CLOCK_MONOTONIC_RAW is not affected by NTP, so it should be THE clock
used for timing execution of tests.
v2:
- Cache the used clock (Chris)
- Do not change the clock during execution
- Spit out and error if monotonic time can not be read
Cc: Thomas Wood <thomas.wood@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
lib/igt_core.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/lib/igt_core.c b/lib/igt_core.c
index 04a0ab2..c56bc15 100644
--- a/lib/igt_core.c
+++ b/lib/igt_core.c
@@ -220,6 +220,7 @@ static char *run_single_subtest = NULL;
static bool run_single_subtest_found = false;
static const char *in_subtest = NULL;
static struct timespec subtest_time;
+static clockid_t igt_clock = (clockid_t)-1;
static bool in_fixture = false;
static bool test_with_subtests = false;
static bool in_atexit_handler = false;
@@ -341,10 +342,25 @@ static void gettime(struct timespec *ts)
{
memset(ts, 0, sizeof(*ts));
+ // Stay on the same clock for consistency.
+ if (igt_clock != (clockid_t)-1) {
+ clock_gettime(igt_clock, ts);
+ return;
+ }
+
+#ifdef CLOCK_MONOTONIC_RAW
+ if (!clock_gettime(igt_clock = CLOCK_MONOTONIC_RAW, ts))
+ return;
+#endif
#ifdef CLOCK_MONOTONIC_COARSE
- if (clock_gettime(CLOCK_MONOTONIC_COARSE, ts))
+ if (!clock_gettime(igt_clock = CLOCK_MONOTONIC_COARSE, ts))
+ return;
#endif
- clock_gettime(CLOCK_MONOTONIC, ts);
+ if (!clock_gettime(igt_clock = CLOCK_MONOTONIC, ts))
+ return;
+
+ igt_warn("Unable to get monotonic time!\n");
+ exit(IGT_EXIT_FAILURE);
}
bool __igt_fixture(void)
--
2.4.3
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