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Commit 6c7d9537 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti Committed by Satya Durga Srinivasu Prabhala
Browse files

sched/fair: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: I7c3a073fa68d715dd3bdbed11e4f83e82046a3c0
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent 37db9fec

kernel/sched/core.c

+8 −6
Original line number Diff line number Diff line
@@ -8444,7 +8444,7 @@ void sched_account_irqtime(int cpu, struct task_struct *curr, 
				u64 delta, u64 wallclock)

{

	struct rq *rq = cpu_rq(cpu);

	unsigned long flags, nr_windows;

	unsigned long flags, nr_ticks;

	u64 cur_jiffies_ts;



	raw_spin_lock_irqsave(&rq->lock, flags);
@@ -8460,18 +8460,20 @@ void sched_account_irqtime(int cpu, struct task_struct *curr, 
		walt_update_task_ravg(curr, rq, IRQ_UPDATE, sched_ktime_clock(),

								delta);



	nr_windows = cur_jiffies_ts - rq->irqload_ts;

	nr_ticks = cur_jiffies_ts - rq->irqload_ts;



	if (nr_windows) {

		if (nr_windows < 10) {

	if (nr_ticks) {

		if (nr_ticks < 10) {

			/* Decay CPU's irqload by 3/4 for each window. */

			rq->avg_irqload *= (3 * nr_windows);

			rq->avg_irqload *= (3 * nr_ticks);

			rq->avg_irqload = div64_u64(rq->avg_irqload,

							4 * nr_windows);

							4 * nr_ticks);

		} else {

			rq->avg_irqload = 0;

		}

		rq->avg_irqload += rq->cur_irqload;

		rq->high_irqload = (rq->avg_irqload >=

				    sysctl_sched_cpu_high_irqload);

		rq->cur_irqload = 0;

	}

kernel/sched/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -1076,6 +1076,7 @@ struct rq { 
	u64			cur_irqload;

	u64			avg_irqload;

	u64			irqload_ts;

	bool			high_irqload;

	struct task_struct	*ed_task;

	struct cpu_cycle	cc;

	u64			old_busy_time, old_busy_time_group;

kernel/sched/walt.h

+5 −1
Original line number Diff line number Diff line
@@ -85,6 +85,10 @@ extern void __weak mark_task_starting(struct task_struct *p); 
extern void __weak set_window_start(struct rq *rq);

extern bool __weak do_pl_notif(struct rq *rq);



/*

 * This is only for tracepoints to print the avg irq load. For

 * task placment considerations, use sched_cpu_high_irqload().

 */

#define SCHED_HIGH_IRQ_TIMEOUT 3

static inline u64 sched_irqload(int cpu)

{
@@ -107,7 +111,7 @@ static inline u64 sched_irqload(int cpu) 


static inline int sched_cpu_high_irqload(int cpu)

{

	return sched_irqload(cpu) >= sysctl_sched_cpu_high_irqload;

	return cpu_rq(cpu)->high_irqload;

}



static inline int exiting_task(struct task_struct *p)