dso-data.c 8.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <dirent.h>
  3. #include <stdlib.h>
  4. #include <linux/kernel.h>
  5. #include <linux/types.h>
  6. #include <sys/stat.h>
  7. #include <fcntl.h>
  8. #include <string.h>
  9. #include <sys/time.h>
  10. #include <sys/resource.h>
  11. #include <api/fs/fs.h>
  12. #include "dso.h"
  13. #include "machine.h"
  14. #include "symbol.h"
  15. #include "tests.h"
  16. #include "debug.h"
  17. static char *test_file(int size)
  18. {
  19. #define TEMPL "/tmp/perf-test-XXXXXX"
  20. static char buf_templ[sizeof(TEMPL)];
  21. char *templ = buf_templ;
  22. int fd, i;
  23. unsigned char *buf;
  24. strcpy(buf_templ, TEMPL);
  25. #undef TEMPL
  26. fd = mkstemp(templ);
  27. if (fd < 0) {
  28. perror("mkstemp failed");
  29. return NULL;
  30. }
  31. buf = malloc(size);
  32. if (!buf) {
  33. close(fd);
  34. return NULL;
  35. }
  36. for (i = 0; i < size; i++)
  37. buf[i] = (unsigned char) ((int) i % 10);
  38. if (size != write(fd, buf, size))
  39. templ = NULL;
  40. free(buf);
  41. close(fd);
  42. return templ;
  43. }
  44. #define TEST_FILE_SIZE (DSO__DATA_CACHE_SIZE * 20)
  45. struct test_data_offset {
  46. off_t offset;
  47. u8 data[10];
  48. int size;
  49. };
  50. struct test_data_offset offsets[] = {
  51. /* Fill first cache page. */
  52. {
  53. .offset = 10,
  54. .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  55. .size = 10,
  56. },
  57. /* Read first cache page. */
  58. {
  59. .offset = 10,
  60. .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  61. .size = 10,
  62. },
  63. /* Fill cache boundary pages. */
  64. {
  65. .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
  66. .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  67. .size = 10,
  68. },
  69. /* Read cache boundary pages. */
  70. {
  71. .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
  72. .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  73. .size = 10,
  74. },
  75. /* Fill final cache page. */
  76. {
  77. .offset = TEST_FILE_SIZE - 10,
  78. .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  79. .size = 10,
  80. },
  81. /* Read final cache page. */
  82. {
  83. .offset = TEST_FILE_SIZE - 10,
  84. .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  85. .size = 10,
  86. },
  87. /* Read final cache page. */
  88. {
  89. .offset = TEST_FILE_SIZE - 3,
  90. .data = { 7, 8, 9, 0, 0, 0, 0, 0, 0, 0 },
  91. .size = 3,
  92. },
  93. };
  94. /* move it from util/dso.c for compatibility */
  95. static int dso__data_fd(struct dso *dso, struct machine *machine)
  96. {
  97. int fd = dso__data_get_fd(dso, machine);
  98. if (fd >= 0)
  99. dso__data_put_fd(dso);
  100. return fd;
  101. }
  102. int test__dso_data(struct test *test __maybe_unused, int subtest __maybe_unused)
  103. {
  104. struct machine machine;
  105. struct dso *dso;
  106. char *file = test_file(TEST_FILE_SIZE);
  107. size_t i;
  108. TEST_ASSERT_VAL("No test file", file);
  109. memset(&machine, 0, sizeof(machine));
  110. dso = dso__new((const char *)file);
  111. TEST_ASSERT_VAL("Failed to access to dso",
  112. dso__data_fd(dso, &machine) >= 0);
  113. /* Basic 10 bytes tests. */
  114. for (i = 0; i < ARRAY_SIZE(offsets); i++) {
  115. struct test_data_offset *data = &offsets[i];
  116. ssize_t size;
  117. u8 buf[10];
  118. memset(buf, 0, 10);
  119. size = dso__data_read_offset(dso, &machine, data->offset,
  120. buf, 10);
  121. TEST_ASSERT_VAL("Wrong size", size == data->size);
  122. TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
  123. }
  124. /* Read cross multiple cache pages. */
  125. {
  126. ssize_t size;
  127. int c;
  128. u8 *buf;
  129. buf = malloc(TEST_FILE_SIZE);
  130. TEST_ASSERT_VAL("ENOMEM\n", buf);
  131. /* First iteration to fill caches, second one to read them. */
  132. for (c = 0; c < 2; c++) {
  133. memset(buf, 0, TEST_FILE_SIZE);
  134. size = dso__data_read_offset(dso, &machine, 10,
  135. buf, TEST_FILE_SIZE);
  136. TEST_ASSERT_VAL("Wrong size",
  137. size == (TEST_FILE_SIZE - 10));
  138. for (i = 0; i < (size_t)size; i++)
  139. TEST_ASSERT_VAL("Wrong data",
  140. buf[i] == (i % 10));
  141. }
  142. free(buf);
  143. }
  144. dso__put(dso);
  145. unlink(file);
  146. return 0;
  147. }
  148. static long open_files_cnt(void)
  149. {
  150. char path[PATH_MAX];
  151. struct dirent *dent;
  152. DIR *dir;
  153. long nr = 0;
  154. scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint());
  155. pr_debug("fd path: %s\n", path);
  156. dir = opendir(path);
  157. TEST_ASSERT_VAL("failed to open fd directory", dir);
  158. while ((dent = readdir(dir)) != NULL) {
  159. if (!strcmp(dent->d_name, ".") ||
  160. !strcmp(dent->d_name, ".."))
