summaryrefslogtreecommitdiffstats
path: root/tools/perf/tests/dso-data.c
blob: a4874d4ce7ef6e9eead94f9fbf7d6d71aac1d6fa (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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
// SPDX-License-Identifier: GPL-2.0
#include <dirent.h>
#include <stdlib.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <api/fs/fs.h>
#include "dso.h"
#include "util.h"
#include "machine.h"
#include "symbol.h"
#include "tests.h"
#include "debug.h"

static char *test_file(int size)
{
#define TEMPL "/tmp/perf-test-XXXXXX"
	static char buf_templ[sizeof(TEMPL)];
	char *templ = buf_templ;
	int fd, i;
	unsigned char *buf;

	strcpy(buf_templ, TEMPL);
#undef TEMPL

	fd = mkstemp(templ);
	if (fd < 0) {
		perror("mkstemp failed");
		return NULL;
	}

	buf = malloc(size);
	if (!buf) {
		close(fd);
		return NULL;
	}

	for (i = 0; i < size; i++)
		buf[i] = (unsigned char) ((int) i % 10);

	if (size != write(fd, buf, size))
		templ = NULL;

	free(buf);
	close(fd);
	return templ;
}

#define TEST_FILE_SIZE (DSO__DATA_CACHE_SIZE * 20)

struct test_data_offset {
	off_t offset;
	u8 data[10];
	int size;
};

struct test_data_offset offsets[] = {
	/* Fill first cache page. */
	{
		.offset = 10,
		.data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
		.size   = 10,
	},
	/* Read first cache page. */
	{
		.offset = 10,
		.data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
		.size   = 10,
	},
	/* Fill cache boundary pages. */
	{
		.offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
		.data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
		.size   = 10,
	},
	/* Read cache boundary pages. */
	{
		.offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
		.data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
		.size   = 10,
	},
	/* Fill final cache page. */
	{
		.offset = TEST_FILE_SIZE - 10,
		.data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
		.size   = 10,
	},
	/* Read final cache page. */
	{
		.offset = TEST_FILE_SIZE - 10,
		.data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
		.size   = 10,
	},
	/* Read final cache page. */
	{
		.offset = TEST_FILE_SIZE - 3,
		.data   = { 7, 8, 9, 0, 0, 0, 0, 0, 0, 0 },
		.size   = 3,
	},
};

/* move it from util/dso.c for compatibility */
static int dso__data_fd(struct dso *dso, struct machine *machine)
{
	int fd = dso__data_get_fd(dso, machine);

	if (fd >= 0)
		dso__data_put_fd(dso);

	return fd;
}

int test__dso_data(struct test *test __maybe_unused, int subtest __maybe_unused)
{
	struct machine machine;
	struct dso *dso;
	char *file = test_file(TEST_FILE_SIZE);
	size_t i;

	TEST_ASSERT_VAL("No test file", file);

	memset(&machine, 0, sizeof(machine));

	dso = dso__new((const char *)file);

	TEST_ASSERT_VAL("Failed to access to dso",
			dso__data_fd(dso, &machine) >= 0);

	/* Basic 10 bytes tests. */
	for (i = 0; i < ARRAY_SIZE(offsets); i++) {
		struct test_data_offset *data = &offsets[i];
		ssize_t size;
		u8 buf[10];

		memset(buf, 0, 10);
		size = dso__data_read_offset(dso, &machine, data->offset,
				     buf, 10);

		TEST_ASSERT_VAL("Wrong size", size == data->size);
		TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
	}

	/* Read cross multiple cache pages. */
	{
		ssize_t size;
		int c;
		u8 *buf;

		buf = malloc(TEST_FILE_SIZE);
		TEST_ASSERT_VAL("ENOMEM\n", buf);

		/* First iteration to fill caches, second one to read them. */
		for (c = 0; c < 2; c++) {
			memset(buf, 0, TEST_FILE_SIZE);
			size = dso__data_read_offset(dso, &machine, 10,
						     buf, TEST_FILE_SIZE);

			TEST_ASSERT_VAL("Wrong size",
				size == (TEST_FILE_SIZE - 10));

			for (i = 0; i < (size_t)size; i++)
				TEST_ASSERT_VAL("Wrong data",
					buf[i] == (i % 10));
		}

		free(buf);
	}

	dso__put(dso);
	unlink(file);
	return 0;
}

static long open_files_cnt(void)
{
	char path[PATH_MAX];
	struct dirent *dent;
	DIR *dir;
	long nr = 0;

	scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint());
	pr_debug("fd path: %s\n", path);

	dir = opendir(path);
	TEST_ASSERT_VAL("failed to open fd directory", dir);

	while ((dent = readdir(dir)) != NULL) {
		if (!strcmp(dent->d_name, ".") ||
		    !strcmp(dent->d_name, ".."))
			continue;

