95f9881ff8
git-svn-id: https://irqbalance.googlecode.com/svn/trunk@2 46b42954-3823-0410-bd82-eb80b452c9b5
76 lines
2 KiB
C
76 lines
2 KiB
C
/*
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* Copyright (C) 2006, Intel Corporation
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*
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* This file is part of irqbalance
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*
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* This program file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program in a file named COPYING; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include "irqbalance.h"
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extern int power_mode;
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static uint64_t previous;
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static unsigned int hysteresis;
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void check_power_mode(void)
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{
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FILE *file;
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char line[4096];
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char *c;
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uint64_t dummy, irq, softirq;
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line[0]=0;
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line[4095]=0;
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file = fopen("/proc/stat", "r");
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if (!file)
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return;
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if (fgets(line, 4095, file)==NULL)
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memset(line,0, 4096);
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fclose(file);
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c=&line[4];
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dummy = strtoull(c, &c, 10); /* user */
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dummy = strtoull(c, &c, 10); /* nice */
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dummy = strtoull(c, &c, 10); /* system */
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dummy = strtoull(c, &c, 10); /* idle */
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dummy = strtoull(c, &c, 10); /* iowait */
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irq = strtoull(c, &c, 10); /* irq */
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softirq = strtoull(c, &c, 10); /* softirq */
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irq += softirq;
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if (irq - previous < POWER_MODE_SOFTIRQ_THRESHOLD) {
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hysteresis++;
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if (hysteresis > POWER_MODE_HYSTERESIS) {
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if (debug_mode && !power_mode)
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printf("IRQ delta is %lu, switching to power mode \n", (unsigned long)(irq - previous) );
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power_mode = 1;
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}
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} else {
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if (debug_mode && power_mode)
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printf("IRQ delta is %lu, switching to performance mode \n", (unsigned long)(irq - previous) );
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power_mode = 0;
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hysteresis = 0;
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}
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previous = irq;
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}
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