From b6f0629a94f7ed6089560be7f0561be19f934fc4 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Mon, 16 Jun 2014 11:14:19 -0700 Subject: [PATCH] perf bench: Add --repeat option There are a number of benchmarks that do single runs and as a result does not really help users gain a general idea of how the workload performs. So the user must either manually do multiple runs or just use single bogus results. This option will enable users to specify the amount of runs (arbitrarily defaulted to 10, to use the existing benchmarks default) through the '--repeat' option. Add it to perf-bench instead of implementing it always in each specific benchmark. Signed-off-by: Davidlohr Bueso Cc: Aswin Chandramouleeswaran Cc: Hitoshi Mitake Cc: Jiri Olsa Link: http://lkml.kernel.org/r/1402942467-10671-2-git-send-email-davidlohr@hp.com [ Kept the existing default of 10, changing it to something else should be done on separate patch ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-bench.txt | 4 ++++ tools/perf/bench/bench.h | 1 + tools/perf/builtin-bench.c | 7 +++++++ 3 files changed, 12 insertions(+) diff --git a/tools/perf/Documentation/perf-bench.txt b/tools/perf/Documentation/perf-bench.txt index 4464ad770d51..f6480cbf309b 100644 --- a/tools/perf/Documentation/perf-bench.txt +++ b/tools/perf/Documentation/perf-bench.txt @@ -16,6 +16,10 @@ This 'perf bench' command is a general framework for benchmark suites. COMMON OPTIONS -------------- +-r:: +--repeat=:: +Specify amount of times to repeat the run (default 10). + -f:: --format=:: Specify format style. diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h index eba46709b279..3c4dd44d45cb 100644 --- a/tools/perf/bench/bench.h +++ b/tools/perf/bench/bench.h @@ -43,5 +43,6 @@ extern int bench_futex_requeue(int argc, const char **argv, const char *prefix); #define BENCH_FORMAT_UNKNOWN -1 extern int bench_format; +extern unsigned int bench_repeat; #endif diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c index 1e6e77710545..b9a56fa83330 100644 --- a/tools/perf/builtin-bench.c +++ b/tools/perf/builtin-bench.c @@ -104,9 +104,11 @@ static const char *bench_format_str; /* Output/formatting style, exported to benchmark modules: */ int bench_format = BENCH_FORMAT_DEFAULT; +unsigned int bench_repeat = 10; /* default number of times to repeat the run */ static const struct option bench_options[] = { OPT_STRING('f', "format", &bench_format_str, "default", "Specify format style"), + OPT_UINTEGER('r', "repeat", &bench_repeat, "Specify amount of times to repeat the run"), OPT_END() }; @@ -226,6 +228,11 @@ int cmd_bench(int argc, const char **argv, const char *prefix __maybe_unused) goto end; } + if (bench_repeat == 0) { + printf("Invalid repeat option: Must specify a positive value\n"); + goto end; + } + if (argc < 1) { print_usage(); goto end; -- 2.34.1