![Thomas Renninger](/assets/img/avatar_default.png)
By taking error values of: sysfs_get_idlestate_count(..); into account. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
197 lines
4.5 KiB
C
197 lines
4.5 KiB
C
/*
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* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc
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*
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* Licensed under the terms of the GNU GPL License version 2.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <limits.h>
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#include "helpers/sysfs.h"
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#include "helpers/helpers.h"
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#include "idle_monitor/cpupower-monitor.h"
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#define CPUIDLE_STATES_MAX 10
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static cstate_t cpuidle_cstates[CPUIDLE_STATES_MAX];
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struct cpuidle_monitor cpuidle_sysfs_monitor;
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static unsigned long long **previous_count;
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static unsigned long long **current_count;
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struct timespec start_time;
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static unsigned long long timediff;
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static int cpuidle_get_count_percent(unsigned int id, double *percent,
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unsigned int cpu)
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{
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unsigned long long statediff = current_count[cpu][id]
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- previous_count[cpu][id];
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dprint("%s: - diff: %llu - percent: %f (%u)\n",
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cpuidle_cstates[id].name, timediff, *percent, cpu);
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if (timediff == 0)
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*percent = 0.0;
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else
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*percent = ((100.0 * statediff) / timediff);
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dprint("%s: - timediff: %llu - statediff: %llu - percent: %f (%u)\n",
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cpuidle_cstates[id].name, timediff, statediff, *percent, cpu);
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return 0;
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}
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static int cpuidle_start(void)
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{
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int cpu, state;
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clock_gettime(CLOCK_REALTIME, &start_time);
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for (cpu = 0; cpu < cpu_count; cpu++) {
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for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
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state++) {
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previous_count[cpu][state] =
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sysfs_get_idlestate_time(cpu, state);
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dprint("CPU %d - State: %d - Val: %llu\n",
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cpu, state, previous_count[cpu][state]);
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}
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};
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return 0;
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}
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static int cpuidle_stop(void)
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{
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int cpu, state;
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struct timespec end_time;
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clock_gettime(CLOCK_REALTIME, &end_time);
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timediff = timespec_diff_us(start_time, end_time);
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for (cpu = 0; cpu < cpu_count; cpu++) {
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for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
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state++) {
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current_count[cpu][state] =
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sysfs_get_idlestate_time(cpu, state);
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dprint("CPU %d - State: %d - Val: %llu\n",
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cpu, state, previous_count[cpu][state]);
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}
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};
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return 0;
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}
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void fix_up_intel_idle_driver_name(char *tmp, int num)
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{
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/* fix up cpuidle name for intel idle driver */
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if (!strncmp(tmp, "NHM-", 4)) {
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switch (num) {
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case 1:
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strcpy(tmp, "C1");
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break;
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case 2:
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strcpy(tmp, "C3");
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break;
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case 3:
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strcpy(tmp, "C6");
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break;
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}
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} else if (!strncmp(tmp, "SNB-", 4)) {
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switch (num) {
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case 1:
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strcpy(tmp, "C1");
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break;
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case 2:
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strcpy(tmp, "C3");
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break;
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case 3:
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strcpy(tmp, "C6");
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break;
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case 4:
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strcpy(tmp, "C7");
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break;
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}
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} else if (!strncmp(tmp, "ATM-", 4)) {
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switch (num) {
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case 1:
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strcpy(tmp, "C1");
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break;
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case 2:
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strcpy(tmp, "C2");
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break;
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case 3:
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strcpy(tmp, "C4");
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break;
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case 4:
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strcpy(tmp, "C6");
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break;
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}
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}
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}
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static struct cpuidle_monitor *cpuidle_register(void)
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{
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int num;
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char *tmp;
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/* Assume idle state count is the same for all CPUs */
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cpuidle_sysfs_monitor.hw_states_num = sysfs_get_idlestate_count(0);
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if (cpuidle_sysfs_monitor.hw_states_num <= 0)
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return NULL;
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for (num = 0; num < cpuidle_sysfs_monitor.hw_states_num; num++) {
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tmp = sysfs_get_idlestate_name(0, num);
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if (tmp == NULL)
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continue;
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fix_up_intel_idle_driver_name(tmp, num);
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strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
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free(tmp);
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tmp = sysfs_get_idlestate_desc(0, num);
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if (tmp == NULL)
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continue;
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strncpy(cpuidle_cstates[num].desc, tmp, CSTATE_DESC_LEN - 1);
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free(tmp);
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cpuidle_cstates[num].range = RANGE_THREAD;
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cpuidle_cstates[num].id = num;
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cpuidle_cstates[num].get_count_percent =
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cpuidle_get_count_percent;
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};
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/* Free this at program termination */
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previous_count = malloc(sizeof(long long *) * cpu_count);
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current_count = malloc(sizeof(long long *) * cpu_count);
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for (num = 0; num < cpu_count; num++) {
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previous_count[num] = malloc(sizeof(long long) *
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cpuidle_sysfs_monitor.hw_states_num);
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current_count[num] = malloc(sizeof(long long) *
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cpuidle_sysfs_monitor.hw_states_num);
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}
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cpuidle_sysfs_monitor.name_len = strlen(cpuidle_sysfs_monitor.name);
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return &cpuidle_sysfs_monitor;
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}
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void cpuidle_unregister(void)
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{
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int num;
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for (num = 0; num < cpu_count; num++) {
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free(previous_count[num]);
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free(current_count[num]);
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}
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free(previous_count);
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free(current_count);
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}
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struct cpuidle_monitor cpuidle_sysfs_monitor = {
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.name = "Idle_Stats",
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.hw_states = cpuidle_cstates,
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.start = cpuidle_start,
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.stop = cpuidle_stop,
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.do_register = cpuidle_register,
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.unregister = cpuidle_unregister,
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.needs_root = 0,
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.overflow_s = UINT_MAX,
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};
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