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Commit 12084a13 authored by Joonwoo Park's avatar Joonwoo Park
Browse files

sched: select backup CPU with least cumulative window demand 



Choose backup CPU with the least cumulative window demand among the same
CPU's demand and C-state.  Doing such keeps CPU's frequency lower.

Change-Id: I9c1e3290146ed40d98b6d73eef60b6760eb97f1c
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent f2d455ad

include/trace/events/sched.h

+5 −0
Original line number Diff line number Diff line
@@ -791,6 +791,11 @@ DEFINE_EVENT(sched_task_util, sched_task_util_energy_aware, 
	TP_PROTO(struct task_struct *p, int task_cpu, unsigned long task_util, int nominated_cpu, int target_cpu, int ediff),

	TP_ARGS(p, task_cpu, task_util, nominated_cpu, target_cpu, ediff)

);



DEFINE_EVENT(sched_task_util, sched_task_util_imbalance,

	TP_PROTO(struct task_struct *p, int task_cpu, unsigned long task_util, int nominated_cpu, int target_cpu, int ediff),

	TP_ARGS(p, task_cpu, task_util, nominated_cpu, target_cpu, ediff)

);

#endif



/*

kernel/sched/fair.c

+11 −5
Original line number Diff line number Diff line
@@ -6600,6 +6600,7 @@ static int energy_aware_wake_cpu(struct task_struct *p, int target, int sync) 
	int cpu = smp_processor_id();

	int min_util_cpu = -1;

	int min_util_cpu_idle_idx = INT_MAX;

	long min_util_cpu_util_cum = LONG_MAX;

	unsigned int min_util = UINT_MAX;

	int cpu_idle_idx;

	int min_idle_idx_cpu;
@@ -6709,16 +6710,21 @@ static int energy_aware_wake_cpu(struct task_struct *p, int target, int sync) 
				min_util_cpu = i;

				min_util = new_util;

				min_util_cpu_idle_idx = cpu_idle_idx;

				min_util_cpu_util_cum = new_util_cum;

			} else if (sysctl_sched_cstate_aware &&

				   min_util == new_util &&

				   cpu_idle_idx < min_util_cpu_idle_idx) {

				   min_util == new_util) {

				if (cpu_idle_idx < min_util_cpu_idle_idx ||

				    (cpu_idle_idx == min_util_cpu_idle_idx &&

				     min_util_cpu_util_cum > new_util_cum)) {

					min_util_cpu = i;

					min_util_cpu_idle_idx = cpu_idle_idx;

					min_util_cpu_util_cum = new_util_cum;

				}

			}

		}



		if (target_cpu == -1) {

			if (min_util_cpu != -1)

			if (likely(min_util_cpu != -1))

				target_cpu = min_util_cpu;

			else

				target_cpu = task_cpu(p);