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![Viresh Kumar](/assets/img/avatar_default.png)
Currently update_sampling_rate() runs over each online CPU and cancels/queues timers on all policy->cpus every time. This should be done just once for any cpu belonging to a policy. Create a cpumask and keep on clearing it as and when we process policies, so that we don't have to traverse through all CPUs of the same policy. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
645 lines
18 KiB
C
645 lines
18 KiB
C
/*
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* drivers/cpufreq/cpufreq_ondemand.c
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*
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* Copyright (C) 2001 Russell King
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* (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
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* Jun Nakajima <jun.nakajima@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpu.h>
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#include <linux/percpu-defs.h>
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#include <linux/slab.h>
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#include <linux/tick.h>
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#include "cpufreq_governor.h"
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/* On-demand governor macros */
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#define DEF_FREQUENCY_UP_THRESHOLD (80)
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#define DEF_SAMPLING_DOWN_FACTOR (1)
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#define MAX_SAMPLING_DOWN_FACTOR (100000)
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#define MICRO_FREQUENCY_UP_THRESHOLD (95)
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#define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000)
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#define MIN_FREQUENCY_UP_THRESHOLD (11)
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#define MAX_FREQUENCY_UP_THRESHOLD (100)
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static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);
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static struct od_ops od_ops;
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#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
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static struct cpufreq_governor cpufreq_gov_ondemand;
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#endif
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static unsigned int default_powersave_bias;
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static void ondemand_powersave_bias_init_cpu(int cpu)
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{
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struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
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dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
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dbs_info->freq_lo = 0;
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}
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/*
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* Not all CPUs want IO time to be accounted as busy; this depends on how
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* efficient idling at a higher frequency/voltage is.
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* Pavel Machek says this is not so for various generations of AMD and old
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* Intel systems.
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* Mike Chan (android.com) claims this is also not true for ARM.
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* Because of this, whitelist specific known (series) of CPUs by default, and
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* leave all others up to the user.
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*/
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static int should_io_be_busy(void)
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{
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#if defined(CONFIG_X86)
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/*
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* For Intel, Core 2 (model 15) and later have an efficient idle.
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*/
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if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
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boot_cpu_data.x86 == 6 &&
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boot_cpu_data.x86_model >= 15)
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return 1;
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#endif
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return 0;
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}
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/*
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* Find right freq to be set now with powersave_bias on.
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* Returns the freq_hi to be used right now and will set freq_hi_jiffies,
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* freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
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*/
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static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
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unsigned int freq_next, unsigned int relation)
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{
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unsigned int freq_req, freq_reduc, freq_avg;
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unsigned int freq_hi, freq_lo;
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unsigned int index = 0;
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unsigned int jiffies_total, jiffies_hi, jiffies_lo;
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struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
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policy->cpu);
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struct dbs_data *dbs_data = policy->governor_data;
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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if (!dbs_info->freq_table) {
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dbs_info->freq_lo = 0;
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dbs_info->freq_lo_jiffies = 0;
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return freq_next;
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}
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cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next,
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relation, &index);
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freq_req = dbs_info->freq_table[index].frequency;
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freq_reduc = freq_req * od_tuners->powersave_bias / 1000;
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freq_avg = freq_req - freq_reduc;
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/* Find freq bounds for freq_avg in freq_table */
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index = 0;
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cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
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CPUFREQ_RELATION_H, &index);
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freq_lo = dbs_info->freq_table[index].frequency;
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index = 0;
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cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
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CPUFREQ_RELATION_L, &index);
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freq_hi = dbs_info->freq_table[index].frequency;
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/* Find out how long we have to be in hi and lo freqs */
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if (freq_hi == freq_lo) {
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dbs_info->freq_lo = 0;
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dbs_info->freq_lo_jiffies = 0;
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return freq_lo;
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}
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jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate);
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jiffies_hi = (freq_avg - freq_lo) * jiffies_total;
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jiffies_hi += ((freq_hi - freq_lo) / 2);
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jiffies_hi /= (freq_hi - freq_lo);
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jiffies_lo = jiffies_total - jiffies_hi;
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dbs_info->freq_lo = freq_lo;
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dbs_info->freq_lo_jiffies = jiffies_lo;
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dbs_info->freq_hi_jiffies = jiffies_hi;
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return freq_hi;
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}
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static void ondemand_powersave_bias_init(void)
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{
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int i;
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for_each_online_cpu(i) {
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ondemand_powersave_bias_init_cpu(i);
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}
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}
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static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq)
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{
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struct dbs_data *dbs_data = policy->governor_data;
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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if (od_tuners->powersave_bias)
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freq = od_ops.powersave_bias_target(policy, freq,
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CPUFREQ_RELATION_H);
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else if (policy->cur == policy->max)
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return;
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__cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ?
