Jens Axboe | 2f9ade3 | 2006-10-20 11:25:52 +0200 | [diff] [blame] | 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 | #include "os.h" |
| 10 | |
| 11 | extern unsigned long long mlock_size; |
| 12 | static void *pinned_mem; |
| 13 | |
| 14 | void fio_unpin_memory(void) |
| 15 | { |
| 16 | if (pinned_mem) { |
| 17 | if (munlock(pinned_mem, mlock_size) < 0) |
| 18 | perror("munlock"); |
| 19 | munmap(pinned_mem, mlock_size); |
| 20 | pinned_mem = NULL; |
| 21 | } |
| 22 | } |
| 23 | |
| 24 | int fio_pin_memory(void) |
| 25 | { |
| 26 | unsigned long long phys_mem; |
| 27 | |
| 28 | if (!mlock_size) |
| 29 | return 0; |
| 30 | |
| 31 | /* |
| 32 | * Don't allow mlock of more than real_mem-128MB |
| 33 | */ |
| 34 | phys_mem = os_phys_mem(); |
| 35 | if (phys_mem) { |
| 36 | if ((mlock_size + 128 * 1024 * 1024) > phys_mem) { |
| 37 | mlock_size = phys_mem - 128 * 1024 * 1024; |
| 38 | fprintf(f_out, "fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0); |
| 43 | if (pinned_mem == MAP_FAILED) { |
| 44 | perror("malloc locked mem"); |
| 45 | pinned_mem = NULL; |
| 46 | return 1; |
| 47 | } |
| 48 | if (mlock(pinned_mem, mlock_size) < 0) { |
| 49 | perror("mlock"); |
| 50 | munmap(pinned_mem, mlock_size); |
| 51 | pinned_mem = NULL; |
| 52 | return 1; |
| 53 | } |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Setup the buffer area we need for io. |
| 60 | */ |
| 61 | int allocate_io_mem(struct thread_data *td) |
| 62 | { |
| 63 | if (td->mem_type == MEM_MALLOC) |
| 64 | td->orig_buffer = malloc(td->orig_buffer_size); |
| 65 | else if (td->mem_type == MEM_SHM) { |
| 66 | td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, IPC_CREAT | 0600); |
| 67 | if (td->shm_id < 0) { |
| 68 | td_verror(td, errno); |
| 69 | perror("shmget"); |
| 70 | return 1; |
| 71 | } |
| 72 | |
| 73 | td->orig_buffer = shmat(td->shm_id, NULL, 0); |
| 74 | if (td->orig_buffer == (void *) -1) { |
| 75 | td_verror(td, errno); |
| 76 | perror("shmat"); |
| 77 | td->orig_buffer = NULL; |
| 78 | return 1; |
| 79 | } |
| 80 | } else if (td->mem_type == MEM_MMAP) { |
| 81 | td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0); |
| 82 | if (td->orig_buffer == MAP_FAILED) { |
| 83 | td_verror(td, errno); |
| 84 | perror("mmap"); |
| 85 | td->orig_buffer = NULL; |
| 86 | return 1; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | void free_io_mem(struct thread_data *td) |
| 94 | { |
| 95 | if (td->mem_type == MEM_MALLOC) |
| 96 | free(td->orig_buffer); |
| 97 | else if (td->mem_type == MEM_SHM) { |
| 98 | struct shmid_ds sbuf; |
| 99 | |
| 100 | shmdt(td->orig_buffer); |
| 101 | shmctl(td->shm_id, IPC_RMID, &sbuf); |
| 102 | } else if (td->mem_type == MEM_MMAP) |
| 103 | munmap(td->orig_buffer, td->orig_buffer_size); |
| 104 | else |
| 105 | log_err("Bad memory type %d\n", td->mem_type); |
| 106 | |
| 107 | td->orig_buffer = NULL; |
| 108 | } |