dtrace discuss - Oct 2005 - dtrace and printing cookies in the kernel

There are some cookie values in the kernel for which it would be nice to be able
to get a meaningful name about - for example zoneid''s.

I''d like to be able to convert a zoneid into a zone name for output
with dtrace scripts.

Is this possible?

If not, who should own this RFE?

and/or should it be part of a larger RFE to enable dtrace to print out
meaningful names for other cookies passed around inside the kernel?

I''m sure there are other magical cookie id''s that would be
useful to have a friendly string representation for printing out with dtrace :)
This message posted from opensolaris.org

Darren Reed wrote:
> There are some cookie values in the kernel for which it would be nice to be
able to get a meaningful name about - for example zoneid''s.
> 
> I''d like to be able to convert a zoneid into a zone name for
output with dtrace scripts.
> 
> Is this possible?
> 
> If not, who should own this RFE?
> 
> and/or should it be part of a larger RFE to enable dtrace to print out
meaningful names for other cookies passed around inside the kernel?
> 
> I''m sure there are other magical cookie id''s that would
be useful to have a friendly string representation for printing out with dtrace
:)
> This message posted from opensolaris.org
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
Interesting that you should mention that.

One of the things that we discussed with bmc while he was out was 
printing out stuff like signal names, errno names and various other things.

Such a suggestion may end up in his current wad as well if you ask him 
nicely ;)

alan.
-- 
Alan Hargreaves - http://blogs.sun.com/tpenta
Staff Engineer (Kernel/VOSJEC/Performance)
Product Technical Support (APAC)
Sun Microsystems

On Fri, Oct 28, 2005 at 12:04:41AM -0700, Darren Reed
wrote:
> There are some cookie values in the kernel for which it would be nice to be
able to get a meaningful name about - for example zoneid''s.
> 
> I''d like to be able to convert a zoneid into a zone name for
output
> with dtrace scripts.
Uh, there is the "zonename" variable:

# dtrace -n ''BEGIN{trace(zonename)}''
dtrace: description ''BEGIN'' matched 1 probe
CPU     ID                    FUNCTION:NAME
  0      1                           :BEGIN   global                           
^C

But for things like args[0]->pr_zoneid, there''s no good way.  File
an RFE (kernel/dtrace or library/libdtrace).

Cheers,
- jonathan

-- 
Jonathan Adams, Solaris Kernel Development