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Commit 53994155 authored by Junjie Wu's avatar Junjie Wu
Browse files

cpufreq: interactive: Cache tunables when they are created 



Currently, tunables are only saved to per_cpu field when
CPUFREQ_GOV_POLICY_EXIT event happens. Save tunables the moment they
are created so that per_cpu cached_tunables field always matches
the tunables in use. This is useful for modifying tunable values
across clusters.

Change-Id: I9e30d5e93d6fde1282b5450458d8a605d568a0f5
Signed-off-by: default avatarJunjie Wu <junjiew@codeaurora.org>
parent 1045189e

drivers/cpufreq/cpufreq_interactive.c

+17 −17
Original line number Diff line number Diff line
@@ -1140,6 +1140,22 @@ static struct notifier_block cpufreq_interactive_idle_nb = { 
	.notifier_call = cpufreq_interactive_idle_notifier,

};



static void save_tunables(struct cpufreq_policy *policy,

			  struct cpufreq_interactive_tunables *tunables)

{

	int cpu;

	struct cpufreq_interactive_cpuinfo *pcpu;



	if (have_governor_per_policy())

		cpu = cpumask_first(policy->related_cpus);

	else

		cpu = 0;



	pcpu = &per_cpu(cpuinfo, cpu);

	WARN_ON(pcpu->cached_tunables && pcpu->cached_tunables != tunables);

	pcpu->cached_tunables = tunables;

}



static struct cpufreq_interactive_tunables *alloc_tunable(

					struct cpufreq_policy *policy)

{
@@ -1165,25 +1181,10 @@ static struct cpufreq_interactive_tunables *alloc_tunable( 
	spin_lock_init(&tunables->target_loads_lock);

	spin_lock_init(&tunables->above_hispeed_delay_lock);



	save_tunables(policy, tunables);

	return tunables;

}



static void save_tunables(struct cpufreq_policy *policy,

			  struct cpufreq_interactive_tunables *tunables)

{

	int cpu;

	struct cpufreq_interactive_cpuinfo *pcpu;



	if (have_governor_per_policy())

		cpu = cpumask_first(policy->related_cpus);

	else

		cpu = 0;



	pcpu = &per_cpu(cpuinfo, cpu);

	WARN_ON(pcpu->cached_tunables && pcpu->cached_tunables != tunables);

	pcpu->cached_tunables = tunables;

}



static struct cpufreq_interactive_tunables *restore_tunables(

						struct cpufreq_policy *policy)

{
@@ -1270,7 +1271,6 @@ static int cpufreq_governor_interactive(struct cpufreq_policy *policy, 
					get_sysfs_attr());

			if (!have_governor_per_policy())

				cpufreq_put_global_kobject();

			save_tunables(policy, tunables);

			common_tunables = NULL;

		}