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_def02.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 6-8. */ 29 /* */ 30 /* Total Tests: 3 */ 31 /* */ 32 /* Test 6: N X M (N groups with M tasks each) */ 33 /* Test 7: N*M X 1 (N*M groups with 1 task each) */ 34 /* Test 8: 1 X N*M (1 group with N*M tasks each) */ 35 /* */ 36 /* Test Name: cpu_controller_test 6,7,8 */ 37 /* */ 38 /* Test Assertion */ 39 /* Please refer to the file cpuctl_testplan.txt */ 40 /* */ 41 /* Author: Sudhir Kumar skumar (at) linux.vnet.ibm.com */ 42 /* */ 43 /* History: */ 44 /* Created- 20/11/2008 -Sudhir Kumar <skumar (at) linux.vnet.ibm.com> */ 45 /* */ 46 /******************************************************************************/ 47 48 #include <unistd.h> 49 #include <math.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <sys/resource.h> 55 #include <sys/syscall.h> 56 #include <sys/stat.h> 57 #include <fcntl.h> 58 #include <sys/time.h> 59 #include <sys/types.h> 60 #include <time.h> 61 62 #include "../libcontrollers/libcontrollers.h" 63 #include "test.h" /* LTP harness APIs */ 64 65 #define TIME_INTERVAL 30 /* Time interval in seconds */ 66 #define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */ 67 68 char *TCID = "cpu_controller_test06"; 69 int TST_TOTAL = 3; 70 pid_t scriptpid; 71 char path[] = "/dev/cpuctl"; 72 extern void cleanup(void) 73 { 74 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ 75 /* Report exit status */ 76 } 77 78 volatile int timer_expired = 0; 79 80 int main(int argc, char *argv[]) 81 { 82 83 int test_num, task_num, len, num_cpus; 84 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; 85 char mysharesfile[FILENAME_MAX], ch; 86 /* Following variables are to capture parameters from script */ 87 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p; 88 char *test_num_p, *task_num_p; 89 pid_t pid; 90 gid_t mygroup_num; /* A number attached with a group */ 91 int fd; /* to open a fifo to synchronize */ 92 int counter = 0; /* To take n number of readings */ 93 double total_cpu_time, /* Accumulated cpu time */ 94 delta_cpu_time, /* Time the task could run on cpu(s) */ 95 prev_cpu_time = 0; 96 double exp_cpu_time; /* Exp time in % by shares calculation */ 97 98 struct rusage cpu_usage; 99 time_t current_time, prev_time, delta_time; 100 unsigned int fmyshares, num_tasks; 101 struct sigaction newaction, oldaction; 102 103 mygroup_num = -1; 104 num_cpus = 0; 105 task_num = 0; 106 test_num = 0; 107 108 /* Signal handling for alarm */ 109 sigemptyset(&newaction.sa_mask); 110 newaction.sa_handler = signal_handler_alarm; 111 newaction.sa_flags = 0; 112 sigaction(SIGALRM, &newaction, &oldaction); 113 114 /* Collect the parameters passed by the script */ 115 group_num_p = getenv("GROUP_NUM"); 116 mygroup_p = getenv("MYGROUP"); 117 script_pid_p = getenv("SCRIPT_PID"); 118 num_cpus_p = getenv("NUM_CPUS"); 119 test_num_p = getenv("TEST_NUM"); 120 task_num_p = getenv("TASK_NUM"); 121 /* Check if all of them are valid */ 122 if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 8) && 123 ((test_num = atoi(test_num_p)) >= 6))) { 124 if ((group_num_p != NULL) && (mygroup_p != NULL) && 125 (script_pid_p != NULL) && (num_cpus_p != NULL) && 126 (task_num_p != NULL)) { 127 mygroup_num = atoi(group_num_p); 128 scriptpid = atoi(script_pid_p); 129 num_cpus = atoi(num_cpus_p); 130 task_num = atoi(task_num_p); 131 sprintf(mygroup, "%s", mygroup_p); 132 } else { 133 