Re: dentry_cache using up all my zone normal memory -- also seen on 2.6.14-rc2

["Christopher Friesen" <cfriesen@nortel.com>]

Just for kicks I tried with 2.6.14-rc2, and got the same behaviour. 
/proc/slabinfo gives the following two high-runners within a second of 
the oom-killer running:

dentry_cache      3894397 3894961    136   29    1 : tunables  120   60 
   0 : slabdata 134307 134309      0
filp              1216820 1216980    192   20    1 : tunables  120   60 
   0 : slabdata  60844  60849      0


The oom killer gave the following output:


oom-killer: gfp_mask=0xd0, order=0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:2
cpu 0 cold: low 0, high 2, batch 1 used:0
Normal per-cpu:
cpu 0 hot: low 62, high 186, batch 31 used:92
cpu 0 cold: low 0, high 62, batch 31 used:0
HighMem per-cpu:
cpu 0 hot: low 62, high 186, batch 31 used:161
cpu 0 cold: low 0, high 62, batch 31 used:19
Free pages:     2486564kB (2479256kB HighMem)
Active:2064 inactive:392 dirty:2 writeback:0 unstable:0 free:621641 
slab:216703 mapped:1715 pagetables:91
DMA free:3588kB min:68kB low:84kB high:100kB active:0kB inactive:0kB 
present:16384kB pages_scanned:18 all_unreclaimable? yes
lowmem_reserve[]: 0 880 4080
Normal free:3720kB min:3756kB low:4692kB high:5632kB active:0kB 
inactive:0kB present:901120kB pages_scanned:18 all_unreclaimable? yes
lowmem_reserve[]: 0 0 25600
HighMem free:2479256kB min:512kB low:640kB high:768kB active:8256kB 
inactive:1568kB present:3276800kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 1*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 
1*2048kB 0*4096kB = 3588kB
Normal: 0*4kB 1*8kB 0*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 
1*1024kB 1*2048kB 0*4096kB = 3720kB
HighMem: 270*4kB 156*8kB 108*16kB 92*32kB 61*64kB 28*128kB 4*256kB 
0*512kB 0*1024kB 1*2048kB 601*4096kB = 2479256kB
Free swap:            0kB
1048576 pages of RAM
819200 pages of HIGHMEM
205960 reserved pages
4543 pages shared
0 pages swap cached
2 pages dirty
0 pages writeback
1715 pages mapped
216546 pages slab
91 pages pagetables
Out of Memory: Killed process 444 (portmap).
oom-killer: gfp_mask=0xd0, order=0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:2
cpu 0 cold: low 0, high 2, batch 1 used:0
Normal per-cpu:
cpu 0 hot: low 62, high 186, batch 31 used:92
cpu 0 cold: low 0, high 62, batch 31 used:0
HighMem per-cpu:
cpu 0 hot: low 62, high 186, batch 31 used:182
cpu 0 cold: low 0, high 62, batch 31 used:19
Free pages:     2486564kB (2479256kB HighMem)
Active:2043 inactive:392 dirty:7 writeback:0 unstable:0 free:621641 
slab:216707 mapped:1681 pagetables:88
DMA free:3588kB min:68kB low:84kB high:100kB active:0kB inactive:0kB 
present:16384kB pages_scanned:34 all_unreclaimable? yes
lowmem_reserve[]: 0 880 4080
Normal free:3720kB min:3756kB low:4692kB high:5632kB active:0kB 
inactive:0kB present:901120kB pages_scanned:16 all_unreclaimable? yes
lowmem_reserve[]: 0 0 25600
HighMem free:2479256kB min:512kB low:640kB high:768kB active:8172kB 
inactive:1568kB present:3276800kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 1*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 
1*2048kB 0*4096kB = 3588kB
Normal: 0*4kB 1*8kB 0*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 
1*1024kB 1*2048kB 0*4096kB = 3720kB
HighMem: 270*4kB 156*8kB 108*16kB 92*32kB 61*64kB 28*128kB 4*256kB 
0*512kB 0*1024kB 1*2048kB 601*4096kB = 2479256kB
Free swap:            0kB
1048576 pages of RAM
819200 pages of HIGHMEM
205960 reserved pages
4479 pages shared
0 pages swap cached
7 pages dirty
0 pages writeback
1681 pages mapped
216521 pages slab
88 pages pagetables
Out of Memory: Killed process 803 (sshd).


Chris
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