8636fd280e
The function get_cpu_idle_time_jiffy in both the conservative and ondemand governors use jiffies_to_usecs to convert a cputime value to usecs which gives the wrong value on architectures where cputime and jiffies use different units. Only matters if NO_HZ is disabled, since otherwise get_cpu_idle_time_us should already return a valid value, and get_cpu_idle_time_jiffy isn't actually called. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
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* drivers/cpufreq/cpufreq_governor.c
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*
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* CPUFREQ governors common code
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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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#include <asm/cputime.h>
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#include <linux/export.h>
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#include <linux/kernel_stat.h>
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#include <linux/tick.h>
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#include <linux/types.h>
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/*
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* Code picked from earlier governer implementations
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*/
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static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
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{
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u64 idle_time;
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u64 cur_wall_time;
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u64 busy_time;
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cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
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busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
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busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
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busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
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busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
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busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
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busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
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idle_time = cur_wall_time - busy_time;
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if (wall)
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*wall = cputime_to_usecs(cur_wall_time);
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return cputime_to_usecs(idle_time);
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}
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cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
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{
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u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
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if (idle_time == -1ULL)
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return get_cpu_idle_time_jiffy(cpu, wall);
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else
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idle_time += get_cpu_iowait_time_us(cpu, wall);
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return idle_time;
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}
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EXPORT_SYMBOL_GPL(get_cpu_idle_time);
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