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