Jens Axboe | e502435 | 2020-02-11 20:34:12 -0700 | [diff] [blame] | 1 | /* SPDX-License-Identifier: MIT */ |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Description: basic fadvise test |
| 4 | */ |
| 5 | #include <errno.h> |
| 6 | #include <stdio.h> |
| 7 | #include <unistd.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | #include <fcntl.h> |
| 11 | #include <sys/types.h> |
| 12 | #include <sys/time.h> |
| 13 | |
| 14 | #include "liburing.h" |
| 15 | |
| 16 | #define FILE_SIZE (128 * 1024) |
| 17 | #define LOOPS 100 |
Jens Axboe | 4aca25a | 2019-12-26 11:09:34 -0700 | [diff] [blame] | 18 | #define MIN_LOOPS 10 |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 19 | |
| 20 | static unsigned long long utime_since(const struct timeval *s, |
| 21 | const struct timeval *e) |
| 22 | { |
| 23 | long long sec, usec; |
| 24 | |
| 25 | sec = e->tv_sec - s->tv_sec; |
| 26 | usec = (e->tv_usec - s->tv_usec); |
| 27 | if (sec > 0 && usec < 0) { |
| 28 | sec--; |
| 29 | usec += 1000000; |
| 30 | } |
| 31 | |
| 32 | sec *= 1000000; |
| 33 | return sec + usec; |
| 34 | } |
| 35 | |
| 36 | static unsigned long long utime_since_now(struct timeval *tv) |
| 37 | { |
| 38 | struct timeval end; |
| 39 | |
| 40 | gettimeofday(&end, NULL); |
| 41 | return utime_since(tv, &end); |
| 42 | } |
| 43 | |
| 44 | static int create_file(const char *file) |
| 45 | { |
| 46 | ssize_t ret; |
| 47 | char *buf; |
| 48 | int fd; |
| 49 | |
| 50 | buf = malloc(FILE_SIZE); |
| 51 | memset(buf, 0xaa, FILE_SIZE); |
| 52 | |
| 53 | fd = open(file, O_WRONLY | O_CREAT, 0644); |
| 54 | if (fd < 0) { |
| 55 | perror("open file"); |
| 56 | return 1; |
| 57 | } |
| 58 | ret = write(fd, buf, FILE_SIZE); |
| 59 | fsync(fd); |
| 60 | close(fd); |
| 61 | return ret != FILE_SIZE; |
| 62 | } |
| 63 | |
| 64 | static int do_fadvise(struct io_uring *ring, int fd, off_t offset, off_t len, |
| 65 | int advice) |
| 66 | { |
| 67 | struct io_uring_sqe *sqe; |
| 68 | struct io_uring_cqe *cqe; |
| 69 | int ret; |
| 70 | |
| 71 | sqe = io_uring_get_sqe(ring); |
| 72 | if (!sqe) { |
| 73 | fprintf(stderr, "failed to get sqe\n"); |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | io_uring_prep_fadvise(sqe, fd, offset, len, advice); |
| 78 | sqe->user_data = advice; |
| 79 | ret = io_uring_submit_and_wait(ring, 1); |
| 80 | if (ret != 1) { |
| 81 | fprintf(stderr, "submit: %d\n", ret); |
| 82 | return 1; |
| 83 | } |
| 84 | |
| 85 | ret = io_uring_wait_cqe(ring, &cqe); |
| 86 | if (ret) { |
| 87 | fprintf(stderr, "wait: %d\n", ret); |
| 88 | return 1; |
| 89 | } |
| 90 | |
| 91 | ret = cqe->res; |
Jens Axboe | e421b9e | 2019-12-26 11:37:54 -0700 | [diff] [blame] | 92 | if (ret == -EINVAL || ret == -EBADF) { |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 93 | fprintf(stdout, "Fadvise not supported, skipping\n"); |
Guillem Jover | 8bf676e | 2020-02-08 23:16:51 +0100 | [diff] [blame] | 94 | unlink(".fadvise.tmp"); |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 95 | exit(0); |
| 96 | } else if (ret) { |
| 97 | fprintf(stderr, "cqe->res=%d\n", cqe->res); |
| 98 | } |
| 99 | io_uring_cqe_seen(ring, cqe); |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | static long do_read(int fd, char *buf) |
| 104 | { |
| 105 | struct timeval tv; |
| 106 | int ret; |
| 107 | long t; |
| 108 | |
| 109 | ret = lseek(fd, 0, SEEK_SET); |
| 110 | if (ret) { |
| 111 | perror("lseek"); |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | gettimeofday(&tv, NULL); |
| 116 | ret = read(fd, buf, FILE_SIZE); |
