On Mon, Sep 09, 2013 at 07:05:25AM -0700, David Ahern wrote: > Adding Jiri. > > On 9/9/13 5:59 AM, Mark Hills wrote: > >On Fri, 6 Sep 2013, Andi Kleen wrote: > > > >>Mark Hills <m...@pogo.org.uk> writes: > >> > >>>I have a pre-compiled .so library, which was given to me for profiling. > >>> > >>>gdb can see a complete call stack -- both the library and my own code, > >>>as expected. > >>> > >>>But in perf the callgraph for the library is not present. I'm using > >>>"perf record -g", and the callgraph for the other code is seen. > >>> > >>>In what cases could gdb see the stack, but perf cannot? > >> > >>No frame pointer. > >> > >>Recompile with -fno-omit-frame-pointer > >> > >>Or if you have a new enough perf, you can use -g dwarf to enable > >>dwarf backtracing, but it's very slow and also doesn't handle all > >>situations gdb handles. > > > >Thank you, much appreciated. > > > >A newer perf appears to need a newer kernel too, and it's not practical > >for me to break away from the RedHat kernel at the moment (currently on > >2.6.32-358.14.1.el6) > > Any updates to RHEL6 for dwarf callchains? >
unfortunately no news in RHEL6 for this one jirka -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
