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

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Date:	Mon, 15 Jun 2009 16:34:27 +0800
From:	Tao Ma <tao.ma@...cle.com>
To:	Amerigo Wang <xiyou.wangcong@...il.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.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

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.

Regards,
Tao

Amerigo Wang wrote:
> On Mon, Jun 15, 2009 at 01:59:08PM +0800, Tao Ma wrote:
>> Hi Amerigo,
>> 	Just patched my kernel and tested.
>> 	The bad news is that although the number is changed, but it isn't right  
>> either.
> 
> Thanks for testing.
> 
> What do you mean by saying it isn't right? You think it is wrong only because
> it is more than phy mem size?
> 
> Again, the document of /proc/kcore is wrong, it _can_ be more than phy mem size.
> 
> Regards.
> 
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