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CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
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}
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/*
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* Every sampling_rate, we check, if current idle time is less than 20%
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* (default), then we try to increase frequency. Else, we adjust the frequency
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* proportional to load.
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*/
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static void od_check_cpu(int cpu, unsigned int load)
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{
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struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
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struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy;
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struct dbs_data *dbs_data = policy->governor_data;
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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dbs_info->freq_lo = 0;
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/* Check for frequency increase */
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if (load > od_tuners->up_threshold) {
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/* If switching to max speed, apply sampling_down_factor */
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if (policy->cur < policy->max)
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dbs_info->rate_mult =
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od_tuners->sampling_down_factor;
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dbs_freq_increase(policy, policy->max);
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} else {
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/* Calculate the next frequency proportional to load */
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unsigned int freq_next, min_f, max_f;
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min_f = policy->cpuinfo.min_freq;
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max_f = policy->cpuinfo.max_freq;
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freq_next = min_f + load * (max_f - min_f) / 100;
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/* No longer fully busy, reset rate_mult */
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dbs_info->rate_mult = 1;
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if (!od_tuners->powersave_bias) {
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__cpufreq_driver_target(policy, freq_next,
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CPUFREQ_RELATION_C);
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return;
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}
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freq_next = od_ops.powersave_bias_target(policy, freq_next,
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CPUFREQ_RELATION_L);
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__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C);
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}
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}
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static unsigned int od_dbs_timer(struct cpufreq_policy *policy, bool modify_all)
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{
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struct dbs_data *dbs_data = policy->governor_data;
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unsigned int cpu = policy->cpu;
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struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
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cpu);
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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int delay = 0, sample_type = dbs_info->sample_type;
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if (!modify_all)
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goto max_delay;
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/* Common NORMAL_SAMPLE setup */
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dbs_info->sample_type = OD_NORMAL_SAMPLE;
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if (sample_type == OD_SUB_SAMPLE) {
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delay = dbs_info->freq_lo_jiffies;
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__cpufreq_driver_target(policy, dbs_info->freq_lo,
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CPUFREQ_RELATION_H);
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} else {
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dbs_check_cpu(dbs_data, cpu);
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if (dbs_info->freq_lo) {
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/* Setup timer for SUB_SAMPLE */
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dbs_info->sample_type = OD_SUB_SAMPLE;
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delay = dbs_info->freq_hi_jiffies;
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}
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}
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max_delay:
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if (!delay)
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delay = delay_for_sampling_rate(od_tuners->sampling_rate
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* dbs_info->rate_mult);
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return delay;
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}
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/************************** sysfs interface ************************/
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static struct common_dbs_data od_dbs_cdata;
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/**
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* update_sampling_rate - update sampling rate effective immediately if needed.
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* @new_rate: new sampling rate
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*
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* If new rate is smaller than the old, simply updating
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* dbs_tuners_int.sampling_rate might not be appropriate. For example, if the
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* original sampling_rate was 1 second and the requested new sampling rate is 10
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* ms because the user needs immediate reaction from ondemand governor, but not
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* sure if higher frequency will be required or not, then, the governor may
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* change the sampling rate too late; up to 1 second later. Thus, if we are
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* reducing the sampling rate, we need to make the new value effective
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* immediately.
