[Bug tapsets/6525] need utrace task-finder-based pid->execname, pid->cwd-path-name tables

[wenji dot huang at oracle dot com]

------- Additional Comments From wenji dot huang at oracle dot com  2009-03-03 04:29 -------
(In reply to comment #6)
> > But it can't return the execname of most running processes like init, mingetty,
> > kjournald because the callback is never invoked.
> > Only works fine on my forked test process. My box is 2.6.27.9-159.fc10.i686.
> 
> The task_finder will never be able to return the execname or pathname of kernel
> threads, like 'init' or 'kjournald'.  The 'u' in 'utrace' stands for 'user' - it
> only works on user threads.  I'm unsure of why 'mingetty' couldn't be found.
> 
> > Did I miss something or misunderstand the mechanism?
> 
> Besides the above problem of returning the execname/pathname for kernel threads,
> there are other things that won't work well in the code you posted.  As
> currently written, the task_finder isn't designed to register new targets while
> running (since there is no locking provided) or to be started/stopped more than
> once.
> 
Thank you for letting me know this. Seems task_finder is not good candidate
for pid lookup functions. Maybe my patch in #4 is a choice.


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http://sourceware.org/bugzilla/show_bug.cgi?id=6525

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