Re: [PATCH 0/3] perf tools: Speedup DWARF unwind

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxxxxx> wrote:

> 
> * Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
> 
> > hi,
> > trying to speedup DWARF unwind report code by factoring
> > related code:
> >   - caching sample's registers access
> >   - keep dso data file descriptor open for the
> >     life of the dso object
> >   - replace dso cache code by mapping dso data file
> >     directly for the life of the dso object
> > 
> > The speedup is mainly for libunwind unwind. The libdw will benefit
> > mainly from cached registers access, because it handles dso data
> > accesses by itself.. and anyway it's still faster ;-).
> 
> Just curious: do you have any numbers about how much faster it got in 
> practice?

Oh, the numbers are all in the changelogs, never mind!

So in your test workload it went from 54.6 seconds to 36.7, a 48% 
speedup :-)

Thanks,

	Ingo
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