10 #include <sys/types.h>
12 #include <linux/types.h>
14 #define MB (1UL << 20)
15 #define PAGE_SIZE sysconf(_SC_PAGESIZE)
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)
21 struct gup_benchmark {
26 __u32 nr_pages_per_call;
28 __u64 expansion[10]; /* For future use */
31 int main(int argc, char **argv)
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";
40 while ((opt = getopt(argc, argv, "m:r:n:f:tTLUSH")) != -1) {
43 size = atoi(optarg) * MB;
46 repeats = atoi(optarg);
49 nr_pages = atoi(optarg);
58 cmd = GUP_LONGTERM_BENCHMARK;
70 flags &= ~MAP_PRIVATE;
81 filed = open(file, O_RDWR|O_CREAT);
87 gup.nr_pages_per_call = nr_pages;
90 fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR);
92 perror("open"), exit(1);
94 p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);
96 perror("mmap"), exit(1);
97 gup.addr = (unsigned long)p;
100 madvise(p, size, MADV_HUGEPAGE);
102 madvise(p, size, MADV_NOHUGEPAGE);
104 for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
107 for (i = 0; i < repeats; i++) {
109 if (ioctl(fd, cmd, &gup))
110 perror("ioctl"), exit(1);
112 printf("Time: get:%lld put:%lld us", gup.get_delta_usec,
114 if (gup.size != size)
115 printf(", truncated (size: %lld)", gup.size);