[PATCH 1/2] drm/i915/gvt: Use real time to do timer check

[Zhipeng Gong]

intel_gvt_schedule check timer through a counter and is supposed
to wake up to increase the counter every ms.
In a system with heavy workload, gvt_service_thread can not get
a chance to run right after wake up and will be delayed several
milliseconds. As a result, one hundred counter interval means
several hundred milliseconds in real time.

This patch use real time instead of counter to do timer check.

Signed-off-by: Zhipeng Gong <zhipeng.gong at intel.com>
---
 drivers/gpu/drm/i915/gvt/sched_policy.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index 75b7bc7..f0ac281 100644
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -226,14 +226,19 @@ static void tbs_sched_func(struct gvt_sched_data *sched_data)
 void intel_gvt_schedule(struct intel_gvt *gvt)
 {
 	struct gvt_sched_data *sched_data = gvt->scheduler.sched_data;
-	static uint64_t timer_check;
+	static ktime_t check_time;
 
 	mutex_lock(&gvt->lock);
 
 	if (test_and_clear_bit(INTEL_GVT_REQUEST_SCHED,
 				(void *)&gvt->service_request)) {
-		if (!(timer_check++ % GVT_TS_BALANCE_PERIOD_MS))
+		ktime_t cur_time = ktime_get();
+
+		if (ktime_sub(cur_time, check_time) >=
+				GVT_TS_BALANCE_PERIOD_MS * NSEC_PER_MSEC) {
+			check_time = cur_time;
 			gvt_balance_timeslice(sched_data);
+		}
 	}
 	clear_bit(INTEL_GVT_REQUEST_EVENT_SCHED, (void *)&gvt->service_request);
 
-- 
2.7.4