Verify requeue handling
[fio.git] / memory.c
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 static void *pinned_mem;
12
13 void fio_unpin_memory(void)
14 {
15         if (pinned_mem) {
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         /*
31          * Don't allow mlock of more than real_mem-128MB
32          */
33         phys_mem = os_phys_mem();
34         if (phys_mem) {
35                 if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
36                         mlock_size = phys_mem - 128 * 1024 * 1024;
37                         fprintf(f_out, "fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
38                 }
39         }
40
41         pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
42         if (pinned_mem == MAP_FAILED) {
43                 perror("malloc locked mem");
44                 pinned_mem = NULL;
45                 return 1;
46         }
47         if (mlock(pinned_mem, mlock_size) < 0) {
48                 perror("mlock");
49                 munmap(pinned_mem, mlock_size);
50                 pinned_mem = NULL;
51                 return 1;
52         }
53
54         return 0;
55 }
56
57 /*
58  * Setup the buffer area we need for io.
59  */
60 int allocate_io_mem(struct thread_data *td)
61 {
62         if (td->mem_type == MEM_MALLOC)
63                 td->orig_buffer = malloc(td->orig_buffer_size);
64         else if (td->mem_type == MEM_SHM || td->mem_type == MEM_SHMHUGE) {
65                 int flags = IPC_CREAT | SHM_R | SHM_W;
66
67                 if (td->mem_type == MEM_SHMHUGE)
68                         flags |= SHM_HUGETLB;
69
70                 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
71                 if (td->shm_id < 0) {
72                         td_verror(td, errno);
73                         perror("shmget");
74                         return 1;
75                 }
76
77                 td->orig_buffer = shmat(td->shm_id, NULL, 0);
78                 if (td->orig_buffer == (void *) -1) {
79                         td_verror(td, errno);
80                         perror("shmat");
81                         td->orig_buffer = NULL;
82                         return 1;
83                 }
84         } else if (td->mem_type == MEM_MMAP || td->mem_type == MEM_MMAPHUGE) {
85                 int flags = MAP_PRIVATE;
86
87                 td->mmapfd = 0;
88
89                 if (td->mmapfile) {
90                         td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
91
92                         if (td->mmapfd < 0) {
93                                 td_verror(td, errno);
94                                 perror("open mmap file");
95                                 td->orig_buffer = NULL;
96                                 return 1;
97                         }
98                 } else
99                         flags |= OS_MAP_ANON;
100
101                 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
102                 if (td->orig_buffer == MAP_FAILED) {
103                         td_verror(td, errno);
104                         perror("mmap");
105                         td->orig_buffer = NULL;
106                         if (td->mmapfd) {
107                                 close(td->mmapfd);
108                                 unlink(td->mmapfile);
109                         }
110                                 
111                         return 1;
112                 }
113         }
114
115         return 0;
116 }
117
118 void free_io_mem(struct thread_data *td)
119 {
120         if (td->mem_type == MEM_MALLOC)
121                 free(td->orig_buffer);
122         else if (td->mem_type == MEM_SHM || td->mem_type == MEM_SHMHUGE) {
123                 struct shmid_ds sbuf;
124
125                 shmdt(td->orig_buffer);
126                 shmctl(td->shm_id, IPC_RMID, &sbuf);
127         } else if (td->mem_type == MEM_MMAP || td->mem_type == MEM_MMAPHUGE) {
128                 munmap(td->orig_buffer, td->orig_buffer_size);
129                 if (td->mmapfile) {
130                         close(td->mmapfd);
131                         unlink(td->mmapfile);
132                         free(td->mmapfile);
133                 }
134         } else
135                 log_err("Bad memory type %u\n", td->mem_type);
136
137         td->orig_buffer = NULL;
138 }