Re: [PATCH] /proc/cpumem

[Eric W. Biederman]

Itsuro Oda <oda@xxxxxxxxxxxxx> writes:

> Hi, Eric and all
> 
> Attached is an implementation of /proc/cpumem.
> /proc/cpumem shows the valid physical memory ranges.

Interesting.  My imagination when I proposed this
was something based on struct resource that works
like /proc/iomem on x86 but can be meaningfully
be used on systems with where ram lives in a separate
address space from io device memory.

> example: amd64 8GB Mem
> # cat /proc/cpumem
> 0000000000000000 000000000009b800
> 0000000000100000 00000000fbe70000
> 0000000100000000 0000000100000000
> #
> start address and size. hex digit.

The lack of a type field looses a fair amount of functionality compared
to /proc/iomem.  In particular you can't see where the ACPI data is.

The other direction something like this can go is to dump 
the data structures in linux/mmzone.h 
 
> Any comments, recomendations and suggestions are welcom.
> 
> BTW, does not kexec/kdump run on 2.6.11-rc3-mm2 ?
> How do I get and examine the latest kexec/kdump ?

I'm not quite certain what is happening.

I have been playing with kexec user space a little bit and a new 
development release is at:
http://www.xmission.com/~ebiederm/files/kexec/kexec-tools-1.101.tar.gz

I have written a first pass at a user space core dump generator,
using /dev/mem.  /sbin/kexec still needs some work to prepare
the ELF headers before a crash.

Eric
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