Messages in this thread | | | From | Jiri Olsa <> | Subject | [PATCHv2 00/14] perf tools: Speedup DWARF unwind | Date | Thu, 15 May 2014 19:23:21 +0200 |
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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@kernel.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Jiri Olsa <jolsa@kernel.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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