| 117 | t = utime_since_now(&tv); |
| 118 | if (ret < 0) { |
| 119 | perror("read"); |
| 120 | return -1; |
| 121 | } else if (ret != FILE_SIZE) { |
| 122 | fprintf(stderr, "short read1: %d\n", ret); |
| 123 | return -1; |
| 124 | } |
| 125 | |
| 126 | return t; |
| 127 | } |
| 128 | |
| 129 | static int test_fadvise(struct io_uring *ring, const char *filename) |
| 130 | { |
| 131 | unsigned long cached_read, uncached_read, cached_read2; |
| 132 | int fd, ret; |
| 133 | char *buf; |
| 134 | |
| 135 | fd = open(filename, O_RDONLY); |
| 136 | if (fd < 0) { |
| 137 | perror("open"); |
| 138 | return 1; |
| 139 | } |
| 140 | |
| 141 | buf = malloc(FILE_SIZE); |
| 142 | |
| 143 | cached_read = do_read(fd, buf); |
| 144 | if (cached_read == -1) |
| 145 | return 1; |
| 146 | |
| 147 | ret = do_fadvise(ring, fd, 0, FILE_SIZE, POSIX_FADV_DONTNEED); |
| 148 | if (ret) |
| 149 | return 1; |
| 150 | |
| 151 | uncached_read = do_read(fd, buf); |
| 152 | if (uncached_read == -1) |
| 153 | return 1; |
| 154 | |
| 155 | ret = do_fadvise(ring, fd, 0, FILE_SIZE, POSIX_FADV_DONTNEED); |
| 156 | if (ret) |
| 157 | return 1; |
| 158 | |
| 159 | ret = do_fadvise(ring, fd, 0, FILE_SIZE, POSIX_FADV_WILLNEED); |
| 160 | if (ret) |
| 161 | return 1; |
| 162 | |
| 163 | fsync(fd); |
| 164 | |
| 165 | cached_read2 = do_read(fd, buf); |
| 166 | if (cached_read2 == -1) |
| 167 | return 1; |
| 168 | |
| 169 | if (cached_read < uncached_read && |
| 170 | cached_read2 < uncached_read) |
| 171 | return 0; |
| 172 | |
| 173 | return 2; |
| 174 | } |
| 175 | |
| 176 | int main(int argc, char *argv[]) |
| 177 | { |
| 178 | struct io_uring ring; |
| 179 | int ret, i, good, bad; |
Jens Axboe | 5967ae5 | 2020-05-19 21:58:01 -0600 | [diff] [blame] | 180 | char *fname; |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 181 | |
Jens Axboe | 5967ae5 | 2020-05-19 21:58:01 -0600 | [diff] [blame] | 182 | if (argc > 1) { |
| 183 | fname = argv[1]; |
| 184 | } else { |
| 185 | fname = ".fadvise.tmp"; |
| 186 | if (create_file(".fadvise.tmp")) { |
| 187 | fprintf(stderr, "file creation failed\n"); |
| 188 | goto err; |
| 189 | } |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 190 | } |
| 191 | if (io_uring_queue_init(8, &ring, 0)) { |
| 192 | fprintf(stderr, "ring creation failed\n"); |
| 193 | goto err; |
| 194 | } |
| 195 | |
| 196 | good = bad = 0; |
| 197 | for (i = 0; i < LOOPS; i++) { |
Jens Axboe | 5967ae5 | 2020-05-19 21:58:01 -0600 | [diff] [blame] | 198 | ret = test_fadvise(&ring, fname); |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 199 | if (ret == 1) { |
| 200 | fprintf(stderr, "read_fadvise failed\n"); |
| 201 | goto err; |
| 202 | } else if (!ret) |
| 203 | good++; |
| 204 | else if (ret == 2) |
| 205 | bad++; |
Jens Axboe | 4aca25a | 2019-12-26 11:09:34 -0700 | [diff] [blame] | 206 | if (i >= MIN_LOOPS && !bad) |
| 207 | break; |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 208 | } |
| 209 | if (bad > good) { |
| 210 | fprintf(stderr, "Suspicious timings\n"); |
| 211 | goto err; |
| 212 | } |
| 213 | |
Jens Axboe | 5967ae5 | 2020-05-19 21:58:01 -0600 | [diff] [blame] | 214 | if (fname != argv[1]) |
| 215 | unlink(fname); |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 216 | io_uring_queue_exit(&ring); |
| 217 | return 0; |
| 218 | err: |
Jens Axboe | 5967ae5 | 2020-05-19 21:58:01 -0600 | [diff] [blame] | 219 | if (fname != argv[1]) |
| 220 | unlink(fname); |
Jens Axboe | ebba242 | 2019-12-26 10:36:01 -0700 | [diff] [blame] | 221 | return 1; |
| 222 | } |