Return to dvs.c CVS log

Up to [local] / prex-old / usr / test / dvs

Annotation of prex-old/usr/test/dvs/dvs.c, Revision 1.1.1.1

1.1       nbrk        1: /*-
                      2:  * Copyright (c) 2005-2007, Kohsuke Ohtani
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. Neither the name of the author nor the names of any co-contributors
                     14:  *    may be used to endorse or promote products derived from this software
                     15:  *    without specific prior written permission.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  */
                     29:
                     30: /*
                     31:  * dvs.c - test DVS (dynamic voltage scaling).
                     32:  */
                     33:
                     34: /*
                     35:  * This program changes the CPU load periodically. Since the DVS driver
                     36:  * is polling the CPU load, the driver will change the CPU voltage/freqency
                     37:  * automatically when CPU becomes idle state.
                     38:  *
                     39:  * It is recommended to run CPU voltage monitor 'cpumon' with this program.
                     40:  */
                     41:
                     42: #include <prex/prex.h>
                     43: #include <stdio.h>
                     44:
                     45: static void
                     46: set_0_or_100(void)
                     47: {
                     48:        u_long t1, t2;
                     49:        char index[] = "-\\|/";
                     50:        char bar[] = "*\033[1D";
                     51:        int i, cnt;
                     52:
                     53:        i = 0;
                     54:        for (cnt = 0; cnt < 2; cnt++) {
                     55:                /*
                     56:                 * Display indicator for 5 sec.
                     57:                 */
                     58:                printf("\rCPU Busy:");
                     59:                sys_time(&t1);
                     60:                for (;;) {
                     61:                        sys_time(&t2);
                     62:                        if (t2 > t1 + 5000)
                     63:                                break;
                     64:                        /*
                     65:                         * Update indicator per 100 msec.
                     66:                         */
                     67:                        if ((t2 % 100) == 0) {
                     68:                                bar[0] = index[i++ % 4];
                     69:                                printf(bar);
                     70:                        }
                     71:                }
                     72:                /*
                     73:                 * Sleep 5 sec.
                     74:                 */
                     75:                printf("\rCPU Idle  ");
                     76:                timer_sleep(5000, 0);
                     77:        }
                     78: }
                     79:
                     80: static void
                     81: set_50(void)
                     82: {
                     83:        u_long t1, t2;
                     84:        char index[] = "-\\|/";
                     85:        char bar[] = "*\033[1D";
                     86:        int i, cnt;
                     87:
                     88:        printf("\rCPU half speed:");
                     89:        i = 0;
                     90:        for (cnt = 0; cnt < 5000; cnt++) {
                     91:                /*
                     92:                 * Update indicator per 100 msec.
                     93:                 */
                     94:                if ((t2 % 100) == 0) {
                     95:                        bar[0] = index[i++ % 4];
                     96:                        printf(bar);
                     97:                }
                     98:                sys_time(&t1);
                     99:                for (;;) {
                    100:                        sys_time(&t2);
                    101:                        if (t2 > t1 + 1)
                    102:                                break;
                    103:                }
                    104:                /*
                    105:                 * Sleep 1msec.
                    106:                 */
                    107:                timer_sleep(1, 0);
                    108:        }
                    109: }
                    110:
                    111: int
                    112: main(int argc, char *argv[])
                    113: {
                    114:        thread_yield();
                    115:
                    116:        printf("DVS test program\n");
                    117:
                    118:        for (;;) {
                    119:                set_0_or_100();
                    120:                set_50();
                    121:        }
                    122:        return 0;
                    123: }