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@linux.vnet.ibm.com */
41 /* */
42 /* History: */
43 /* Created- 20/11/2008 -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/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 #include "safe_macros.h"
65
66 #define TIME_INTERVAL 100 /* 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 = 2;
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
main(void)79 int main(void)
80 {
81
82 int test_num;
83 int task_num;
84 int len;
85 int num_cpus;
86 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
87 char mysharesfile[FILENAME_MAX], ch;
88 /* Following variables are to capture parameters from script */
89 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
90 char *test_num_p, *task_num_p;
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 double delta_cpu_time; /* Time the task could run on cpu(s) */
96 double 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 unsigned int mygroup_shares;
103 struct sigaction newaction, oldaction;
104
105 mygroup_num = -1;
106 num_cpus = 0;
107 task_num = 0;
108 test_num = 0;
109
110 /* Signal handling for alarm */
111 sigemptyset(&newaction.sa_mask);
112 newaction.sa_handler = signal_handler_alarm;
113 newaction.sa_flags = 0;
114 sigaction(SIGALRM, &newaction, &oldaction);
115
116 /* Collect the parameters passed by the script */
117 group_num_p = getenv("GROUP_NUM");
118 mygroup_p = getenv("MYGROUP");
119 script_pid_p = getenv("SCRIPT_PID");
120 num_cpus_p = getenv("NUM_CPUS");
121 test_num_p = getenv("TEST_NUM");
122 task_num_p = getenv("TASK_NUM");
123 /* Check if all of them are valid */
124 if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 10) &&
125 ((test_num = atoi(test_num_p)) >= 9))) {
126 if ((group_num_p != NULL) && (mygroup_p != NULL) &&
127 (script_pid_p != NULL) && (num_cpus_p != NULL) &&
128 (task_num_p != NULL)) {
129 mygroup_num = atoi(group_num_p);
130 scriptpid = atoi(script_pid_p);
131 num_cpus = atoi(num_cpus_p);
132 task_num = atoi(task_num_p);
133 sprintf(mygroup, "%s", mygroup_p);
134 } else {
135 tst_brkm(TBROK, cleanup,
136 "Invalid other input parameters");
137 }
138 } else {
139 tst_brkm(TBROK, cleanup, "Invalid test number passed");
140 }
141
142 sprintf(mytaskfile, "%s", mygroup);
143 sprintf(mysharesfile, "%s", mygroup);
144 strcat(mytaskfile, "/tasks");
145 strcat(mysharesfile, "/cpu.shares");
146
147 write_to_file(mytaskfile, "a", getpid());
148
149 /*
150 * Let us give the default group 100 shares, as other groups will have
151 * a multiple of 100 shares.
152 */
153 mygroup_shares = 100;
154 write_to_file(mysharesfile, "w", mygroup_shares);
155
156 fd = SAFE_OPEN(cleanup, "./myfifo", 0);
157
158 read(fd, &ch, 1); /* Block task here to synchronize */
159
160 /*
161 * We need not calculate the expected % cpu time of this task, as
162 * neither it is required nor it can be predicted as there are idle
163 * system tasks (and others too) in this group.
164 */
165 FLAG = 0;
166 total_shares = 0;
167 shares_pointer = &total_shares;
168 len = strlen(path);
169 if (!strncpy(fullpath, path, len))
170 tst_brkm(TBROK, cleanup,
171 "Could not copy directory path %s ", path);
172
173 if (scan_shares_files(shares_pointer) != 0)
174 tst_brkm(TBROK, cleanup,
175 "From function scan_shares_files in %s ", fullpath);
176
177 /* return val -1 in case of function error, else 2 is min share value */
178 if ((fmyshares = read_shares_file(mysharesfile)) < 2)
179 tst_brkm(TBROK, cleanup,
180 "in reading shares files %s ", mysharesfile);
181
182 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
183 tst_brkm(TBROK, cleanup,
184 "in reading tasks files %s ", mytaskfile);
185
186 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
187
188 prev_time = time(NULL); /* Note down the time */
189
190 while (1) {
191 /*
192 * Need to run some cpu intensive task, which also
193 * frequently checks the timer value
194 */
195 double f = 274.345, mytime; /*just a float number for sqrt */
196 alarm(TIME_INTERVAL);
197 timer_expired = 0;
198 /*
199 * Let the task run on cpu for TIME_INTERVAL. Time of this
200 * operation should not be high otherwise we can exceed the
201 * TIME_INTERVAL to measure cpu usage
202 */
203 while (!timer_expired)
204 f = sqrt(f * f);
205
206 current_time = time(NULL);
207 /* Duration in case its not exact TIME_INTERVAL */
208 delta_time = current_time - prev_time;
209
210 getrusage(0, &cpu_usage);
211 /* total_cpu_time = total user time + total sys time */
212 total_cpu_time = (cpu_usage.ru_utime.tv_sec +
213 cpu_usage.ru_utime.tv_usec * 1e-6 +
214 cpu_usage.ru_stime.tv_sec +
215 cpu_usage.ru_stime.tv_usec * 1e-6);
216 delta_cpu_time = total_cpu_time - prev_cpu_time;
217
218 prev_cpu_time = total_cpu_time;
219 prev_time = current_time;
220
221 /* calculate % cpu time each task gets */
222 if (delta_time > TIME_INTERVAL)
223 mytime = (delta_cpu_time * 100) /
224 (delta_time * num_cpus);
225 else
226 mytime = (delta_cpu_time * 100) /
227 (TIME_INTERVAL * num_cpus);
228
229 /* No neeed to print the results */
230 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s) i.e."
231 " %6.2f(%%) exp:-%6.2f(%%)} with %3u shares in %lu (s)"
232 " INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
233 mytime, exp_cpu_time, fmyshares, delta_time);
234
235 counter++;
236
237 if (counter >= NUM_INTERVALS) {
238 switch (test_num) {
239
240 case 9: /* Test 09 */
241 case 10: /* Test 10 */
242 exit(0); /* This task is done */
243 break;
244 default:
245 tst_brkm(TBROK, cleanup,
246 "Invalid test number passed");
247 break;
248
249 } /* end switch */
250 } /* end if */
251 } /* end while */
252 } /* end main */
253