Description of problem:
While creating devspaces for MaxDB 7.5.0 oom kills MaxDB processes/threads after
30-50GB were written to disk. Enabling USE_OPEN_DIRECT on MaxDB works fine,
although after 20GB the writing speed drops from 70MB/sec to 2MB/sec.


Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-11.EL


How reproducible:
Everytime

Steps to Reproduce:
1. Download MaxDB 7.5 from http://dev.mysql.com/downloads/maxdb/7.5.00.html
2. Install software wich SDBINST
3. Modify create_demo_db.sh script: replace "param_addvolume 1 DATA DISKD0001 F
2560" with "param_addvolume 1 DATA DISKD0001 F 8544921" (which is around 70GB in
8k blocks).
4. start the script

  
Actual results:
All MaxDB processes/threads were killed by oom


Expected results:
oom doing nothing...

Additional info:
Hardware information:

Dell PowerEdge 6650
4 x 3Ghz Xeon HT
RAID bus controller: LSI Logic / Symbios Logic MegaRAID (rev 01)
external SCSI enclosure with 12x36GB disks (RAID 5)

Software information:

# lsmod
Module                  Size  Used by
nfs                   200869  1
lockd                  65257  2 nfs
vfat                   16961  0
fat                    44129  1 vfat
md5                     8001  1
ipv6                  238817  28
autofs4                22085  0
i2c_dev                14273  0
i2c_core               25921  1 i2c_dev
sunrpc                138789  4 nfs,lockd
dm_mod                 58949  0
button                 10449  0
battery                12869  0
ac                      8773  0
tg3                    82373  0
floppy                 58065  0
sg                     38113  0
ext3                  118729  3
jbd                    59481  1 ext3
qla2300               126529  0
qla2xxx               109665  1 qla2300
scsi_transport_fc      11712  1 qla2xxx
megaraid_mbox          38097  4
megaraid_mm            17905  1 megaraid_mbox
aic7xxx               146553  0
sd_mod                 20545  6
scsi_mod              116429  6
sg,qla2xxx,scsi_transport_fc,megaraid_mbox,aic7xxx,sd_mod

#dmesg
oom-killer: gfp_mask=0xd0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1
cpu 0 cold: low 0, high 2, batch 1
cpu 1 hot: low 2, high 6, batch 1
cpu 1 cold: low 0, high 2, batch 1
cpu 2 hot: low 2, high 6, batch 1
cpu 2 cold: low 0, high 2, batch 1
cpu 3 hot: low 2, high 6, batch 1
cpu 3 cold: low 0, high 2, batch 1
cpu 4 hot: low 2, high 6, batch 1
cpu 4 cold: low 0, high 2, batch 1
cpu 5 hot: low 2, high 6, batch 1
cpu 5 cold: low 0, high 2, batch 1
cpu 6 hot: low 2, high 6, batch 1
cpu 6 cold: low 0, high 2, batch 1
cpu 7 hot: low 2, high 6, batch 1
cpu 7 cold: low 0, high 2, batch 1
Normal per-cpu:
cpu 0 hot: low 32, high 96, batch 16
cpu 0 cold: low 0, high 32, batch 16
cpu 1 hot: low 32, high 96, batch 16
cpu 1 cold: low 0, high 32, batch 16
cpu 2 hot: low 32, high 96, batch 16
cpu 2 cold: low 0, high 32, batch 16
cpu 3 hot: low 32, high 96, batch 16
cpu 3 cold: low 0, high 32, batch 16
cpu 4 hot: low 32, high 96, batch 16
cpu 4 cold: low 0, high 32, batch 16
cpu 5 hot: low 32, high 96, batch 16
cpu 5 cold: low 0, high 32, batch 16
cpu 6 hot: low 32, high 96, batch 16
cpu 6 cold: low 0, high 32, batch 16
cpu 7 hot: low 32, high 96, batch 16
cpu 7 cold: low 0, high 32, batch 16
HighMem per-cpu:
cpu 0 hot: low 32, high 96, batch 16
cpu 0 cold: low 0, high 32, batch 16
cpu 1 hot: low 32, high 96, batch 16
cpu 1 cold: low 0, high 32, batch 16
cpu 2 hot: low 32, high 96, batch 16
cpu 2 cold: low 0, high 32, batch 16
cpu 3 hot: low 32, high 96, batch 16
cpu 3 cold: low 0, high 32, batch 16
cpu 4 hot: low 32, high 96, batch 16
cpu 4 cold: low 0, high 32, batch 16
cpu 5 hot: low 32, high 96, batch 16
cpu 5 cold: low 0, high 32, batch 16
cpu 6 hot: low 32, high 96, batch 16
cpu 6 cold: low 0, high 32, batch 16
cpu 7 hot: low 32, high 96, batch 16
cpu 7 cold: low 0, high 32, batch 16

