tools/perf/tests/dso-data.c

   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 /* move it from util/dso.c for compatibility */
 103 static int dso__data_fd(struct dso *dso, struct machine *machine)
 104 {
 105         int fd = dso__data_get_fd(dso, machine);
 106
 107         if (fd >= 0)
 108                 dso__data_put_fd(dso);
 109
 110         return fd;
 111 }
 112
 113 int test__dso_data(void)
 114 {
 115         struct machine machine;
 116         struct dso *dso;
 117         char *file = test_file(TEST_FILE_SIZE);
 118         size_t i;
 119
 120         TEST_ASSERT_VAL("No test file", file);
 121
 122         memset(&machine, 0, sizeof(machine));
 123
 124         dso = dso__new((const char *)file);
 125
 126         TEST_ASSERT_VAL("Failed to access to dso",
 127                         dso__data_fd(dso, &machine) >= 0);
 128
 129         /* Basic 10 bytes tests. */
 130         for (i = 0; i < ARRAY_SIZE(offsets); i++) {
 131                 struct test_data_offset *data = &offsets[i];
 132                 ssize_t size;
 133                 u8 buf[10];
 134
 135                 memset(buf, 0, 10);
 136                 size = dso__data_read_offset(dso, &machine, data->offset,
 137                                      buf, 10);
 138
 139                 TEST_ASSERT_VAL("Wrong size", size == data->size);
 140                 TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
 141         }
 142
 143         /* Read cross multiple cache pages. */
 144         {
 145                 ssize_t size;
 146                 int c;
 147                 u8 *buf;
 148
 149                 buf = malloc(TEST_FILE_SIZE);
 150                 TEST_ASSERT_VAL("ENOMEM\n", buf);
 151
 152                 /* First iteration to fill caches, second one to read them. */
 153                 for (c = 0; c < 2; c++) {
 154                         memset(buf, 0, TEST_FILE_SIZE);
 155                         size = dso__data_read_offset(dso, &machine, 10,
 156                                                      buf, TEST_FILE_SIZE);
 157
 158                         TEST_ASSERT_VAL("Wrong size",
 159                                 size == (TEST_FILE_SIZE - 10));
 160
 161                         for (i = 0; i < (size_t)size; i++)
 162                                 TEST_ASSERT_VAL("Wrong data",
 163                                         buf[i] == (i % 10));
 164                 }
 165
 166                 free(buf);
 167         }
 168
 169         dso__put(dso);
 170         unlink(file);
 171         return 0;
 172 }
 173
 174 static long open_files_cnt(void)
 175 {
 176         char path[PATH_MAX];
 177         struct dirent *dent;
 178         DIR *dir;
 179         long nr = 0;
 180
 181         scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint());
 182         pr_debug("fd path: %s\n", path);
 183
 184         dir = opendir(path);
 185         TEST_ASSERT_VAL("failed to open fd directory", dir);
 186
 187         while ((dent = readdir(dir)) != NULL) {
 188                 if (!strcmp(dent->d_name, ".") ||
 189                     !strcmp(dent->d_name, ".."))
 190                         continue;
 191
 192                 nr++;
 193         }
 194
 195         closedir(dir);
 196         return nr - 1;
 197 }
 198
 199 static struct dso **dsos;
 200
 201 static int dsos__create(int cnt, int size)
 202 {
 203         int i;
 204
 205         dsos = malloc(sizeof(dsos) * cnt);
 206         TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
 207
 208         for (i = 0; i < cnt; i++) {
 209                 char *file;
 210
 211                 file = test_file(size);
 212                 TEST_ASSERT_VAL("failed to get dso file", file);
 213
 214                 dsos[i] = dso__new(file);
 215                 TEST_ASSERT_VAL("failed to get dso", dsos[i]);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static void dsos__delete(int cnt)
 222 {
 223         int i;
 224
 225         for (i = 0; i < cnt; i++) {
 226                 struct dso *dso = dsos[i];
 227
 228                 unlink(dso->name);
 229                 dso__put(dso);
 230         }
 231
 232         free(dsos);
 233 }
 234
 235 static int set_fd_limit(int n)
 236 {
 237         struct rlimit rlim;
 238
 239         if (getrlimit(RLIMIT_NOFILE, &rlim))
 240                 return -1;
 241
 242         pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n);
 243
 244         rlim.rlim_cur = n;
 245         return setrlimit(RLIMIT_NOFILE, &rlim);
 246 }
 247
 248 int test__dso_data_cache(void)
 249 {
 250         struct machine machine;
 251         long nr_end, nr = open_files_cnt();
 252         int dso_cnt, limit, i, fd;
 253
 254         memset(&machine, 0, sizeof(machine));
 255
 256         /* set as system limit */
 257         limit = nr * 4;
 258         TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));
 259
 260         /* and this is now our dso open FDs limit */
 261         dso_cnt = limit / 2;
 262         TEST_ASSERT_VAL("failed to create dsos\n",
 263                 !dsos__create(dso_cnt, TEST_FILE_SIZE));
 264
 265         for (i = 0; i < (dso_cnt - 1); i++) {
 266                 struct dso *dso = dsos[i];
 267
 268                 /*
 269                  * Open dsos via dso__data_fd(), it opens the data
 270                  * file and keep it open (unless open file limit).
