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

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Date:	Fri, 10 Jul 2009 21:18:01 +0800
From:	Wu Fengguang <fengguang.wu@...il.com>
To:	John Stoffel <john@...ffel.org>
Cc:	Gene Heskett <gene.heskett@...izon.net>,
	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 Fri, Jul 10, 2009 at 09:09:48AM -0400, John Stoffel wrote:
> >>>>> "Gene" == Gene Heskett <gene.heskett@...izon.net> writes:
> 
> Gene> 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?
> Gene> 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.
> 
> Gene> I am short approximately 500 megs according to top:
> Gene> Mem:   3634228k total,  3522984k used,   111244k free,   308096k buffers
> Gene> Swap:  8385912k total,      568k used,  8385344k free,  2544716k cached
> 
> Gene> From dmesg:
> Gene> [    0.000000] TOM2: 0000000120000000 aka 4608M  <what is this?
> Gene> [...]
> Gene> [    0.000000] 2694MB HIGHMEM available.
> Gene> [    0.000000] 887MB LOWMEM available.
> 
> Gene> 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.
> 
> Gene> I had been running the original bios, #1502, because 1604 and
> Gene> 1701 had very poor uptimes.  1502 caused an oops about 15 lines
> Gene> into the boot but that triggered a remap and it was bulletproof
> Gene> after that running a 32 bit 64G+PAE kernel.  (I haven't quite
> Gene> made the jump to a 64 bit install, yet...)
> 
> Why haven't you made the laep to 64bit yet?  To me, that seems to be
> the real solution here, not hacks like the HIGHMEM4G and HIGHMEM64G,
> esp when your hardware is 64Bit by default.  

Sure 64bit kernel would be the best option for Gene :)

> I've made the leap and I've never looked back.  Haven't missed any
> 32bit only apps, and if I really needed them, I'd just load the 32bit
> libraries if need be.

But for now I'd appreciate a lot if Gene can run a HIGHMEM64G kernel
with the provided patch, so as to collect one full OOM message for us
to analyze :) The previous OOM message missed the most important data
from zone Normal..

Thanks,
Fengguang
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