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| author |   Jiri Olsa <jolsa@kernel.org> | 2014-04-17 19:39:10 +0200 |
|---|---|---|
| committer | Jiri Olsa <jolsa@kernel.org> | 2014-06-12 16:53:19 +0200 |
| commit | 0c4e774fad0202b91dea8d99c04e9bdf2c2c6647 (patch) | |
| tree | 9a94e5f06914e70d8093e43ea4f85f0843aaba1c /tools/perf/util/perf_regs.h | |
| parent | perf record: Fix to honor user freq/interval properly (diff) | |
| download | linux-dev-0c4e774fad0202b91dea8d99c04e9bdf2c2c6647.tar.xz linux-dev-0c4e774fad0202b91dea8d99c04e9bdf2c2c6647.zip | |
perf tools: Cache register accesses for unwind processing
Caching registers value into an array. Got about 4% speed up
of perf_reg_value function for report command processing
dwarf unwind stacks.
Output from report over 1.5 GB data with DWARF unwind stacks:
(TODO fix perf diff)
current code:
5.84% perf perf [.] perf_reg_value
change:
1.94% perf perf [.] perf_reg_value
And little bit of overall speed up:
(perf stat -r 5 -e '{cycles,instructions}:u' ...)
current code:
310,298,611,754 cycles ( +- 0.33% )
439,669,689,341 instructions ( +- 0.03% )
188.656753166 seconds time elapsed ( +- 0.82% )
change:
291,315,329,878 cycles ( +- 0.22% )
391,763,485,304 instructions ( +- 0.03% )
180.742249687 seconds time elapsed ( +- 0.64% )
Acked-by: Namhyung Kim <namhyung@kernel.org>
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>
Link: http://lkml.kernel.org/r/1401892622-30848-2-git-send-email-jolsa@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Diffstat (limited to 'tools/perf/util/perf_regs.h')
| -rw-r--r-- | tools/perf/util/perf_regs.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h index 79c78f74e0cf..980dbf76bc98 100644 --- a/tools/perf/util/perf_regs.h +++ b/tools/perf/util/perf_regs.h @@ -2,7 +2,8 @@ #define __PERF_REGS_H #include <linux/types.h> -#include "event.h" + +struct regs_dump; #ifdef HAVE_PERF_REGS_SUPPORT #include <perf_regs.h> @@ -11,6 +12,7 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id); #else #define PERF_REGS_MASK 0 +#define PERF_REGS_MAX 0 static inline const char *perf_reg_name(int id __maybe_unused) { |