summaryrefslogtreecommitdiffstats
path: root/tools/perf/bench/uprobe.c
blob: b722ff88fe7dea4662df4fafccdf4a80649f225e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
// 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=*/"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);
}