tst_brkm(TBROK, cleanup, 134 "Invalid other input parameters\n"); 135 } 136 } else { 137 tst_brkm(TBROK, cleanup, "Invalid test number passed\n"); 138 } 139 140 sprintf(mytaskfile, "%s", mygroup); 141 sprintf(mysharesfile, "%s", mygroup); 142 strcat(mytaskfile, "/tasks"); 143 strcat(mysharesfile, "/cpu.shares"); 144 pid = getpid(); 145 write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */ 146 147 fd = open("./myfifo", 0); 148 if (fd == -1) 149 tst_brkm(TBROK, cleanup, "Could not open fifo synchronize"); 150 151 read(fd, &ch, 1); /* Block task here to synchronize */ 152 153 /* 154 * We need not calculate the expected % cpu time of this task, as 155 * neither it is required nor it can be predicted as there are idle 156 * system tasks (and others too) in this group. 157 */ 158 FLAG = 0; 159 total_shares = 0; 160 shares_pointer = &total_shares; 161 len = strlen(path); 162 if (!strncpy(fullpath, path, len)) 163 tst_brkm(TBROK, cleanup, 164 "Could not copy directory path %s ", path); 165 166 if (scan_shares_files(shares_pointer) != 0) 167 tst_brkm(TBROK, cleanup, 168 "From function scan_shares_files in %s ", fullpath); 169 170 /* return val -1 in case of function error, else 2 is min share value */ 171 if ((fmyshares = read_shares_file(mysharesfile)) < 2) 172 tst_brkm(TBROK, cleanup, 173 "in reading shares files %s ", mysharesfile); 174 175 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 176 tst_brkm(TBROK, cleanup, 177 "in reading tasks files %s ", mytaskfile); 178 179 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); 180 181 prev_time = time(NULL); /* Note down the time */ 182 183 while (1) { 184 /* 185 * Need to run some cpu intensive task, which also 186 * frequently checks the timer value 187 */ 188 double f = 274.345, mytime; /*just a float number for sqrt */ 189 alarm(TIME_INTERVAL); 190 timer_expired = 0; 191 /* 192 * Let the task run on cpu for TIME_INTERVAL. Time of this 193 * operation should not be high otherwise we can exceed the 194 * TIME_INTERVAL to measure cpu usage 195 */ 196 while (!timer_expired) 197 f = sqrt(f * f); 198 199 current_time = time(NULL); 200 /* Duration in case its not exact TIME_INTERVAL */ 201 delta_time = current_time - prev_time; 202 203 getrusage(0, &cpu_usage); 204 /* total_cpu_time = total user time + total sys time */ 205 total_cpu_time = (cpu_usage.ru_utime.tv_sec + 206 cpu_usage.ru_utime.tv_usec * 1e-6 + 207 cpu_usage.ru_stime.tv_sec + 208 cpu_usage.ru_stime.tv_usec * 1e-6); 209 delta_cpu_time = total_cpu_time - prev_cpu_time; 210 211 prev_cpu_time = total_cpu_time; 212 prev_time = current_time; 213 214 /* calculate % cpu time each task gets */ 215 if (delta_time > TIME_INTERVAL) 216 mytime = (delta_cpu_time * 100) / 217 (delta_time * num_cpus); 218 else 219 mytime = (delta_cpu_time * 100) / 220 (TIME_INTERVAL * num_cpus); 221 222 /* No neeed to print the results */ 223 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)" 224 " i.e. %6.2f(%%) exp:-%6.2f(%%)} in %lu (s)\n", 225 mygroup_num, task_num, delta_cpu_time, mytime, 226 exp_cpu_time, delta_time); 227 228 counter++; 229 230 if (counter >= NUM_INTERVALS) { 231 switch (test_num) { 232 case 6: /* Test 06 */ 233 case 7: /* Test 07 */ 234 case 8: /* Test 08 */ 235 exit(0); /* This task is done */ 236 break; 237 default: 238 tst_brkm(TBROK, cleanup, 239 "Invalid test num passed\n"); 240 break; 241 242 } /* end switch */ 243 } /* end if */ 244 } /* end while */ 245 } /* end main */ 246
