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_test02.c */ 24 /* */ 25 /* Description: This is a c program that tests the cpucontroller fairness of */ 26 /* scheduling the tasks according to their group shares. This */ 27 /* testcase tests the ability of the cpu controller to provide */ 28 /* fairness for share values (absolute). */ 29 /* */ 30 /* Total Tests: 2 */ 31 /* */ 32 /* Test 04: Nice value effect on group scheduling */ 33 /* Test 05: Task migration test */ 34 /* */ 35 /* Test Name: cpu_controller_test02 */ 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- 20/12/2007 -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/time.h> 56 #include <sys/types.h> 57 #include <sys/stat.h> 58 #include <fcntl.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 30 /* Time interval in seconds */ 66 #define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */ 67 68 char *TCID = "cpuctl_test02"; 69 int TST_TOTAL = 1; 70 pid_t scriptpid; 71 char path[] = "/dev/cpuctl"; 72 73 extern void cleanup() 74 { 75 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ 76 tst_exit(); /* Report exit status */ 77 } 78 79 int migrate_task(); 80 volatile int timer_expired = 0; 81 82 int main(int argc, char *argv[]) 83 { 84 85 int test_num; 86 int task_num; 87 int len; 88 int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */ 89 int migrate = 0; /* For task migration */ 90 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; 91 char mysharesfile[FILENAME_MAX], ch; 92 /* Following variables are to capture parameters from script */ 93 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p, 94 *task_num_p; 95 pid_t pid; 96 gid_t mygroup_num; /* A number attached with a group */ 97 int fd; /* A descriptor to open a fifo for synchronized start */ 98 int counter = 0; /* To take n number of readings */ 99 double total_cpu_time, /* Accumulated cpu time */ 100 delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */ 101 prev_cpu_time = 0; 102 double exp_cpu_time; /* Expected time in % as obtained by shares calculation */ 103 104 struct rusage cpu_usage; 105 time_t current_time, prev_time, delta_time; 106 unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */ 107 struct sigaction newaction, oldaction; 108 109 mygroup_num = -1; 110 num_cpus = 0; 111 task_num = 0; 112 test_num = 0; 113 114 /* Signal handling for alarm */ 115 sigemptyset(&newaction.sa_mask); 116 newaction.sa_handler = signal_handler_alarm; 117 newaction.sa_flags = 0; 118 sigaction(SIGALRM, &newaction, &oldaction); 119 120 /* Collect the parameters passed by the script */ 121 group_num_p = getenv("GROUP_NUM"); 122 mygroup_p = getenv("MYGROUP"); 123 script_pid_p = getenv("SCRIPT_PID"); 124 num_cpus_p = getenv("NUM_CPUS"); 125 test_num_p = getenv("TEST_NUM"); 126 task_num_p = getenv("TASK_NUM"); 127 /* Check if all of them are valid */ 128 if ((test_num_p != NULL) 129 && (((test_num = atoi(test_num_p)) == 4) 130 || ((test_num = atoi(test_num_p)) == 5))) { 131 if ((group_num_p != NULL) && (mygroup_p != NULL) 132 && (script_pid_p != NULL) && (num_cpus_p != NULL) 133 && (task_num_p != NULL)) { 134 mygroup_num = atoi(group_num_p); 135 scriptpid = atoi(script_pid_p); 136 num_cpus = atoi(num_cpus_p); 137 task_num = atoi(task_num_p); 138 sprintf(mygroup, "%s", mygroup_p); 139 } else { 140 tst_brkm(TBROK, cleanup, 141 "Invalid other input parameters\n"); 142 } 143 } else { 144 tst_brkm(TBROK, cleanup, "Invalid test number passed\n"); 145 } 146 147 sprintf(mytaskfile, "%s", mygroup); 148 sprintf(mysharesfile, "%s", mygroup); 149 strcat(mytaskfile, "/tasks"); 150 strcat(mysharesfile, "/cpu.shares"); 151 pid = getpid(); 152 write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */ 153 154 fd = open("./myfifo", 0); 155 if (fd == -1) { 156 tst_brkm(TBROK, cleanup, 157 "Could not open fifo for synchronization"); 158 } 159 160 read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */ 161 162 /* 163 * We now calculate the expected % cpu time of this task by getting 164 * it's group's shares, the total shares of all the groups and the 165 * number of tasks in this group. 