dtrace discuss - Sep 2006 - how to monitor the changes to the "reference count"?

Hi gurus,

Is there a general way to monitor the changes to the "reference
count"?  One possible method is as in CONN_INC_REF()/CONN_DEC_REF(), see:
   
http://cvs.opensolaris.org/source/xref/on/usr/src/uts/common/inet/ipclassifier.h#295

which is just adding SDT probes before the refcnt changes.

I want to trace other reference counts, but I hate to add SDTs.    Is it
possible add this feature into "lockstat" provider?

Thanks,
-Alex
 
 
This message posted from opensolaris.org

On Wed, Sep 20, 2006 at 11:55:35PM -0700, Alex Peng
wrote:
> Is there a general way to monitor the changes to the "reference
count"?
> One possible method is as in CONN_INC_REF()/CONN_DEC_REF(), see:
> 
> I want to trace other reference counts, but I hate to add SDTs. Is it
> possible add this feature into "lockstat" provider?
Building this into lockstat wouldn''t be any less intrusive or any less
work
(it would probably be more work). Without using SDT probes, the only other
option is to use fbt probes, and that may or may not apply to the situation
you have in mind.

Adam

-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl

OK, only fbt probes is not enough.   What I want is to have a probe close to
that refcnt++ (or refcnt--).     So do you mean that SDT could be the most
suitable solution in this case?      Then I am fine with adding more SDT probes.
Anyway, since it''s mostly for private use, I can decide when to add
them, and when to remove them.   If I feel some probes would be benefic for
others, I will post them,  that''s the way to enhance DTrace, right?

Thanks,
-Alex
 
 
This message posted from opensolaris.org