Hi ,
I noticed the OOM killer while running the hackbench tests in zSeries.
The machine had memory of 2GB and swap space of 1GB.
While running the 'hackbench 300' noticed this OOMs.
I used the z9 Lpar box to test this.
It utilised the swap mem upto 500 MB, though it had upto 1GB of swap !
[EMAIL PROTECTED] ~]# cat /etc/issue
Red Hat Enterprise Linux Server release 5.2 (Tikanga)
Kernel \r on an \m
[EMAIL PROTECTED] ~]# uname -a
Linux veeru-s390 2.6.18-117.el5 #1 SMP Tue Sep 30 20:27:56 CEST 2008
s390x s390x s390x GNU/Linux
Every 2.0s: free -mo
Tue Oct 7 11:29:23 2008
total used free shared buffers cached
Mem: 2008 1997 11 0 1 3
Swap: 1023 484 539
Oct 7 11:07:05 veeru-s390 kernel: Out of memory: Killed process 11088
(hackbench).
Oct 7 11:09:46 veeru-s390 kernel: hackbench invoked oom-killer:
gfp_mask=0xd0, order=2, oomkilladj=0
Oct 7 11:09:46 veeru-s390 kernel: 0000000062957ac0 0000000062957ac0
0000000000000002 0000000000000000
Oct 7 11:09:46 veeru-s390 kernel: 0000000062957b60
0000000062957ad8 0000000062957ad8 000000000003cb9e
Oct 7 11:09:46 veeru-s390 kernel: 0000000000005409
0000000000000000 0000000000000000 000000000000000b
Oct 7 11:09:46 veeru-s390 kernel: 0000000000000008
0000000000000000 0000000062957ac0 0000000062957b38
Oct 7 11:09:46 veeru-s390 kernel: 000000000025fb80
0000000000016586 0000000062957ac0 0000000062957b10
Oct 7 11:09:46 veeru-s390 kernel: Call Trace:
Oct 7 11:09:46 veeru-s390 kernel: ([<00000000000164de>]
show_trace+0x11e/0x130)
Oct 7 11:09:46 veeru-s390 kernel: [<000000000008817c>]
out_of_memory+0x94/0x264
Oct 7 11:09:46 veeru-s390 kernel: [<0000000000089fdc>]
__alloc_pages+0x280/0x314
Oct 7 11:09:46 veeru-s390 kernel: [<000000000008a0de>]
__get_free_pages+0x6e/0xa4
Oct 7 11:09:46 veeru-s390 kernel: [<000000000009386a>]
__pmd_alloc+0x32/0xd4
Oct 7 11:09:46 veeru-s390 kernel: [<00000000000958b8>]
copy_page_range+0x12c/0x618
Oct 7 11:09:46 veeru-s390 kernel: [<000000000003a912>]
copy_process+0xe5a/0x1724
Oct 7 11:09:46 veeru-s390 kernel: [<000000000003b250>] do_fork+0x74/0x1f4
Oct 7 11:09:46 veeru-s390 kernel: [<000000000001887c>]
sys_clone+0x50/0x60
Oct 7 11:09:46 veeru-s390 kernel: [<00000000000208f0>]
sysc_tracego+0xe/0x14
Oct 7 11:09:46 veeru-s390 kernel: [<0000004e5b3aa326>] 0x4e5b3aa326
Oct 7 11:09:46 veeru-s390 kernel:
Oct 7 11:09:46 veeru-s390 kernel: Mem-info:
Oct 7 11:09:46 veeru-s390 kernel: DMA per-cpu:
Oct 7 11:09:46 veeru-s390 kernel: cpu 0 hot: high 186, batch 31 used:136
Oct 7 11:09:46 veeru-s390 kernel: cpu 0 cold: high 62, batch 15 used:54
Oct 7 11:09:46 veeru-s390 kernel: cpu 1 hot: high 186, batch 31 used:158
Oct 7 11:09:46 veeru-s390 kernel: cpu 1 cold: high 62, batch 15 used:49
Oct 7 11:09:46 veeru-s390 kernel: cpu 2 hot: high 186, batch 31 used:177
Oct 7 11:09:46 veeru-s390 kernel: cpu 2 cold: high 62, batch 15 used:50
Oct 7 11:09:46 veeru-s390 kernel: cpu 3 hot: high 186, batch 31 used:121
Oct 7 11:09:46 veeru-s390 kernel: cpu 3 cold: high 62, batch 15 used:58
Oct 7 11:09:46 veeru-s390 kernel: DMA32 per-cpu: empty
Oct 7 11:09:46 veeru-s390 kernel: Normal per-cpu: empty
Oct 7 11:09:46 veeru-s390 kernel: HighMem per-cpu: empty
Oct 7 11:09:46 veeru-s390 kernel: Free pages: 194560kB (0kB HighMem)
Oct 7 11:09:46 veeru-s390 kernel: Active:146742 inactive:588 dirty:0
writeback:0 unstable:0 free:48640 slab:40794 mapped-file:1
mapped-anon:146166 pagetables:47218
Oct 7 11:09:46 veeru-s390 kernel: DMA free:194560kB min:5792kB
low:7240kB high:8688kB active:586896kB inactive:2352kB present:2097152kB
pages_scanned:1045101 all_unreclaimable? yes
Oct 7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
Oct 7 11:09:46 veeru-s390 kernel: DMA32 free:0kB min:0kB low:0kB
high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0
all_unreclaimable? no
Oct 7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
Oct 7 11:09:46 veeru-s390 kernel: Normal free:0kB min:0kB low:0kB
high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0
all_unreclaimable? no
Oct 7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
Oct 7 11:09:46 veeru-s390 kernel: HighMem free:0kB min:128kB low:128kB
high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0
all_unreclaimable? no
Oct 7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
Oct 7 11:09:46 veeru-s390 kernel: DMA: 27830*4kB 10223*8kB 1*16kB
1*32kB 0*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 194560kB
Oct 7 11:09:46 veeru-s390 kernel: DMA32: empty
Oct 7 11:09:46 veeru-s390 kernel: Normal: empty
Oct 7 11:09:46 veeru-s390 kernel: HighMem: empty
Oct 7 11:09:46 veeru-s390 kernel: 1208 pagecache pages
Oct 7 11:09:46 veeru-s390 kernel: Swap cache: add 0, delete 0, find
0/0, race 0+0
Oct 7 11:09:46 veeru-s390 kernel: Free swap = 0kB
Oct 7 11:09:46 veeru-s390 kernel: Total swap = 0kB
Oct 7 11:09:46 veeru-s390 kernel: Free swap: 0kB
Oct 7 11:09:46 veeru-s390 kernel: 524288 pages of RAM
Oct 7 11:09:46 veeru-s390 kernel: 10013 reserved pages
Oct 7 11:09:46 veeru-s390 kernel: 406538 pages shared
Oct 7 11:09:46 veeru-s390 kernel: 0 pages swap cached
But while running the hackbench in x86_64 , the testcase quit,
displaying error "fork() (error: Cannot allocate memory) "
Regards, Veerendra C
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