wt-status: simplify performance measurement by using getnanotime()

Calculating duration from a single uint64_t is simpler than from a struct
timeval. Change performance measurement for 'advice.statusuoption' from
gettimeofday() to getnanotime().

Also initialize t_begin to prevent uninitialized variable warning.

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/wt-status.c b/wt-status.c
index 318a191238fb831da8b72f04886b311f1c2c2567..dfdc018f1b03960096e8bb0d6f91d2011dd59df6 100644 (file)
--- a/wt-status.c
+++ b/wt-status.c
@@ -574,14 +574,11 @@ static void wt_status_collect_untracked(struct wt_status *s)
 {
        int i;
        struct dir_struct dir;
-       struct timeval t_begin;
+       uint64_t t_begin = getnanotime();
 
        if (!s->show_untracked_files)
                return;
 
-       if (advice_status_u_option)
-               gettimeofday(&t_begin, NULL);
-
        memset(&dir, 0, sizeof(dir));
        if (s->show_untracked_files != SHOW_ALL_UNTRACKED_FILES)
                dir.flags |=
@@ -612,13 +609,8 @@ static void wt_status_collect_untracked(struct wt_status *s)
        free(dir.ignored);
        clear_directory(&dir);
 
-       if (advice_status_u_option) {
-               struct timeval t_end;
-               gettimeofday(&t_end, NULL);
-               s->untracked_in_ms =
-                       (uint64_t)t_end.tv_sec * 1000 + t_end.tv_usec / 1000 -
-                       ((uint64_t)t_begin.tv_sec * 1000 + t_begin.tv_usec / 1000);
-       }
+       if (advice_status_u_option)
+               s->untracked_in_ms = (getnanotime() - t_begin) / 1000000;
 }
 
 void wt_status_collect(struct wt_status *s)