tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/* Similar to above, but use FOLL_PIN instead of FOLL_GET. */
22#define PIN_FAST_BENCHMARK _IOWR('g', 4, struct gup_benchmark)
23#define PIN_BENCHMARK _IOWR('g', 5, struct gup_benchmark)
24
25/* Just the flags we need, copied from mm.h: */
26#define FOLL_WRITE 0x01 /* check pte is writable */
27
28struct gup_benchmark {
29 __u64 get_delta_usec;
30 __u64 put_delta_usec;
31 __u64 addr;
32 __u64 size;
33 __u32 nr_pages_per_call;
34 __u32 flags;
35 __u64 expansion[10]; /* For future use */
36};
37
38int main(int argc, char **argv)
39{
40 struct gup_benchmark gup;
41 unsigned long size = 128 * MB;
42 int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
43 int cmd = GUP_FAST_BENCHMARK, flags = MAP_PRIVATE;
44 char *file = "/dev/zero";
45 char *p;
46
47 while ((opt = getopt(argc, argv, "m:r:n:f:abtTLUuwSH")) != -1) {
48 switch (opt) {
49 case 'a':
50 cmd = PIN_FAST_BENCHMARK;
51 break;
52 case 'b':
53 cmd = PIN_BENCHMARK;
54 break;
55 case 'm':
56 size = atoi(optarg) * MB;
57 break;
58 case 'r':
59 repeats = atoi(optarg);
60 break;
61 case 'n':
62 nr_pages = atoi(optarg);
63 break;
64 case 't':
65 thp = 1;
66 break;
67 case 'T':
68 thp = 0;
69 break;
70 case 'L':
71 cmd = GUP_LONGTERM_BENCHMARK;
72 break;
73 case 'U':
74 cmd = GUP_BENCHMARK;
75 break;
76 case 'u':
77 cmd = GUP_FAST_BENCHMARK;
78 break;
79 case 'w':
80 write = 1;
81 break;
82 case 'f':
83 file = optarg;
84 break;
85 case 'S':
86 flags &= ~MAP_PRIVATE;
87 flags |= MAP_SHARED;
88 break;
89 case 'H':
90 flags |= (MAP_HUGETLB | MAP_ANONYMOUS);
91 break;
92 default:
93 return -1;
94 }
95 }
96
97 filed = open(file, O_RDWR|O_CREAT);
98 if (filed < 0) {
99 perror("open");
100 exit(filed);
101 }
102
103 gup.nr_pages_per_call = nr_pages;
104 if (write)
105 gup.flags |= FOLL_WRITE;
106
107 fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR);
108 if (fd == -1)
109 perror("open"), exit(1);
110
111 p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);
112 if (p == MAP_FAILED)
113 perror("mmap"), exit(1);
114 gup.addr = (unsigned long)p;
115
116 if (thp == 1)
117 madvise(p, size, MADV_HUGEPAGE);
118 else if (thp == 0)
119 madvise(p, size, MADV_NOHUGEPAGE);
120
121 for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
122 p[0] = 0;
123
124 for (i = 0; i < repeats; i++) {
125 gup.size = size;
126 if (ioctl(fd, cmd, &gup))
127 perror("ioctl"), exit(1);
128
129 printf("Time: get:%lld put:%lld us", gup.get_delta_usec,
130 gup.put_delta_usec);
131 if (gup.size != size)
132 printf(", truncated (size: %lld)", gup.size);
133 printf("\n");
134 }
135
136 return 0;
137}