		nr++;
	}

	closedir(dir);
	return nr - 1;
}

static struct dso **dsos;

static int dsos__create(int cnt, int size)
{
	int i;

	dsos = malloc(sizeof(*dsos) * cnt);
	TEST_ASSERT_VAL("failed to alloc dsos array", dsos);

	for (i = 0; i < cnt; i++) {
		char *file;

		file = test_file(size);
		TEST_ASSERT_VAL("failed to get dso file", file);

		dsos[i] = dso__new(file);
		TEST_ASSERT_VAL("failed to get dso", dsos[i]);
	}

	return 0;
}

static void dsos__delete(int cnt)
{
	int i;

	for (i = 0; i < cnt; i++) {
		struct dso *dso = dsos[i];

		unlink(dso->name);
		dso__put(dso);
	}

	free(dsos);
}

static int set_fd_limit(int n)
{
	struct rlimit rlim;

	if (getrlimit(RLIMIT_NOFILE, &rlim))
		return -1;

	pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n);

	rlim.rlim_cur = n;
	return setrlimit(RLIMIT_NOFILE, &rlim);
}

int test__dso_data_cache(struct test *test __maybe_unused, int subtest __maybe_unused)
{
	struct machine machine;
	long nr_end, nr = open_files_cnt();
	int dso_cnt, limit, i, fd;

	/* Rest the internal dso open counter limit. */
	reset_fd_limit();

	memset(&machine, 0, sizeof(machine));

	/* set as system limit */
	limit = nr * 4;
	TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));

	/* and this is now our dso open FDs limit */
	dso_cnt = limit / 2;
	TEST_ASSERT_VAL("failed to create dsos\n",
		!dsos__create(dso_cnt, TEST_FILE_SIZE));

	for (i = 0; i < (dso_cnt - 1); i++) {
		struct dso *dso = dsos[i];

		/*
		 * Open dsos via dso__data_fd(), it opens the data
		 * file and keep it open (unless open file limit).
		 */
		fd = dso__data_fd(dso, &machine);
		TEST_ASSERT_VAL("failed to get fd", fd > 0);

		if (i % 2) {
			#define BUFSIZE 10
			u8 buf[BUFSIZE];
			ssize_t n;

			n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE);
			TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE);
		}
	}

	/* verify the first one is already open */
	TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);

	/* open +1 dso to reach the allowed limit */
	fd = dso__data_fd(dsos[i], &machine);
	TEST_ASSERT_VAL("failed to get fd", fd > 0);

	/* should force the first one to be closed */
	TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1);

	/* cleanup everything */
	dsos__delete(dso_cnt);

	/* Make sure we did not leak any file descriptor. */
	nr_end = open_files_cnt();
	pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
	TEST_ASSERT_VAL("failed leaking files", nr == nr_end);
	return 0;
}

int test__dso_data_reopen(struct test *test __maybe_unused, int subtest __maybe_unused)
{
	struct machine machine;
	long nr_end, nr = open_files_cnt();
	int fd, fd_extra;

#define dso_0 (dsos[0])
#define dso_1 (dsos[1])
#define dso_2 (dsos[2])

	/* Rest the internal dso open counter limit. */
	reset_fd_limit();

	memset(&machine, 0, sizeof(machine));

	/*
	 * Test scenario:
	 * - create 3 dso objects
	 * - set process file descriptor limit to current
	 *   files count + 3
	 * - test that the first dso gets closed when we
	 *   reach the files count limit
	 */

	/* Make sure we are able to open 3 fds anyway */
	TEST_ASSERT_VAL("failed to set file limit",
			!set_fd_limit((nr + 3)));

	TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));

	/* open dso_0 */
	fd = dso__data_fd(dso_0, &machine);
	TEST_ASSERT_VAL("failed to get fd", fd > 0);

	/* open dso_1 */
	fd = dso__data_fd(dso_1, &machine);
	TEST_ASSERT_VAL("failed to get fd", fd > 0);

	/*
	 * open extra file descriptor and we just
	 * reached the files count limit
	 */
	fd_extra = open("/dev/null", O_RDONLY);
	TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);

	/* open dso_2 */
	fd = dso__data_fd(dso_2, &machine);
	TEST_ASSERT_VAL("failed to get fd", fd > 0);

	/*
	 * dso_0 should get closed, because we reached
	 * the file descriptor limit
	 */
	TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);

	/* open dso_0 */
	fd = dso__data_fd(dso_0, &machine);
	TEST_ASSERT_VAL("failed to get fd", fd > 0);

	/*
	 * dso_1 should get closed, because we reached
	 * the file descriptor limit
	 */
	TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);

	/* cleanup everything */
	close(fd_extra);
	dsos__delete(3);

	/* Make sure we did not leak any file descriptor. */
	nr_end = open_files_cnt();
	pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
	TEST_ASSERT_VAL("failed leaking files", nr == nr_end);
	return 0;
}