Em Thu, Sep 04, 2014 at 03:11:31PM -0500, david lerner escreveu: > Has perf probe for userspace shared libraries been modified to use dwarf info? > The first commit to provide this useful functionality... > fb7345bbf7fad9 perf probe: Support basic dwarf-based operations on > uprobe events, > shows examples only with the executable perf, but not with a shared library. > With version 3.14 I'm able to set probes in application executable, > for example for the test application 'libunwind-test.out' I see the > usual args to main(): > root@qemu0:~# perf probe -x ./libunwind-test.out --vars main > Available variables at main > @<main+0> > char** a > int c > But I can't access the variables in a library that has embedded (not > split out) dwarf debug info... > root@qemu0:~# perf probe -x /usr/lib64/libunwind.so --vars unw_backtrace > Failed to find symbol at 0x33c38039cd > Failed to find variables at unw_backtrace (-2) > Error: Failed to show vars. (-2) > I've used gdb to confirm that perf found the correct function address > for unw_backtrace(), and that gdb knows the symbolic names of the > arguments. > Is using dwarf debuginfo with shared libraries for perf uprobes on the > to-do list? > Or is this capability incomplete in version 3.14 and I need to pick up > other patches?
Have to check this, but perhaps Masami has this working already? - Arnaldo -- 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
