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_def04.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 9-10. */ 29 /* */ 30 /* Total Tests: 2 */ 31 /* */ 32 /* Test 09: Heavy stress test with nice value change */ 33 /* Test 10: Heavy stress test (effect of heavy group on light group) */ 34 /* */ 35 /* Test Name: cpu_controller_test 9,10 */ 36 /* */ 37 /* Test Assertion */ 38 /* Please refer to the file cpuctl_testplan.txt */ 39 /* */ 40 /* Author: Sudhir Kumar skumar (at) linux.vnet.ibm.com */ 41 /* */ 42 /* History: */ 43 /* Created- 20/11/2008 -Sudhir Kumar <skumar (at) linux.vnet.ibm.com> */ 44 /* */ 45 /******************************************************************************/ 46 47 #include <unistd.h> 48 #include <math.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <sys/resource.h> 54 #include <sys/syscall.h> 55 #include <sys/stat.h> 56 #include <fcntl.h> 57 #include <sys/time.h> 58 #include <sys/types.h> 59 #include <time.h> 60 #include <unistd.h> 61 62 #include "../libcontrollers/libcontrollers.h" 63 #include "test.h" /* LTP harness APIs */ 64 65 #define TIME_INTERVAL 100 /* 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 = 2; 70 pid_t scriptpid; 71 char path[] = "/dev/cpuctl"; 72 extern void cleanup() 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; 84 int task_num; 85 int len; 86 int num_cpus; 87 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; 88 char mysharesfile[FILENAME_MAX], ch; 89 /* Following variables are to capture parameters from script */ 90 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p; 91 char *test_num_p, *task_num_p; 92 gid_t mygroup_num; /* A number attached with a group */ 93 int fd; /* to open a fifo to synchronize */ 94 int counter = 0; /* To take n number of readings */ 95 double total_cpu_time; /* Accumulated cpu time */ 96 double delta_cpu_time; /* Time the task could run on cpu(s) */ 97 double prev_cpu_time = 0; 98 double exp_cpu_time; /* Exp time in % by shares calculation */ 99 100 struct rusage cpu_usage; 101 time_t current_time, prev_time, delta_time; 102 unsigned int fmyshares, num_tasks; 103 unsigned int mygroup_shares; 104 struct sigaction newaction, oldaction; 105 106 mygroup_num = -1; 107 num_cpus = 0; 108 task_num = 0; 109 test_num = 0; 110 111 /* Signal handling for alarm */ 112 sigemptyset(&newaction.sa_mask); 113 newaction.sa_handler = signal_handler_alarm; 114 newaction.sa_flags = 0; 115 sigaction(SIGALRM, &newaction, &oldaction); 116 117 /* Collect the parameters passed by the script */ 118 group_num_p = getenv("GROUP_NUM"); 119 mygroup_p = getenv("MYGROUP"); 120 script_pid_p = getenv("SCRIPT_PID"); 121 num_cpus_p = getenv("NUM_CPUS"); 122 test_num_p = getenv("TEST_NUM"); 123 task_num_p = getenv("TASK_NUM"); 124 /* Check if all of them are valid */ 125 if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 10) && 126 ((test_num = atoi(test_num_p)) >= 9))) { 127 if ((group_num_p != NULL) && (mygroup_p != NULL) && 128 (script_pid_p != NULL) && (num_cpus_p != NULL) && 129 (task_num_p != NULL)) { 130 mygroup_num = atoi(group_num_p); 131 scriptpid = atoi(script_pid_p); 132 num_cpus = atoi(num_cpus_p); 133 task_num = atoi(task_num_p); 134 sprintf(mygroup, "%s", mygroup_p); 135 } else { 136 tst_brkm(TBROK, cleanup, 137 "Invalid other input parameters\n"); 138 } 139 } else { 140 tst_brkm(TBROK, cleanup, "Invalid test number passed\n"); 141 } 142 143 sprintf(mytaskfile, "%s", mygroup); 144 sprintf(mysharesfile, "%s", mygroup); 145 strcat(mytaskfile, "/tasks"); 146 strcat(mysharesfile, "/cpu.shares"); 147 148 write_to_file(mytaskfile, "a", getpid()); 149 150 /* 151 * Let us give the default group 100 shares, as other groups will have 152 * a multiple of 100 shares. 