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

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Date:	Fri, 23 May 2014 10:13:57 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	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>,
	Jean Pihet <jean.pihet@...aro.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

ping ;-)

thanks,
jirka

On Thu, May 15, 2014 at 07:23:21PM +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 ;-).
> 
> v2 changes:
>   - adding limit for open dso objects with sort of LRU
>     mechanism to pick up and close dso objects if we
>     are over the limit
>   - file mmaping changes are omitted, because I couldn't prove
>     the improvement exactly, will resubmit later
>   - added dso close logic in case of no memory
>   - added tests
> 
> On 10GB perf data file with dwarf unwind data I've got
> around 30% speed up.
> 
> Also reachable in here:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   perf/core_unwind_speedup
> 
> thanks,
> jirka
> 
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> 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: Jean Pihet <jean.pihet@...aro.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> Jiri Olsa (14):
>       perf tools: Cache register accesses for unwind processing
>       perf tools: Separate dso data related variables
>       perf tools: Add data_fd into dso object
>       perf tools: Add global list of opened dso objects
>       perf tools: Add global count of opened dso objects
>       perf tools: Cache dso data file descriptor
>       perf tools: Add file size check and factor dso__data_read_offset
>       perf tools: Allow to close dso fd in case of open failure
>       perf tools: Add dso__data_* interface descriptons
>       perf tests: Spawn child for each test
>       perf tests: Allow reuse of test_file function
>       perf tests: Add test interface for dso data fd limit
>       perf tests: Add test for caching dso file descriptors
>       perf tests: Add test for closing dso objects on EMFILE error
> 
>  tools/perf/tests/builtin-test.c    |  42 ++++++++++++++-
>  tools/perf/tests/dso-data.c        | 256 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
>  tools/perf/tests/tests.h           |   2 +
>  tools/perf/util/dso.c              | 274 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
>  tools/perf/util/dso.h              |  56 +++++++++++++++++++-
>  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 |   4 +-
>  9 files changed, 617 insertions(+), 36 deletions(-)
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