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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 4-5.                          */
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@linux.vnet.ibm.com                        */
41 /*                                                                            */
42 /* History:                                                                   */
43 /* Created-     18/11/2008 -Sudhir Kumar <skumar@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 
61 #include "../libcontrollers/libcontrollers.h"
62 #include "test.h"		/* LTP harness APIs */
63 #include "safe_macros.h"
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 = "cpu_controller_test04";
69 int TST_TOTAL = 1;
70 pid_t scriptpid;
71 char path[] = "/dev/cpuctl";
72 
cleanup(void)73 extern void cleanup(void)
74 {
75 	kill(scriptpid, SIGUSR1);	/* Inform the shell to do cleanup */
76 	/* Report exit status */
77 }
78 
79 volatile int timer_expired = 0;
80 
main(int argc,char * argv[])81 int main(int argc, char *argv[])
82 {
83 
84 	int test_num;
85 	int task_num;
86 	int len;
87 	int num_cpus;
88 	int migrate = 0;	/* For task migration */
89 	char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
90 	char mysharesfile[FILENAME_MAX], ch;
91 	/* Following variables are to capture parameters from script */
92 	char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
93 	char *test_num_p, *task_num_p;
94 	pid_t pid;
95 	gid_t mygroup_num;	/* A number attached with a group */
96 	int fd;			/* to open a fifo to synchronize */
97 	int counter = 0;	/* To take n number of readings */
98 	double total_cpu_time;	/* Accumulated cpu time */
99 	double delta_cpu_time;	/* Time the task could run on cpu(s) */
100 	double prev_cpu_time = 0;
101 	double exp_cpu_time;	/* Exp time in % by shares calculation */
102 
103 	struct rusage cpu_usage;
104 	time_t current_time, prev_time, delta_time;
105 	unsigned int fmyshares, num_tasks;
106 	struct sigaction newaction, oldaction;
107 
108 	mygroup_num = -1;
109 	num_cpus = 0;
110 	task_num = 0;
111 	test_num = 0;
112 
113 	/* Signal handling for alarm */
114 	sigemptyset(&newaction.sa_mask);
115 	newaction.sa_handler = signal_handler_alarm;
116 	newaction.sa_flags = 0;
117 	sigaction(SIGALRM, &newaction, &oldaction);
118 
119 	/* Collect the parameters passed by the script */
120 	group_num_p = getenv("GROUP_NUM");
121 	mygroup_p = getenv("MYGROUP");
122 	script_pid_p = getenv("SCRIPT_PID");
123 	num_cpus_p = getenv("NUM_CPUS");
124 	test_num_p = getenv("TEST_NUM");
125 	task_num_p = getenv("TASK_NUM");
126 	/* Check if all of them are valid */
127 	if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) == 4) ||
128 				     ((test_num = atoi(test_num_p)) == 5))) {
129 		if ((group_num_p != NULL) && (mygroup_p != NULL) &&
130 		    (script_pid_p != NULL) && (num_cpus_p != NULL) &&
131 		    (task_num_p != NULL)) {
132 			mygroup_num = atoi(group_num_p);
133 			scriptpid = atoi(script_pid_p);
134 			num_cpus = atoi(num_cpus_p);
135 			task_num = atoi(task_num_p);
136 			sprintf(mygroup, "%s", mygroup_p);
137 		} else {
138 			tst_brkm(TBROK, cleanup,
139 				 "Invalid other input parameters\n");
140 		}
141 	} else {
142 		tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
143 	}
144 
145 	sprintf(mytaskfile, "%s", mygroup);
146 	sprintf(mysharesfile, "%s", mygroup);
147 	strcat(mytaskfile, "/tasks");
148 	strcat(mysharesfile, "/cpu.shares");
149 	pid = getpid();
150 	write_to_file(mytaskfile, "a", pid);	/* Assign task to it's group */
151 
152 	fd = SAFE_OPEN(cleanup, "./myfifo", 0);
153 
154 	read(fd, &ch, 1);	/* Block task here to synchronize */
155 
156 	/*
157 	 * We now calculate the expected % cpu time of this task by getting
158 	 * it's group's shares, the total shares of all the groups and the
159 	 * number of tasks in this group.
160 	 */
161 	FLAG = 0;
162 	total_shares = 0;
163 	shares_pointer = &total_shares;
164 	len = strlen(path);
165 	if (!strncpy(fullpath, path, len))
166 		tst_brkm(TBROK, cleanup,
167 			 "Could not copy directory path %s ", path);
168 
169 	if (scan_shares_files(shares_pointer) != 0)
170 		tst_brkm(TBROK, cleanup,
171 			 "From function scan_shares_files in %s ", fullpath);
172 
173 	/* return val -1 in case of function error, else 2 is min share value */
174 	if ((fmyshares = read_shares_file(mysharesfile)) < 2)
175 		tst_brkm(TBROK, cleanup,
176 			 "in reading shares files  %s ", mysharesfile);
177 
178 	if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
179 		tst_brkm(TBROK, cleanup,
180 			 "in reading tasks files  %s ", mytaskfile);
181 
182 	exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
183 
184 	prev_time = time(NULL);	/* Note down the time */
185 
186 	while (1) {
187 		/*
188 		 * Need to run some cpu intensive task, which also
189 		 * frequently checks the timer value
190 		 */
191 		double f = 274.345, mytime;	/*just a float number for sqrt */
192 		alarm(TIME_INTERVAL);
193 		timer_expired = 0;
194 		/*
195 		 * Let the task run on cpu for TIME_INTERVAL. Time of this
196 		 * operation should not be high otherwise we can exceed the
197 		 * TIME_INTERVAL to measure cpu usage
198 		 */
199 		while (!timer_expired)
200 			f = sqrt(f * f);
201 
202 		current_time = time(NULL);
203 		/* Duration in case its not exact TIME_INTERVAL */
204 		delta_time = current_time - prev_time;
205 
206 		getrusage(0, &cpu_usage);
207 		/* total_cpu_time = total user time + total sys time */
208 		total_cpu_time = (cpu_usage.ru_utime.tv_sec +
209 				  cpu_usage.ru_utime.tv_usec * 1e-6 +
210 				  cpu_usage.ru_stime.tv_sec +
211 				  cpu_usage.ru_stime.tv_usec * 1e-6);
212 		delta_cpu_time = total_cpu_time - prev_cpu_time;
213 
214 		prev_cpu_time = total_cpu_time;
215 		prev_time = current_time;
216 
217 		/* calculate % cpu time each task gets */
218 		if (delta_time > TIME_INTERVAL)
219 			mytime = (delta_cpu_time * 100) /
220 			    (delta_time * num_cpus);
221 		else
222 			mytime = (delta_cpu_time * 100) /
223 			    (TIME_INTERVAL * num_cpus);
224 
225 		fprintf(stdout, "Grp:-%3dDEF task-%3d: CPU TIME{calc:-%6.2f(s)"
226 			"i.e. %6.2f(%%)exp:-%6.2f(%%)} with %u(shares) in %lu"
227 			" (s)\n", mygroup_num, task_num, delta_cpu_time, mytime,
228 			exp_cpu_time, fmyshares, delta_time);
229 
230 		counter++;
231 
232 		if (counter >= NUM_INTERVALS) {
233 			switch (test_num) {
234 			case 4:	/* Test04 */
235 				exit(0);	/* This task is done its job */
236 				break;
237 			case 5:	/* Test 05 */
238 				if (migrate == 0) {
239 					counter = 0;
240 					migrate = 1;
241 				} else {
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 	}			/* end while */
253 }				/* end main */
254