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

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Date:	Fri, 25 Apr 2014 15:08:04 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	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>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jean Pihet <jean.pihet@...aro.org>
Subject: Re: [PATCH 0/3] perf tools: Speedup DWARF unwind

ping, any feedback?

thanks,
jirka


On Thu, Apr 17, 2014 at 07:39:09PM +0200, Jiri Olsa 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 ;-).
> 
> Also reachable in here:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   perf/core_unwind_speedup
> 
> thanks,
> jirka
> 
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Jean Pihet <jean.pihet@...aro.org>
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> ---
> Jiri Olsa (3):
>       perf tools: Cache register accesses for unwind processing
>       perf tools: Cache dso data file descriptor
>       perf tools: Replace dso data cache with mapped data
> 
>  tools/perf/tests/dso-data.c        |   7 ++++
>  tools/perf/util/dso.c              | 200 +++++++++++++++++++++++++++---------------------------------------------------------------------
>  tools/perf/util/dso.h              |  14 ++-----
>  tools/perf/util/event.h            |   5 +++
>  tools/perf/util/perf_regs.c        |  10 ++++-
>  tools/perf/util/perf_regs.h        |   4 +-
>  tools/perf/util/unwind-libunwind.c |   2 -
>  7 files changed, 83 insertions(+), 159 deletions(-)
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