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Commit 12ff60f5 authored by Puja Gupta's avatar Puja Gupta Committed by Satya Durga Srinivasu Prabhala
Browse files

sched/walt: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: Idef278a9551e6d7d3c1a945dcfd8804cbc7d6aff
Signed-off-by: default avatarPuja Gupta <pujag@codeaurora.org>
parent 51e8260d

include/linux/sched/sysctl.h

+1 −1
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ extern unsigned int sysctl_sched_walt_rotate_big_tasks; 
extern unsigned int sysctl_sched_min_task_util_for_boost;

extern unsigned int sysctl_sched_min_task_util_for_colocation;

extern unsigned int sysctl_sched_asym_cap_sibling_freq_match_pct;



extern unsigned int sysctl_sched_coloc_downmigrate_ns;

extern int

walt_proc_group_thresholds_handler(struct ctl_table *table, int write,

			 void __user *buffer, size_t *lenp,

kernel/sched/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -2750,6 +2750,7 @@ struct related_thread_group { 
	struct sched_cluster *preferred_cluster;

	struct rcu_head rcu;

	u64 last_update;

	u64 downmigrate_ts;

};



extern struct sched_cluster *sched_cluster[NR_CPUS];

kernel/sched/walt.c

+26 −21
Original line number Diff line number Diff line
@@ -2487,6 +2487,7 @@ static void transfer_busy_time(struct rq *rq, struct related_thread_group *grp, 
 * The children inherits the group id from the parent.

 */

unsigned int __read_mostly sysctl_sched_enable_thread_grouping;

unsigned int __read_mostly sysctl_sched_coloc_downmigrate_ns;



struct related_thread_group *related_thread_groups[MAX_NUM_CGROUP_COLOC_ID];

static LIST_HEAD(active_related_thread_groups);
@@ -2508,30 +2509,35 @@ unsigned int __read_mostly sched_group_downmigrate = 19000000; 
unsigned int __read_mostly sysctl_sched_group_downmigrate_pct = 95;



static inline

struct sched_cluster *best_cluster(struct related_thread_group *grp,

void update_best_cluster(struct related_thread_group *grp,

				   u64 demand, bool boost)

{

	struct sched_cluster *cluster = sched_cluster[0];

	unsigned int threshold;



	if (boost) {

		cluster = sched_cluster[1];

		goto out;

		grp->preferred_cluster = sched_cluster[1];

		return;

	}



	if (!demand)

		goto out;



	if (grp->preferred_cluster == sched_cluster[1])

		threshold = sched_group_downmigrate;

	else

		threshold = sched_group_upmigrate;



	if (demand >= threshold)

		cluster = sched_cluster[1];



out:

	return cluster;

	if (grp->preferred_cluster == sched_cluster[0]) {

		if (demand >= sched_group_upmigrate)

			grp->preferred_cluster = sched_cluster[1];

		return;

	}

	if (demand < sched_group_downmigrate) {

		if (!sysctl_sched_coloc_downmigrate_ns) {

			grp->preferred_cluster = sched_cluster[0];

			return;

		}

		if (!grp->downmigrate_ts) {

			grp->downmigrate_ts = grp->last_update;

			return;

		}

		if (grp->last_update - grp->downmigrate_ts >

				sysctl_sched_coloc_downmigrate_ns) {

			grp->preferred_cluster = sched_cluster[0];

			grp->downmigrate_ts = 0;

		}

	} else if (grp->downmigrate_ts)

		grp->downmigrate_ts = 0;

}



int preferred_cluster(struct sched_cluster *cluster, struct task_struct *p)
@@ -2590,8 +2596,7 @@ static void _set_preferred_cluster(struct related_thread_group *grp) 
	}



	grp->last_update = wallclock;

	grp->preferred_cluster = best_cluster(grp, combined_demand,

					      group_boost);

	update_best_cluster(grp, combined_demand, group_boost);

	trace_sched_set_preferred_cluster(grp, combined_demand);

}

kernel/sysctl.c

+8 −0
Original line number Diff line number Diff line
@@ -412,6 +412,14 @@ static struct ctl_table kern_table[] = { 
		.extra1         = &one,

		.extra2         = &one_hundred,

	},

	{

		.procname	= "sched_coloc_downmigrate_ns",

		.data		= &sysctl_sched_coloc_downmigrate_ns,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_douintvec_minmax,

	},



#endif

#ifdef CONFIG_SMP

	{