Re: dentry_cache using up all my zone normal memory

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On Marcelo's suggestion, I modified the oom killer code to dump the stack. The dmesg output of the first process being killed is as follows:


oom-killer: gfp_mask=0xd0
 [<c0137701>] out_of_memory+0x51/0xb0
 [<c0138888>] __alloc_pages+0x3d8/0x3f0
 [<c01388bb>] __get_free_pages+0x1b/0x40
 [<c013bbc2>] kmem_getpages+0x22/0xb0
 [<c013c7d9>] cache_grow+0xa9/0x170
 [<c013ca4d>] cache_alloc_refill+0x1ad/0x1f0
 [<c013cc78>] kmem_cache_alloc+0x38/0x40
 [<c01655f1>] d_alloc+0x21/0x170
 [<c015b15d>] cached_lookup+0x7d/0x90
 [<c015c53d>] __lookup_hash+0x8d/0xe0
 [<c015c5ad>] lookup_hash+0x1d/0x30
 [<c015e737>] sys_rename+0x137/0x230
 [<c01106e0>] recalc_task_prio+0xc0/0x1c0
 [<c010250d>] sysenter_past_esp+0x52/0x75
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1
cpu 0 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
HighMem per-cpu:
cpu 0 hot: low 32, high 96, batch 16
cpu 0 cold: low 0, high 32, batch 16

Free pages:     2484556kB (2480576kB HighMem)
Active:1787 inactive:419 dirty:2 writeback:0 unstable:0 free:621139 slab:217642 mapped:1511 pagetables:102 DMA free:68kB min:68kB low:84kB high:100kB active:0kB inactive:0kB present:16384kB pages_scanned:0 all_unreclaimable? yes
protections[]: 0 0 0
Normal free:3912kB min:3756kB low:4692kB high:5632kB active:0kB inactive:0kB present:901120kB pages_scanned:0 all_unreclaimable? no
protections[]: 0 0 0
HighMem free:2480576kB min:512kB low:640kB high:768kB active:7148kB inactive:1676kB present:3276800kB pages_scanned:0 all_unreclaimable? no
protections[]: 0 0 0
DMA: 1*4kB 0*8kB 0*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 68kB Normal: 2*4kB 0*8kB 0*16kB 0*32kB 1*64kB 0*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 3912kB HighMem: 244*4kB 116*8kB 73*16kB 66*32kB 44*64kB 25*128kB 16*256kB 3*512kB 0*1024kB 1*2048kB 601*4096kB = 2480576kB
Out of Memory: Killed process 595 (portmap).
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