linux-kernel - Re: VM/VFS bug with large amount of memory and file systems?

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Message-Id: <1189850897.21778.301.camel@twins>
Date:	Sat, 15 Sep 2007 12:08:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Anton Altaparmakov <aia21@....ac.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	marc.smith@...ail.mcc.edu
Subject: Re: VM/VFS bug with large amount of memory and file systems?

On Sat, 2007-09-15 at 08:27 +0100, Anton Altaparmakov wrote:

Please, don't word wrap log-files, they're hard enough to read without
it :-(

( I see people do this more and more often, *WHY*? is that because we
like 80 char lines, in code and email? )


Anyway, looks like all of zone_normal is pinned in kernel allocations:

> Sep 13 15:31:25 escabot Normal free:3648kB min:3744kB low:4680kB high: 5616kB active:0kB inactive:3160kB present:894080kB pages_scanned:5336 all_unreclaimable? yes

Out of the 870 odd mb only 3 is on the lru.

Would be grand it you could have a look at slabinfo and the like.

Peter

---

> Sep 13 15:31:25 escabot init invoked oom-killer: gfp_mask=0xd0,  
> order=0, oomkilladj=0
> Sep 13 15:31:25 escabot [<c0149ea8>] out_of_memory+0x158/0x1b0
> Sep 13 15:31:25 escabot [<c014b7b0>] __alloc_pages+0x2a0/0x300
> Sep 13 15:31:25 escabot [<c01729aa>] core_sys_select+0x1fa/0x2f0
> Sep 13 15:31:25 escabot [<c0162a21>] cache_alloc_refill+0x2e1/0x500
> Sep 13 15:31:25 escabot [<c0162736>] kmem_cache_alloc+0x46/0x50
> Sep 13 15:31:25 escabot [<c016e238>] getname+0x28/0xf0
> Sep 13 15:31:25 escabot [<c016fe5e>] __user_walk_fd+0x1e/0x60
> Sep 13 15:31:25 escabot [<c0168e29>] cp_new_stat64+0xf9/0x110
> Sep 13 15:31:25 escabot [<c0169152>] vfs_stat_fd+0x22/0x60
> Sep 13 15:31:25 escabot [<c016922f>] sys_stat64+0xf/0x30
> Sep 13 15:31:25 escabot [<c0124956>] do_gettimeofday+0x36/0xf0
> Sep 13 15:31:25 escabot [<c0120bbf>] sys_time+0xf/0x30
> Sep 13 15:31:25 escabot [<c0102b10>] sysenter_past_esp+0x5d/0x81
> Sep 13 15:31:25 escabot =======================
> Sep 13 15:31:25 escabot Mem-info:
> Sep 13 15:31:25 escabot DMA per-cpu:
> Sep 13 15:31:25 escabot CPU    0: Hot: hi:    0, btch:   1 usd:   0    
> Cold: hi:    0, btch:   1 usd:   0
> Sep 13 15:31:25 escabot CPU    1: Hot: hi:    0, btch:   1 usd:   0    
> Cold: hi:    0, btch:   1 usd:   0
> Sep 13 15:31:25 escabot CPU    2: Hot: hi:    0, btch:   1 usd:   0    
> Cold: hi:    0, btch:   1 usd:   0
> Sep 13 15:31:25 escabot CPU    3: Hot: hi:    0, btch:   1 usd:   0    
> Cold: hi:    0, btch:   1 usd:   0
> Sep 13 15:31:25 escabot Normal per-cpu:
> Sep 13 15:31:25 escabot CPU    0: Hot: hi:  186, btch:  31 usd: 143    
> Cold: hi:   62, btch:  15 usd:  56
> Sep 13 15:31:25 escabot CPU    1: Hot: hi:  186, btch:  31 usd:  31    
> Cold: hi:   62, btch:  15 usd:  53
> Sep 13 15:31:25 escabot CPU    2: Hot: hi:  186, btch:  31 usd:   8    
> Cold: hi:   62, btch:  15 usd:  54
> Sep 13 15:31:25 escabot CPU    3: Hot: hi:  186, btch:  31 usd:  99    
> Cold: hi:   62, btch:  15 usd:  58
> Sep 13 15:31:25 escabot HighMem per-cpu:
> Sep 13 15:31:25 escabot CPU    0: Hot: hi:  186, btch:  31 usd:   1    
> Cold: hi:   62, btch:  15 usd:  10
> Sep 13 15:31:25 escabot CPU    1: Hot: hi:  186, btch:  31 usd:  23    
> Cold: hi:   62, btch:  15 usd:   1
> Sep 13 15:31:25 escabot CPU    2: Hot: hi:  186, btch:  31 usd:  18    
> Cold: hi:   62, btch:  15 usd:   1
> Sep 13 15:31:25 escabot CPU    3: Hot: hi:  186, btch:  31 usd:   9    
> Cold: hi:   62, btch:  15 usd:  12
> Sep 13 15:31:25 escabot Active:8078 inactive:1776744 dirty:10338  
> writeback:0 unstable:0
> Sep 13 15:31:25 escabot free:1090395 slab:198893 mapped:988  
> pagetables:129 bounce:0
> Sep 13 15:31:25 escabot DMA free:3560kB min:68kB low:84kB high:100kB  
> active:0kB inactive:0kB present:16256kB pages_scanned:0  
> all_unreclaimable? yes
> Sep 13 15:31:25 escabot lowmem_reserve[]: 0 873 12176
> Sep 13 15:31:25 escabot Normal free:3648kB min:3744kB low:4680kB high: 
> 5616kB active:0kB inactive:3160kB present:894080kB pages_scanned:5336  
> all_unreclaimable? yes
> Sep 13 15:31:25 escabot lowmem_reserve[]: 0 0 90424
> Sep 13 15:31:25 escabot HighMem free:4354372kB min:512kB low:12640kB  
> high:24768kB active:32312kB inactive:7103816kB present:11574272kB  
> pages_scanned:0 all_unreclaimable? no
> Sep 13 15:31:25 escabot lowmem_reserve[]: 0 0 0
> Sep 13 15:31:25 escabot DMA: 4*4kB 3*8kB 0*16kB 0*32kB 1*64kB 1*128kB  
> 1*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3560kB
> Sep 13 15:31:25 escabot Normal: 44*4kB 18*8kB 6*16kB 1*32kB 6*64kB  
> 2*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 3648kB
> Sep 13 15:31:25 escabot HighMem: 1*4kB 0*8kB 0*16kB 37914*32kB  
> 43188*64kB 1628*128kB 5*256kB 247*512kB 30*1024kB 1*2048kB 2*4096kB =  
> 4354372kB
> Sep 13 15:31:25 escabot Swap cache: add 983, delete 972, find 0/1,  
> race 0+0
> Sep 13 15:31:25 escabot Free swap  = 2004216kB
> Sep 13 15:31:25 escabot Total swap = 2008116kB
> Sep 13 15:31:25 escabot Free swap:       2004216kB


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