1 /******************************************************************************/ 2 /* */ 3 /* Copyright (c) International Business Machines Corp., 2007 */ 4 /* */ 5 /* This program is free software; you can redistribute it and/or modify */ 6 /* it under the terms of the GNU General Public License as published by */ 7 /* the Free Software Foundation; either version 2 of the License, or */ 8 /* (at your option) any later version. */ 9 /* */ 10 /* This program is distributed in the hope that it will be useful, */ 11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ 13 /* the GNU General Public License for more details. */ 14 /* */ 15 /* You should have received a copy of the GNU General Public License */ 16 /* along with this program; if not, write to the Free Software */ 17 /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ 18 /* */ 19 /******************************************************************************/ 20 21 /******************************************************************************/ 22 /* */ 23 /* File: cpuctl_task_def01.c */ 24 /* */ 25 /* Description: This is a c program that runs as a default task in a default */ 26 /* group to create an ideal scenario. In this default group all */ 27 /* the system tasks will be running along with this spinning task*/ 28 /* The file is to be used by tests 1-3. */ 29 /* */ 30 /* Total Tests: 1 */ 31 /* */ 32 /* Test Name: cpu_controller_tests */ 33 /* */ 34 /* Test Assertion */ 35 /* Please refer to the file cpuctl_testplan.txt */ 36 /* */ 37 /* Author: Sudhir Kumar skumar (at) linux.vnet.ibm.com */ 38 /* */ 39 /* History: */ 40 /* Created- 14/11/2008 -Sudhir Kumar <skumar (at) linux.vnet.ibm.com> */ 41 /* */ 42 /******************************************************************************/ 43 44 #include <unistd.h> 45 #include <math.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <sys/resource.h> 51 #include <sys/syscall.h> 52 #include <sys/time.h> 53 #include <sys/types.h> 54 #include <sys/stat.h> 55 #include <fcntl.h> 56 #include <time.h> 57 58 #include "../libcontrollers/libcontrollers.h" 59 #include "test.h" /* LTP harness APIs */ 60 61 #ifdef DEBUG 62 #define dbg(x...) printf(x); 63 #else 64 #define dbg(x...) do {} while (0) 65 #endif 66 67 #define TIME_INTERVAL 30 /* Time interval in seconds */ 68 #define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */ 69 #define NUM_SETS 4 /* How many share values (with same ratio) */ 70 #define MULTIPLIER 10 /* Rate at which share value gets multiplied */ 71 72 char *TCID = "cpu_controller_tests"; 73 int TST_TOTAL = 1; 74 pid_t scriptpid; 75 char path[FILENAME_MAX] = "/dev/cpuctl"; 76 77 extern void cleanup(void) 78 { 79 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ 80 /* Report exit status */ 81 } 82 83 volatile int timer_expired = 0; 84 85 int main(int argc, char *argv[]) 86 { 87 88 int num_cpus, test_num, len; /* Total time = TIME_INTERVAL*num_cpus */ 89 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; 90 char mysharesfile[FILENAME_MAX], ch; 91 pid_t pid; 92 int my_group_num; /* A number attached with a group */ 93 int fd; /* To open a fifo for synchronization */ 94 int first_counter = 0; /* To take n number of readings */ 95 int second_counter = 0; /* no of times shares have changed */ 96 double total_cpu_time; /* Accumulated cpu time */ 97 double delta_cpu_time; /* Time the task could run on cpu(s) */ 98 double prev_cpu_time = 0; 99 double exp_cpu_time; /* Exp time in % by shares calculation */ 100 struct rusage cpu_usage; 101 time_t current_time, prev_time, delta_time; 102 unsigned long int myshares = 2, baseshares = 1000; 103 unsigned int fmyshares, num_tasks; 104 struct sigaction newaction, oldaction; 105 106 num_cpus = 0; 107 test_num = 0; 108 my_group_num = -1; 109 110 /* Signal handling for alarm */ 111 sigemptyset(&newaction.sa_mask); 112 newaction.sa_handler = signal_handler_alarm; 113 newaction.sa_flags = 0; 114 sigaction(SIGALRM, &newaction, &oldaction); 115 116 /* Check if all parameters passed are correct */ 117 if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) || 118 ((scriptpid = atoi(argv[3])) <= 0) || 119 ((num_cpus = atoi(argv[4])) <= 0) || 120 (test_num = atoi(argv[5])) <= 0) 121 tst_brkm(TBROK, cleanup, "Invalid input parameters\n"); 122 123 if (test_num == 1) 124 myshares *= my_group_num; 125 else if (test_num == 3) 126 myshares = baseshares; 127 else 128 tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.