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Commit f91de123 authored by Rohit Gupta's avatar Rohit Gupta
Browse files

sched: Call the notify_on_migrate notifier chain for wakeups as well 



Add a change to send notify_on_migrate hints on wakeups of
foreground tasks from scheduler if their load is above
wakeup_load_thresholds (default value is 60).
These hints can be used to choose an appropriate CPU frequency
corresponding to the load of the task being woken up.

Change-Id: Ieca413c1a8bd2b14a15a7591e8e15d22925c42ca
Signed-off-by: default avatarRohit Gupta <rohgup@codeaurora.org>
parent 1f25d291

include/linux/sched/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ extern unsigned int sysctl_sched_wakeup_granularity; 
extern unsigned int sysctl_sched_child_runs_first;

extern unsigned int sysctl_sched_wake_to_idle;

extern unsigned int sysctl_sched_ravg_window;

extern unsigned int sysctl_sched_wakeup_load_threshold;



enum sched_tunable_scaling {

	SCHED_TUNABLESCALING_NONE,

kernel/sched/core.c

+12 −2
Original line number Diff line number Diff line
@@ -1592,6 +1592,7 @@ static void ttwu_queue(struct task_struct *p, int cpu) 
	raw_spin_unlock(&rq->lock);

}



__read_mostly unsigned int sysctl_sched_wakeup_load_threshold = 60;

/**

 * try_to_wake_up - wake up a thread

 * @p: the thread to be awakened
@@ -1658,7 +1659,7 @@ stat: 
out:

	raw_spin_unlock_irqrestore(&p->pi_lock, flags);



	if (src_cpu != cpu && task_notify_on_migrate(p)) {

	if (task_notify_on_migrate(p)) {

		struct migration_notify_data mnd;



		mnd.src_cpu = src_cpu;
@@ -1668,6 +1669,15 @@ out: 
				(u64)(sysctl_sched_ravg_window));

		else

			mnd.load = 0;

		/*

		 * Call the migration notifier with mnd for foreground task

		 * migrations as well as for wakeups if their load is above

		 * sysctl_sched_wakeup_load_threshold. This would prompt the

		 * cpu-boost to boost the CPU frequency on wake up of a heavy

		 * weight foreground task

		 */

		if ((src_cpu != cpu) || (mnd.load >

					sysctl_sched_wakeup_load_threshold))

			atomic_notifier_call_chain(&migration_notifier_head,

					   0, (void *)&mnd);

	}

kernel/sysctl.c

+7 −0
Original line number Diff line number Diff line
@@ -296,6 +296,13 @@ static struct ctl_table kern_table[] = { 
		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

	{

		.procname	= "sched_wakeup_load_threshold",

		.data		= &sysctl_sched_wakeup_load_threshold,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

#ifdef CONFIG_SCHED_DEBUG

	{

		.procname	= "sched_min_granularity_ns",