Hi, On 26 September 2014 07:50, Namhyung Kim <namhy...@kernel.org> wrote: > 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? Yes the output is identical (as stated here above).
> >> >> 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 Thanks for the patches! Jean -- 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/
