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// 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/compiler.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;
enum bench_uprobe {
BENCH_UPROBE__BASELINE,
BENCH_UPROBE__EMPTY,
BENCH_UPROBE__TRACE_PRINTK,
};
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
};
#ifdef HAVE_BPF_SKEL
#include "bpf_skel/bench_uprobe.skel.h"
#define bench_uprobe__attach_uprobe(prog) \
skel->links.prog = bpf_program__attach_uprobe_opts(/*prog=*/skel->progs.prog, \
/*pid=*/-1, \
/*binary_path=*/"/lib64/libc.so.6", \
/*func_offset=*/0, \
/*opts=*/&uprobe_opts); \
if (!skel->links.prog) { \
err = -errno; \
fprintf(stderr, "Failed to attach bench uprobe \"%s\": %s\n", #prog, strerror(errno)); \
goto cleanup; \
}
struct bench_uprobe_bpf *skel;
static int bench_uprobe__setup_bpf_skel(enum bench_uprobe bench)
{
DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
int err;
/* Load and verify BPF application */
skel = bench_uprobe_bpf__open();
if (!skel) {
fprintf(stderr, "Failed to open and load uprobes bench BPF skeleton\n");
return -1;
}
err = bench_uprobe_bpf__load(skel);
if (err) {
fprintf(stderr, "Failed to load and verify BPF skeleton\n");
goto cleanup;
}
uprobe_opts.func_name = "usleep";
switch (bench) {
case BENCH_UPROBE__BASELINE: break;
case BENCH_UPROBE__EMPTY: bench_uprobe__attach_uprobe(empty); break;
case BENCH_UPROBE__TRACE_PRINTK: bench_uprobe__attach_uprobe(trace_printk); break;
default:
fprintf(stderr, "Invalid bench: %d\n", bench);
goto cleanup;
}
return err;
cleanup:
bench_uprobe_bpf__destroy(skel);
skel = NULL;
return err;
}
static void bench_uprobe__teardown_bpf_skel(void)
{
if (skel) {
bench_uprobe_bpf__destroy(skel);
skel = NULL;
}
}
#else
static int bench_uprobe__setup_bpf_skel(enum bench_uprobe bench __maybe_unused) { return 0; }
static void bench_uprobe__teardown_bpf_skel(void) {};
#endif
static int bench_uprobe_format__default_fprintf(const char *name, const char *unit, u64 diff, FILE *fp)
{
static u64 baseline, previous;
s64 diff_to_baseline = diff - baseline,
diff_to_previous = diff - previous;
int printed = fprintf(fp, "# Executed %'d %s calls\n", loops, name);
printed += fprintf(fp, " %14s: %'" PRIu64 " %ss", "Total time", diff, unit);
if (baseline) {
printed += fprintf(fp, " %s%'" PRId64 " to baseline", diff_to_baseline > 0 ? "+" : "", diff_to_baseline);
if (previous != baseline)
fprintf(stdout, " %s%'" PRId64 " to previous", diff_to_previous > 0 ? "+" : "", diff_to_previous);
}
printed += fprintf(fp, "\n\n %'.3f %ss/op", (double)diff / (double)loops, unit);
if (baseline) {
printed += fprintf(fp, " %'.3f %ss/op to baseline", (double)diff_to_baseline / (double)loops, unit);
if (previous != baseline)
printed += fprintf(fp, " %'.3f %ss/op to previous", (double)diff_to_previous / (double)loops, unit);
} else {
baseline = diff;
}
fputc('\n', fp);
previous = diff;
return printed + 1;
}
static int bench_uprobe(int argc, const char **argv, enum bench_uprobe bench)
{
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);
if (bench != BENCH_UPROBE__BASELINE && bench_uprobe__setup_bpf_skel(bench) < 0)
return 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:
bench_uprobe_format__default_fprintf(name, unit, diff, stdout);
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);
}
if (bench != BENCH_UPROBE__BASELINE)
bench_uprobe__teardown_bpf_skel();
return 0;
}
int bench_uprobe_baseline(int argc, const char **argv)
{
return bench_uprobe(argc, argv, BENCH_UPROBE__BASELINE);
}
int bench_uprobe_empty(int argc, const char **argv)
{
return bench_uprobe(argc, argv, BENCH_UPROBE__EMPTY);
}
int bench_uprobe_trace_printk(int argc, const char **argv)
{
return bench_uprobe(argc, argv, BENCH_UPROBE__TRACE_PRINTK);
}
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