153 */ 154 mygroup_shares = 100; 155 write_to_file(mysharesfile, "w", mygroup_shares); 156 157 fd = open("./myfifo", 0); 158 if (fd == -1) 159 tst_brkm(TBROK, cleanup, "Could not open fifo synchronize"); 160 161 read(fd, &ch, 1); /* Block task here to synchronize */ 162 163 /* 164 * We need not calculate the expected % cpu time of this task, as 165 * neither it is required nor it can be predicted as there are idle 166 * system tasks (and others too) in this group. 167 */ 168 FLAG = 0; 169 total_shares = 0; 170 shares_pointer = &total_shares; 171 len = strlen(path); 172 if (!strncpy(fullpath, path, len)) 173 tst_brkm(TBROK, cleanup, 174 "Could not copy directory path %s ", path); 175 176 if (scan_shares_files(shares_pointer) != 0) 177 tst_brkm(TBROK, cleanup, 178 "From function scan_shares_files in %s ", fullpath); 179 180 /* return val -1 in case of function error, else 2 is min share value */ 181 if ((fmyshares = read_shares_file(mysharesfile)) < 2) 182 tst_brkm(TBROK, cleanup, 183 "in reading shares files %s ", mysharesfile); 184 185 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 186 tst_brkm(TBROK, cleanup, 187 "in reading tasks files %s ", mytaskfile); 188 189 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); 190 191 prev_time = time(NULL); /* Note down the time */ 192 193 while (1) { 194 /* 195 * Need to run some cpu intensive task, which also 196 * frequently checks the timer value 197 */ 198 double f = 274.345, mytime; /*just a float number for sqrt */ 199 alarm(TIME_INTERVAL); 200 timer_expired = 0; 201 /* 202 * Let the task run on cpu for TIME_INTERVAL. Time of this 203 * operation should not be high otherwise we can exceed the 204 * TIME_INTERVAL to measure cpu usage 205 */ 206 while (!timer_expired) 207 f = sqrt(f * f); 208 209 current_time = time(NULL); 210 /* Duration in case its not exact TIME_INTERVAL */ 211 delta_time = current_time - prev_time; 212 213 getrusage(0, &cpu_usage); 214 /* total_cpu_time = total user time + total sys time */ 215 total_cpu_time = (cpu_usage.ru_utime.tv_sec + 216 cpu_usage.ru_utime.tv_usec * 1e-6 + 217 cpu_usage.ru_stime.tv_sec + 218 cpu_usage.ru_stime.tv_usec * 1e-6); 219 delta_cpu_time = total_cpu_time - prev_cpu_time; 220 221 prev_cpu_time = total_cpu_time; 222 prev_time = current_time; 223 224 /* calculate % cpu time each task gets */ 225 if (delta_time > TIME_INTERVAL) 226 mytime = (delta_cpu_time * 100) / 227 (delta_time * num_cpus); 228 else 229 mytime = (delta_cpu_time * 100) / 230 (TIME_INTERVAL * num_cpus); 231 232 /* No neeed to print the results */ 233 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s) i.e." 234 " %6.2f(%%) exp:-%6.2f(%%)} with %3u shares in %lu (s)" 235 " INTERVAL\n", mygroup_num, task_num, delta_cpu_time, 236 mytime, exp_cpu_time, fmyshares, delta_time); 237 238 counter++; 239 240 if (counter >= NUM_INTERVALS) { 241 switch (test_num) { 242 243 case 9: /* Test 09 */ 244 case 10: /* Test 10 */ 245 exit(0); /* This task is done */ 246 break; 247 default: 248 tst_brkm(TBROK, cleanup, 249 "Invalid test number passed\n"); 250 break; 251 252 } /* end switch */ 253 } /* end if */ 254 } /* end while */ 255 } /* end main */ 256
