LXR linux/tools/perf/tests/dso-data.c

   1#include <dirent.h>
   2#include <stdlib.h>
   3#include <linux/kernel.h>
   4#include <linux/types.h>
   5#include <sys/stat.h>
   6#include <fcntl.h>
   7#include <string.h>
   8#include <sys/time.h>
   9#include <sys/resource.h>
  10#include <api/fs/fs.h>
  11#include "util.h"
  12#include "machine.h"
  13#include "symbol.h"
  14#include "tests.h"
  15#include "debug.h"
  16
  17static 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
  25        strcpy(buf_templ, TEMPL);
  26#undef TEMPL
  27
  28        fd = mkstemp(templ);
  29        if (fd < 0) {
  30                perror("mkstemp failed");
  31                return NULL;
  32        }
  33
  34        buf = malloc(size);
  35        if (!buf) {
  36                close(fd);
  37                return NULL;
  38        }
  39
  40        for (i = 0; i < size; i++)
  41                buf[i] = (unsigned char) ((int) i % 10);
  42
  43        if (size != write(fd, buf, size))
  44                templ = NULL;
  45
  46        free(buf);
  47        close(fd);
  48        return templ;
  49}
  50
  51#define TEST_FILE_SIZE (DSO__DATA_CACHE_SIZE * 20)
  52
  53struct test_data_offset {
  54        off_t offset;
  55        u8 data[10];
  56        int size;
  57};
  58
  59struct test_data_offset offsets[] = {
  60        /* Fill first cache page. */
  61        {
  62                .offset = 10,
  63                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  64                .size   = 10,
  65        },
  66        /* Read first cache page. */
  67        {
  68                .offset = 10,
  69                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  70                .size   = 10,
  71        },
  72        /* Fill cache boundary pages. */
  73        {
  74                .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
  75                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  76                .size   = 10,
  77        },
  78        /* Read cache boundary pages. */
  79        {
  80                .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
  81                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  82                .size   = 10,
  83        },
  84        /* Fill final cache page. */
  85        {
  86                .offset = TEST_FILE_SIZE - 10,
  87                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  88                .size   = 10,
  89        },
  90        /* Read final cache page. */
  91        {
  92                .offset = TEST_FILE_SIZE - 10,
  93                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
  94                .size   = 10,
  95        },
  96        /* Read final cache page. */
  97        {
  98                .offset = TEST_FILE_SIZE - 3,
  99                .data   = { 7, 8, 9, 0, 0, 0, 0, 0, 0, 0 },
 100                .size   = 3,
 101        },
 102};
 103
 104/* move it from util/dso.c for compatibility */
 105static int dso__data_fd(struct dso *dso, struct machine *machine)
 106{
 107        int fd = dso__data_get_fd(dso, machine);
 108
 109        if (fd >= 0)
 110                dso__data_put_fd(dso);
 111
 112        return fd;
 113}
 114
 115int test__dso_data(int subtest __maybe_unused)
 116{
 117        struct machine machine;
 118        struct dso *dso;
 119        char *file = test_file(TEST_FILE_SIZE);
 120        size_t i;
 121
 122        TEST_ASSERT_VAL("No test file", file);
 123
 124        memset(&machine, 0, sizeof(machine));
 125
 126        dso = dso__new((const char *)file);
 127
 128        TEST_ASSERT_VAL("Failed to access to dso",
 129                        dso__data_fd(dso, &machine) >= 0);
 130
 131        /* Basic 10 bytes tests. */
 132        for (i = 0; i < ARRAY_SIZE(offsets); i++) {
 133                struct test_data_offset *data = &offsets[i];
 134                ssize_t size;
 135                u8 buf[10];
 136
 137                memset(buf, 0, 10);
 138                size = dso__data_read_offset(dso, &machine, data->offset,
 139                                     buf, 10);
 140
 141                TEST_ASSERT_VAL("Wrong size", size == data->size);
 142                TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
 143        }
 144
 145        /* Read cross multiple cache pages. */
 146        {
 147                ssize_t size;
 148                int c;
 149                u8 *buf;
 150
 151                buf = malloc(TEST_FILE_SIZE);
 152                TEST_ASSERT_VAL("ENOMEM\n", buf);
 153
 154                /* First iteration to fill caches, second one to read them. */
 155                for (c = 0; c < 2; c++) {
 156                        memset(buf, 0, TEST_FILE_SIZE);
 157                        size = dso__data_read_offset(dso, &machine, 10,
 158                                                     buf, TEST_FILE_SIZE);
 159
 160                        TEST_ASSERT_VAL("Wrong size",
 161                                size == (TEST_FILE_SIZE - 10));
 162
 163                        for (i = 0; i < (size_t)size; i++)
 164                                TEST_ASSERT_VAL("Wrong data",
 165                                        buf[i] == (i % 10));
 166                }
 167
 168                free(buf);
 169        }
 170
 171        dso__put(dso);
 172        unlink(file);
 173        return 0;
 174}
 175
 176static long open_files_cnt(void)
 177{
 178        char path[PATH_MAX];
 179        struct dirent *dent;
 180        DIR *dir;
 181        long nr = 0;
 182
 183        scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint());
 184        pr_debug("fd path: %s\n", path);
 185
 186        dir = opendir(path);
 187        TEST_ASSERT_VAL("failed to open fd directory", dir);
 188
 189        while ((dent = readdir(dir)) != NULL) {
 190                if (!strcmp(dent->d_name, ".") ||
 191                    !strcmp(dent->d_name, ".."))
