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 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 }; 101 102 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 /* Basic 10 bytes tests. */ 116 for (i = 0; i < ARRAY_SIZE(offsets); i++) { 117 struct test_data_offset *data = &offsets[i]; 118 ssize_t size; 119 u8 buf[10]; 120 121 memset(buf, 0, 10); 122 size = dso__data_read_offset(dso, &machine, data->offset, 123 buf, 10); 124 125 TEST_ASSERT_VAL("Wrong size", size == data->size); 126 TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10)); 127 } 128 129 /* Read cross multiple cache pages. */ 130 { 131 ssize_t size; 132 int c; 133 u8 *buf; 134 135 buf = malloc(TEST_FILE_SIZE); 136 TEST_ASSERT_VAL("ENOMEM\n", buf); 137 138 /* First iteration to fill caches, second one to read them. */ 139 for (c = 0; c < 2; c++) { 140 memset(buf, 0, TEST_FILE_SIZE); 141 size = dso__data_read_offset(dso, &machine, 10, 142 buf, TEST_FILE_SIZE); 143 144 TEST_ASSERT_VAL("Wrong size", 145 size == (TEST_FILE_SIZE - 10)); 146 147 for (i = 0; i < (size_t)size; i++) 148 TEST_ASSERT_VAL("Wrong data", 149 buf[i] == (i % 10)); 150 } 151 152 free(buf); 153 } 154 155 dso__delete(dso); 156 unlink(file); 157 return 0; 158 } 159 160 static long open_files_cnt(void) 161 { 162 char path[PATH_MAX]; 163 struct dirent *dent; 164 DIR *dir; 165 long nr = 0; 166 167 scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint()); 168 pr_debug("fd path: %s\n", path); 169 170 dir = opendir(path); 171 TEST_ASSERT_VAL("failed to open fd directory", dir); 172 173 while ((dent = readdir(dir)) != NULL) { 174 if (!strcmp(dent->d_name, ".") || 175 !strcmp(dent->d_name, "..")) 176 continue; 177 178 nr++; 179 } 180 181 closedir(dir); 182 return nr - 1; 183 } 184 185 static struct dso **dsos; 186 187 static int dsos__create(int cnt, int size) 188 { 189 int i; 190 191 dsos = malloc(sizeof(dsos) * cnt); 192 TEST_ASSERT_VAL("failed to alloc dsos array", dsos); 193 194 for (i = 0; i < cnt; i++) { 195 char *file; 196 197 file = test_file(size); 198 TEST_ASSERT_VAL("failed to get dso file", file); 199 200 dsos[i] = dso__new(file); 201 TEST_ASSERT_VAL("failed to get dso", dsos[i]); 202 } 203 204 return 0; 205 } 206 207 static void dsos__delete(int cnt) 208 { 209 int i; 210 211 for (i = 0; i < cnt; i++) { 212 struct dso *dso = dsos[i]; 213 214 unlink(dso->name); 215 dso__delete(dso); 216 } 217 218 free(dsos); 219 } 220 221 static int set_fd_limit(int n) 222 { 223 struct rlimit rlim; 224 225 if (getrlimit(RLIMIT_NOFILE, &rlim)) 226 return -1; 227 228 pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n); 229 230 rlim.rlim_cur = n; 231 return setrlimit(RLIMIT_NOFILE, &rlim); 232 } 233 234 int test__dso_data_cache(void) 235 { 236 struct machine machine; 237 long nr_end, nr = open_files_cnt(); 238 int dso_cnt, limit, i, fd; 239 240 memset(&machine, 0, sizeof(machine)); 241 242 /* set as system limit */ 243 limit = nr * 4; 244 TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit)); 245 246 /* and this is now our dso open FDs limit + 1 extra */ 247 dso_cnt = limit / 2 + 1; 248 TEST_ASSERT_VAL("failed to create dsos\n", 249 !dsos__create(dso_cnt, TEST_FILE_SIZE)); 250 251 for (i = 0; i < (dso_cnt - 1); i++) { 252 struct dso *dso = dsos[i]; 253 254 /* 255 * Open dsos via dso__data_fd or dso__data_read_offset. 256 * Both opens the data file and keep it open. 257 */ 258 if (i % 2) { 259 fd = dso__data_fd(dso, &machine); 260 TEST_ASSERT_VAL("failed to get fd", fd > 0); 261 } else { 262 #define BUFSIZE 10 263 u8 buf[BUFSIZE]; 264 ssize_t n; 265 266 n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE); 267 TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE); 268 } 269 } 270 271 /* open +1 dso over the allowed limit */ 272 fd = dso__data_fd(dsos[i], &machine); 273 TEST_ASSERT_VAL("failed to get fd", fd > 0); 274 275 /* should force the first one to be closed */ 276 TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1); 277 278 /* cleanup everything */ 279 dsos__delete(dso_cnt); 280 281 /* Make sure we did not leak any file descriptor. */ 282 nr_end = open_files_cnt(); 283 pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end); 284 TEST_ASSERT_VAL("failed leadking files", nr == nr_end); 285 return 0; 286 } 287 288 int test__dso_data_reopen(void) 289 { 290 struct machine machine; 291 long nr_end, nr = open_files_cnt(); 292 int fd, fd_extra; 293 294 #define dso_0 (dsos[0]) 295 #define dso_1 (dsos[1]) 296 #define dso_2 (dsos[2]) 297 298 memset(&machine, 0, sizeof(machine)); 299 300 /* 301 * Test scenario: 302 * - create 3 dso objects 303 * - set process file descriptor limit to current 304 * files count + 3 305 * - test that the first dso gets closed when we 306 * reach the files count limit 307 */ 308 309 /* Make sure we are able to open 3 fds anyway */ 310 TEST_ASSERT_VAL("failed to set file limit", 311 !set_fd_limit((nr + 3))); 312 313 TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE)); 314 315 /* open dso_0 */ 316 fd = dso__data_fd(dso_0, &machine); 317 TEST_ASSERT_VAL("failed to get fd", fd > 0); 318 319 /* open dso_1 */ 320 fd = dso__data_fd(dso_1, &machine); 321 TEST_ASSERT_VAL("failed to get fd", fd > 0); 322 323 /* 324 * open extra file descriptor and we just 325 * reached the files count limit 326 */ 327 fd_extra = open("/dev/null", O_RDONLY); 328 TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0); 329 330 /* open dso_2 */ 331 fd = dso__data_fd(dso_2, &machine); 332 TEST_ASSERT_VAL("failed to get fd", fd > 0); 333 334 /* 335 * dso_0 should get closed, because we reached 336 * the file descriptor limit 337 */ 338 TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1); 339 340 /* open dso_0 */ 341 fd = dso__data_fd(dso_0, &machine); 342 TEST_ASSERT_VAL("failed to get fd", fd > 0); 343 344 /* 345 * dso_1 should get closed, because we reached 346 * the file descriptor limit 347 */ 348 TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1); 349 350 /* cleanup everything */ 351 close(fd_extra); 352 dsos__delete(3); 353 354 /* Make sure we did not leak any file descriptor. */ 355 nr_end = open_files_cnt(); 356 pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end); 357 TEST_ASSERT_VAL("failed leadking files", nr == nr_end); 358 return 0; 359 } 360