linux-kernel - Re: Latest brk patchset

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Message-ID: <49BC8955.5070009@zytor.com>
Date:	Sat, 14 Mar 2009 21:51:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Latest brk patchset

Yinghai Lu wrote:
> H. Peter Anvin wrote:
>> On this subject, what is the point of the 64 K "slop space", and if it
>> is necessary, why not just put it as a RESERVE_BRK() somewhere (*with* a
>>  significant comment as to its necessity) instead of putting it as a
>> hack in the linker script?
>>
> 
> 32bit already have that
> 
> +INIT_MAP_SIZE = (PAGE_TABLE_SIZE + ALLOCATOR_SLOP) * PAGE_SIZE_asm
> +RESERVE_BRK(pagetables, INIT_MAP_SIZE)
> 
> in head_32.S
> 
> so need to update vmlinux_32.lds.S
> 

What about 64 bits?  Also, do we really need the "allocator slop", or 
can we push that into the user location, which is where it really 
belongs?  What does use this?

	-hpa

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