Hi Jean, On Wed, 24 Sep 2014 15:45:57 +0200, Jean Pihet wrote: > Hi! > > Here are the test results on ARMv7 for the 2 patches. The speedup is > about x2.1 for identical unwinding output data. > > 'perf record --call-graph dwarf -- stress --cpu 2 --io 2 --vm 2 > --timeout 10s' generates a 365 MB perf.data file. > > time perf.orig report --sort symbol --call-graph --stdio 2&>1 > /dev/null > average on 3 runs > real 36.736 > user 14.79 > sys 21.91 > > time perf.libunwind.speedup report --sort symbol --call-graph --stdio > 2&>1 > /dev/null > average on 3 runs > real 17.41 x2.11 > user 6.42 x2.3 > sys 10.97 x2 > > So the patches definitely speedup the unwinding. > FWIW: Acked-by: Jean Pihet <jean.pi...@linaro.org>
Thanks for your test! Btw, have you checked the difference of the output before and after the caching? > > For info unwinding using libdw is about 5x faster: > time perf.libdw.speedup report --sort symbol --call-graph --stdio 2&>1 >> /dev/null > real 0m3.484s > user 0m2.360s > sys 0m1.070s Wow, it's pretty nice. I'll take a look at the libdw unwinding later. Thanks, Namhyung -- 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/
