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Commit e6d6fece authored by Lingutla Chandrasekhar's avatar Lingutla Chandrasekhar Committed by Satya Durga Srinivasu Prabhala
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sched: add per CPU sched_load_boost knob 



Commit '858d5751bcf7b6a ("sched: introduce per CPU sched_load_boost
knob")' introduce a new knob sched_load_boost that allows userspace to
provide additional CPU capacity margin to work running on CPUs in
msm-4.9. Userspace could increase this for exceedingly sporadic workloads
in case the existing margin isn't sufficient.

While porting it, sched_load_boost support is ported but missed adding
procfs interface. Add it now to let user space configure the knob.

Change-Id: I4277c63089f6bb5227d257ab7484d50c42827c86
Signed-off-by: default avatarLingutla Chandrasekhar <clingutla@codeaurora.org>
parent 1774bac9

drivers/base/cpu.c

+55 −0
Original line number Original line Diff line number Diff line
@@ -211,6 +211,59 @@ static struct attribute_group cpu_isolated_attr_group = { 




#endif

#endif





static ssize_t show_sched_load_boost(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	ssize_t rc;

	unsigned int boost;

	struct cpu *cpu = container_of(dev, struct cpu, dev);

	int cpuid = cpu->dev.id;



	boost = per_cpu(sched_load_boost, cpuid);

	rc = snprintf(buf, PAGE_SIZE-2, "%d\n", boost);



	return rc;

}



static ssize_t __ref store_sched_load_boost(struct device *dev,

				struct device_attribute *attr,

				const char *buf, size_t count)

{

	int err;

	int boost;

	struct cpu *cpu = container_of(dev, struct cpu, dev);

	int cpuid = cpu->dev.id;



	err = kstrtoint(strstrip((char *)buf), 0, &boost);

	if (err)

		return err;



	/*

	 * -100 is low enough to cancel out CPU's load and make it near zro.

	 * 1000 is close to the maximum value that cpu_util_freq_{walt,pelt}

	 * can take without overflow.

	 */

	if (boost < -100 || boost > 1000)

		return -EINVAL;



	per_cpu(sched_load_boost, cpuid) = boost;



	return count;

}



static DEVICE_ATTR(sched_load_boost, 0644,

		   show_sched_load_boost,

		   store_sched_load_boost);



static struct attribute *sched_cpu_attrs[] = {

	&dev_attr_sched_load_boost.attr,

	NULL

};



static struct attribute_group sched_cpu_attr_group = {

	.attrs = sched_cpu_attrs,

};



static const struct attribute_group *common_cpu_attr_groups[] = {

static const struct attribute_group *common_cpu_attr_groups[] = {

#ifdef CONFIG_KEXEC

#ifdef CONFIG_KEXEC

	&crash_note_cpu_attr_group,

	&crash_note_cpu_attr_group,
@@ -218,6 +271,7 @@ static const struct attribute_group *common_cpu_attr_groups[] = { 
#ifdef CONFIG_HOTPLUG_CPU

#ifdef CONFIG_HOTPLUG_CPU

	&cpu_isolated_attr_group,

	&cpu_isolated_attr_group,

#endif

#endif

	&sched_cpu_attr_group,

	NULL

	NULL

};

};
@@ -228,6 +282,7 @@ static const struct attribute_group *hotplugable_cpu_attr_groups[] = { 
#ifdef CONFIG_HOTPLUG_CPU

#ifdef CONFIG_HOTPLUG_CPU

	&cpu_isolated_attr_group,

	&cpu_isolated_attr_group,

#endif

#endif

	&sched_cpu_attr_group,

	NULL

	NULL

};

};