113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <err.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <time.h>
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#include <sys/sched.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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/* define the policy to auto or manual */
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void set_policy(const char* policy) {
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int mib[2];
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size_t len;
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mib[0] = CTL_HW;
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mib[1] = HW_PERFPOLICY;
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len = sizeof(policy);
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if (sysctl(mib, 2, NULL, 0, policy, len) == -1)
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err(1, "sysctl");
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}
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/* restore policy auto upon exit */
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void quit_gracefully() {
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set_policy("auto");
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exit(0);
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}
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int main() {
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int mib_perf[2];
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int mib_powerplug[2];
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int mib_load[2];
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long cpu[CPUSTATES], cpu_previous[CPUSTATES];
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int frequency;
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int value;
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int cpu_usage_total = 0, cpu_usage;
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size_t len, len_cpu;
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mib_perf[0] = CTL_HW;
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mib_perf[1] = HW_SETPERF;
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mib_powerplug[0] = CTL_HW;
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mib_powerplug[1] = HW_POWER;
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mib_load[0] = CTL_KERN;
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mib_load[1] = KERN_CPTIME;
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len = sizeof(value);
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len_cpu = sizeof(cpu);
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signal(SIGINT, quit_gracefully);
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set_policy("manual");
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// avoid weird reading for first delta
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if (sysctl(mib_load, 2, &cpu_previous, &len_cpu, NULL, 0) == -1)
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err(1, "sysctl");
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/* main loop */
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for(;;) {
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// get if using power plug or not
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if (sysctl(mib_powerplug, 2, &value, &len, NULL, 0) == -1)
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err(1, "sysctl");
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printf("power: %i |", value);
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// get current frequency
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if (sysctl(mib_perf, 2, &value, &len, NULL, 0) == -1)
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err(1, "sysctl");
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printf("perf: %3i |", frequency);
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// get where the CPU time is spent, last field is IDLE
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if (sysctl(mib_load, 2, &cpu, &len_cpu, NULL, 0) == -1)
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err(1, "sysctl");
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// calculate delta between old and last cpu readings
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cpu_usage = cpu[0]-cpu_previous[0] +
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cpu[1]-cpu_previous[1] +
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cpu[2]-cpu_previous[2] +
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cpu[3]-cpu_previous[3] +
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cpu[4]-cpu_previous[4];
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if(cpu_usage == 0)
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cpu_usage_total = 0;
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else
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cpu_usage_total = 100-((cpu[5]-cpu_previous[5])-cpu_usage);
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memcpy(cpu_previous, cpu, sizeof(cpu));
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printf("usage: %3i%% |", cpu_usage_total);
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// change frequency
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len = sizeof(frequency);
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if(cpu_usage_total > 30) {
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if(frequency < 100)
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frequency = frequency + 10;
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if (sysctl(mib_perf, 2, NULL, 0, &frequency, len) == -1)
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err(1, "sysctl");
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}
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else {
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frequency = 0;
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if (sysctl(mib_perf, 2, NULL, 0, &frequency, len) == -1)
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err(1, "sysctl");
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}
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printf("new freq: %3i |", frequency);
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printf("\n");
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usleep(1000*300);
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}
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return(0);
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}
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