Hi, If you can wait for 2.6.30, all this ptrace-related problems will go away.
On Sun, Jul 19, 2009 at 4:26 AM, Corey J Ashford<cjash...@us.ibm.com> wrote: > 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 > > ------------------------------------------------------------------------------ > 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 > > ------------------------------------------------------------------------------ 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
