linux-kernel - Re: OOM killer in 2.6.31-rc2

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Message-id: <200907091703.06691.gene.heskett@verizon.net>
Date:	Thu, 09 Jul 2009 17:03:06 -0400
From:	Gene Heskett <gene.heskett@...izon.net>
To:	"John Stoffel" <john@...ffel.org>
Cc:	Wu Fengguang <fengguang.wu@...il.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Minchan Kim <minchan.kim@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: OOM killer in 2.6.31-rc2

On Thursday 09 July 2009, John Stoffel wrote:
>>>>>> "Gene" == Gene Heskett <gene.heskett@...izon.net> writes:
>
>Gene> On Wednesday 08 July 2009, Wu Fengguang wrote:
>>> On Wed, Jul 08, 2009 at 01:15:15PM +0800, Wu Fengguang wrote:
>>>> On Tue, Jul 07, 2009 at 11:42:07PM -0400, Gene Heskett wrote:
>
>Gene> [...]
>
>>>> I guess your near 800MB slab cache is somehow under scanned.
>>>
>>> Gene, can you run .31 with this patch? When OOM happens, it will tell
>>> us whether the majority slab pages are reclaimable. Another way to
>>> find things out is to run `slabtop` when your system is moderately
>>> loaded.
>
>Gene> Its been running continuously, and after 24 hours is now showing:
>
>Just wondering, is this your M2N-SLI Deluxe board?
Yes.
>I've got the same
>board, with 4Gb of RAM and I haven't noticed any loss of RAM from my
>looking (quickly) at top output.

I am short approximately 500 megs according to top:
Mem:   3634228k total,  3522984k used,   111244k free,   308096k buffers
Swap:  8385912k total,      568k used,  8385344k free,  2544716k cached

>From dmesg:
[    0.000000] TOM2: 0000000120000000 aka 4608M  <what is this?
[...]
[    0.000000] 2694MB HIGHMEM available.
[    0.000000] 887MB LOWMEM available.

The bios signon does say 4092M IIRC.

>But I also haven't bothered to upgrade the BIOS on this board at all
>since I got it back in March of 2008.  No need in my book so far.

I had been running the original bios, #1502, because 1604 and 1701 had very 
poor uptimes.  1502 caused an oops about 15 lines into the boot but that 
triggered a remap and it was bulletproof after that running a 32 bit 64G+PAE 
kernel.  (I haven't quite made the jump to a 64 bit install, yet...)

>> uname -a
>
>Linux sail 2.6.31-rc1 #6 SMP PREEMPT Wed Jun 24 21:40:33 EDT 2009 x86_64
> GNU/Linux

Linux coyote.coyote.den 2.6.31-rc2 #4 SMP PREEMPT Wed Jul 8 09:37:15 EDT 2009 
i686 athlon i386 GNU/Linux
>> cat /proc/meminfo
>
>MemTotal:        3987068 kB
>MemFree:          170608 kB
>Buffers:          355272 kB
>Cached:          2034416 kB
>SwapCached:            0 kB
>Active:          1836284 kB
>Inactive:        1482444 kB
>Active(anon):     857076 kB
>Inactive(anon):    86112 kB
>Active(file):     979208 kB
>Inactive(file):  1396332 kB
>Unevictable:        3972 kB
>Mlocked:            3972 kB
>SwapTotal:             0 kB
>SwapFree:              0 kB
>Dirty:                36 kB
>Writeback:             0 kB
>AnonPages:        933160 kB
>Mapped:           141188 kB
>Slab:             398124 kB
>SReclaimable:     348212 kB
>SUnreclaim:        49912 kB
>PageTables:        30916 kB
>NFS_Unstable:          0 kB
>Bounce:                0 kB
>WritebackTmp:          0 kB
>CommitLimit:     1993532 kB
>Committed_AS:    1570980 kB
>VmallocTotal:   34359738367 kB
>VmallocUsed:      116160 kB
>VmallocChunk:   34359584603 kB
>DirectMap4k:        4992 kB
>DirectMap2M:     4188160 kB

MemTotal:        3634228 kB
MemFree:          114312 kB
Buffers:          309088 kB
Cached:          2541864 kB
SwapCached:           72 kB
Active:          1584988 kB
Inactive:        1739508 kB
Active(anon):     354584 kB
Inactive(anon):   120072 kB
Active(file):    1230404 kB
Inactive(file):  1619436 kB
Unevictable:         100 kB
Mlocked:             100 kB
HighTotal:       2759560 kB
HighFree:          13020 kB
LowTotal:         874668 kB
LowFree:          101292 kB
SwapTotal:       8385912 kB
SwapFree:        8385344 kB
Dirty:                52 kB
Writeback:             0 kB
AnonPages:        473576 kB
Mapped:           111332 kB
Slab:             143624 kB
SReclaimable:     127820 kB
SUnreclaim:        15804 kB
PageTables:         8776 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    10203024 kB
Committed_AS:    1029032 kB
VmallocTotal:     122880 kB
VmallocUsed:       44180 kB
VmallocChunk:      65924 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       4096 kB
DirectMap4k:        8184 kB
DirectMap4M:      901120 kB

Huge diffs it appears. ??

Thanks, John.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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