Hi, Yes the line 136 prints the application thread id correctly. I also don't know what could be the problem. May be ptrace does not allow threadID as parameter. When will the version 2.6.30 be available?
Thanks Tanima. ________________________________ From: Corey J Ashford <cjash...@us.ibm.com> To: Tanima Dey <dey_tr...@yahoo.com> Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>; Perfmon <perfmon2-devel@lists.sourceforge.net> Sent: Tuesday, July 21, 2009 12:12:15 AM Subject: Re: [perfmon2] About per-thread monitoring Hi Tanima, Does the " fprintf(stdout, "apptid %d gettid(): %d \n",apptid, gettid());" at line 136 print correct looking task ids? If the apptid is zero, maybe you need to add a "volatile" keyword added to the declaration of apptid, since it is written in one thread, and accessed in another. If the apptid is ok looking, and you're getting operation not permitted, that's seems very odd. Ptrace ought to be able to attach to threads you have created. Otherwise, the code looks ok to me. Maybe Stephane has some ideas. Regards, - Corey Corey Ashford Software Engineer IBM Linux Technology Center, Linux Toolchain Beaverton, OR 503-578-3507 cjash...@us.ibm.com Tanima Dey <dey_tr...@yahoo.com> wrote on 07/20/2009 12:37:55 PM: > Tanima Dey <dey_tr...@yahoo.com> > 07/20/2009 12:37 PM > > To > > Corey J Ashford/Beaverton/i...@ibmus > > cc > > Corey Ashford <cjash...@linux.vnet.ibm.com>, Perfmon <perfmon2- > de...@lists.sourceforge.net> > > Subject > > Re: [perfmon2] About per-thread monitoring > > Hi, > I am attaching the code. > Thank you very much. > Tanima. > > From: Corey J Ashford <cjash...@us.ibm.com> > To: Tanima Dey <dey_tr...@yahoo.com> > Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>; Perfmon <perfmon2- > de...@lists.sourceforge.net> > Sent: Saturday, July 18, 2009 10:26:11 PM > Subject: Re: [perfmon2] About per-thread monitoring > Can you post the code where you are doing the fork/exec of the app, > and following ptrace call? Maybe we can spot the problem easier that > way, because I'm a little confused about the terminology > "appThread". If appThread is a pthread id, that would be the reason > that ptrace is not working... it takes task ids, rather than pthread ids. > > - Corey > > Tanima Dey <dey_tr...@yahoo.com> wrote on 07/18/2009 03:55:02 PM: > > > Tanima Dey <dey_tr...@yahoo.com> > > 07/18/2009 03:55 PM > > > > To > > > > Corey Ashford <cjash...@linux.vnet.ibm.com> > > > > cc > > > > Perfmon <perfmon2-devel@lists.sourceforge.net> > > > > Subject > > > > Re: [perfmon2] About per-thread monitoring > > > > Hi, > > Yes, I have studied that example, and wrote similar code, but for > > the appThread. But it shows me the same error message for ptrace() > > while attaching the task. I have given the appThread ID instead of > > the process ID, and it shows the message: > > > > "cannot attach to threadID, operation is not permitted" > > > > Can you help? > > Thanks > > Tanima. > > > > From: Corey Ashford <cjash...@linux.vnet.ibm.com> > > To: Tanima Dey <dey_tr...@yahoo.com> > > Cc: Perfmon <perfmon2-devel@lists.sourceforge.net> > > Sent: Friday, July 17, 2009 6:20:09 PM > > Subject: Re: [perfmon2] About per-thread monitoring > > > > On 07/16/2009 04:33 PM, Tanima Dey wrote: > > > > > > Hi, > > > > > > Thanks for the reply. > > > > > > It is mentioned in the manual that the thread to which the context is > > > attached is the monitored thread, in my case then it is the application > > > thread to which the context should be loaded, right? If it is so, I am > > > initializing and loading the context in the appThread, and trying to > > > read the counters value in the monitor thread. So I have used ptrace() > > > to stop the appThread in the monitor thread and trying to read the > > > counters, but it is showing the error message: Cannot attach: Operation > > > not permitted. Also I tried to read by saving the file descriptor > > > variable, it is also not working. > > > > > > Must the per-thread monitoring always be self-monitoring? Otherwise, I > > > think it will always be the case that the monitoring thread wont have > > > any access to PMU state initialized by the appThread. > > > > > > What wrong I am doing here?Do you have any examples for perthread > > > monitoring using threads? > > > > > > > You can monitor from the same thread or from another thread, or from > > another thread in a different process. > > > > Have you looked at libpfm/examples_v2.x/task_attach.c ? > > > > It is an example of monitoring events in another task (i.e. process or > > thread). > > > > - Corey > > > ------------------------------------------------------------------------------ > > Enter the BlackBerry Developer Challenge > > This is your chance to win up to $100,000 in prizes! For a limited time, > > vendors submitting new applications to BlackBerry App World(TM) will have > > the opportunity to enter the BlackBerry Developer Challenge. See > full prize > > details at: http://p.sf.net/sfu/Challenge > > _______________________________________________ > > perfmon2-devel mailing list > > perfmon2-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > [attachment "pstart7_8.c" deleted by Corey J Ashford/Beaverton/IBM]
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