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
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 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
89 char mysharesfile[FILENAME_MAX], ch;
90 /* Following variables are to capture parameters from script */
91 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
92 char *test_num_p, *task_num_p;
93 gid_t mygroup_num; /* A number attached with a group */
94 int fd; /* to open a fifo to synchronize */
95 int counter = 0; /* To take n number of readings */
96 double total_cpu_time; /* Accumulated cpu time */
97 double delta_cpu_time; /* Time the task could run on cpu(s) */
98 double prev_cpu_time = 0;
99 double exp_cpu_time; /* Exp time in % by shares calculation */
100
101 struct rusage cpu_usage;
102 time_t current_time, prev_time, delta_time;
103 unsigned int fmyshares, num_tasks;
104 unsigned int mygroup_shares;
105 struct sigaction newaction, oldaction;
106
107 mygroup_num = -1;
108 num_cpus = 0;
109 task_num = 0;
110 test_num = 0;
111
112 /* Signal handling for alarm */
113 sigemptyset(&newaction.sa_mask);
114 newaction.sa_handler = signal_handler_alarm;
115 newaction.sa_flags = 0;
116 sigaction(SIGALRM, &newaction, &oldaction);
117
118 /* Collect the parameters passed by the script */
119 group_num_p = getenv("GROUP_NUM");
120 mygroup_p = getenv("MYGROUP");
121 script_pid_p = getenv("SCRIPT_PID");
122 num_cpus_p = getenv("NUM_CPUS");
123 test_num_p = getenv("TEST_NUM");
124 task_num_p = getenv("TASK_NUM");
125 /* Check if all of them are valid */
126 if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 10) &&
127 ((test_num = atoi(test_num_p)) >= 9))) {
128 if ((group_num_p != NULL) && (mygroup_p != NULL) &&
129 (script_pid_p != NULL) && (num_cpus_p != NULL) &&
130 (task_num_p != NULL)) {
131 mygroup_num = atoi(group_num_p);
132 scriptpid = atoi(script_pid_p);
133 num_cpus = atoi(num_cpus_p);
134 task_num = atoi(task_num_p);
135 sprintf(mygroup, "%s", mygroup_p);
136 } else {
137 tst_brkm(TBROK, cleanup,
138 "Invalid other input parameters\n");
139 }
140 } else {
141 tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
142 }
143
144 sprintf(mytaskfile, "%s", mygroup);
145 sprintf(mysharesfile, "%s", mygroup);
146 strcat(mytaskfile, "/tasks");
147 strcat(mysharesfile, "/cpu.shares");
148
149 write_to_file(mytaskfile, "a", getpid());
150
151 /*
152 * Let us give the default group 100 shares, as other groups will have
153 * a multiple of 100 shares.
154 */
155 mygroup_shares = 100;
156 write_to_file(mysharesfile, "w", mygroup_shares);
157
158 fd = SAFE_OPEN(cleanup, "./myfifo", 0);
159
160 read(fd, &ch, 1); /* Block task here to synchronize */
161
162 /*
163 * We need not calculate the expected % cpu time of this task, as
164 * neither it is required nor it can be predicted as there are idle
165 * system tasks (and others too) 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,
173 "Could not copy directory path %s ", 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,
182 "in reading shares files %s ", mysharesfile);
183
184 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
185 tst_brkm(TBROK, cleanup,
186 "in reading tasks files %s ", 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 /*
194 * Need to run some cpu intensive task, which also
195 * frequently checks the timer value
196 */
197 double f = 274.345, mytime; /*just a float number for sqrt */
198 alarm(TIME_INTERVAL);
199 timer_expired = 0;
200 /*
201 * Let the task run on cpu for TIME_INTERVAL. Time of this
202 * operation should not be high otherwise we can exceed the
203 * TIME_INTERVAL to measure cpu usage
204 */
205 while (!timer_expired)
206 f = sqrt(f * f);
207
208 current_time = time(NULL);
209 /* Duration in case its not exact TIME_INTERVAL */
210 delta_time = current_time - prev_time;
211
212 getrusage(0, &cpu_usage);
213 /* total_cpu_time = total user time + total sys time */
214 total_cpu_time = (cpu_usage.ru_utime.tv_sec +
215 cpu_usage.ru_utime.tv_usec * 1e-6 +
216 cpu_usage.ru_stime.tv_sec +
217 cpu_usage.ru_stime.tv_usec * 1e-6);
218 delta_cpu_time = total_cpu_time - prev_cpu_time;
219
220 prev_cpu_time = total_cpu_time;
221 prev_time = current_time;
222
223 /* calculate % cpu time each task gets */
224 if (delta_time > TIME_INTERVAL)
225 mytime = (delta_cpu_time * 100) /
226 (delta_time * num_cpus);
227 else
228 mytime = (delta_cpu_time * 100) /
229 (TIME_INTERVAL * num_cpus);
230
231 /* No neeed to print the results */
232 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s) i.e."
233 " %6.2f(%%) exp:-%6.2f(%%)} with %3u shares in %lu (s)"
234 " INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
235 mytime, exp_cpu_time, fmyshares, delta_time);
236
237 counter++;
238
239 if (counter >= NUM_INTERVALS) {
240 switch (test_num) {
241
242 case 9: /* Test 09 */
243 case 10: /* Test 10 */
244 exit(0); /* This task is done */
245 break;
246 default:
247 tst_brkm(TBROK, cleanup,
248 "Invalid test number passed\n");
249 break;
250
251 } /* end switch */
252 } /* end if */
253 } /* end while */
254 } /* end main */
255