dtrace discuss - Sep 2005 - Problems with pid provider and long mangled probe names

Hi,

I''m currently evaluating to use DTrace to find some performance 
bottlenecks in StarOffice/OpenOffice on Solaris.
I currently use the pid provider but I found the following problem:

dtrace: failed to compile script slidesorter.d: line 55: invalid probe 
description > 
"pid$1::__1cCsdLslidesorterFcacheOQdDueueProcessor4n0CTGenericRequestQdDueue4n0BEviewbBPageObjectViewObjectContact___n0E_n0CLBitmapCache_n0CVPreviewBitmapFactory2__OProcessRequest6M_v_:entry":
File name too long

Obviously the mangled name

__1cCsdLslidesorterFcacheOQdDueueProcessor4n0CTGenericRequestQdDueue4n0BEviewbBPageObjectViewObjectContact___n0E_n0CLBitmapCache_n0CVPreviewBitmapFactory2__OProcessRequest6M_v_

can not be processed as a probe by DTrace. Is there a way to work around 
this limit? Is it possible to change this limit?

Regards,
Christian

Hi Christian,

One way to work around it might be to use a wild-card character, but since
I suspect you''re bumping into a limitation of DTrace rather than the
pid
privder I doubt that will help. This isn''t going to be pretty, but
it''s
possible to use the pid provider to trace an explicit address; I suggest
you use mdb(1) (or whatever) to find the address of that function and then
use the pid provider on that address:

# mdb -p 1359
Loading modules: [ ld.so.1 libc.so.1 ]
> execute=K
                8072ad4
>
# dtrace -n pid1359::-:8072ad4
dtrace: description ''pid1368::-:8072ad4'' matched 1 probe

Obviously this isn''t ideal, but it is a work around that will address
your
problem. Tracing addresses can also be used when dealing with stripped
binaries.

I hope that helps. Sorry about the problem. We''ve been discussing on
and
off how to address the issue of very very long symbol names -- it looks
like we need to actually conclude that discussion.

Adam

On Wed, Sep 07, 2005 at 04:34:14PM +0200, Christian Lippka
wrote:
> Hi,
> 
> I''m currently evaluating to use DTrace to find some performance 
> bottlenecks in StarOffice/OpenOffice on Solaris.
> I currently use the pid provider but I found the following problem:
> 
> dtrace: failed to compile script slidesorter.d: line 55: invalid probe 
> description > 
>
"pid$1::__1cCsdLslidesorterFcacheOQdDueueProcessor4n0CTGenericRequestQdDueue4n0BEviewbBPageObjectViewObjectContact___n0E_n0CLBitmapCache_n0CVPreviewBitmapFactory2__OProcessRequest6M_v_:entry":
> File name too long
> 
> Obviously the mangled name
> 
>
__1cCsdLslidesorterFcacheOQdDueueProcessor4n0CTGenericRequestQdDueue4n0BEviewbBPageObjectViewObjectContact___n0E_n0CLBitmapCache_n0CVPreviewBitmapFactory2__OProcessRequest6M_v_
> 
> can not be processed as a probe by DTrace. Is there a way to work around 
> this limit? Is it possible to change this limit?
> 
> Regards,
> Christian
> 
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl