1 #include <stdlib.h>
2 #include <linux/types.h>
3 #include <sys/stat.h>
4 #include <fcntl.h>
5 #include <string.h>
6 #include <sys/time.h>
7 #include <sys/resource.h>
8 #include <api/fs/fs.h>
9 #include "util.h"
10 #include "machine.h"
11 #include "symbol.h"
12 #include "tests.h"
13 #include "debug.h"
14
test_file(int size)15 static char *test_file(int size)
16 {
17 #define TEMPL "/tmp/perf-test-XXXXXX"
18 static char buf_templ[sizeof(TEMPL)];
19 char *templ = buf_templ;
20 int fd, i;
21 unsigned char *buf;
22
23 strcpy(buf_templ, TEMPL);
24 #undef TEMPL
25
26 fd = mkstemp(templ);
27 if (fd < 0) {
28 perror("mkstemp failed");
29 return NULL;
30 }
31
32 buf = malloc(size);
33 if (!buf) {
34 close(fd);
35 return NULL;
36 }
37
38 for (i = 0; i < size; i++)
39 buf[i] = (unsigned char) ((int) i % 10);
40
41 if (size != write(fd, buf, size))
42 templ = NULL;
43
44 free(buf);
45 close(fd);
46 return templ;
47 }
48
49 #define TEST_FILE_SIZE (DSO__DATA_CACHE_SIZE * 20)
50
51 struct test_data_offset {
52 off_t offset;
53 u8 data[10];
54 int size;
55 };
56
57 struct test_data_offset offsets[] = {
58 /* Fill first cache page. */
59 {
60 .offset = 10,
61 .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
62 .size = 10,
63 },
64 /* Read first cache page. */
65 {
66 .offset = 10,
67 .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
68 .size = 10,
69 },
70 /* Fill cache boundary pages. */
71 {
72 .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
73 .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
74 .size = 10,
75 },
76 /* Read cache boundary pages. */
77 {
78 .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
79 .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
80 .size = 10,
81 },
82 /* Fill final cache page. */
83 {
84 .offset = TEST_FILE_SIZE - 10,
85 .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
86 .size = 10,
87 },
88 /* Read final cache page. */
89 {
90 .offset = TEST_FILE_SIZE - 10,
91 .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
92 .size = 10,
93 },
94 /* Read final cache page. */
95 {
96 .offset = TEST_FILE_SIZE - 3,
97 .data = { 7, 8, 9, 0, 0, 0, 0, 0, 0, 0 },
98 .size = 3,
99 },
100 };
101
test__dso_data(void)102 int test__dso_data(void)
103 {
104 struct machine machine;
105 struct dso *dso;
106 char *file = test_file(TEST_FILE_SIZE);
107 size_t i;
108
109 TEST_ASSERT_VAL("No test file", file);
110
111 memset(&machine, 0, sizeof(machine));
112
113 dso = dso__new((const char *)file);
114
115 TEST_ASSERT_VAL("Failed to access to dso",
116 dso__data_fd(dso, &machine) >= 0);
117
118 /* Basic 10 bytes tests. */
119 for (i = 0; i < ARRAY_SIZE(offsets); i++) {
120 struct test_data_offset *data = &offsets[i];
121 ssize_t size;
122 u8 buf[10];
123
124 memset(buf, 0, 10);
125 size = dso__data_read_offset(dso, &machine, data->offset,
126 buf, 10);
127
128 TEST_ASSERT_VAL("Wrong size", size == data->size);
129 TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
130 }
131
132 /* Read cross multiple cache pages. */
133 {
134 ssize_t size;
135 int c;
136 u8 *buf;
137
138 buf = malloc(TEST_FILE_SIZE);
139 TEST_ASSERT_VAL("ENOMEM\n", buf);
140
141 /* First iteration to fill caches, second one to read them. */
142 for (c = 0; c < 2; c++) {
143 memset(buf, 0, TEST_FILE_SIZE);
144 size = dso__data_read_offset(dso, &machine, 10,
145 buf, TEST_FILE_SIZE);
146
147 TEST_ASSERT_VAL("Wrong size",
148 size == (TEST_FILE_SIZE - 10));
149
150 for (i = 0; i < (size_t)size; i++)
151 TEST_ASSERT_VAL("Wrong data",
152 buf[i] == (i % 10));
153 }
154
155 free(buf);
156 }
157
158 dso__delete(dso);
159 unlink(file);
160 return 0;
161 }
162
open_files_cnt(void)163 static long open_files_cnt(void)
164 {
165 char path[PATH_MAX];
166 struct dirent *dent;
167 DIR *dir;
168 long nr = 0;
169
170 scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint());
171 pr_debug("fd path: %s\n", path);
172
173 dir = opendir(path);
174 TEST_ASSERT_VAL("failed to open fd directory", dir);
175
176 while ((dent = readdir(dir)) != NULL) {
177 if (!strcmp(dent->d_name, ".") ||
178 !strcmp(dent->d_name, ".."))
