Fio 1.16.2
[fio.git] / memory.c
CommitLineData
2f9ade3c
JA
1/*
2 * Memory helpers
3 */
4#include <unistd.h>
5#include <sys/shm.h>
6#include <sys/mman.h>
7
8#include "fio.h"
2f9ade3c 9
2f9ade3c
JA
10static void *pinned_mem;
11
12void fio_unpin_memory(void)
13{
14 if (pinned_mem) {
15 if (munlock(pinned_mem, mlock_size) < 0)
16 perror("munlock");
17 munmap(pinned_mem, mlock_size);
18 pinned_mem = NULL;
19 }
20}
21
22int fio_pin_memory(void)
23{
24 unsigned long long phys_mem;
25
26 if (!mlock_size)
27 return 0;
28
29 /*
30 * Don't allow mlock of more than real_mem-128MB
31 */
32 phys_mem = os_phys_mem();
33 if (phys_mem) {
34 if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
35 mlock_size = phys_mem - 128 * 1024 * 1024;
6d86144d 36 log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
2f9ade3c
JA
37 }
38 }
39
40 pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
41 if (pinned_mem == MAP_FAILED) {
42 perror("malloc locked mem");
43 pinned_mem = NULL;
44 return 1;
45 }
46 if (mlock(pinned_mem, mlock_size) < 0) {
47 perror("mlock");
48 munmap(pinned_mem, mlock_size);
49 pinned_mem = NULL;
50 return 1;
51 }
52
53 return 0;
54}
55
b6f9676e 56static int alloc_mem_shm(struct thread_data *td)
2f9ade3c 57{
b6f9676e
JA
58 int flags = IPC_CREAT | SHM_R | SHM_W;
59
60 if (td->o.mem_type == MEM_SHMHUGE)
61 flags |= SHM_HUGETLB;
62
63 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
64 if (td->shm_id < 0) {
65 td_verror(td, errno, "shmget");
66 if (geteuid() != 0 && errno == ENOMEM)
67 log_err("fio: you may need to run this job as root\n");
68 if (errno == EINVAL && td->o.mem_type == MEM_SHMHUGE)
69 log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
70
71 return 1;
72 }
2f9ade3c 73
b6f9676e
JA
74 td->orig_buffer = shmat(td->shm_id, NULL, 0);
75 if (td->orig_buffer == (void *) -1) {
76 td_verror(td, errno, "shmat");
77 td->orig_buffer = NULL;
78 return 1;
79 }
80
81 return 0;
82}
83
84static int alloc_mem_mmap(struct thread_data *td)
85{
86 int flags = MAP_PRIVATE;
87
88 td->mmapfd = 0;
89
90 if (td->mmapfile) {
91 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
92
93 if (td->mmapfd < 0) {
94 td_verror(td, errno, "open mmap file");
2f9ade3c
JA
95 td->orig_buffer = NULL;
96 return 1;
97 }
b6f9676e
JA
98 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
99 td_verror(td, errno, "truncate mmap file");
2f9ade3c
JA
100 td->orig_buffer = NULL;
101 return 1;
102 }
b6f9676e
JA
103 } else
104 flags |= OS_MAP_ANON;
105
106 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
107 if (td->orig_buffer == MAP_FAILED) {
108 td_verror(td, errno, "mmap");
109 td->orig_buffer = NULL;
110 if (td->mmapfd) {
111 close(td->mmapfd);
112 unlink(td->mmapfile);
113 }
114
115 return 1;
2f9ade3c
JA
116 }
117
118 return 0;
119}
120
b6f9676e
JA
121static int alloc_mem_malloc(struct thread_data *td)
122{
123 td->orig_buffer = malloc(td->orig_buffer_size);
124 if (td->orig_buffer)
125 return 0;
126
127 return 1;
128}
129
130/*
131 * Setup the buffer area we need for io.
132 */
133int allocate_io_mem(struct thread_data *td)
134{
135 int ret = 0;
136
137 if (td->o.mem_type == MEM_MALLOC)
138 ret = alloc_mem_malloc(td);
139 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
140 ret = alloc_mem_shm(td);
141 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
142 ret = alloc_mem_mmap(td);
143 else {
144 log_err("fio: bad mem type: %d\n", td->o.mem_type);
145 ret = 1;
146 }
147
3deb3101
JA
148 if (ret)
149 td_verror(td, ENOMEM, "iomem allocation");
150
b6f9676e
JA
151 return ret;
152}
153
2f9ade3c
JA
154void free_io_mem(struct thread_data *td)
155{
2dc1bbeb 156 if (td->o.mem_type == MEM_MALLOC)
2f9ade3c 157 free(td->orig_buffer);
2dc1bbeb 158 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
2f9ade3c
JA
159 struct shmid_ds sbuf;
160
161 shmdt(td->orig_buffer);
162 shmctl(td->shm_id, IPC_RMID, &sbuf);
2dc1bbeb
JA
163 } else if (td->o.mem_type == MEM_MMAP ||
164 td->o.mem_type == MEM_MMAPHUGE) {
2f9ade3c 165 munmap(td->orig_buffer, td->orig_buffer_size);
313cb206
JA
166 if (td->mmapfile) {
167 close(td->mmapfd);
168 unlink(td->mmapfile);
169 free(td->mmapfile);
d0bdaf49
JA
170 }
171 } else
2dc1bbeb 172 log_err("Bad memory type %u\n", td->o.mem_type);
2f9ade3c
JA
173
174 td->orig_buffer = NULL;
175}