 192                        continue;
 193
 194                nr++;
 195        }
 196
 197        closedir(dir);
 198        return nr - 1;
 199}
 200
 201static struct dso **dsos;
 202
 203static int dsos__create(int cnt, int size)
 204{
 205        int i;
 206
 207        dsos = malloc(sizeof(*dsos) * cnt);
 208        TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
 209
 210        for (i = 0; i < cnt; i++) {
 211                char *file;
 212
 213                file = test_file(size);
 214                TEST_ASSERT_VAL("failed to get dso file", file);
 215
 216                dsos[i] = dso__new(file);
 217                TEST_ASSERT_VAL("failed to get dso", dsos[i]);
 218        }
 219
 220        return 0;
 221}
 222
 223static void dsos__delete(int cnt)
 224{
 225        int i;
 226
 227        for (i = 0; i < cnt; i++) {
 228                struct dso *dso = dsos[i];
 229
 230                unlink(dso->name);
 231                dso__put(dso);
 232        }
 233
 234        free(dsos);
 235}
 236
 237static int set_fd_limit(int n)
 238{
 239        struct rlimit rlim;
 240
 241        if (getrlimit(RLIMIT_NOFILE, &rlim))
 242                return -1;
 243
 244        pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n);
 245
 246        rlim.rlim_cur = n;
 247        return setrlimit(RLIMIT_NOFILE, &rlim);
 248}
 249
 250int test__dso_data_cache(int subtest __maybe_unused)
 251{
 252        struct machine machine;
 253        long nr_end, nr = open_files_cnt();
 254        int dso_cnt, limit, i, fd;
 255
 256        /* Rest the internal dso open counter limit. */
 257        reset_fd_limit();
 258
 259        memset(&machine, 0, sizeof(machine));
 260
 261        /* set as system limit */
 262        limit = nr * 4;
 263        TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));
 264
 265        /* and this is now our dso open FDs limit */
 266        dso_cnt = limit / 2;
 267        TEST_ASSERT_VAL("failed to create dsos\n",
 268                !dsos__create(dso_cnt, TEST_FILE_SIZE));
 269
 270        for (i = 0; i < (dso_cnt - 1); i++) {
 271                struct dso *dso = dsos[i];
 272
 273                /*
 274                 * Open dsos via dso__data_fd(), it opens the data
 275                 * file and keep it open (unless open file limit).
 276                 */
 277                fd = dso__data_fd(dso, &machine);
 278                TEST_ASSERT_VAL("failed to get fd", fd > 0);
 279
 280                if (i % 2) {
 281                        #define BUFSIZE 10
 282                        u8 buf[BUFSIZE];
 283                        ssize_t n;
 284
 285                        n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE);
 286                        TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE);
 287                }
 288        }
 289
 290        /* verify the first one is already open */
 291        TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);
 292
 293        /* open +1 dso to reach the allowed limit */
 294        fd = dso__data_fd(dsos[i], &machine);
 295        TEST_ASSERT_VAL("failed to get fd", fd > 0);
 296
 297        /* should force the first one to be closed */
 298        TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1);
 299
 300        /* cleanup everything */
 301        dsos__delete(dso_cnt);
 302
 303        /* Make sure we did not leak any file descriptor. */
 304        nr_end = open_files_cnt();
 305        pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
 306        TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
 307        return 0;
 308}
 309
 310int test__dso_data_reopen(int subtest __maybe_unused)
 311{
 312        struct machine machine;
 313        long nr_end, nr = open_files_cnt();
 314        int fd, fd_extra;
 315
 316#define dso_0 (dsos[0])
 317#define dso_1 (dsos[1])
 318#define dso_2 (dsos[2])
 319
 320        /* Rest the internal dso open counter limit. */
 321        reset_fd_limit();
 322
 323        memset(&machine, 0, sizeof(machine));
 324
 325        /*
 326         * Test scenario:
 327         * - create 3 dso objects
 328         * - set process file descriptor limit to current
 329         *   files count + 3
 330         * - test that the first dso gets closed when we
 331         *   reach the files count limit
 332         */
 333
 334        /* Make sure we are able to open 3 fds anyway */
 335        TEST_ASSERT_VAL("failed to set file limit",
 336                        !set_fd_limit((nr + 3)));
 337
 338        TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));
 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        /* open dso_1 */
 345        fd = dso__data_fd(dso_1, &machine);
 346        TEST_ASSERT_VAL("failed to get fd", fd > 0);
 347
 348        /*
 349         * open extra file descriptor and we just
 350         * reached the files count limit
 351         */
 352        fd_extra = open("/dev/null", O_RDONLY);
 353        TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);
 354
 355        /* open dso_2 */
 356        fd = dso__data_fd(dso_2, &machine);
 357        TEST_ASSERT_VAL("failed to get fd", fd > 0);
 358
 359        /*
 360         * dso_0 should get closed, because we reached
 361         * the file descriptor limit
 362         */
 363        TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);
 364
 365        /* open dso_0 */
 366        fd = dso__data_fd(dso_0, &machine);
 367        TEST_ASSERT_VAL("failed to get fd", fd > 0);
 368
 369        /*
 370         * dso_1 should get closed, because we reached
 371         * the file descriptor limit
 372         */
 373        TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);
 374
 375        /* cleanup everything */
 376        close(fd_extra);
 377        dsos__delete(3);
 378
 379        /* Make sure we did not leak any file descriptor. */
 380        nr_end = open_files_cnt();
 381        pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
 382        TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
 383        return 0;
 384}
 385