\n"); 129 130 sprintf(mygroup, "%s", argv[2]); 131 sprintf(mytaskfile, "%s", mygroup); 132 sprintf(mysharesfile, "%s", mygroup); 133 strcat(mytaskfile, "/tasks"); 134 strcat(mysharesfile, "/cpu.shares"); 135 pid = getpid(); 136 write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */ 137 write_to_file(mysharesfile, "w", myshares); 138 dbg("Default task's initial shares = %u", myshares); 139 140 fd = open("./myfifo", 0); 141 if (fd == -1) 142 tst_brkm(TBROK, cleanup, "Could not open fifo to synchronizae"); 143 144 read(fd, &ch, 1); /* To fire all the tasks up at the same time */ 145 146 /* 147 * We need not calculate the expected % cpu time of this task, as 148 * neither it is required nor it can be predicted as there are idle 149 * system tasks (and others too) in this group. 150 */ 151 FLAG = 0; 152 total_shares = 0; 153 shares_pointer = &total_shares; 154 len = strlen(path); 155 if (!strncpy(fullpath, path, len)) 156 tst_brkm(TBROK, cleanup, 157 "Could not copy directory path %s ", path); 158 159 if (scan_shares_files(shares_pointer) != 0) 160 tst_brkm(TBROK, cleanup, 161 "From function scan_shares_files in %s ", fullpath); 162 163 /* return val -1 in case of function error, else 2 is min share value */ 164 if ((fmyshares = read_shares_file(mysharesfile)) < 2) 165 tst_brkm(TBROK, cleanup, 166 "in reading shares files %s ", mysharesfile); 167 168 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 169 tst_brkm(TBROK, cleanup, 170 "in reading tasks files %s ", mytaskfile); 171 172 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); 173 174 prev_time = time(NULL); /* Note down the time */ 175 176 while (1) { 177 /* 178 * Need to run some cpu intensive task, which also 179 * frequently checks the timer value 180 */ 181 double f = 274.345, mytime; /*just a float number for sqrt */ 182 alarm(TIME_INTERVAL); 183 timer_expired = 0; 184 /* 185 * Let the task run on cpu for TIME_INTERVAL. Time of this 186 * operation should not be high otherwise we can exceed the 187 * TIME_INTERVAL to measure cpu usage 188 */ 189 while (!timer_expired) 190 f = sqrt(f * f); 191 192 current_time = time(NULL); 193 /* Duration in case its not exact TIME_INTERVAL */ 194 delta_time = current_time - prev_time; 195 196 getrusage(0, &cpu_usage); 197 /* total_cpu_time = total user time + total sys time */ 198 total_cpu_time = (cpu_usage.ru_utime.tv_sec + 199 cpu_usage.ru_utime.tv_usec * 1e-6 + 200 cpu_usage.ru_stime.tv_sec + 201 cpu_usage.ru_stime.tv_usec * 1e-6); 202 delta_cpu_time = total_cpu_time - prev_cpu_time; 203 204 prev_cpu_time = total_cpu_time; 205 prev_time = current_time; 206 207 /* calculate % cpu time each task gets */ 208 if (delta_time > TIME_INTERVAL) 209 mytime = (delta_cpu_time * 100) / 210 (delta_time * num_cpus); 211 else 212 mytime = (delta_cpu_time * 100) / 213 (TIME_INTERVAL * num_cpus); 214 215 /* 216 * Lets print the results. The exp cpu time calculated may not 217 * be correct due to running system tasks at the moment 218 */ 219 fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)" 220 " i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)" 221 " in %lu (s) INTERVAL\n", delta_cpu_time, mytime, 222 exp_cpu_time, myshares, delta_time); 223 first_counter++; 224 225 /* Take n sets of readings for each shares value */ 226 if (first_counter >= NUM_INTERVALS) { 227 first_counter = 0; 228 second_counter++; 229 if (second_counter >= NUM_SETS) 230 exit(0); /* This task is done */ 231 232 /* Keep same ratio but change values */ 233 if (test_num == 1) { 234 myshares = MULTIPLIER * myshares; 235 write_to_file(mysharesfile, "w", myshares); 236 } 237 /* No need to change shares for def task for test 3 */ 238 239 } /* end if */ 240 } /* end while */ 241 } /* end main */ 242
