On Thu, Dec 03, 2015 at 12:33:40AM +0900, Namhyung Kim wrote: > Backtrace is a crucial info for debugging. And upcoming refcnt > tracking facility also wants to use it. > > So instead of relying on glibc's backtrace_symbols[_fd] which misses > some (static) functions , use our own symbol searching mechanism. To > do that, add perf_thread global variable to keep its maps and symbols. > > The backtrace output from TUI is changed like below. (I made a key > action to generate a segfault): > > Before: > perf: Segmentation fault > -------- backtrace -------- > perf[0x544a8b] > /usr/lib/libc.so.6(+0x33680)[0x7fc46420b680] > perf[0x54041b] > perf(perf_evlist__tui_browse_hists+0x91)[0x5432e1] > perf(cmd_report+0x1d20)[0x43cb10] > perf[0x487073] > perf(main+0x62f)[0x42cb1f] > /usr/lib/libc.so.6(__libc_start_main+0xf0)[0x7fc4641f8610] > perf(_start+0x29)[0x42cc39] > > After: > perf: Segmentation fault > -------- backtrace -------- > perf_evsel__hists_browse(+0x43b) in perf [0x54066b] > perf_evlist__tui_browse_hists(+0x91) in perf [0x543531] > cmd_report(+0x1d20) in perf [0x43cb50] > run_builtin(+0x53) in perf [0x4870b3] > main(+0x634) in perf [0x42cb54] > __libc_start_main(+0xf0) in libc-2.22.so [0x7fea3577c610] > _start(+0x29) in perf [0x42cc79] > > Cc: Frederic Weisbecker <fweis...@gmail.com> > Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com> > Signed-off-by: Namhyung Kim <namhy...@kernel.org> > --- > v3) check return value of create_perf_thread()
Acked-by: Jiri Olsa <jo...@kernel.org> thanks, jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
