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Subject: Re: libc/1427: gprof does not profile threads <synopsis of the problem
To: dkegel@ixiacom.com (Dan Kegel)
Date: Thu, 14 Mar 2002 01:28:40 +0000 (GMT)
Cc: drepper@redhat.com (Ulrich Drepper), darkeye@tyrell.hu, libc-gnats@gnu.org,
        gnats-admin@cygnus.com, sam@zoy.org,
        Xavier.Leroy@inria.fr (Xavier Leroy), linux-kernel@vger.kernel.org,
        babt@us.ibm.com
In-Reply-To: <3C8FEC76.F1411739@ixiacom.com> from "Dan Kegel" at Mar 13, 2002 04:19:02 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Here are a few alternate ideas off the top of my head:
> 
> * Rip out Linuxthreads, replace it with NGPT, and
> start fixing from there?  (Or does NGPT already fix this?)
> 
> * Rewrite Linux's setitimer(ITIMER_PROF,...) to set up an 
> interval timer for all threads of the thread group.
> 
> * Implement the profil() system call from Solaris
> ( http://ua1vm.ua.edu/cgi-bin/man-cgi?profil+2 )
> 
> What's your favorite idea for getting profiling of
> multithreaded programs working on Linux?

Kernel support is not needed  for this, do it in user space. Or prove it
has to be in kernel space
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