linux-kernel - Re: 2.6.32-rc3: low mem - only 378MB on x86

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Message-Id: <1255019748.9915.1389.camel@nimitz>
Date:	Thu, 08 Oct 2009 09:35:48 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, Tomasz Chmielewski <mangoo@...g.org>,
	Daniel J Blueman <daniel.blueman@...il.com>,
	Byron Stanoszek <bstanoszek@...time.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?

On Fri, 2009-10-09 at 00:26 +0800, Jeff Chua wrote:
> Newly compiled 64-bit kernel hangs on a previously working pure 32-bit
> 2.6.32-rc3 system ...
> 
> VFS: Mounted root (reiserfs filesystem) readonly on device 8:2.
> Freeing unused kernel memory: 444k freed
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c

Take a quick look in your .config in the "Executable file formats /
Emulations" section.  Make sure that you have ia32 emulation enabled:

CONFIG_IA32_EMULATION=y

That might not have been turned on if you used a .config from an old
32-bit kernel.  

-- Dave

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