linux-kernel - Re: [RFC] Reproducible OOM with just a few sleeps

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Message-ID: <50F8734C.2080906@linux.vnet.ibm.com>
Date:	Thu, 17 Jan 2013 13:55:24 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	paul.szabo@...ney.edu.au
CC:	psz@...hs.usyd.edu.au, 695182@...s.debian.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC] Reproducible OOM with just a few sleeps

On 01/17/2013 01:04 PM, paul.szabo@...ney.edu.au wrote:
>>> On my large machine, 'free' fails to show about 2GB memory ...
>> You probably have a memory hole. ...
>> The e820 map (during early boot in dmesg) or /proc/iomem will let you
>> locate your memory holes.
> 
> Now that my machine is running an amd64 kernel, 'free' shows total Mem
> 65854128 (up from 64447796 with PAE kernel), and I do not see much
> change in /proc/iomem output (below). Is that as should be?

Yeah, that all looks sane.  Your increased memory is because your 64GB
machine had some of its memory mapped _above_ the 64GB physical memory
limit that PAE has.

/proc/iomem is generally just a dump of what the hardware *is*, so it
shouldn't change between kernels.

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