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
21struct 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
31int 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:tTLUSH")) != -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;
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}