Re: [PATCH 1/5] perf bench uprobe: Add benchmark to test uprobe overhead
From: Google
Date: Fri Jul 21 2023 - 10:46:21 EST
On Wed, 19 Jul 2023 17:49:06 -0300
Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
> From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
>
> This just adds the initial "workload", a call to libc's usleep(1000us)
> function:
>
> $ perf stat --null perf bench uprobe all
> # Running uprobe/baseline benchmark...
> # Executed 1000 usleep(1000) calls
> Total time: 1053533 usecs
>
> 1053.533 usecs/op
>
> Performance counter stats for 'perf bench uprobe all':
>
> 1.061042896 seconds time elapsed
>
> 0.001079000 seconds user
> 0.006499000 seconds sys
>
> $
>
> More entries will be added using a BPF skel to add various uprobes to
> the usleep() function.
Looks good to me.
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Thanks,
>
> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Cc: Andre Fredette <anfredet@xxxxxxxxxx>
> Cc: Clark Williams <williams@xxxxxxxxxx>
> Cc: Dave Tucker <datucker@xxxxxxxxxx>
> Cc: Derek Barbosa <debarbos@xxxxxxxxxx>
> Cc: Ian Rogers <irogers@xxxxxxxxxx>
> Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> ---
> tools/perf/Documentation/perf-bench.txt | 3 +
> tools/perf/bench/Build | 1 +
> tools/perf/bench/bench.h | 1 +
> tools/perf/bench/uprobe.c | 80 +++++++++++++++++++++++++
> tools/perf/builtin-bench.c | 6 ++
> 5 files changed, 91 insertions(+)
> create mode 100644 tools/perf/bench/uprobe.c
>
> diff --git a/tools/perf/Documentation/perf-bench.txt b/tools/perf/Documentation/perf-bench.txt
> index f04f0eaded985fc8..ca5789625cd2b8e5 100644
> --- a/tools/perf/Documentation/perf-bench.txt
> +++ b/tools/perf/Documentation/perf-bench.txt
> @@ -67,6 +67,9 @@ SUBSYSTEM
> 'internals'::
> Benchmark internal perf functionality.
>
> +'uprobe'::
> + Benchmark overhead of uprobe + BPF.
> +
> 'all'::
> All benchmark subsystems.
>
> diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build
> index 0f158dc8139bbd0d..47412d47dccfeff2 100644
> --- a/tools/perf/bench/Build
> +++ b/tools/perf/bench/Build
> @@ -16,6 +16,7 @@ perf-y += inject-buildid.o
> perf-y += evlist-open-close.o
> perf-y += breakpoint.o
> perf-y += pmu-scan.o
> +perf-y += uprobe.o
>
> perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o
> perf-$(CONFIG_X86_64) += mem-memset-x86-64-asm.o
> diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h
> index 0d2b65976212333a..201311f75c964df2 100644
> --- a/tools/perf/bench/bench.h
> +++ b/tools/perf/bench/bench.h
> @@ -42,6 +42,7 @@ int bench_inject_build_id(int argc, const char **argv);
> int bench_evlist_open_close(int argc, const char **argv);
> int bench_breakpoint_thread(int argc, const char **argv);
> int bench_breakpoint_enable(int argc, const char **argv);
> +int bench_uprobe_baseline(int argc, const char **argv);
> int bench_pmu_scan(int argc, const char **argv);
>
> #define BENCH_FORMAT_DEFAULT_STR "default"
> diff --git a/tools/perf/bench/uprobe.c b/tools/perf/bench/uprobe.c
> new file mode 100644
> index 0000000000000000..707174220a76701f
> --- /dev/null
> +++ b/tools/perf/bench/uprobe.c
> @@ -0,0 +1,80 @@
> +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +/*
> + * uprobe.c
> + *
> + * uprobe benchmarks
> + *
> + * Copyright (C) 2023, Red Hat Inc, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> + */
> +#include "../perf.h"
> +#include "../util/util.h"
> +#include <subcmd/parse-options.h>
> +#include "../builtin.h"
> +#include "bench.h"
> +#include <linux/time64.h>
> +
> +#include <inttypes.h>
> +#include <stdio.h>
> +#include <sys/time.h>
> +#include <sys/types.h>
> +#include <time.h>
> +#include <unistd.h>
> +#include <stdlib.h>
> +
> +#define LOOPS_DEFAULT 1000
> +static int loops = LOOPS_DEFAULT;
> +
> +static const struct option options[] = {
> + OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
> + OPT_END()
> +};
> +
> +static const char * const bench_uprobe_usage[] = {
> + "perf bench uprobe <options>",
> + NULL
> +};
> +
> +static int bench_uprobe(int argc, const char **argv)
> +{
> + const char *name = "usleep(1000)", *unit = "usec";
> + struct timespec start, end;
> + u64 diff;
> + int i;
> +
> + argc = parse_options(argc, argv, options, bench_uprobe_usage, 0);
> +
> + clock_gettime(CLOCK_REALTIME, &start);
> +
> + for (i = 0; i < loops; i++) {
> + usleep(USEC_PER_MSEC);
> + }
> +
> + clock_gettime(CLOCK_REALTIME, &end);
> +
> + diff = end.tv_sec * NSEC_PER_SEC + end.tv_nsec - (start.tv_sec * NSEC_PER_SEC + start.tv_nsec);
> + diff /= NSEC_PER_USEC;
> +
> + switch (bench_format) {
> + case BENCH_FORMAT_DEFAULT:
> + printf("# Executed %'d %s calls\n", loops, name);
> + printf(" %14s: %'" PRIu64 " %ss\n\n", "Total time", diff, unit);
> + printf(" %'.3f %ss/op\n", (double)diff / (double)loops, unit);
> + break;
> +
> + case BENCH_FORMAT_SIMPLE:
> + printf("%" PRIu64 "\n", diff);
> + break;
> +
> + default:
> + /* reaching here is something of a disaster */
> + fprintf(stderr, "Unknown format:%d\n", bench_format);
> + exit(1);
> + }
> +
> + return 0;
> +}
> +
> +int bench_uprobe_baseline(int argc, const char **argv)
> +{
> + return bench_uprobe(argc, argv);
> +}
> diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
> index db435b791a09b69b..09637aee83413e63 100644
> --- a/tools/perf/builtin-bench.c
> +++ b/tools/perf/builtin-bench.c
> @@ -104,6 +104,11 @@ static struct bench breakpoint_benchmarks[] = {
> { NULL, NULL, NULL },
> };
>
> +static struct bench uprobe_benchmarks[] = {
> + { "baseline", "Baseline libc usleep(1000) call", bench_uprobe_baseline, },
> + { NULL, NULL, NULL },
> +};
> +
> struct collection {
> const char *name;
> const char *summary;
> @@ -123,6 +128,7 @@ static struct collection collections[] = {
> #endif
> { "internals", "Perf-internals benchmarks", internals_benchmarks },
> { "breakpoint", "Breakpoint benchmarks", breakpoint_benchmarks },
> + { "uprobe", "uprobe benchmarks", uprobe_benchmarks },
> { "all", "All benchmarks", NULL },
> { NULL, NULL, NULL }
> };
> --
> 2.41.0
>
--
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>