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*/
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static void update_sampling_rate(struct dbs_data *dbs_data,
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unsigned int new_rate)
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{
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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struct cpumask cpumask;
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int cpu;
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od_tuners->sampling_rate = new_rate = max(new_rate,
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dbs_data->min_sampling_rate);
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/*
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* Lock governor so that governor start/stop can't execute in parallel.
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*/
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mutex_lock(&od_dbs_cdata.mutex);
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cpumask_copy(&cpumask, cpu_online_mask);
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for_each_cpu(cpu, &cpumask) {
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struct cpufreq_policy *policy;
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struct od_cpu_dbs_info_s *dbs_info;
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struct cpu_dbs_info *cdbs;
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struct cpu_common_dbs_info *shared;
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unsigned long next_sampling, appointed_at;
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dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
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cdbs = &dbs_info->cdbs;
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shared = cdbs->shared;
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/*
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* A valid shared and shared->policy means governor hasn't
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* stopped or exited yet.
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*/
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if (!shared || !shared->policy)
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continue;
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policy = shared->policy;
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/* clear all CPUs of this policy */
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cpumask_andnot(&cpumask, &cpumask, policy->cpus);
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/*
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* Update sampling rate for CPUs whose policy is governed by
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* dbs_data. In case of governor_per_policy, only a single
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* policy will be governed by dbs_data, otherwise there can be
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* multiple policies that are governed by the same dbs_data.
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*/
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if (dbs_data != policy->governor_data)
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continue;
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/*
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* Checking this for any CPU should be fine, timers for all of
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* them are scheduled together.
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*/
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next_sampling = jiffies + usecs_to_jiffies(new_rate);
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appointed_at = dbs_info->cdbs.timer.expires;
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if (time_before(next_sampling, appointed_at)) {
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gov_cancel_work(shared);
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gov_add_timers(policy, usecs_to_jiffies(new_rate));
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}
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}
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mutex_unlock(&od_dbs_cdata.mutex);
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}
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static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
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size_t count)
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{
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unsigned int input;
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int ret;
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ret = sscanf(buf, "%u", &input);
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if (ret != 1)
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return -EINVAL;
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update_sampling_rate(dbs_data, input);
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return count;
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}
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static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf,
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size_t count)
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{
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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unsigned int input;
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int ret;
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unsigned int j;
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ret = sscanf(buf, "%u", &input);
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if (ret != 1)
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return -EINVAL;
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od_tuners->io_is_busy = !!input;
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/* we need to re-evaluate prev_cpu_idle */
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for_each_online_cpu(j) {
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struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
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j);
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dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
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&dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
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}
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return count;
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}
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static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf,
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size_t count)
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{
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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unsigned int input;
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int ret;
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ret = sscanf(buf, "%u", &input);
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if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
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input < MIN_FREQUENCY_UP_THRESHOLD) {
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return -EINVAL;
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}
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od_tuners->up_threshold = input;
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return count;
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}
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static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data,
