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Commit e8628dd0 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Dave Jones
Browse files

[CPUFREQ] expose cpufreq coordination requirements regardless of coordination mechanism 



Currently, affected_cpus shows which CPUs need to have their frequency
coordinated in software.  When hardware coordination is in use, the contents
of this file appear the same as when no coordination is required.  This can
lead to some confusion among user-space programs, for example, that do not
know that extra coordination is required to force a CPU core to a particular
speed to control power consumption.

To fix this, create a "related_cpus" attribute that always displays the
coordination map regardless of whatever coordination strategy the cpufreq
driver uses (sw or hw).  If the cpufreq driver does not provide a value, fall
back to policy->cpus.

Signed-off-by: default avatarDarrick J. Wong <djwong@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent e56a727b

arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c

+1 −0
Original line number Diff line number Diff line
@@ -601,6 +601,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) 
	    policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {

		policy->cpus = perf->shared_cpu_map;

	}

	policy->related_cpus = perf->shared_cpu_map;



#ifdef CONFIG_SMP

	dmi_check_system(sw_any_bug_dmi_table);

drivers/cpufreq/cpufreq.c

+24 −5
Original line number Diff line number Diff line
@@ -583,15 +583,13 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, 
	i += sprintf(&buf[i], "\n");

	return i;

}

/**

 * show_affected_cpus - show the CPUs affected by each transition

 */

static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)



static ssize_t show_cpus(cpumask_t mask, char *buf)

{

	ssize_t i = 0;

	unsigned int cpu;



	for_each_cpu_mask(cpu, policy->cpus) {

	for_each_cpu_mask(cpu, mask) {

		if (i)

			i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");

		i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
@@ -602,6 +600,25 @@ static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) 
	return i;

}



/**

 * show_related_cpus - show the CPUs affected by each transition even if

 * hw coordination is in use

 */

static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf)

{

	if (cpus_empty(policy->related_cpus))

		return show_cpus(policy->cpus, buf);

	return show_cpus(policy->related_cpus, buf);

}



/**

 * show_affected_cpus - show the CPUs affected by each transition

 */

static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)

{

	return show_cpus(policy->cpus, buf);

}



static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,

					const char *buf, size_t count)

{
@@ -646,6 +663,7 @@ define_one_ro(cpuinfo_max_freq); 
define_one_ro(scaling_available_governors);

define_one_ro(scaling_driver);

define_one_ro(scaling_cur_freq);

define_one_ro(related_cpus);

define_one_ro(affected_cpus);

define_one_rw(scaling_min_freq);

define_one_rw(scaling_max_freq);
@@ -658,6 +676,7 @@ static struct attribute *default_attrs[] = { 
	&scaling_min_freq.attr,

	&scaling_max_freq.attr,

	&affected_cpus.attr,

	&related_cpus.attr,

	&scaling_governor.attr,

	&scaling_driver.attr,

	&scaling_available_governors.attr,

include/linux/cpufreq.h

+2 −1
Original line number Diff line number Diff line
@@ -83,7 +83,8 @@ struct cpufreq_real_policy { 
};



struct cpufreq_policy {

	cpumask_t		cpus;	/* affected CPUs */

	cpumask_t		cpus;	/* CPUs requiring sw coordination */

	cpumask_t		related_cpus; /* CPUs with any coordination */

	unsigned int		shared_type; /* ANY or ALL affected CPUs

						should set cpufreq */

	unsigned int		cpu;    /* cpu nr of registered CPU */