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Commit cc64f132 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: If04d5d50971a18652a0f3dde22dca8725d20a632
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent ca81ce5a

kernel/sched/boost.c

+2 −44
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2012-2019, The Linux Foundation. All rights reserved.

 */



#include "sched.h"
@@ -22,45 +22,6 @@ static DEFINE_MUTEX(boost_mutex); 
static unsigned int freq_aggr_threshold_backup;

static int boost_refcount[MAX_NUM_BOOST_TYPE];



static inline void boost_kick(int cpu)

{

	struct rq *rq = cpu_rq(cpu);



	if (!test_and_set_bit(BOOST_KICK, &rq->walt_flags))

		smp_send_reschedule(cpu);

}



static void boost_kick_cpus(void)

{

	int i;

	struct cpumask kick_mask;



	if (boost_policy != SCHED_BOOST_ON_BIG)

		return;



	cpumask_andnot(&kick_mask, cpu_online_mask, cpu_isolated_mask);



	for_each_cpu(i, &kick_mask) {

		if (cpu_capacity(i) != max_capacity)

			boost_kick(i);

	}

}



int got_boost_kick(void)

{

	int cpu = smp_processor_id();

	struct rq *rq = cpu_rq(cpu);



	return test_bit(BOOST_KICK, &rq->walt_flags);

}



void clear_boost_kick(int cpu)

{

	struct rq *rq = cpu_rq(cpu);



	clear_bit(BOOST_KICK, &rq->walt_flags);

}



/*

 * Scheduler boost type and boost policy might at first seem unrelated,

 * however, there exists a connection between them that will allow us
@@ -126,17 +87,14 @@ static void _sched_set_boost(int type) 
		if (boost_refcount[FULL_THROTTLE_BOOST] == 1) {

			core_ctl_set_boost(true);

			restore_cgroup_boost_settings();

			boost_kick_cpus();

		}

		break;



	case CONSERVATIVE_BOOST:

	    boost_refcount[CONSERVATIVE_BOOST]++;

		if ((boost_refcount[CONSERVATIVE_BOOST] == 1) &&

				!boost_refcount[FULL_THROTTLE_BOOST]) {

				!boost_refcount[FULL_THROTTLE_BOOST])

			update_cgroup_boost_settings();

			boost_kick_cpus();

		}

		break;



	case RESTRAINED_BOOST:

kernel/sched/core.c

+1 −10
Original line number Diff line number Diff line
@@ -1802,18 +1802,9 @@ void scheduler_ipi(void) 
	 */

	preempt_fold_need_resched();



	if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick()

		&& !got_boost_kick())

	if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick())

		return;



	if (got_boost_kick()) {

		struct rq *rq = cpu_rq(cpu);



		if (rq->curr->sched_class == &fair_sched_class)

			check_for_migration(rq, rq->curr);

		clear_boost_kick(cpu);

	}



	/*

	 * Not all reschedule IPI handlers call irq_enter/irq_exit, since

	 * traditionally all their work was done from the interrupt return

kernel/sched/fair.c

+0 −3
Original line number Diff line number Diff line
@@ -12154,9 +12154,6 @@ static void walt_check_for_rotation(struct rq *src_rq) 
	if (!walt_rotation_enabled)

		return;



	if (got_boost_kick())

		return;



	if (!is_min_capacity_cpu(src_cpu))

		return;

kernel/sched/sched.h

+0 −10
Original line number Diff line number Diff line
@@ -2984,7 +2984,6 @@ static inline int same_freq_domain(int src_cpu, int dst_cpu) 
	return cpumask_test_cpu(dst_cpu, &rq->freq_domain_cpumask);

}



#define	BOOST_KICK	0

#define	CPU_RESERVED	1



extern int sched_boost(void);
@@ -3064,8 +3063,6 @@ extern unsigned long thermal_cap(int cpu); 


extern void clear_walt_request(int cpu);



extern int got_boost_kick(void);

extern void clear_boost_kick(int cpu);

extern enum sched_boost_policy sched_boost_policy(void);

extern void sched_boost_parse_dt(void);

extern void clear_ed_task(struct task_struct *p, struct rq *rq);
@@ -3230,13 +3227,6 @@ static inline int is_reserved(int cpu) 
	return 0;

}



static inline int got_boost_kick(void)

{

	return 0;

}



static inline void clear_boost_kick(int cpu) { }



static inline enum sched_boost_policy sched_boost_policy(void)

{

	return SCHED_BOOST_NONE;

kernel/sched/walt.c

+1 −2
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.

 */



#include <linux/syscore_ops.h>
@@ -405,7 +405,6 @@ void clear_walt_request(int cpu) 
	struct rq *rq = cpu_rq(cpu);

	unsigned long flags;



	clear_boost_kick(cpu);

	clear_reserved(cpu);

	if (rq->push_task) {

		struct task_struct *push_task = NULL;