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

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Message-ID: <49BE98FB.9050406@zytor.com>
Date:	Mon, 16 Mar 2009 11:22:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash] Re: Latest brk patchset

Yinghai Lu wrote:
> 
> need more extra check for INIT_MAP_SIZE calculating...
> 

The original calculation was designed to map enough memory that we could 
map all of lowmem.  That is, two page table levels removed from actual 
lowmem, which put the overhead in the order of kilobytes (16 K in the 
wost case.)  Something similar is definitely needed.

	-hpa

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