Re: [PATCH] /proc/cpumem
From: Itsuro Oda
Date: Wed Feb 16 2005 - 19:44:22 EST
Hi Eric,
> 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.
Hmm, restricting System RAM only may be too pessimistic.
(One of motivations of this work is for using /dev/mem safely.
"dd if=/dev/mem of=xxx" causes panic on my amd64(8GB mem) machine
since reading from address around 0xfe000000 causes a machine
check. hmm, this area is marked as "reserved". not ACPI area.
ACPI area can be read.)
Ok, I will add a type field.
> The other direction something like this can go is to dump
> the data structures in linux/mmzone.h
Do you mean defining a data structure in linux/mmzone.h ?
I used to think a particular struct is not necessary for this work,
but now I think it is better to define a struct for this.
Let me consider.
> 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.
I am looking forward this :-)
And, you mentioned a couple of weeks ago:
> Anyway one thing I want to do is actually drop the apic shutdown
> code altogether in this code path. I threw it in there to
> ease the transition from the old code base to the new, but
> if that code is causing issues.... So this is probably a good time
> to start testing that.
How about this ?
Thanks.
--
Itsuro ODA <oda@xxxxxxxxxxxxx>
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