Re: [proc.txt] Fix /proc/pid/statm documentation

Martin J. Bligh
2004-08-06T21:21:26Z

--On Friday, August 06, 2004 14:38:54 -0400 Albert Cahalan <albert@users.sourceforge.net> wrote:

> On Fri, 2004-08-06 at 16:49, Martin J. Bligh wrote:
>
>> > As long as I can fall back to the old /proc files when truly
>> > radical kernel changes happen, exposure of kernel internals
>> > isn't a serious problem.
>> >
>> > If I had the DWARF2 data alone, /dev/mem might be enough.
>> > (sadly, "top" would require some major work before I'd trust it)
>>
>> We did that on PTX ... walking tasklists lockless is a bitch.
>
> It's fast. Lockless tasklist walking looks easy enough.
> Find the process, grab the data, then find the process
> again. If the process went away, discard the data.

Oh, I know it's fast ... and probably the right thing to do. just hard ;-)
Either that or we come up with some intermediate abstraction that's faster
than /proc.

> I guess I'd like to have a /dev/ram-only device, for protection
> against touching device memory (including AGP mem) by mistake.
> It's odd that there doesn't seem to be such a device already.
> Without this, I'd need to re-verify much more often.

I'll make you one if you need it, but it shouldn't be a problem,
I'd think as you're just following pointers, which should all be
valid ...

M.