Re: /proc/kcore has a unreasonable size(281474974617600) in x86_64 2.6.30-rc8.

[Tao Ma]

AmÃrico Wang wrote:
> On Mon, Jun 8, 2009 at 2:02 PM, Tao Ma<tao.ma@xxxxxxxxxx> wrote:
> > Amerigo Wang wrote:
> > > On Sat, Jun 06, 2009 at 03:21:23PM -0700, Yinghai Lu wrote:
> > > > Tao Ma wrote:
> > > > > Yinghai Lu wrote:
> > > > > > Tao Ma wrote:
> > > > > > > Amerigo Wang wrote:
> > > > > > > > On Fri, Jun 05, 2009 at 05:30:49PM +0800, Tao Ma wrote:
> > > > > > > > > > Please send the boot logs: dmesg -s 1000000 > foo
> > > > > > > > > attached.
> > > > > > > > > #######high memory 18446612137615818752, size_t 18446612137615818752
> > > > > > > > > #######kcore size 5301604352, PAGE_OFFSET 0, PAGE_SIZE 4096
> > > > > > > > These two lines must be added by yourself...
> > > > > > > >
> > > > > > > > What?!
> > > > > > > > How can PAGE_OFFSET be 0??
> > > > > > > > Can you show us these two printk() you just added?
> > > > > > > >
> > > > > > > > And, the size of kcore is not the crazy number in the subject...
> > > > > > > > This one is much saner..
> > > > > > > Sorry, I used the wrong printk. the correct one is:
> > > > > > > #######high memory 18446612137615818752, size_t 18446612137615818752
> > > > > > > #######kcore size 5301604352, PAGE_OFFSET 18446612132314218496,
> > > > > > > PAGE_SIZE 4096
> > > > > > %lx should be used.
> > > > > >
> > > > > > also you compiler doesn't like
> > > > > >
> > > > > > high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
> > > > > >
> > > > > > in setup.c?
> > > > > Sorry fo my poor English, bug what do you mean?
> > > > >
> > > > > I just printk in the setup.c and the result is
> > > > >
> > > > > @@@@high_momory ffff88013c000000
> > > > so that value print out is right.
> > > Yeah.
> > >
> > > Tao, can you reproduce the number mentioned in the subject??
> > Sorry for the delay.
> >
> > But the result is the same
>
> Yes?
> Your printk() shows kcore size is: 5301604352, and in your subject it is
> 281474974617600...
>
> Or they happened in the same time?
yes. the same box and the same linux version.
A bit strange.

[taoma@ocfs2-test2 ~]$ dmesg|grep "high memory"
high memory ffff88013c000000, size 5301604352
[taoma@ocfs2-test2 ~]$ ll /proc/kcore
-r-------- 1 root root 281474974617600 Jun  8 15:20 /proc/kcore


Regards,
Tao
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