| 1 | /* |
| 2 | * Memory helpers |
| 3 | */ |
| 4 | #include <unistd.h> |
| 5 | #include <sys/shm.h> |
| 6 | #include <sys/mman.h> |
| 7 | |
| 8 | #include "fio.h" |
| 9 | |
| 10 | static void *pinned_mem; |
| 11 | |
| 12 | void fio_unpin_memory(void) |
| 13 | { |
| 14 | if (pinned_mem) { |
| 15 | dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size); |
| 16 | if (munlock(pinned_mem, mlock_size) < 0) |
| 17 | perror("munlock"); |
| 18 | munmap(pinned_mem, mlock_size); |
| 19 | pinned_mem = NULL; |
| 20 | } |
| 21 | } |
| 22 | |
| 23 | int fio_pin_memory(void) |
| 24 | { |
| 25 | unsigned long long phys_mem; |
| 26 | |
| 27 | if (!mlock_size) |
| 28 | return 0; |
| 29 | |
| 30 | dprint(FD_MEM, "pinning %llu bytes\n", mlock_size); |
| 31 | |
| 32 | /* |
| 33 | * Don't allow mlock of more than real_mem-128MB |
| 34 | */ |
| 35 | phys_mem = os_phys_mem(); |
| 36 | if (phys_mem) { |
| 37 | if ((mlock_size + 128 * 1024 * 1024) > phys_mem) { |
| 38 | mlock_size = phys_mem - 128 * 1024 * 1024; |
| 39 | log_info("fio: limiting mlocked memory to %lluMiB\n", |
| 40 | mlock_size >> 20); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, |
| 45 | MAP_PRIVATE | OS_MAP_ANON, 0, 0); |
| 46 | if (pinned_mem == MAP_FAILED) { |
| 47 | perror("malloc locked mem"); |
| 48 | pinned_mem = NULL; |
| 49 | return 1; |
| 50 | } |
| 51 | if (mlock(pinned_mem, mlock_size) < 0) { |
| 52 | perror("mlock"); |
| 53 | munmap(pinned_mem, mlock_size); |
| 54 | pinned_mem = NULL; |
| 55 | return 1; |
| 56 | } |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static int alloc_mem_shm(struct thread_data *td) |
| 62 | { |
| 63 | int flags = IPC_CREAT | SHM_R | SHM_W; |
| 64 | |
| 65 | if (td->o.mem_type == MEM_SHMHUGE) |
| 66 | flags |= SHM_HUGETLB; |
| 67 | |
| 68 | td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags); |
| 69 | dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id); |
| 70 | if (td->shm_id < 0) { |
| 71 | td_verror(td, errno, "shmget"); |
| 72 | if (geteuid() != 0 && errno == ENOMEM) |
| 73 | log_err("fio: you may need to run this job as root\n"); |
| 74 | if (td->o.mem_type == MEM_SHMHUGE) { |
| 75 | if (errno == EINVAL) { |
| 76 | log_err("fio: check that you have free huge" |
| 77 | " pages and that hugepage-size is" |
| 78 | " correct.\n"); |
| 79 | } else if (errno == ENOSYS) { |
| 80 | log_err("fio: your system does not appear to" |
| 81 | " support huge pages.\n"); |
| 82 | } else if (errno == ENOMEM) { |
| 83 | log_err("fio: no huge pages available, do you" |
| 84 | " need to alocate some? See HOWTO.\n"); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | return 1; |
| 89 | } |
| 90 | |
| 91 | td->orig_buffer = shmat(td->shm_id, NULL, 0); |
| 92 | dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer); |
| 93 | if (td->orig_buffer == (void *) -1) { |
| 94 | td_verror(td, errno, "shmat"); |
| 95 | td->orig_buffer = NULL; |
| 96 | return 1; |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int alloc_mem_mmap(struct thread_data *td) |
| 103 | { |
| 104 | int flags = MAP_PRIVATE; |
| 105 | |
| 106 | td->mmapfd = 0; |
| 107 | |
| 108 | if (td->mmapfile) { |
| 109 | td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644); |
