Re: [Bug 12832] New: kernel leaks a lot of memory

[Pierre Ossman <drzeus@drzeus.cx>]

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On Sat, 7 Mar 2009 12:24:52 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:

> 
> hm, not a lot to go on there.
> 
> We have quite a lot of instrumentation for memory consumption - were
> you able to work out where it went by comparing /proc/meminfo,
> /proc/slabinfo, `echo m > /proc/sysrq-trigger', etc?
> 

The redhat entry contains all the info, and I've compared meminfo and
slabinfo without finding anything even close to the chunks of lost
memory.

I've attached the sysrq memory stats from 2.6.26 and 2.6.27. The only
difference though is in the reported free pages

I'm not very familiar with all the instrumentation, so pointers are
very welcome.

> Is the memory missing on initial boot up, or does it take some time for
> the problem to become evident?
> 

Initial boot as far as I can tell.


Rgds
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Linux builder.drzeus.cx 2.6.26.6-79.fc9.x86_64 #1 SMP Fri Oct 17 14:20:33 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
SysRq : Show Memory
Mem-info:
Node 0 DMA per-cpu:
CPU    0: hi:    0, btch:   1 usd:   0
Node 0 DMA32 per-cpu:
CPU    0: hi:  186, btch:  31 usd: 115
Active:8937 inactive:6285 dirty:48 writeback:0 unstable:0
 free:103730 slab:5612 mapped:2148 pagetables:817 bounce:0
Node 0 DMA free:10292kB min:48kB low:60kB high:72kB active:0kB inactive:0kB present:8908kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 489 489 489
Node 0 DMA32 free:404628kB min:2804kB low:3504kB high:4204kB active:35748kB inactive:25140kB present:500896kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 3*4kB 5*8kB 4*16kB 4*32kB 3*64kB 3*128kB 3*256kB 3*512kB 3*1024kB 2*2048kB 0*4096kB = 10292kB
Node 0 DMA32: 3*4kB 5*8kB 2*16kB 2*32kB 2*64kB 1*128kB 3*256kB 2*512kB 3*1024kB 3*2048kB 96*4096kB = 404628kB
9730 total pagecache pages
Swap cache: add 0, delete 0, find 0/0
Free swap  = 524280kB
Total swap = 524280kB
131056 pages of RAM
3772 reserved pages
7750 pages shared
0 pages swap cached


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Linux builder.drzeus.cx 2.6.27.4-19.fc9.x86_64 #1 SMP Thu Oct 30 19:30:01 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
SysRq : Show Memory
Mem-Info:
Node 0 DMA per-cpu:
CPU    0: hi:    0, btch:   1 usd:   0
Node 0 DMA32 per-cpu:
CPU    0: hi:  186, btch:  31 usd:  86
Active:8879 inactive:6265 dirty:8 writeback:0 unstable:0
 free:62265 slab:5543 mapped:2154 pagetables:821 bounce:0
Node 0 DMA free:9448kB min:40kB low:48kB high:60kB active:0kB inactive:0kB present:7804kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 489 489 489
Node 0 DMA32 free:239612kB min:2808kB low:3508kB high:4212kB active:35516kB inactive:25060kB present:500896kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 4*4kB 3*8kB 2*16kB 5*32kB 4*64kB 2*128kB 2*256kB 2*512kB 3*1024kB 2*2048kB 0*4096kB = 9448kB
Node 0 DMA32: 1*4kB 7*8kB 6*16kB 1*32kB 1*64kB 4*128kB 3*256kB 3*512kB 1*1024kB 3*2048kB 56*4096kB = 239612kB
9692 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 524280kB
Total swap = 524280kB
131056 pages RAM
4046 pages reserved
7770 pages shared
61196 pages non-shared


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