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author | Ian Rogers <irogers@google.com> | 2020-04-02 18:43:53 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-04-16 18:19:12 +0300 |
commit | 2a4b51666af8bf0b67ccc2e53120bad27351917c (patch) | |
tree | 80b83a1a3bd37d5d10972be4f9d322fbc2cfaef6 /tools/perf/builtin-bench.c | |
parent | 1a2725f3ee5571cf07966f467b73a9941bcbacb8 (diff) | |
download | linux-2a4b51666af8bf0b67ccc2e53120bad27351917c.tar.xz |
perf bench: Add event synthesis benchmark
Event synthesis may occur at the start or end (tail) of a perf command.
In system-wide mode it can scan every process in /proc, which may add
seconds of latency before event recording. Add a new benchmark that
times how long event synthesis takes with and without data synthesis.
An example execution looks like:
$ perf bench internals synthesize
# Running 'internals/synthesize' benchmark:
Average synthesis took: 168.253800 usec
Average data synthesis took: 208.104700 usec
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrey Zhizhikin <andrey.z@gmail.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20200402154357.107873-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-bench.c')
-rw-r--r-- | tools/perf/builtin-bench.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c index c06fe21c8613..11c79a8d85d6 100644 --- a/tools/perf/builtin-bench.c +++ b/tools/perf/builtin-bench.c @@ -76,6 +76,11 @@ static struct bench epoll_benchmarks[] = { }; #endif // HAVE_EVENTFD +static struct bench internals_benchmarks[] = { + { "synthesize", "Benchmark perf event synthesis", bench_synthesize }, + { NULL, NULL, NULL } +}; + struct collection { const char *name; const char *summary; @@ -92,6 +97,7 @@ static struct collection collections[] = { #ifdef HAVE_EVENTFD {"epoll", "Epoll stressing benchmarks", epoll_benchmarks }, #endif + { "internals", "Perf-internals benchmarks", internals_benchmarks }, { "all", "All benchmarks", NULL }, { NULL, NULL, NULL } }; |