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const char *buf, size_t count)
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{
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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unsigned int input, j;
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int ret;
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ret = sscanf(buf, "%u", &input);
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if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
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return -EINVAL;
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od_tuners->sampling_down_factor = input;
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/* Reset down sampling multiplier in case it was active */
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for_each_online_cpu(j) {
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struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
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j);
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dbs_info->rate_mult = 1;
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}
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return count;
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}
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static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data,
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const char *buf, size_t count)
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{
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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unsigned int input;
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int ret;
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unsigned int j;
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ret = sscanf(buf, "%u", &input);
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if (ret != 1)
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return -EINVAL;
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if (input > 1)
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input = 1;
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if (input == od_tuners->ignore_nice_load) { /* nothing to do */
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return count;
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}
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od_tuners->ignore_nice_load = input;
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/* we need to re-evaluate prev_cpu_idle */
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for_each_online_cpu(j) {
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struct od_cpu_dbs_info_s *dbs_info;
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dbs_info = &per_cpu(od_cpu_dbs_info, j);
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dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
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&dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
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if (od_tuners->ignore_nice_load)
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dbs_info->cdbs.prev_cpu_nice =
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kcpustat_cpu(j).cpustat[CPUTIME_NICE];
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}
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return count;
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}
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static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf,
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size_t count)
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{
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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unsigned int input;
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int ret;
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ret = sscanf(buf, "%u", &input);
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if (ret != 1)
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return -EINVAL;
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if (input > 1000)
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input = 1000;
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od_tuners->powersave_bias = input;
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ondemand_powersave_bias_init();
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return count;
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}
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show_store_one(od, sampling_rate);
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show_store_one(od, io_is_busy);
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show_store_one(od, up_threshold);
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show_store_one(od, sampling_down_factor);
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show_store_one(od, ignore_nice_load);
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show_store_one(od, powersave_bias);
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declare_show_sampling_rate_min(od);
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gov_sys_pol_attr_rw(sampling_rate);
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gov_sys_pol_attr_rw(io_is_busy);
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gov_sys_pol_attr_rw(up_threshold);
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gov_sys_pol_attr_rw(sampling_down_factor);
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gov_sys_pol_attr_rw(ignore_nice_load);
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gov_sys_pol_attr_rw(powersave_bias);
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gov_sys_pol_attr_ro(sampling_rate_min);
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static struct attribute *dbs_attributes_gov_sys[] = {
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&sampling_rate_min_gov_sys.attr,
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&sampling_rate_gov_sys.attr,
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&up_threshold_gov_sys.attr,
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&sampling_down_factor_gov_sys.attr,
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&ignore_nice_load_gov_sys.attr,
|
|
&powersave_bias_gov_sys.attr,
|
|
&io_is_busy_gov_sys.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group od_attr_group_gov_sys = {
|
|
.attrs = dbs_attributes_gov_sys,
|
|
.name = "ondemand",
|
|
};
|
|
|
|
static struct attribute *dbs_attributes_gov_pol[] = {
|
|
&sampling_rate_min_gov_pol.attr,
|
|
&sampling_rate_gov_pol.attr,
|
|
&up_threshold_gov_pol.attr,
|
|
&sampling_down_factor_gov_pol.attr,
|
|
&ignore_nice_load_gov_pol.attr,
|
|
&powersave_bias_gov_pol.attr,
|
|
&io_is_busy_gov_pol.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group od_attr_group_gov_pol = {
|
|
.attrs = dbs_attributes_gov_pol,
|
|
.name = "ondemand",
|
|
};
|
|
|
|
/************************** sysfs end ************************/
|
|
|
|
static int od_init(struct dbs_data *dbs_data, bool notify)
|
|
{
|
|
struct od_dbs_tuners *tuners;
|
|
u64 idle_time;
|
|
int cpu;
|
|
|
|
tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
|
|
if (!tuners) {
|
|
pr_err("%s: kzalloc failed\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cpu = get_cpu();
|
|
idle_time = get_cpu_idle_time_us(cpu, NULL);
|
|
put_cpu();
|
|
if (idle_time != -1ULL) {
|
|
/* Idle micro accounting is supported. Use finer thresholds */
|
|
tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
|
|
/*
|
|
* In nohz/micro accounting case we set the minimum frequency
|
|
* not depending on HZ, but fixed (very low). The deferred
|
|
* timer might skip some samples if idle/sleeping as needed.