| 110 | |
| 111 | if (td->mmapfd < 0) { |
| 112 | td_verror(td, errno, "open mmap file"); |
| 113 | td->orig_buffer = NULL; |
| 114 | return 1; |
| 115 | } |
| 116 | if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) { |
| 117 | td_verror(td, errno, "truncate mmap file"); |
| 118 | td->orig_buffer = NULL; |
| 119 | return 1; |
| 120 | } |
| 121 | } else |
| 122 | flags |= OS_MAP_ANON; |
| 123 | |
| 124 | td->orig_buffer = mmap(NULL, td->orig_buffer_size, |
| 125 | PROT_READ | PROT_WRITE, flags, td->mmapfd, 0); |
| 126 | dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd, |
| 127 | td->orig_buffer); |
| 128 | if (td->orig_buffer == MAP_FAILED) { |
| 129 | td_verror(td, errno, "mmap"); |
| 130 | td->orig_buffer = NULL; |
| 131 | if (td->mmapfd) { |
| 132 | close(td->mmapfd); |
| 133 | unlink(td->mmapfile); |
| 134 | } |
| 135 | |
| 136 | return 1; |
| 137 | } |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int alloc_mem_malloc(struct thread_data *td) |
| 143 | { |
| 144 | unsigned int bsize = td->orig_buffer_size; |
| 145 | |
| 146 | if (td->o.odirect) |
| 147 | bsize += page_mask; |
| 148 | |
| 149 | td->orig_buffer = malloc(bsize); |
| 150 | dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer); |
| 151 | if (td->orig_buffer) |
| 152 | return 0; |
| 153 | |
| 154 | return 1; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Setup the buffer area we need for io. |
| 159 | */ |
| 160 | int allocate_io_mem(struct thread_data *td) |
| 161 | { |
| 162 | int ret = 0; |
| 163 | |
| 164 | if (td->io_ops->flags & FIO_NOIO) |
| 165 | return 0; |
| 166 | |
| 167 | if (td->o.mem_type == MEM_MALLOC) |
| 168 | ret = alloc_mem_malloc(td); |
| 169 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) |
| 170 | ret = alloc_mem_shm(td); |
| 171 | else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE) |
| 172 | ret = alloc_mem_mmap(td); |
| 173 | else { |
| 174 | log_err("fio: bad mem type: %d\n", td->o.mem_type); |
| 175 | ret = 1; |
| 176 | } |
| 177 | |
| 178 | if (ret) |
| 179 | td_verror(td, ENOMEM, "iomem allocation"); |
| 180 | |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | void free_io_mem(struct thread_data *td) |
| 185 | { |
| 186 | if (td->o.mem_type == MEM_MALLOC) { |
| 187 | dprint(FD_MEM, "free mem %p\n", td->orig_buffer); |
| 188 | free(td->orig_buffer); |
| 189 | } else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) { |
| 190 | struct shmid_ds sbuf; |
| 191 | |
| 192 | dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id, |
| 193 | td->orig_buffer); |
| 194 | shmdt(td->orig_buffer); |
| 195 | shmctl(td->shm_id, IPC_RMID, &sbuf); |
| 196 | } else if (td->o.mem_type == MEM_MMAP || |
| 197 | td->o.mem_type == MEM_MMAPHUGE) { |
| 198 | dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size, |
| 199 | td->orig_buffer); |
| 200 | munmap(td->orig_buffer, td->orig_buffer_size); |
| 201 | if (td->mmapfile) { |
| 202 | close(td->mmapfd); |
| 203 | unlink(td->mmapfile); |
| 204 | free(td->mmapfile); |
| 205 | } |
| 206 | } else |
| 207 | log_err("Bad memory type %u\n", td->o.mem_type); |
| 208 | |
| 209 | td->orig_buffer = NULL; |
| 210 | } |