 271                  */
 272                 fd = dso__data_fd(dso, &machine);
 273                 TEST_ASSERT_VAL("failed to get fd", fd > 0);
 274
 275                 if (i % 2) {
 276                         #define BUFSIZE 10
 277                         u8 buf[BUFSIZE];
 278                         ssize_t n;
 279
 280                         n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE);
 281                         TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE);
 282                 }
 283         }
 284
 285         /* verify the first one is already open */
 286         TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);
 287
 288         /* open +1 dso to reach the allowed limit */
 289         fd = dso__data_fd(dsos[i], &machine);
 290         TEST_ASSERT_VAL("failed to get fd", fd > 0);
 291
 292         /* should force the first one to be closed */
 293         TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1);
 294
 295         /* cleanup everything */
 296         dsos__delete(dso_cnt);
 297
 298         /* Make sure we did not leak any file descriptor. */
 299         nr_end = open_files_cnt();
 300         pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
 301         TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
 302         return 0;
 303 }
 304
 305 int test__dso_data_reopen(void)
 306 {
 307         struct machine machine;
 308         long nr_end, nr = open_files_cnt();
 309         int fd, fd_extra;
 310
 311 #define dso_0 (dsos[0])
 312 #define dso_1 (dsos[1])
 313 #define dso_2 (dsos[2])
 314
 315         memset(&machine, 0, sizeof(machine));
 316
 317         /*
 318          * Test scenario:
 319          * - create 3 dso objects
 320          * - set process file descriptor limit to current
 321          *   files count + 3
 322          * - test that the first dso gets closed when we
 323          *   reach the files count limit
 324          */
 325
 326         /* Make sure we are able to open 3 fds anyway */
 327         TEST_ASSERT_VAL("failed to set file limit",
 328                         !set_fd_limit((nr + 3)));
 329
 330         TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));
 331
 332         /* open dso_0 */
 333         fd = dso__data_fd(dso_0, &machine);
 334         TEST_ASSERT_VAL("failed to get fd", fd > 0);
 335
 336         /* open dso_1 */
 337         fd = dso__data_fd(dso_1, &machine);
 338         TEST_ASSERT_VAL("failed to get fd", fd > 0);
 339
 340         /*
 341          * open extra file descriptor and we just
 342          * reached the files count limit
 343          */
 344         fd_extra = open("/dev/null", O_RDONLY);
 345         TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);
 346
 347         /* open dso_2 */
 348         fd = dso__data_fd(dso_2, &machine);
 349         TEST_ASSERT_VAL("failed to get fd", fd > 0);
 350
 351         /*
 352          * dso_0 should get closed, because we reached
 353          * the file descriptor limit
 354          */
 355         TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);
 356
 357         /* open dso_0 */
 358         fd = dso__data_fd(dso_0, &machine);
 359         TEST_ASSERT_VAL("failed to get fd", fd > 0);
 360
 361         /*
 362          * dso_1 should get closed, because we reached
 363          * the file descriptor limit
 364          */
 365         TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);
 366
 367         /* cleanup everything */
 368         close(fd_extra);
 369         dsos__delete(3);
 370
 371         /* Make sure we did not leak any file descriptor. */
 372         nr_end = open_files_cnt();
 373         pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
 374         TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
 375         return 0;
 376 }