staticchar *cmd_to_str(unsignedlong cmd)
{ switch (cmd) { case GUP_FAST_BENCHMARK: return"GUP_FAST_BENCHMARK"; case PIN_FAST_BENCHMARK: return"PIN_FAST_BENCHMARK"; case PIN_LONGTERM_BENCHMARK: return"PIN_LONGTERM_BENCHMARK"; case GUP_BASIC_TEST: return"GUP_BASIC_TEST"; case PIN_BASIC_TEST: return"PIN_BASIC_TEST"; case DUMP_USER_PAGES_TEST: return"DUMP_USER_PAGES_TEST";
} return"Unknown command";
}
void *gup_thread(void *data)
{ struct gup_test gup = *(struct gup_test *)data; int i, status;
/* Only report timing information on the *_BENCHMARK commands: */ if ((cmd == PIN_FAST_BENCHMARK) || (cmd == GUP_FAST_BENCHMARK) ||
(cmd == PIN_LONGTERM_BENCHMARK)) { for (i = 0; i < repeats; i++) {
gup.size = size;
status = ioctl(gup_fd, cmd, &gup); if (status) break;
filed = open(file, O_RDWR|O_CREAT, 0664); if (filed < 0)
ksft_exit_fail_msg("Unable to open %s: %s\n", file, strerror(errno));
gup.nr_pages_per_call = nr_pages; if (write)
gup.gup_flags |= FOLL_WRITE;
gup_fd = open(GUP_TEST_FILE, O_RDWR); if (gup_fd == -1) { switch (errno) { case EACCES: if (getuid())
ksft_print_msg("Please run this test as root\n"); break; case ENOENT: if (opendir("/sys/kernel/debug") == NULL)
ksft_print_msg("mount debugfs at /sys/kernel/debug\n");
ksft_print_msg("check if CONFIG_GUP_TEST is enabled in kernel config\n"); break; default:
ksft_print_msg("failed to open %s: %s\n", GUP_TEST_FILE, strerror(errno)); break;
}
ksft_test_result_skip("Please run this test as root\n");
ksft_exit_pass();
}
p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0); if (p == MAP_FAILED)
ksft_exit_fail_msg("mmap: %s\n", strerror(errno));
gup.addr = (unsignedlong)p;
/* *FOLL_TOUCH,ingup_test,isusedasaneither/orcase:either *faultpagesinfromthekernelviaFOLL_TOUCH,orfaultthem *inhere,fromuserspace.Thisallowscomparisonofperformance *betweenthosetwocases.
*/ if (touch) {
gup.gup_flags |= FOLL_TOUCH;
} else { for (; (unsignedlong)p < gup.addr + size; p += psize())
p[0] = 0;
}
tid = malloc(sizeof(pthread_t) * nthreads);
assert(tid); for (i = 0; i < nthreads; i++) {
ret = pthread_create(&tid[i], NULL, gup_thread, &gup);
assert(ret == 0);
} for (i = 0; i < nthreads; i++) {
ret = pthread_join(tid[i], NULL);
assert(ret == 0);
}
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