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Commit 292bb0d3 authored by Zhipeng Gong's avatar Zhipeng Gong Committed by Zhi Wang
Browse files

drm/i915/gvt: Use real time to do timer check 



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.

v2: remove static variable. (Zhenyu)
v3: correct expire_time update. (Zhenyu)

Signed-off-by: default avatarZhipeng Gong <zhipeng.gong@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Min He <min.he@intel.com>
Signed-off-by: default avatarZhi Wang <zhi.a.wang@intel.com>
parent fadec6ee

drivers/gpu/drm/i915/gvt/sched_policy.c

+7 −2
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ struct gvt_sched_data { 
	struct hrtimer timer;

	unsigned long period;

	struct list_head lru_runq_head;

	ktime_t expire_time;

};



static void vgpu_update_timeslice(struct intel_vgpu *pre_vgpu)
@@ -226,14 +227,18 @@ 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;



	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 (cur_time >= sched_data->expire_time) {

			gvt_balance_timeslice(sched_data);

			sched_data->expire_time = ktime_add_ms(

				cur_time, GVT_TS_BALANCE_PERIOD_MS);

		}

	}

	clear_bit(INTEL_GVT_REQUEST_EVENT_SCHED, (void *)&gvt->service_request);