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_test02.c */
24 /* */
25 /* Description: This is a c program that tests the cpucontroller fairness of */
26 /* scheduling the tasks according to their group shares. This */
27 /* testcase tests the ability of the cpu controller to provide */
28 /* fairness for share values (absolute). */
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- 20/12/2007 -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 #include <unistd.h>
61
62 #include "../libcontrollers/libcontrollers.h"
63 #include "test.h" /* LTP harness APIs */
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 = "cpuctl_test02";
69 int TST_TOTAL = 1;
70 pid_t scriptpid;
71 char path[] = "/dev/cpuctl";
72
cleanup()73 extern void cleanup()
74 {
75 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
76 tst_exit(); /* Report exit status */
77 }
78
79 int migrate_task();
80 volatile int timer_expired = 0;
81
main(int argc,char * argv[])82 int main(int argc, char *argv[])
83 {
84
85 int test_num;
86 int task_num;
87 int len;
88 int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */
89 int migrate = 0; /* For task migration */
90 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
91 char mysharesfile[FILENAME_MAX], ch;
92 /* Following variables are to capture parameters from script */
93 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p,
94 *task_num_p;
95 pid_t pid;
96 gid_t mygroup_num; /* A number attached with a group */
97 int fd; /* A descriptor to open a fifo for synchronized start */
98 int counter = 0; /* To take n number of readings */
99 double total_cpu_time, /* Accumulated cpu time */
100 delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */
101 prev_cpu_time = 0;
102 double exp_cpu_time; /* Expected time in % as obtained by shares calculation */
103
104 struct rusage cpu_usage;
105 time_t current_time, prev_time, delta_time;
106 unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */
107 struct sigaction newaction, oldaction;
108
109 mygroup_num = -1;
110 num_cpus = 0;
111 task_num = 0;
112 test_num = 0;
113
114 /* Signal handling for alarm */
115 sigemptyset(&newaction.sa_mask);
116 newaction.sa_handler = signal_handler_alarm;
117 newaction.sa_flags = 0;
118 sigaction(SIGALRM, &newaction, &oldaction);
119
120 /* Collect the parameters passed by the script */
121 group_num_p = getenv("GROUP_NUM");
122 mygroup_p = getenv("MYGROUP");
123 script_pid_p = getenv("SCRIPT_PID");
124 num_cpus_p = getenv("NUM_CPUS");
125 test_num_p = getenv("TEST_NUM");
126 task_num_p = getenv("TASK_NUM");
127 /* Check if all of them are valid */
128 if ((test_num_p != NULL)
129 && (((test_num = atoi(test_num_p)) == 4)
130 || ((test_num = atoi(test_num_p)) == 5))) {
131 if ((group_num_p != NULL) && (mygroup_p != NULL)
132 && (script_pid_p != NULL) && (num_cpus_p != NULL)
133 && (task_num_p != NULL)) {
134 mygroup_num = atoi(group_num_p);
135 scriptpid = atoi(script_pid_p);
136 num_cpus = atoi(num_cpus_p);
137 task_num = atoi(task_num_p);
138 sprintf(mygroup, "%s", mygroup_p);
139 } else {
140 tst_brkm(TBROK, cleanup,
141 "Invalid other input parameters\n");
142 }
143 } else {
144 tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
145 }
146
147 sprintf(mytaskfile, "%s", mygroup);
148 sprintf(mysharesfile, "%s", mygroup);
149 strcat(mytaskfile, "/tasks");
150 strcat(mysharesfile, "/cpu.shares");
151 pid = getpid();
152 write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */
153
154 fd = open("./myfifo", 0);
155 if (fd == -1) {
156 tst_brkm(TBROK, cleanup,
157 "Could not open fifo for synchronization");
158 }
159
160 read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */
161
162 /*
163 * We now calculate the expected % cpu time of this task by getting
164 * it's group's shares, the total shares of all the groups and the
165 * number of tasks 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, "Could not copy directory path %s ",
173 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, "in reading shares files %s ",
182 mysharesfile);
183
184 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
185 tst_brkm(TBROK, cleanup, "in reading tasks files %s ",
186 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 /* Need to run some cpu intensive task, which also frequently checks the timer value */
194 double f = 274.345, mytime; /*just a float number to take sqrt */
195 alarm(TIME_INTERVAL);
196 timer_expired = 0;
197 while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */
198 f = sqrt(f * f); /* Time of this operation should not be high otherwise we can
199 * exceed the TIME_INTERVAL to measure cpu usage
200 */
201 current_time = time(NULL);
202 delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */
203
204 getrusage(0, &cpu_usage);
205 total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */
206 cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */
207 delta_cpu_time = total_cpu_time - prev_cpu_time;
208
209 prev_cpu_time = total_cpu_time;
210 prev_time = current_time;
211
212 /* calculate % cpu time each task gets */
213 if (delta_time > TIME_INTERVAL)
214 mytime =
215 (delta_cpu_time * 100) / (delta_time * num_cpus);
216 else
217 mytime =
218 (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus);
219
220 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%)exp:-%6.2f(%%)}\
221 with %u(shares) in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
222 mytime, exp_cpu_time, fmyshares, delta_time);
223
224 counter++;
225
226 if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */
227 switch (test_num) {
228 case 4: /* Test04 */
229 exit(0); /* This task is done with its job */
230 break;
231 case 5: /* Test 05 */
232 if (migrate == 0) {
233 counter = 0;
234 fprintf(stdout,
235 "FIRST RUN COMPLETED FOR TASK %d\n",
236 task_num);
237 migrate = 1;
238 } else {
239 fprintf(stdout,
240 "SECOND RUN COMPLETED FOR TASK %d\n",
241 task_num);
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 if ((migrate == 1) && (counter == 0)) {
253 if (task_num == 1) {
254 if (migrate_task() != 0)
255 tst_brkm(TFAIL, cleanup,
256 "Could not migrate task 1 ");
257 else
258 fprintf(stdout,
259 "TASK 1 MIGRATED FROM GROUP 1 TO GROUP 2\n");
260 strcpy(mytaskfile, "/dev/cpuctl/group_2/tasks");
261 }
262 /*
263 * Read the shares files and again calculate the cpu fraction
264 * In test 2(case 4) we need to read tasks file as we migrate task
265 * Q?? How to ensure other tasks do not read before task 1 migration
266 */
267 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
268 tst_brkm(TBROK, cleanup,
269 "in reading tasks files %s ",
270 mytaskfile);
271 exp_cpu_time =
272 (double)(fmyshares * 100) / (total_shares *
273 num_tasks);
274 }
275 } /* end while */
276 } /* end main */
277
migrate_task()278 int migrate_task()
279 {
280 char target[32] = "/dev/cpuctl/group_2/tasks"; /* Hard coding..Will try dynamic */
281 pid_t pid = getpid();
282 return (write_to_file(target, "a", pid));
283 }
284