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
19struct gup_benchmark {
20 __u64 delta_usec;
21 __u64 addr;
22 __u64 size;
23 __u32 nr_pages_per_call;
24 __u32 flags;
25};
26
27int main(int argc, char **argv)
28{
29 struct gup_benchmark gup;
30 unsigned long size = 128 * MB;
31 int i, fd, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
32 char *p;
33
34 while ((opt = getopt(argc, argv, "m:r:n:tT")) != -1) {
35 switch (opt) {
36 case 'm':
37 size = atoi(optarg) * MB;
38 break;
39 case 'r':
40 repeats = atoi(optarg);
41 break;
42 case 'n':
43 nr_pages = atoi(optarg);
44 break;
45 case 't':
46 thp = 1;
47 break;
48 case 'T':
49 thp = 0;
50 break;
51 case 'w':
52 write = 1;
53 default:
54 return -1;
55 }
56 }
57
58 gup.nr_pages_per_call = nr_pages;
59 gup.flags = write;
60
61 fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR);
62 if (fd == -1)
63 perror("open"), exit(1);
64
65 p = mmap(NULL, size, PROT_READ | PROT_WRITE,
66 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
67 if (p == MAP_FAILED)
68 perror("mmap"), exit(1);
69 gup.addr = (unsigned long)p;
70
71 if (thp == 1)
72 madvise(p, size, MADV_HUGEPAGE);
73 else if (thp == 0)
74 madvise(p, size, MADV_NOHUGEPAGE);
75
76 for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
77 p[0] = 0;
78
79 for (i = 0; i < repeats; i++) {
80 gup.size = size;
81 if (ioctl(fd, GUP_FAST_BENCHMARK, &gup))
82 perror("ioctl"), exit(1);
83
84 printf("Time: %lld us", gup.delta_usec);
85 if (gup.size != size)
86 printf(", truncated (size: %lld)", gup.size);
87 printf("\n");
88 }
89
90 return 0;
91}