179 continue;
180
181 nr++;
182 }
183
184 closedir(dir);
185 return nr - 1;
186 }
187
188 static struct dso **dsos;
189
dsos__create(int cnt,int size)190 static int dsos__create(int cnt, int size)
191 {
192 int i;
193
194 dsos = malloc(sizeof(dsos) * cnt);
195 TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
196
197 for (i = 0; i < cnt; i++) {
198 char *file;
199
200 file = test_file(size);
201 TEST_ASSERT_VAL("failed to get dso file", file);
202
203 dsos[i] = dso__new(file);
204 TEST_ASSERT_VAL("failed to get dso", dsos[i]);
205 }
206
207 return 0;
208 }
209
dsos__delete(int cnt)210 static void dsos__delete(int cnt)
211 {
212 int i;
213
214 for (i = 0; i < cnt; i++) {
215 struct dso *dso = dsos[i];
216
217 unlink(dso->name);
218 dso__delete(dso);
219 }
220
221 free(dsos);
222 }
223
set_fd_limit(int n)224 static int set_fd_limit(int n)
225 {
226 struct rlimit rlim;
227
228 if (getrlimit(RLIMIT_NOFILE, &rlim))
229 return -1;
230
231 pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n);
232
233 rlim.rlim_cur = n;
234 return setrlimit(RLIMIT_NOFILE, &rlim);
235 }
236
test__dso_data_cache(void)237 int test__dso_data_cache(void)
238 {
239 struct machine machine;
240 long nr_end, nr = open_files_cnt();
241 int dso_cnt, limit, i, fd;
242
243 memset(&machine, 0, sizeof(machine));
244
245 /* set as system limit */
246 limit = nr * 4;
247 TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));
248
249 /* and this is now our dso open FDs limit */
250 dso_cnt = limit / 2;
251 TEST_ASSERT_VAL("failed to create dsos\n",
252 !dsos__create(dso_cnt, TEST_FILE_SIZE));
253
254 for (i = 0; i < (dso_cnt - 1); i++) {
255 struct dso *dso = dsos[i];
256
257 /*
258 * Open dsos via dso__data_fd(), it opens the data
259 * file and keep it open (unless open file limit).
260 */
261 fd = dso__data_fd(dso, &machine);
262 TEST_ASSERT_VAL("failed to get fd", fd > 0);
263
264 if (i % 2) {
265 #define BUFSIZE 10
266 u8 buf[BUFSIZE];
267 ssize_t n;
268
269 n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE);
270 TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE);
271 }
272 }
273
274 /* verify the first one is already open */
275 TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);
276
277 /* open +1 dso to reach the allowed limit */
278 fd = dso__data_fd(dsos[i], &machine);
279 TEST_ASSERT_VAL("failed to get fd", fd > 0);
280
281 /* should force the first one to be closed */
282 TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1);
283
284 /* cleanup everything */
285 dsos__delete(dso_cnt);
286
287 /* Make sure we did not leak any file descriptor. */
288 nr_end = open_files_cnt();
289 pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
290 TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
291 return 0;
292 }
293
test__dso_data_reopen(void)294 int test__dso_data_reopen(void)
295 {
296 struct machine machine;
297 long nr_end, nr = open_files_cnt();
298 int fd, fd_extra;
299
300 #define dso_0 (dsos[0])
301 #define dso_1 (dsos[1])
302 #define dso_2 (dsos[2])
303
304 memset(&machine, 0, sizeof(machine));
305
306 /*
307 * Test scenario:
308 * - create 3 dso objects
309 * - set process file descriptor limit to current
310 * files count + 3
311 * - test that the first dso gets closed when we
312 * reach the files count limit
313 */
314
315 /* Make sure we are able to open 3 fds anyway */
316 TEST_ASSERT_VAL("failed to set file limit",
317 !set_fd_limit((nr + 3)));
318
319 TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));
320
321 /* open dso_0 */
322 fd = dso__data_fd(dso_0, &machine);
323 TEST_ASSERT_VAL("failed to get fd", fd > 0);
324
325 /* open dso_1 */
326 fd = dso__data_fd(dso_1, &machine);
327 TEST_ASSERT_VAL("failed to get fd", fd > 0);
328
329 /*
330 * open extra file descriptor and we just
331 * reached the files count limit
332 */
333 fd_extra = open("/dev/null", O_RDONLY);
334 TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);
335
336 /* open dso_2 */
337 fd = dso__data_fd(dso_2, &machine);
338 TEST_ASSERT_VAL("failed to get fd", fd > 0);
339
340 /*
341 * dso_0 should get closed, because we reached
342 * the file descriptor limit
343 */
344 TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);
345
346 /* open dso_0 */
347 fd = dso__data_fd(dso_0, &machine);
348 TEST_ASSERT_VAL("failed to get fd", fd > 0);
349
350 /*
351 * dso_1 should get closed, because we reached
352 * the file descriptor limit
353 */
354 TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);
355
356 /* cleanup everything */
357 close(fd_extra);
358 dsos__delete(3);
359
360 /* Make sure we did not leak any file descriptor. */
361 nr_end = open_files_cnt();
362 pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
363 TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
364 return 0;
365 }
366