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Date: Mon, 08 Dec 2008 21:59:07 +0100
From: Martin Mohring <martin.mohring@opensuse.org>
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Subject: Re: [Qemu-devel] [PATCH] Rewrite mmap_find_vma() to work fine on
	64-bit hosts with 32-bit targets
References: <1228303789-25653-1-git-send-email-kirill@shutemov.name>	<1228303789-25653-6-git-send-email-kirill@shutemov.name>	<1228303789-25653-7-git-send-email-kirill@shutemov.name>	<200812031234.18733.paul@codesourcery.com>	<20081203125057.GA29192@epbyminw8406h.minsk.epam.com>
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To: qemu-devel@nongnu.org
Cc: Paul Brook <paul@codesourcery.com>

Kirill A. Shutemov wrote:
> On Wed, Dec 03, 2008 at 02:50:57PM +0200, Kirill A. Shutemov wrote:
>   
>> On Wed, Dec 03, 2008 at 12:34:18PM +0000, Paul Brook wrote:
>>     
>>> On Wednesday 03 December 2008, Kirill A. Shutemov wrote:
>>>       
>>>> qemu's page table can be incomple if /proc/self/maps is unavailable or
>>>> host allocating a memory with mmap(), so we can't use it to find free
>>>> memory area.
>>>>         
>>> Do we really care? Do such systems exist?
>>>       
>> I use qemu-arm to build packages in restricted environment -- in hasher[1].
>> hasher mounts /proc only for packages that really need it for building
>> (java, for example).
>>
>> [1] http://en.altlinux.org/Hasher
>>     
>
> Paul, do you have any objection or not? I really want to see it into
> upstream.
>
>   
One question I have though... What happens, if a start up script (ini
script) run in qemu linux-user changes /proc/sys/vm/mmap_min_addr from 0
to say 65536? Can this ever work, without later memory allocs with
mmap() failing?

Martin