linux-kernel - Re: [crash] Re: Latest brk patchset

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Message-ID: <49BE97B0.8000004@kernel.org>
Date:	Mon, 16 Mar 2009 11:17:20 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash] Re: Latest brk patchset

Jeremy Fitzhardinge wrote:
> Yinghai Lu wrote:
>> could be max_pfn_mapped change in head_32.S that reduce mapping range
>> to _end only.
>>   
> 
> Yes, I would say you're right.  Trimming the mapping to _end only leaves
> the space under the kernel avaliable for allocating pagetable from e820
> space.  In this case we've got DEBUG_PAGEALLOC enabled, which inhibits
> the use of PSE, and BIOS corruption checking on, which eats a chunk of
> low memory.  In combination, there's only 0x8f000 bytes free below the
> kernel, and it needs 0xe1000 to allocate for pagetables.
> 
> Reverting 2bd2753ff46346543ab92e80df9d96366e21baa5 fixes the problem for
> me, though it does result in a kernel with a 73MB BSS...
> 

need more extra check for INIT_MAP_SIZE calculating...

YH



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