Free pages:       15136kB (1600kB HighMem)
Active:285350 inactive:1668227 dirty:219220 writeback:113476 unstable:0
free:3784 slab:49928 mapped:283285 pagetables:1789
DMA free:12640kB min:16kB low:32kB high:48kB active:0kB inactive:0kB
present:16384kB pages_scanned:20983 all_unreclaimable? yes
protections[]: 0 0 0
Normal free:896kB min:928kB low:1856kB high:2784kB active:8252kB
inactive:615108kB present:901120kB pages_scanned:817047 all_unreclaimable? yes
protections[]: 0 0 0
HighMem free:1600kB min:512kB low:1024kB high:1536kB active:1133148kB
inactive:6057800kB present:7471104kB pages_scanned:0 all_unreclaimable? no
protections[]: 0 0 0
DMA: 4*4kB 4*8kB 3*16kB 4*32kB 4*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB
2*4096kB = 12640kB
Normal: 0*4kB 104*8kB 4*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB
0*2048kB 0*4096kB = 896kB
HighMem: 98*4kB 39*8kB 22*16kB 1*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB
0*2048kB 0*4096kB = 1600kB
Swap cache: add 21638, delete 21560, find 413/618, race 0+0
Free swap:       10190220kB
2097152 pages of RAM
1802208 pages of HIGHMEM
83433 reserved pages
1695143 pages shared
78 pages swap cached
Out of Memory: Killed process 3505 (kernel).
Out of Memory: Killed process 3506 (kernel).
Out of Memory: Killed process 3507 (kernel).
Out of Memory: Killed process 3508 (kernel).
Out of Memory: Killed process 3509 (kernel).
Out of Memory: Killed process 3510 (kernel).
Out of Memory: Killed process 3511 (kernel).
Out of Memory: Killed process 3512 (kernel).
Out of Memory: Killed process 3513 (kernel).
Out of Memory: Killed process 3514 (kernel).
Out of Memory: Killed process 3515 (kernel).
Out of Memory: Killed process 3516 (kernel).
Out of Memory: Killed process 3517 (kernel).
Out of Memory: Killed process 3518 (kernel).
Out of Memory: Killed process 3519 (kernel).
Out of Memory: Killed process 3520 (kernel).
Out of Memory: Killed process 3521 (kernel).
Out of Memory: Killed process 3522 (kernel).
Out of Memory: Killed process 3523 (kernel).
Out of Memory: Killed process 3524 (kernel).
Out of Memory: Killed process 3525 (kernel).
Out of Memory: Killed process 3526 (kernel).
Out of Memory: Killed process 3527 (kernel).
Out of Memory: Killed process 3528 (kernel).
Out of Memory: Killed process 3535 (kernel).
Out of Memory: Killed process 3536 (kernel).
Out of Memory: Killed process 3539 (kernel).
Out of Memory: Killed process 3540 (kernel).
Out of Memory: Killed process 3737 (kernel).
Out of Memory: Killed process 3738 (kernel).
Fixed up OOM kill of mm-less task