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Commit a3dd94a1 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: I50d41aa3338803cbd45ff6314b2bb3978c59282b
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent 14888d1f

drivers/cpufreq/cpufreq.c

+31 −1
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/syscore_ops.h>

#include <linux/tick.h>

#include <linux/sched/topology.h>

#include <linux/sched/sysctl.h>



#include <trace/events/power.h>
@@ -657,11 +658,40 @@ static ssize_t show_##file_name \ 
}



show_one(cpuinfo_min_freq, cpuinfo.min_freq);

show_one(cpuinfo_max_freq, cpuinfo.max_freq);

show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);

show_one(scaling_min_freq, min);

show_one(scaling_max_freq, max);



unsigned int cpuinfo_max_freq_cached;



static bool should_use_cached_freq(int cpu)

{

	/* This is a safe check. may not be needed */

	if (!cpuinfo_max_freq_cached)

		return false;



	/*

	 * perfd already configure sched_lib_mask_force to

	 * 0xf0 from user space. so re-using it.

	 */

	if (!(BIT(cpu) & sched_lib_mask_force))

		return false;



	return is_sched_lib_based_app(current->pid);

}



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

{

	unsigned int freq = policy->cpuinfo.max_freq;



	if (should_use_cached_freq(policy->cpu))

		freq = cpuinfo_max_freq_cached << 1;

	else

		freq = policy->cpuinfo.max_freq;



	return scnprintf(buf, PAGE_SIZE, "%u\n", freq);

}



__weak unsigned int arch_freq_get_on_cpu(int cpu)

{

	return 0;

drivers/cpufreq/freq_table.c

+3 −0
Original line number Diff line number Diff line
@@ -58,6 +58,9 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, 
	policy->min = policy->cpuinfo.min_freq = min_freq;

	policy->max = policy->cpuinfo.max_freq = max_freq;



	if (max_freq > cpuinfo_max_freq_cached)

		cpuinfo_max_freq_cached = max_freq;



	if (policy->min == ~0)

		return -EINVAL;

	else

include/linux/cpufreq.h

+2 −0
Original line number Diff line number Diff line
@@ -937,4 +937,6 @@ unsigned int cpufreq_generic_get(unsigned int cpu); 
int cpufreq_generic_init(struct cpufreq_policy *policy,

		struct cpufreq_frequency_table *table,

		unsigned int transition_latency);



extern unsigned int cpuinfo_max_freq_cached;

#endif /* _LINUX_CPUFREQ_H */

include/linux/sched/sysctl.h

+1 −1
Original line number Diff line number Diff line
@@ -133,7 +133,7 @@ extern int sched_little_cluster_coloc_fmin_khz_handler(struct ctl_table *table, 


#define LIB_PATH_LENGTH 512

extern char sched_lib_name[LIB_PATH_LENGTH];

extern unsigned int sched_lib_mask_check;

extern unsigned int sched_lib_mask_force;

extern bool is_sched_lib_based_app(pid_t pid);



#endif /* _LINUX_SCHED_SYSCTL_H */

kernel/compat.c

+1 −1
Original line number Diff line number Diff line
@@ -334,7 +334,7 @@ COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 
	if (retval)

		goto out;



	retval = msm_sched_setaffinity(pid, new_mask);

	retval = sched_setaffinity(pid, new_mask);

out:

	free_cpumask_var(new_mask);

	return retval;