On Sat, Sep 29, 2018 at 04:43:09PM +0800, Peter Xu wrote:
> Firstly, the help in the comment region is obsolete, now we support
> three parameters. Since at it, change it and move it into the help
> message of the program.
>
> Also, the help messages dumped here and there is obsolete too. Use a
> single usage() helper.
>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Small comment below, otherwise
Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
> ---
> tools/testing/selftests/vm/userfaultfd.c | 44 ++++++++++++++----------
> 1 file changed, 26 insertions(+), 18 deletions(-)
>
> diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
> index 7b8171e3128a..2a84adaf8cf8 100644
> --- a/tools/testing/selftests/vm/userfaultfd.c
> +++ b/tools/testing/selftests/vm/userfaultfd.c
> @@ -34,18 +34,6 @@
> * per-CPU threads 1 by triggering userfaults inside
> * pthread_mutex_lock will also verify the atomicity of the memory
> * transfer (UFFDIO_COPY).
> - *
> - * The program takes two parameters: the amounts of physical memory in
> - * megabytes (MiB) of the area and the number of bounces to execute.
> - *
> - * # 100MiB 99999 bounces
> - * ./userfaultfd 100 99999
> - *
> - * # 1GiB 99 bounces
> - * ./userfaultfd 1000 99
> - *
> - * # 10MiB-~6GiB 999 bounces, continue forever unless an error triggers
> - * while ./userfaultfd $[RANDOM % 6000 + 10] 999; do true; done
> */
>
> #define _GNU_SOURCE
> @@ -115,6 +103,28 @@ pthread_attr_t attr;
> ~(unsigned long)(sizeof(unsigned long long) \
> - 1)))
>
> +const char *examples =
> + "# 100MiB 99999 bounces\n"
> + "./userfaultfd anon 100 99999\n"
> + "\n"
> + "# 1GiB 99 bounces\n"
> + "./userfaultfd anon 1000 99\n"
> + "\n"
> + "# 10MiB-~6GiB 999 bounces, continue forever unless an error triggers\n"
> + "while ./userfaultfd anon $[RANDOM % 6000 + 10] 999; do true; done\n"
> + "\n";
While at it, can you please update the examples to include other test
types?
> +
> +static void usage(void)
> +{
> + fprintf(stderr, "\nUsage: ./userfaultfd <test type> <MiB> <bounces> "
> + "[hugetlbfs_file]\n\n");
> + fprintf(stderr, "Supported <test type>: anon, hugetlb, "
> + "hugetlb_shared, shmem\n\n");
> + fprintf(stderr, "Examples:\n\n");
> + fprintf(stderr, examples);
> + exit(1);
> +}
> +
> static int anon_release_pages(char *rel_area)
> {
> int ret = 0;
> @@ -1272,8 +1282,7 @@ static void sigalrm(int sig)
> int main(int argc, char **argv)
> {
> if (argc < 4)
> - fprintf(stderr, "Usage: <test type> <MiB> <bounces> [hugetlbfs_file]\n"),
> - exit(1);
> + usage();
>
> if (signal(SIGALRM, sigalrm) == SIG_ERR)
> fprintf(stderr, "failed to arm SIGALRM"), exit(1);
> @@ -1286,20 +1295,19 @@ int main(int argc, char **argv)
> nr_cpus;
> if (!nr_pages_per_cpu) {
> fprintf(stderr, "invalid MiB\n");
> - fprintf(stderr, "Usage: <MiB> <bounces>\n"), exit(1);
> + usage();
> }
>
> bounces = atoi(argv[3]);
> if (bounces <= 0) {
> fprintf(stderr, "invalid bounces\n");
> - fprintf(stderr, "Usage: <MiB> <bounces>\n"), exit(1);
> + usage();
> }
> nr_pages = nr_pages_per_cpu * nr_cpus;
>
> if (test_type == TEST_HUGETLB) {
> if (argc < 5)
> - fprintf(stderr, "Usage: hugetlb <MiB> <bounces> <hugetlbfs_file>\n"),
> - exit(1);
> + usage();
> huge_fd = open(argv[4], O_CREAT | O_RDWR, 0755);
> if (huge_fd < 0) {
> fprintf(stderr, "Open of %s failed", argv[3]);
> --
> 2.17.1
>
--
Sincerely yours,
Mike.