|
|
*/
|
|
dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
|
|
} else {
|
|
tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
|
|
|
|
/* For correct statistics, we need 10 ticks for each measure */
|
|
dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
|
|
jiffies_to_usecs(10);
|
|
}
|
|
|
|
tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
|
|
tuners->ignore_nice_load = 0;
|
|
tuners->powersave_bias = default_powersave_bias;
|
|
tuners->io_is_busy = should_io_be_busy();
|
|
|
|
dbs_data->tuners = tuners;
|
|
return 0;
|
|
}
|
|
|
|
static void od_exit(struct dbs_data *dbs_data, bool notify)
|
|
{
|
|
kfree(dbs_data->tuners);
|
|
}
|
|
|
|
define_get_cpu_dbs_routines(od_cpu_dbs_info);
|
|
|
|
static struct od_ops od_ops = {
|
|
.powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
|
|
.powersave_bias_target = generic_powersave_bias_target,
|
|
.freq_increase = dbs_freq_increase,
|
|
};
|
|
|
|
static struct common_dbs_data od_dbs_cdata = {
|
|
.governor = GOV_ONDEMAND,
|
|
.attr_group_gov_sys = &od_attr_group_gov_sys,
|
|
.attr_group_gov_pol = &od_attr_group_gov_pol,
|
|
.get_cpu_cdbs = get_cpu_cdbs,
|
|
.get_cpu_dbs_info_s = get_cpu_dbs_info_s,
|
|
.gov_dbs_timer = od_dbs_timer,
|
|
.gov_check_cpu = od_check_cpu,
|
|
.gov_ops = &od_ops,
|
|
.init = od_init,
|
|
.exit = od_exit,
|
|
.mutex = __MUTEX_INITIALIZER(od_dbs_cdata.mutex),
|
|
};
|
|
|
|
static void od_set_powersave_bias(unsigned int powersave_bias)
|
|
{
|
|
struct cpufreq_policy *policy;
|
|
struct dbs_data *dbs_data;
|
|
struct od_dbs_tuners *od_tuners;
|
|
unsigned int cpu;
|
|
cpumask_t done;
|
|
|
|
default_powersave_bias = powersave_bias;
|
|
cpumask_clear(&done);
|
|
|
|
get_online_cpus();
|
|
for_each_online_cpu(cpu) {
|
|
struct cpu_common_dbs_info *shared;
|
|
|
|
if (cpumask_test_cpu(cpu, &done))
|
|
continue;
|
|
|
|
shared = per_cpu(od_cpu_dbs_info, cpu).cdbs.shared;
|
|
if (!shared)
|
|
continue;
|
|
|
|
policy = shared->policy;
|
|
cpumask_or(&done, &done, policy->cpus);
|
|
|
|
if (policy->governor != &cpufreq_gov_ondemand)
|
|
continue;
|
|
|
|
dbs_data = policy->governor_data;
|
|
od_tuners = dbs_data->tuners;
|
|
od_tuners->powersave_bias = default_powersave_bias;
|
|
}
|
|
put_online_cpus();
|
|
}
|
|
|
|
void od_register_powersave_bias_handler(unsigned int (*f)
|
|
(struct cpufreq_policy *, unsigned int, unsigned int),
|
|
unsigned int powersave_bias)
|
|
{
|
|
od_ops.powersave_bias_target = f;
|
|
od_set_powersave_bias(powersave_bias);
|
|
}
|
|
EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);
|
|
|
|
void od_unregister_powersave_bias_handler(void)
|
|
{
|
|
od_ops.powersave_bias_target = generic_powersave_bias_target;
|
|
od_set_powersave_bias(0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
|
|
|
|
static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
|
|
unsigned int event)
|
|
{
|
|
return cpufreq_governor_dbs(policy, &od_dbs_cdata, event);
|
|
}
|
|
|
|
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
|
|
static
|
|
#endif
|
|
struct cpufreq_governor cpufreq_gov_ondemand = {
|
|
.name = "ondemand",
|
|
.governor = od_cpufreq_governor_dbs,
|
|
.max_transition_latency = TRANSITION_LATENCY_LIMIT,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init cpufreq_gov_dbs_init(void)
|
|
{
|
|
return cpufreq_register_governor(&cpufreq_gov_ondemand);
|
|
}
|
|
|
|
static void __exit cpufreq_gov_dbs_exit(void)
|
|
{
|
|
cpufreq_unregister_governor(&cpufreq_gov_ondemand);
|
|
}
|
|
|
|
MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
|
|
MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
|
|
MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for "
|
|
"Low Latency Frequency Transition capable processors");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
|
|
fs_initcall(cpufreq_gov_dbs_init);
|
|
#else
|
|
module_init(cpufreq_gov_dbs_init);
|
|
#endif
|
|
module_exit(cpufreq_gov_dbs_exit);
|