Re: [RFC Patch 1/2] kexec: show memory info in /proc/iomem

[Amerigo Wang]

Eric W. Biederman wrote:
> Amerigo Wang <amwang@xxxxxxxxxx> writes:
>
>   
> > This patch implements showing kexec memory area via /proc/iomem.
> > For example, with this patch we can see:
> >
> > # cat /proc/iomem
> > ...
> > 00100000-7ffeffff : System RAM
> >   01000000-012e1424 : Kernel code
> >   012e1425-015f1aff : Kernel data
> >   0166b000-01b4b88f : Kernel bss
> >   02000000-083fffff : Crash kernel
> >     02000000-028fffff : Used
> >     02900000-083fffff : Unused
> > ...
> >
> > So that user can know how much memory the kernel uses for crash kernel.
> >     
>
> Nacked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
>
> We can inspect the image we are going to load to get this information.
> In fact /sbin/kexec already inspects the image we are going to load
> to get this information.  Putting this in the kernel adds kernel
> complexity for no gain.
>   

/sbin/kexec is supported to know this, of course. But this is not for 
/sbin/kexec, this is for user (or other programs) to observe the memory 
information, so that he can know the memory he reserved is too much or not.

Without this, it is a little hard to use patch 2/2.

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