WP and MINOR modes are conditionally enabled on specific memory types. This
patch avoids dumping tons of zeros for those cases when the modes are not
supported at all.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
tools/testing/selftests/vm/userfaultfd.c | 30 ++++++++++++++++--------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index cf0cd4cb327d..5f89d258024a 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -173,16 +173,26 @@ static void uffd_stats_report(struct uffd_stats *stats, int n_cpus)
minor_total += stats[i].minor_faults;
}
- printf("userfaults: %llu missing (", miss_total);
- for (i = 0; i < n_cpus; i++)
- printf("%lu+", stats[i].missing_faults);
- printf("\b), %llu wp (", wp_total);
- for (i = 0; i < n_cpus; i++)
- printf("%lu+", stats[i].wp_faults);
- printf("\b), %llu minor (", minor_total);
- for (i = 0; i < n_cpus; i++)
- printf("%lu+", stats[i].minor_faults);
- printf("\b)\n");
+ printf("userfaults: ");
+ if (miss_total) {
+ printf("%llu missing (", miss_total);
+ for (i = 0; i < n_cpus; i++)
+ printf("%lu+", stats[i].missing_faults);
+ printf("\b) ");
+ }
+ if (wp_total) {
+ printf("%llu wp (", wp_total);
+ for (i = 0; i < n_cpus; i++)
+ printf("%lu+", stats[i].wp_faults);
+ printf("\b) ");
+ }
+ if (minor_total) {
+ printf("%llu minor (", minor_total);
+ for (i = 0; i < n_cpus; i++)
+ printf("%lu+", stats[i].minor_faults);
+ printf("\b)");
+ }
+ printf("\n");
}
static int anon_release_pages(char *rel_area)
--
2.26.2
