Commit 2df27071 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf bench uprobe: Add benchmark to test uprobe overhead 



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.

Acked-by: default avatarIan Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andre Fredette <anfredet@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Dave Tucker <datucker@redhat.com>
Cc: Derek Barbosa <debarbos@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/20230719204910.539044-2-acme@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent faa4e0da

tools/perf/Documentation/perf-bench.txt

+3 −0
Original line number Diff line number Diff line
@@ -67,6 +67,9 @@ SUBSYSTEM 
'internals'::

	Benchmark internal perf functionality.



'uprobe'::

	Benchmark overhead of uprobe + BPF.



'all'::

	All benchmark subsystems.

tools/perf/bench/Build

+1 −0
Original line number Diff line number Diff line
@@ -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

tools/perf/bench/bench.h

+1 −0
Original line number Diff line number Diff line
@@ -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"

tools/perf/bench/uprobe.c

0 → 100644
+80 −0
Original line number Diff line number Diff line 
// 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@redhat.com>

 */

#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);

}

tools/perf/builtin-bench.c

+6 −0
Original line number Diff line number Diff line
@@ -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			}

};