scanned:0
all_unreclaimable? no lowmem_reserve[]: 0 0 0 0

DMA: 137*4kB 48*8kB 32*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB
0*1024kB 1*2048kB 0*4096kB = 3492kB

Normal: 30507*4kB 1*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 1*512kB
0*1024kB 0*2048kB 0*4096kB = 122628kB

HighMem: 6664*4kB 14962*8kB 19387*16kB 19951*32kB 10681*64kB 4402*128kB
1783*256kB 819*512kB 323*1024kB 200*2048kB 210*4096kB = 4818304kB

Swap cache: add 1, delete 0, find 0/0, race 0+0

Free swap  = 1951884kB

Total swap = 1951888kB

Free swap:       1951884kB

2293759 pages of RAM

2064383 pages of HIGHMEM

216253 reserved pages

341800 pages shared

1 pages swap cached

1086 pages dirty

43 pages writeback

5242 pages mapped

125038 pages slab

1068 pages pagetables

-- 
swapper: page allocation failure
https://bugs.launchpad.net/bugs/296275
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