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 #include "safe_macros.h"
65
66 #define TIME_INTERVAL 30 /* Time interval in seconds */
67 #define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */
68
69 char *TCID = "cpuctl_test02";
70 int TST_TOTAL = 1;
71 pid_t scriptpid;
72 char path[] = "/dev/cpuctl";
73
cleanup(void)74 extern void cleanup(void)
75 {
76 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
77 tst_exit(); /* Report exit status */
78 }
79
80 int migrate_task();
81 volatile int timer_expired = 0;
82
main(void)83 int main(void)
84 {
85
86 int test_num;
87 int task_num;
88 int len;
89 int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */
90 int migrate = 0; /* For task migration */
91 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
92 char mysharesfile[FILENAME_MAX], ch;
93 /* Following variables are to capture parameters from script */
94 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p,
95 *task_num_p;
96 pid_t pid;
97 gid_t mygroup_num; /* A number attached with a group */
98 int fd; /* A descriptor to open a fifo for synchronized start */
99 int counter = 0; /* To take n number of readings */
100 double total_cpu_time, /* Accumulated cpu time */
101 delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */
102 prev_cpu_time = 0;
103 double exp_cpu_time; /* Expected time in % as obtained by shares calculation */
104
105 struct rusage cpu_usage;
106 time_t current_time, prev_time, delta_time;
107 unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */
108 struct sigaction newaction, oldaction;
109
110 mygroup_num = -1;
111 num_cpus = 0;
112 task_num = 0;
113 test_num = 0;
114
115 /* Signal handling for alarm */
116 sigemptyset(&newaction.sa_mask);
117 newaction.sa_handler = signal_handler_alarm;
118 newaction.sa_flags = 0;
119 sigaction(SIGALRM, &newaction, &oldaction);
120
121 /* Collect the parameters passed by the script */
122 group_num_p = getenv("GROUP_NUM");
123 mygroup_p = getenv("MYGROUP");
124 script_pid_p = getenv("SCRIPT_PID");
125 num_cpus_p = getenv("NUM_CPUS");
126 test_num_p = getenv("TEST_NUM");
127 task_num_p = getenv("TASK_NUM");
128 /* Check if all of them are valid */
129 if ((test_num_p != NULL)
130 && (((test_num = atoi(test_num_p)) == 4)
131 || ((test_num = atoi(test_num_p)) == 5))) {
132 if ((group_num_p != NULL) && (mygroup_p != NULL)
133 && (script_pid_p != NULL) && (num_cpus_p != NULL)
134 && (task_num_p != NULL)) {
135 mygroup_num = atoi(group_num_p);
136 scriptpid = atoi(script_pid_p);
137 num_cpus = atoi(num_cpus_p);
138 task_num = atoi(task_num_p);
139 sprintf(mygroup, "%s", mygroup_p);
140 } else {
141 tst_brkm(TBROK, cleanup,
142 "Invalid other input parameters\n");
143 }
144 } else {
145 tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
146 }
147
148 sprintf(mytaskfile, "%s", mygroup);
149 sprintf(mysharesfile, "%s", mygroup);
150 strcat(mytaskfile, "/tasks");
151 strcat(mysharesfile, "/cpu.shares");
152 pid = getpid();
153 write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */
154
155 fd = SAFE_OPEN(cleanup, "./myfifo", 0);
156
157 read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */
158
159 /*
160 * We now calculate the expected % cpu time of this task by getting
161 * it's group's shares, the total shares of all the groups and the
162 * number of tasks in this group.
163 */
164 FLAG = 0;
165 total_shares = 0;
166 shares_pointer = &total_shares;
167 len = strlen(path);
168 if (!strncpy(fullpath, path, len))
169 tst_brkm(TBROK, cleanup, "Could not copy directory path %s ",
170 path);
171
172 if (scan_shares_files(shares_pointer) != 0)
173 tst_brkm(TBROK, cleanup,
174 "From function scan_shares_files in %s ", fullpath);
175
176 /* return val: -1 in case of function error, else 2 is min share value */
177 if ((fmyshares = read_shares_file(mysharesfile)) < 2)
178 tst_brkm(TBROK, cleanup, "in reading shares files %s ",
179 mysharesfile);
180
181 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
182 tst_brkm(TBROK, cleanup, "in reading tasks files %s ",
183 mytaskfile);
184
185 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
186
187 prev_time = time(NULL); /* Note down the time */
188
189 while (1) {
190 /* Need to run some cpu intensive task, which also frequently checks the timer value */
191 double f = 274.345, mytime; /*just a float number to take sqrt */
192 alarm(TIME_INTERVAL);
193 timer_expired = 0;
194 while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */
195 f = sqrt(f * f); /* Time of this operation should not be high otherwise we can
196 * exceed the TIME_INTERVAL to measure cpu usage
197 */
198 current_time = time(NULL);
199 delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */
200
201 getrusage(0, &cpu_usage);
202 total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */
203 cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */
204 delta_cpu_time = total_cpu_time - prev_cpu_time;
205
206 prev_cpu_time = total_cpu_time;
207 prev_time = current_time;
208
209 /* calculate % cpu time each task gets */
210 if (delta_time > TIME_INTERVAL)
211 mytime =
212 (delta_cpu_time * 100) / (delta_time * num_cpus);
213 else
214 mytime =
215 (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus);
216
217 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%)exp:-%6.2f(%%)}\
218 with %u(shares) in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
219 mytime, exp_cpu_time, fmyshares, delta_time);
220
221 counter++;
222
223 if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */
224 switch (test_num) {
225 case 4: /* Test04 */
226 exit(0); /* This task is done with its job */
227 break;
228 case 5: /* Test 05 */
229 if (migrate == 0) {
230 counter = 0;
231 fprintf(stdout,
232 "FIRST RUN COMPLETED FOR TASK %d\n",
233 task_num);
234 migrate = 1;
235 } else {
236 fprintf(stdout,
237 "SECOND RUN COMPLETED FOR TASK %d\n",
238 task_num);
239 exit(0);
240 }
241 break;
242 default:
243 tst_brkm(TBROK, cleanup,
244 "Invalid test number passed\n");
245 break;
246
247 } /* end switch */
248 }
249 if ((migrate == 1) && (counter == 0)) {
250 if (task_num == 1) {
251 if (migrate_task() != 0)
252 tst_brkm(TFAIL, cleanup,
253 "Could not migrate task 1 ");
254 else
255 fprintf(stdout,
256 "TASK 1 MIGRATED FROM GROUP 1 TO GROUP 2\n");
257 strcpy(mytaskfile, "/dev/cpuctl/group_2/tasks");
258 }
259 /*
260 * Read the shares files and again calculate the cpu fraction
261 * In test 2(case 4) we need to read tasks file as we migrate task
262 * Q?? How to ensure other tasks do not read before task 1 migration
263 */
264 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
265 tst_brkm(TBROK, cleanup,
266 "in reading tasks files %s ",
267 mytaskfile);
268 exp_cpu_time =
269 (double)(fmyshares * 100) / (total_shares *
270 num_tasks);
271 }
272 } /* end while */
273 } /* end main */
274
migrate_task(void)275 int migrate_task(void)
276 {
277 char target[32] = "/dev/cpuctl/group_2/tasks"; /* Hard coding..Will try dynamic */
278 pid_t pid = getpid();
279 return (write_to_file(target, "a", pid));
280 }
281