linux-kernel - Re: [Patch BUGFIX] kcore: fix its wrong size on x86

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Date:	Tue, 16 Jun 2009 06:10:18 +0800
From:	TaoMa <tao.ma@...cle.com>
To:	ebiederm@...ssion.com
CC:	Amerigo Wang <xiyou.wangcong@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [Patch BUGFIX] kcore: fix its wrong size on x86_64

ebiederm@...ssion.com wrote:
> Tao Ma <tao.ma@...cle.com> writes:
>
>   
>> Hi Amerigo,
>>
>> The wrong number I mean is 131941393240064.
>>
>> So do you think
>> [root@...t3 ~]# ls -l /proc/kcore
>> -r-------- 1 root root 131941393240064 Jun 15 13:39 /proc/kcore
>>
>> is better than
>>
>> [taoma@...t2 ~]$ ll /proc/kcore
>> -r-------- 1 root root 281474974617600 Jun 15 15:20 /proc/kcore
>> ?
>>
>> I don't think so.
>>
>> Actually the right result should look like
>>
>> [root@...t8 ~]# ls -l /proc/kcore
>> -r-------- 1 root root 5301604352 Jun 15 13:35 /proc/kcore
>>
>> And with your patch I can't get this number.
>>     
>
> Actually that value is the bug.  It has absolutely nothing
> to do with the offsets that are valid within /proc/kcore.
>
> Why do you prefer the smaller number?
>   
Amerigo said in the previous e-mail that " the man page for/proc/kcore 
is wrong, its size can be more than the physical memory size, because it 
also contains memory area of vmalloc(), vsyscall etc..."

I have 4G memory, and 5301604352 is just a bit larger than 4G and looks 
sane. So I misunderstand that this number is right.

But if it is also a bug, I am willing to test any of the new patch. ;)

Regards,
Tao
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