diff options
Diffstat (limited to 'tools/testing/selftests/vm/gup_benchmark.c')
-rw-r--r-- | tools/testing/selftests/vm/gup_benchmark.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c new file mode 100644 index 000000000..1d4359341 --- /dev/null +++ b/tools/testing/selftests/vm/gup_benchmark.c @@ -0,0 +1,143 @@ +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sys/prctl.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <linux/types.h> + +#define MB (1UL << 20) +#define PAGE_SIZE sysconf(_SC_PAGESIZE) + +#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) +#define GUP_BENCHMARK _IOWR('g', 2, struct gup_benchmark) + +/* Similar to above, but use FOLL_PIN instead of FOLL_GET. */ +#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_benchmark) +#define PIN_BENCHMARK _IOWR('g', 4, struct gup_benchmark) +#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_benchmark) + +/* Just the flags we need, copied from mm.h: */ +#define FOLL_WRITE 0x01 /* check pte is writable */ + +struct gup_benchmark { + __u64 get_delta_usec; + __u64 put_delta_usec; + __u64 addr; + __u64 size; + __u32 nr_pages_per_call; + __u32 flags; + __u64 expansion[10]; /* For future use */ +}; + +int main(int argc, char **argv) +{ + struct gup_benchmark gup; + unsigned long size = 128 * MB; + int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0; + int cmd = GUP_FAST_BENCHMARK, flags = MAP_PRIVATE; + char *file = "/dev/zero"; + char *p; + + while ((opt = getopt(argc, argv, "m:r:n:f:abtTLUuwSH")) != -1) { + switch (opt) { + case 'a': + cmd = PIN_FAST_BENCHMARK; + break; + case 'b': + cmd = PIN_BENCHMARK; + break; + case 'L': + cmd = PIN_LONGTERM_BENCHMARK; + break; + case 'm': + size = atoi(optarg) * MB; + break; + case 'r': + repeats = atoi(optarg); + break; + case 'n': + nr_pages = atoi(optarg); + break; + case 't': + thp = 1; + break; + case 'T': + thp = 0; + break; + case 'U': + cmd = GUP_BENCHMARK; + break; + case 'u': + cmd = GUP_FAST_BENCHMARK; + break; + case 'w': + write = 1; + break; + case 'f': + file = optarg; + break; + case 'S': + flags &= ~MAP_PRIVATE; + flags |= MAP_SHARED; + break; + case 'H': + flags |= (MAP_HUGETLB | MAP_ANONYMOUS); + break; + default: + return -1; + } + } + + filed = open(file, O_RDWR|O_CREAT); + if (filed < 0) { + perror("open"); + exit(filed); + } + + gup.nr_pages_per_call = nr_pages; + if (write) + gup.flags |= FOLL_WRITE; + + fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR); + if (fd == -1) { + perror("open"); + exit(1); + } + + p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0); + if (p == MAP_FAILED) { + perror("mmap"); + exit(1); + } + gup.addr = (unsigned long)p; + + if (thp == 1) + madvise(p, size, MADV_HUGEPAGE); + else if (thp == 0) + madvise(p, size, MADV_NOHUGEPAGE); + + for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE) + p[0] = 0; + + for (i = 0; i < repeats; i++) { + gup.size = size; + if (ioctl(fd, cmd, &gup)) { + perror("ioctl"); + exit(1); + } + + printf("Time: get:%lld put:%lld us", gup.get_delta_usec, + gup.put_delta_usec); + if (gup.size != size) + printf(", truncated (size: %lld)", gup.size); + printf("\n"); + } + + return 0; +} |