  161. continue;
  162. nr++;
  163. }
  164. closedir(dir);
  165. return nr - 1;
  166. }
  167. static struct dso **dsos;
  168. static int dsos__create(int cnt, int size)
  169. {
  170. int i;
  171. dsos = malloc(sizeof(*dsos) * cnt);
  172. TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
  173. for (i = 0; i < cnt; i++) {
  174. char *file;
  175. file = test_file(size);
  176. TEST_ASSERT_VAL("failed to get dso file", file);
  177. dsos[i] = dso__new(file);
  178. TEST_ASSERT_VAL("failed to get dso", dsos[i]);
  179. }
  180. return 0;
  181. }
  182. static void dsos__delete(int cnt)
  183. {
  184. int i;
  185. for (i = 0; i < cnt; i++) {
  186. struct dso *dso = dsos[i];
  187. unlink(dso->name);
  188. dso__put(dso);
  189. }
  190. free(dsos);
  191. }
  192. static int set_fd_limit(int n)
  193. {
  194. struct rlimit rlim;
  195. if (getrlimit(RLIMIT_NOFILE, &rlim))
  196. return -1;
  197. pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n);
  198. rlim.rlim_cur = n;
  199. return setrlimit(RLIMIT_NOFILE, &rlim);
  200. }
  201. int test__dso_data_cache(struct test *test __maybe_unused, int subtest __maybe_unused)
  202. {
  203. struct machine machine;
  204. long nr_end, nr = open_files_cnt();
  205. int dso_cnt, limit, i, fd;
  206. /* Rest the internal dso open counter limit. */
  207. reset_fd_limit();
  208. memset(&machine, 0, sizeof(machine));
  209. /* set as system limit */
  210. limit = nr * 4;
  211. TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));
  212. /* and this is now our dso open FDs limit */
  213. dso_cnt = limit / 2;
  214. TEST_ASSERT_VAL("failed to create dsos\n",
  215. !dsos__create(dso_cnt, TEST_FILE_SIZE));
  216. for (i = 0; i < (dso_cnt - 1); i++) {
  217. struct dso *dso = dsos[i];
  218. /*
  219. * Open dsos via dso__data_fd(), it opens the data
  220. * file and keep it open (unless open file limit).
  221. */
  222. fd = dso__data_fd(dso, &machine);
  223. TEST_ASSERT_VAL("failed to get fd", fd > 0);
  224. if (i % 2) {
  225. #define BUFSIZE 10
  226. u8 buf[BUFSIZE];
  227. ssize_t n;
  228. n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE);
  229. TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE);
  230. }
  231. }
  232. /* verify the first one is already open */
  233. TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);
  234. /* open +1 dso to reach the allowed limit */
  235. fd = dso__data_fd(dsos[i], &machine);
  236. TEST_ASSERT_VAL("failed to get fd", fd > 0);
  237. /* should force the first one to be closed */
  238. TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1);
  239. /* cleanup everything */
  240. dsos__delete(dso_cnt);
  241. /* Make sure we did not leak any file descriptor. */
  242. nr_end = open_files_cnt();
  243. pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
  244. TEST_ASSERT_VAL("failed leaking files", nr == nr_end);
  245. return 0;
  246. }
  247. int test__dso_data_reopen(struct test *test __maybe_unused, int subtest __maybe_unused)
  248. {
  249. struct machine machine;
  250. long nr_end, nr = open_files_cnt();
  251. int fd, fd_extra;
  252. #define dso_0 (dsos[0])
  253. #define dso_1 (dsos[1])
  254. #define dso_2 (dsos[2])
  255. /* Rest the internal dso open counter limit. */
  256. reset_fd_limit();
  257. memset(&machine, 0, sizeof(machine));
  258. /*
  259. * Test scenario:
  260. * - create 3 dso objects
  261. * - set process file descriptor limit to current
  262. * files count + 3
  263. * - test that the first dso gets closed when we
  264. * reach the files count limit
  265. */
  266. /* Make sure we are able to open 3 fds anyway */
  267. TEST_ASSERT_VAL("failed to set file limit",
  268. !set_fd_limit((nr + 3)));
  269. TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));
  270. /* open dso_0 */
  271. fd = dso__data_fd(dso_0, &machine);
  272. TEST_ASSERT_VAL("failed to get fd", fd > 0);
  273. /* open dso_1 */
  274. fd = dso__data_fd(dso_1, &machine);
  275. TEST_ASSERT_VAL("failed to get fd", fd > 0);
  276. /*
  277. * open extra file descriptor and we just
  278. * reached the files count limit
  279. */
  280. fd_extra = open("/dev/null", O_RDONLY);
  281. TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);
  282. /* open dso_2 */
  283. fd = dso__data_fd(dso_2, &machine);
  284. TEST_ASSERT_VAL("failed to get fd", fd > 0);
  285. /*
  286. * dso_0 should get closed, because we reached
  287. * the file descriptor limit
  288. */
  289. TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);
  290. /* open dso_0 */
  291. fd = dso__data_fd(dso_0, &machine);
  292. TEST_ASSERT_VAL("failed to get fd", fd > 0);
  293. /*
  294. * dso_1 should get closed, because we reached
  295. * the file descriptor limit
  296. */
  297. TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);
  298. /* cleanup everything */
  299. close(fd_extra);
  300. dsos__delete(3);
  301. /* Make sure we did not leak any file descriptor. */
  302. nr_end = open_files_cnt();
  303. pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
  304. TEST_ASSERT_VAL("failed leaking files", nr == nr_end);
  305. return 0;
  306. }