On Fri, Oct 11, 2013 at 07:58:29AM +0200, Ingo Molnar wrote: > > * Namhyung Kim <namhy...@kernel.org> wrote: > > > Hello, > > > > This is a new version of callchain improvement patchset. Basically > > it's almost same as v4 but rebased on current acme/perf/core and some > > functions are renamed as Frederic requested. > > > > Now I'm hunting down a bug in 'perf report -s sym' which was found > > during the test, but I think it's not related to this change as it can > > be reproduced in earlier versions too. > > > > I put this series on 'perf/callchain-v5' branch in my tree > > > > git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git > > > > Any comments are welcome, thanks. > > One thing I noticed about call-graph profiling: > > comet:~/tip/tools/perf> ./perf record -g ~/hackbench 10 > callchain: Unknown -g option value: /home/mingo/hackbench > > I think a naked -g used to work just fine in the past. Even if such an > error is displayed the output is very unhelpful, it does does a full > perf-record options dump (unnecessary), the bit that is helpful is hidden > amongst many other options: > > -g, --call-graph <mode[,dump_size]> > do call-graph (stack chain/backtrace) recording: > [fp] dwarf > > and it took me two reads to see that I should specify 'fp'. The '[fp]' > indicates that fp is the default - but that does not appear to be working.
'-g' takes optional parameter, so having it in front of non option string is causing the error, you could use: ./perf record -g -- ~/hackbench 10 maybe we could display just only help string of the option we failed to process in this case 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/
