linux-kernel - Re: [PATCHv2 00/14] perf tools: Speedup DWARF unwind

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Message-ID: <20140526173646.GC2763@krava.brq.redhat.com>
Date:	Mon, 26 May 2014 19:36:46 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jean Pihet <jean.pihet@...aro.org>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCHv2 00/14] perf tools: Speedup DWARF unwind

On Fri, May 23, 2014 at 03:26:27PM +0200, Jean Pihet wrote:
> Jiri,
> 
> 
> On 23 May 2014 10:13, Jiri Olsa <jolsa@...hat.com> wrote:
> > ping ;-)
> This looks a ping to yourself ;-)

:-)

> 
> Here are the results on ARMv7:
> - libunwind: between -29% in execution time for light load (i.e. using
> not-so-deep backtraces from the stress app.) and -49% for deep
> backtrace (the 'stress_bt' app.),
> - libdw: no significant improvement (0-2% improvement).

nice, thanks for testing!

> 
> Cf. https://wiki.linaro.org/LEG/Engineering/TOOLS/perf-callstack-unwinding#Speed_improvement
> for more details.
> 
> FWIW:
> Acked-by: Jean Pihet <jean.pihet@...aro.org>

thanks,
jirka
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