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

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Message-ID: <49BEB5FE.7050601@zytor.com>
Date:	Mon, 16 Mar 2009 13:26:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash] Re: Latest brk patchset

Jeremy Fitzhardinge wrote:
> Yinghai Lu wrote:
>>> -INIT_MAP_SIZE = (PAGE_TABLE_SIZE + ALLOCATOR_SLOP) * PAGE_SIZE_asm
>>> -RESERVE_BRK(pagetables, INIT_MAP_SIZE)
>>> +/* Enough space to fit pagetables for the low memory linear map */
>>> +MAPPING_BEYOND_END = (PAGE_TABLE_SIZE(1 << (32 - PAGE_SHIFT)) * 
>>> PAGE_SIZE)
>>>     
>>
>> that is for 4g?
>>   
> 
> Yes, I suppose it only needs to be 1G.  But it doesn't make much 
> difference in practice.
> 

A tighter bound would probably be nice, if nothing else because tighter 
bounds tend to catch more bugs.

	-hpa

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