Hi, > You certainly don't need to modify the code of the child processes. > In the handler you can read the counter of the child processes. But > for the read to succeed, you need to stop the child. This can currently > be accomplished using ptrace and in particular PTRACE_ATTACH. > So you issue this call, wait (WUNTRACED) until this is effective, then you > call pfm_read_pmds(). When you are done, simply PTRACE_DETACH > the child. >
Thanks. I guess the pfmon source code for the --follow-all option is a good example. The problem is that in my case I cannot stop the child with ptrace() because the handler-thread forks in a hook-method that is not implemented by me. So I have no access to the child. Another option that I though of is to attach to the *thread* after it is created and then implement pfmon's --follow-all option. But I guess attach() does not work for threads, right? Cheers, Andrej ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