166 */ 167 FLAG = 0; 168 total_shares = 0; 169 shares_pointer = &total_shares; 170 len = strlen(path); 171 if (!strncpy(fullpath, path, len)) 172 tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", 173 path); 174 175 if (scan_shares_files(shares_pointer) != 0) 176 tst_brkm(TBROK, cleanup, 177 "From function scan_shares_files in %s ", fullpath); 178 179 /* return val: -1 in case of function error, else 2 is min share value */ 180 if ((fmyshares = read_shares_file(mysharesfile)) < 2) 181 tst_brkm(TBROK, cleanup, "in reading shares files %s ", 182 mysharesfile); 183 184 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 185 tst_brkm(TBROK, cleanup, "in reading tasks files %s ", 186 mytaskfile); 187 188 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); 189 190 prev_time = time(NULL); /* Note down the time */ 191 192 while (1) { 193 /* Need to run some cpu intensive task, which also frequently checks the timer value */ 194 double f = 274.345, mytime; /*just a float number to take sqrt */ 195 alarm(TIME_INTERVAL); 196 timer_expired = 0; 197 while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */ 198 f = sqrt(f * f); /* Time of this operation should not be high otherwise we can 199 * exceed the TIME_INTERVAL to measure cpu usage 200 */ 201 current_time = time(NULL); 202 delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */ 203 204 getrusage(0, &cpu_usage); 205 total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */ 206 cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */ 207 delta_cpu_time = total_cpu_time - prev_cpu_time; 208 209 prev_cpu_time = total_cpu_time; 210 prev_time = current_time; 211 212 /* calculate % cpu time each task gets */ 213 if (delta_time > TIME_INTERVAL) 214 mytime = 215 (delta_cpu_time * 100) / (delta_time * num_cpus); 216 else 217 mytime = 218 (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); 219 220 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%)exp:-%6.2f(%%)}\ 221 with %u(shares) in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time, 222 mytime, exp_cpu_time, fmyshares, delta_time); 223 224 counter++; 225 226 if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */ 227 switch (test_num) { 228 case 4: /* Test04 */ 229 exit(0); /* This task is done with its job */ 230 break; 231 case 5: /* Test 05 */ 232 if (migrate == 0) { 233 counter = 0; 234 fprintf(stdout, 235 "FIRST RUN COMPLETED FOR TASK %d\n", 236 task_num); 237 migrate = 1; 238 } else { 239 fprintf(stdout, 240 "SECOND RUN COMPLETED FOR TASK %d\n", 241 task_num); 242 exit(0); 243 } 244 break; 245 default: 246 tst_brkm(TBROK, cleanup, 247 "Invalid test number passed\n"); 248 break; 249 250 } /* end switch */ 251 } 252 if ((migrate == 1) && (counter == 0)) { 253 if (task_num == 1) { 254 if (migrate_task() != 0) 255 tst_brkm(TFAIL, cleanup, 256 "Could not migrate task 1 "); 257 else 258 fprintf(stdout, 259 "TASK 1 MIGRATED FROM GROUP 1 TO GROUP 2\n"); 260 strcpy(mytaskfile, "/dev/cpuctl/group_2/tasks"); 261 } 262 /* 263 * Read the shares files and again calculate the cpu fraction 264 * In test 2(case 4) we need to read tasks file as we migrate task 265 * Q?? How to ensure other tasks do not read before task 1 migration 266 */ 267 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 268 tst_brkm(TBROK, cleanup, 269 "in reading tasks files %s ", 270 mytaskfile); 271 exp_cpu_time = 272 (double)(fmyshares * 100) / (total_shares * 273 num_tasks); 274 } 275 } /* end while */ 276 } /* end main */ 277 278 int migrate_task() 279 { 280 char target[32] = "/dev/cpuctl/group_2/tasks"; /* Hard coding..Will try dynamic */ 281 pid_t pid = getpid(); 282 return (write_to_file(target, "a", pid)); 283 } 284
