you can also look at proc/iomem -
--------------------------------------------------
From: "William Case" <billlinux@xxxxxxxxxx>
Sent: Sunday, April 27, 2008 2:52 PM
To: "Jesper Juhl" <jesper.juhl@xxxxxxxxx>
Cc: "Kernel Newbies" <kernelnewbies@xxxxxxxxxxxx>
Subject: Re: viewing memory ??
Hi Jesper;
On Sun, 2008-04-27 at 19:20 +0200, Jesper Juhl wrote:
2008/4/27 William Case <billlinux@xxxxxxxxxx>:
> Hi;
>
> I am not sure I am posing this question correctly, so please view it
> from the perspective of where I am trying to get to.
>
> I have recently taken up the "kernel" challenge.
>
> The text books I have all show a schematic of memory organization.
> First BIOS; Next kernel space; then user space; with various
> subdivisions within each space.
>
> Is there a program I can download, or by using sysfs, procfs a way,
> that
> lets me catch a snapshot of what my entire memory looks like --
> address
> by address grouping (block)-- with some type of labels for each
> grouping
> (block)? I am willing to build a diagram for myself, if I can be
> assured that some strategy will give me everything.
>
> Even if it is a lot of data, it is a, sort of, one time thing. More
> in
> the seeing-is-believing line of thought than anything else.
I'm not sure this is all you want/need, but perhaps it is :)
There is
cat /proc/meminfo
And also
cat /proc/vmstat
Then there's the slabinfo tool which can also show a lot of details:
juhl@dragon:~/kernel/linux-2.6$ gcc -o slabinfo
Documentation/vm/slabinfo.c
juhl@dragon:~/kernel/linux-2.6$ ./slabinfo -h
slabinfo 5/7/2007. (c) 2007 sgi. clameter@xxxxxxx
slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]
-a|--aliases Show aliases
-A|--activity Most active slabs first
-d<options>|--debug=<options> Set/Clear Debug options
-D|--display-active Switch line format to activity
-e|--empty Show empty slabs
-f|--first-alias Show first alias
-h|--help Show usage information
-i|--inverted Inverted list
-l|--slabs Show slabs
-n|--numa Show NUMA information
-o|--ops Show kmem_cache_ops
-s|--shrink Shrink slabs
-r|--report Detailed report on single slabs
-S|--Size Sort by size
-t|--tracking Show alloc/free information
-T|--Totals Show summary information
-v|--validate Validate slabs
-z|--zero Include empty slabs
-1|--1ref Single reference
Valid debug options (FZPUT may be combined)
a / A Switch on all debug options (=FZUP)
- Switch off all debug options
f / F Sanity Checks (SLAB_DEBUG_FREE)
z / Z Redzoning
p / P Poisoning
u / U Tracking
t / T Tracing
Lots of details can also be found in various files in /sys/kernel/slab/
Hope that helps :)
I think it will. It will take me a few days to climb into it, but I
suspect everything I want to learn and see will be there. I had used
cat /proc/meminfo but not cat /proc/vmstat nor /proc/slabinfo.
--
Regards Bill
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