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
65 #define TIME_INTERVAL 100 /* Time interval in seconds */
66 #define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */
67
68 char *TCID = "cpu_controller_test06";
69 int TST_TOTAL = 2;
70 pid_t scriptpid;
71 char path[] = "/dev/cpuctl";
cleanup()72 extern void cleanup()
73 {
74 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
75 /* Report exit status */
76 }
77
78 volatile int timer_expired = 0;
79
main(int argc,char * argv[])80 int main(int argc, char *argv[])
81 {
82
83 int test_num;
84 int task_num;
85 int len;
86 int num_cpus;
87 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
88 char mysharesfile[FILENAME_MAX], ch;
89 /* Following variables are to capture parameters from script */
90 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
91 char *test_num_p, *task_num_p;
92 gid_t mygroup_num; /* A number attached with a group */
93 int fd; /* to open a fifo to synchronize */
94 int counter = 0; /* To take n number of readings */
95 double total_cpu_time; /* Accumulated cpu time */
96 double delta_cpu_time; /* Time the task could run on cpu(s) */
97 double prev_cpu_time = 0;
98 double exp_cpu_time; /* Exp time in % by shares calculation */
99
100 struct rusage cpu_usage;
101 time_t current_time, prev_time, delta_time;
102 unsigned int fmyshares, num_tasks;
103 unsigned int mygroup_shares;
104 struct sigaction newaction, oldaction;
105
106 mygroup_num = -1;
107 num_cpus = 0;
108 task_num = 0;
109 test_num = 0;
110
111 /* Signal handling for alarm */
112 sigemptyset(&newaction.sa_mask);
113 newaction.sa_handler = signal_handler_alarm;
114 newaction.sa_flags = 0;
115 sigaction(SIGALRM, &newaction, &oldaction);
116
117 /* Collect the parameters passed by the script */
118 group_num_p = getenv("GROUP_NUM");
119 mygroup_p = getenv("MYGROUP");
120 script_pid_p = getenv("SCRIPT_PID");
121 num_cpus_p = getenv("NUM_CPUS");
122 test_num_p = getenv("TEST_NUM");
123 task_num_p = getenv("TASK_NUM");
124 /* Check if all of them are valid */
125 if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 10) &&
126 ((test_num = atoi(test_num_p)) >= 9))) {
127 if ((group_num_p != NULL) && (mygroup_p != NULL) &&
128 (script_pid_p != NULL) && (num_cpus_p != NULL) &&
129 (task_num_p != NULL)) {
130 mygroup_num = atoi(group_num_p);
131 scriptpid = atoi(script_pid_p);
132 num_cpus = atoi(num_cpus_p);
133 task_num = atoi(task_num_p);
134 sprintf(mygroup, "%s", mygroup_p);
135 } else {
136 tst_brkm(TBROK, cleanup,
137 "Invalid other input parameters\n");
138 }
139 } else {
140 tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
141 }
142
143 sprintf(mytaskfile, "%s", mygroup);
144 sprintf(mysharesfile, "%s", mygroup);
145 strcat(mytaskfile, "/tasks");
146 strcat(mysharesfile, "/cpu.shares");
147
148 write_to_file(mytaskfile, "a", getpid());
149
150 /*
151 * Let us give the default group 100 shares, as other groups will have
152 * a multiple of 100 shares.
153 */
154 mygroup_shares = 100;
155 write_to_file(mysharesfile, "w", mygroup_shares);
156
157 fd = open("./myfifo", 0);
158 if (fd == -1)
159 tst_brkm(TBROK, cleanup, "Could not open fifo synchronize");
160
161 read(fd, &ch, 1); /* Block task here to synchronize */
162
163 /*
164 * We need not calculate the expected % cpu time of this task, as
165 * neither it is required nor it can be predicted as there are idle
166 * system tasks (and others too) in this group.
167 */
168 FLAG = 0;
169 total_shares = 0;
170 shares_pointer = &total_shares;
171 len = strlen(path);
172 if (!strncpy(fullpath, path, len))
173 tst_brkm(TBROK, cleanup,
174 "Could not copy directory path %s ", path);
175
176 if (scan_shares_files(shares_pointer) != 0)
177 tst_brkm(TBROK, cleanup,
178 "From function scan_shares_files in %s ", fullpath);
179
180 /* return val -1 in case of function error, else 2 is min share value */
181 if ((fmyshares = read_shares_file(mysharesfile)) < 2)
182 tst_brkm(TBROK, cleanup,
183 "in reading shares files %s ", mysharesfile);
184
185 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
186 tst_brkm(TBROK, cleanup,
187 "in reading tasks files %s ", mytaskfile);
188
189 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
190
191 prev_time = time(NULL); /* Note down the time */
192
193 while (1) {
194 /*
195 * Need to run some cpu intensive task, which also
196 * frequently checks the timer value
197 */
198 double f = 274.345, mytime; /*just a float number for sqrt */
199 alarm(TIME_INTERVAL);
200 timer_expired = 0;
201 /*
202 * Let the task run on cpu for TIME_INTERVAL. Time of this
203 * operation should not be high otherwise we can exceed the
204 * TIME_INTERVAL to measure cpu usage
205 */
206 while (!timer_expired)
207 f = sqrt(f * f);
208
209 current_time = time(NULL);
210 /* Duration in case its not exact TIME_INTERVAL */
211 delta_time = current_time - prev_time;
212
213 getrusage(0, &cpu_usage);
214 /* total_cpu_time = total user time + total sys time */
215 total_cpu_time = (cpu_usage.ru_utime.tv_sec +
216 cpu_usage.ru_utime.tv_usec * 1e-6 +
217 cpu_usage.ru_stime.tv_sec +
218 cpu_usage.ru_stime.tv_usec * 1e-6);
219 delta_cpu_time = total_cpu_time - prev_cpu_time;
220
221 prev_cpu_time = total_cpu_time;
222 prev_time = current_time;
223
224 /* calculate % cpu time each task gets */
225 if (delta_time > TIME_INTERVAL)
226 mytime = (delta_cpu_time * 100) /
227 (delta_time * num_cpus);
228 else
229 mytime = (delta_cpu_time * 100) /
230 (TIME_INTERVAL * num_cpus);
231
232 /* No neeed to print the results */
233 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s) i.e."
234 " %6.2f(%%) exp:-%6.2f(%%)} with %3u shares in %lu (s)"
235 " INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
236 mytime, exp_cpu_time, fmyshares, delta_time);
237
238 counter++;
239
240 if (counter >= NUM_INTERVALS) {
241 switch (test_num) {
242
243 case 9: /* Test 09 */
244 case 10: /* Test 10 */
245 exit(0); /* This task is done */
246 break;
247 default:
248 tst_brkm(TBROK, cleanup,
249 "Invalid test number passed\n");
250 break;
251
252 } /* end switch */
253 } /* end if */
254 } /* end while */
255 } /* end main */
256