tools/testing/selftests/vm/gup_benchmark.c: add MAP_HUGETLB option
[muen/linux.git] / tools / testing / selftests / vm / gup_benchmark.c
1 #include <fcntl.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5
6 #include <sys/ioctl.h>
7 #include <sys/mman.h>
8 #include <sys/prctl.h>
9 #include <sys/stat.h>
10 #include <sys/types.h>
11
12 #include <linux/types.h>
13
14 #define MB (1UL << 20)
15 #define PAGE_SIZE sysconf(_SC_PAGESIZE)
16
17 #define GUP_FAST_BENCHMARK      _IOWR('g', 1, struct gup_benchmark)
18 #define GUP_LONGTERM_BENCHMARK  _IOWR('g', 2, struct gup_benchmark)
19 #define GUP_BENCHMARK           _IOWR('g', 3, struct gup_benchmark)
20
21 struct gup_benchmark {
22         __u64 get_delta_usec;
23         __u64 put_delta_usec;
24         __u64 addr;
25         __u64 size;
26         __u32 nr_pages_per_call;
27         __u32 flags;
28 };
29
30 int main(int argc, char **argv)
31 {
32         struct gup_benchmark gup;
33         unsigned long size = 128 * MB;
34         int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
35         int cmd = GUP_FAST_BENCHMARK, flags = MAP_PRIVATE;
36         char *file = "/dev/zero";
37         char *p;
38
39         while ((opt = getopt(argc, argv, "m:r:n:f:tTLUSH")) != -1) {
40                 switch (opt) {
41                 case 'm':
42                         size = atoi(optarg) * MB;
43                         break;
44                 case 'r':
45                         repeats = atoi(optarg);
46                         break;
47                 case 'n':
48                         nr_pages = atoi(optarg);
49                         break;
50                 case 't':
51                         thp = 1;
52                         break;
53                 case 'T':
54                         thp = 0;
55                         break;
56                 case 'L':
57                         cmd = GUP_LONGTERM_BENCHMARK;
58                         break;
59                 case 'U':
60                         cmd = GUP_BENCHMARK;
61                         break;
62                 case 'w':
63                         write = 1;
64                         break;
65                 case 'f':
66                         file = optarg;
67                         break;
68                 case 'S':
69                         flags &= ~MAP_PRIVATE;
70                         flags |= MAP_SHARED;
71                         break;
72                 case 'H':
73                         flags |= MAP_HUGETLB;
74                         break;
75                 default:
76                         return -1;
77                 }
78         }
79
80         filed = open(file, O_RDWR|O_CREAT);
81         if (filed < 0) {
82                 perror("open");
83                 exit(filed);
84         }
85
86         gup.nr_pages_per_call = nr_pages;
87         gup.flags = write;
88
89         fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR);
90         if (fd == -1)
91                 perror("open"), exit(1);
92
93         p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);
94         if (p == MAP_FAILED)
95                 perror("mmap"), exit(1);
96         gup.addr = (unsigned long)p;
97
98         if (thp == 1)
99                 madvise(p, size, MADV_HUGEPAGE);
100         else if (thp == 0)
101                 madvise(p, size, MADV_NOHUGEPAGE);
102
103         for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
104                 p[0] = 0;
105
106         for (i = 0; i < repeats; i++) {
107                 gup.size = size;
108                 if (ioctl(fd, cmd, &gup))
109                         perror("ioctl"), exit(1);
110
111                 printf("Time: get:%lld put:%lld us", gup.get_delta_usec,
112                         gup.put_delta_usec);
113                 if (gup.size != size)
114                         printf(", truncated (size: %lld)", gup.size);
115                 printf("\n");
116         }
117
118         return 0;
119 }