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
69 char *TCID = "cpu_controller_test06";
70 int TST_TOTAL = 3;
71 pid_t scriptpid;
72 char path[] = "/dev/cpuctl";
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, task_num, len, num_cpus;
85 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
86 char mysharesfile[FILENAME_MAX], ch;
87 /* Following variables are to capture parameters from script */
88 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
89 char *test_num_p, *task_num_p;
90 pid_t pid;
91 gid_t mygroup_num; /* A number attached with a group */
92 int fd; /* to open a fifo to synchronize */
93 int counter = 0; /* To take n number of readings */
94 double total_cpu_time, /* Accumulated cpu time */
95 delta_cpu_time, /* Time the task could run on cpu(s) */
96 prev_cpu_time = 0;
97 double exp_cpu_time; /* Exp time in % by shares calculation */
98
99 struct rusage cpu_usage;
100 time_t current_time, prev_time, delta_time;
101 unsigned int fmyshares, num_tasks;
102 struct sigaction newaction, oldaction;
103
104 mygroup_num = -1;
105 num_cpus = 0;
106 task_num = 0;
107 test_num = 0;
108
109 /* Signal handling for alarm */
110 sigemptyset(&newaction.sa_mask);
111 newaction.sa_handler = signal_handler_alarm;
112 newaction.sa_flags = 0;
113 sigaction(SIGALRM, &newaction, &oldaction);
114
115 /* Collect the parameters passed by the script */
116 group_num_p = getenv("GROUP_NUM");
117 mygroup_p = getenv("MYGROUP");
118 script_pid_p = getenv("SCRIPT_PID");
119 num_cpus_p = getenv("NUM_CPUS");
120 test_num_p = getenv("TEST_NUM");
121 task_num_p = getenv("TASK_NUM");
122 /* Check if all of them are valid */
123 if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 8) &&
124 ((test_num = atoi(test_num_p)) >= 6))) {
125 if ((group_num_p != NULL) && (mygroup_p != NULL) &&
126 (script_pid_p != NULL) && (num_cpus_p != NULL) &&
127 (task_num_p != NULL)) {
128 mygroup_num = atoi(group_num_p);
129 scriptpid = atoi(script_pid_p);
130 num_cpus = atoi(num_cpus_p);
131 task_num = atoi(task_num_p);
132 sprintf(mygroup, "%s", mygroup_p);
133 } else {
134 tst_brkm(TBROK, cleanup,
135 "Invalid other input parameters\n");
136 }
137 } else {
138 tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
139 }
140
141 sprintf(mytaskfile, "%s", mygroup);
142 sprintf(mysharesfile, "%s", mygroup);
143 strcat(mytaskfile, "/tasks");
144 strcat(mysharesfile, "/cpu.shares");
145 pid = getpid();
146 write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */
147
148 fd = SAFE_OPEN(cleanup, "./myfifo", 0);
149
150 read(fd, &ch, 1); /* Block task here to synchronize */
151
152 /*
153 * We need not calculate the expected % cpu time of this task, as
154 * neither it is required nor it can be predicted as there are idle
155 * system tasks (and others too) in this group.
156 */
157 FLAG = 0;
158 total_shares = 0;
159 shares_pointer = &total_shares;
160 len = strlen(path);
161 if (!strncpy(fullpath, path, len))
162 tst_brkm(TBROK, cleanup,
163 "Could not copy directory path %s ", path);
164
165 if (scan_shares_files(shares_pointer) != 0)
166 tst_brkm(TBROK, cleanup,
167 "From function scan_shares_files in %s ", fullpath);
168
169 /* return val -1 in case of function error, else 2 is min share value */
170 if ((fmyshares = read_shares_file(mysharesfile)) < 2)
171 tst_brkm(TBROK, cleanup,
172 "in reading shares files %s ", mysharesfile);
173
174 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
175 tst_brkm(TBROK, cleanup,
176 "in reading tasks files %s ", mytaskfile);
177
178 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
179
180 prev_time = time(NULL); /* Note down the time */
181
182 while (1) {
183 /*
184 * Need to run some cpu intensive task, which also
185 * frequently checks the timer value
186 */
187 double f = 274.345, mytime; /*just a float number for sqrt */
188 alarm(TIME_INTERVAL);
189 timer_expired = 0;
190 /*
191 * Let the task run on cpu for TIME_INTERVAL. Time of this
192 * operation should not be high otherwise we can exceed the
193 * TIME_INTERVAL to measure cpu usage
194 */
195 while (!timer_expired)
196 f = sqrt(f * f);
197
198 current_time = time(NULL);
199 /* Duration in case its not exact TIME_INTERVAL */
200 delta_time = current_time - prev_time;
201
202 getrusage(0, &cpu_usage);
203 /* total_cpu_time = total user time + total sys time */
204 total_cpu_time = (cpu_usage.ru_utime.tv_sec +
205 cpu_usage.ru_utime.tv_usec * 1e-6 +
206 cpu_usage.ru_stime.tv_sec +
207 cpu_usage.ru_stime.tv_usec * 1e-6);
208 delta_cpu_time = total_cpu_time - prev_cpu_time;
209
210 prev_cpu_time = total_cpu_time;
211 prev_time = current_time;
212
213 /* calculate % cpu time each task gets */
214 if (delta_time > TIME_INTERVAL)
215 mytime = (delta_cpu_time * 100) /
216 (delta_time * num_cpus);
217 else
218 mytime = (delta_cpu_time * 100) /
219 (TIME_INTERVAL * num_cpus);
220
221 /* No neeed to print the results */
222 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)"
223 " i.e. %6.2f(%%) exp:-%6.2f(%%)} in %lu (s)\n",
224 mygroup_num, task_num, delta_cpu_time, mytime,
225 exp_cpu_time, delta_time);
226
227 counter++;
228
229 if (counter >= NUM_INTERVALS) {
230 switch (test_num) {
231 case 6: /* Test 06 */
232 case 7: /* Test 07 */
233 case 8: /* Test 08 */
234 exit(0); /* This task is done */
235 break;
236 default:
237 tst_brkm(TBROK, cleanup,
238 "Invalid test num passed\n");
239 break;
240
241 } /* end switch */
242 } /* end if */
243 } /* end while */
244 } /* end main */
245