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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 	__u64 expansion[10];	/* For future use */
29 };
30 
main(int argc,char ** argv)31 int main(int argc, char **argv)
32 {
33 	struct gup_benchmark gup;
34 	unsigned long size = 128 * MB;
35 	int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
36 	int cmd = GUP_FAST_BENCHMARK, flags = MAP_PRIVATE;
37 	char *file = "/dev/zero";
38 	char *p;
39 
40 	while ((opt = getopt(argc, argv, "m:r:n:f:tTLUwSH")) != -1) {
41 		switch (opt) {
42 		case 'm':
43 			size = atoi(optarg) * MB;
44 			break;
45 		case 'r':
46 			repeats = atoi(optarg);
47 			break;
48 		case 'n':
49 			nr_pages = atoi(optarg);
50 			break;
51 		case 't':
52 			thp = 1;
53 			break;
54 		case 'T':
55 			thp = 0;
56 			break;
57 		case 'L':
58 			cmd = GUP_LONGTERM_BENCHMARK;
59 			break;
60 		case 'U':
61 			cmd = GUP_BENCHMARK;
62 			break;
63 		case 'w':
64 			write = 1;
65 			break;
66 		case 'f':
67 			file = optarg;
68 			break;
69 		case 'S':
70 			flags &= ~MAP_PRIVATE;
71 			flags |= MAP_SHARED;
72 			break;
73 		case 'H':
74 			flags |= (MAP_HUGETLB | MAP_ANONYMOUS);
75 			break;
76 		default:
77 			return -1;
78 		}
79 	}
80 
81 	filed = open(file, O_RDWR|O_CREAT);
82 	if (filed < 0) {
83 		perror("open");
84 		exit(filed);
85 	}
86 
87 	gup.nr_pages_per_call = nr_pages;
88 	gup.flags = write;
89 
90 	fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR);
91 	if (fd == -1)
92 		perror("open"), exit(1);
93 
94 	p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);
95 	if (p == MAP_FAILED)
96 		perror("mmap"), exit(1);
97 	gup.addr = (unsigned long)p;
98 
99 	if (thp == 1)
100 		madvise(p, size, MADV_HUGEPAGE);
101 	else if (thp == 0)
102 		madvise(p, size, MADV_NOHUGEPAGE);
103 
104 	for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
105 		p[0] = 0;
106 
107 	for (i = 0; i < repeats; i++) {
108 		gup.size = size;
109 		if (ioctl(fd, cmd, &gup))
110 			perror("ioctl"), exit(1);
111 
112 		printf("Time: get:%lld put:%lld us", gup.get_delta_usec,
113 			gup.put_delta_usec);
114 		if (gup.size != size)
115 			printf(", truncated (size: %lld)", gup.size);
116 		printf("\n");
117 	}
118 
119 	return 0;
120 }
121