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_def01.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 1-3. */
29 /* */
30 /* Total Tests: 1 */
31 /* */
32 /* Test Name: cpu_controller_tests */
33 /* */
34 /* Test Assertion */
35 /* Please refer to the file cpuctl_testplan.txt */
36 /* */
37 /* Author: Sudhir Kumar skumar@linux.vnet.ibm.com */
38 /* */
39 /* History: */
40 /* Created- 14/11/2008 -Sudhir Kumar <skumar@linux.vnet.ibm.com> */
41 /* */
42 /******************************************************************************/
43
44 #include <unistd.h>
45 #include <math.h>
46 #include <signal.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <sys/resource.h>
51 #include <sys/syscall.h>
52 #include <sys/time.h>
53 #include <sys/types.h>
54 #include <sys/stat.h>
55 #include <fcntl.h>
56 #include <time.h>
57
58 #include "../libcontrollers/libcontrollers.h"
59 #include "test.h" /* LTP harness APIs */
60 #include "safe_macros.h"
61
62 #ifdef DEBUG
63 #define dbg(x...) printf(x);
64 #else
65 #define dbg(x...) do {} while (0)
66 #endif
67
68 #define TIME_INTERVAL 30 /* Time interval in seconds */
69 #define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */
70 #define NUM_SETS 4 /* How many share values (with same ratio) */
71 #define MULTIPLIER 10 /* Rate at which share value gets multiplied */
72
73 char *TCID = "cpu_controller_tests";
74 int TST_TOTAL = 1;
75 pid_t scriptpid;
76 char path[FILENAME_MAX] = "/dev/cpuctl";
77
cleanup(void)78 extern void cleanup(void)
79 {
80 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
81 /* Report exit status */
82 }
83
84 volatile int timer_expired = 0;
85
main(int argc,char * argv[])86 int main(int argc, char *argv[])
87 {
88
89 int num_cpus, test_num, len; /* Total time = TIME_INTERVAL*num_cpus */
90 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
91 char mysharesfile[FILENAME_MAX], ch;
92 pid_t pid;
93 int my_group_num; /* A number attached with a group */
94 int fd; /* To open a fifo for synchronization */
95 int first_counter = 0; /* To take n number of readings */
96 int second_counter = 0; /* no of times shares have changed */
97 double total_cpu_time; /* Accumulated cpu time */
98 double delta_cpu_time; /* Time the task could run on cpu(s) */
99 double prev_cpu_time = 0;
100 double exp_cpu_time; /* Exp time in % by shares calculation */
101 struct rusage cpu_usage;
102 time_t current_time, prev_time, delta_time;
103 unsigned long int myshares = 2, baseshares = 1000;
104 unsigned int fmyshares, num_tasks;
105 struct sigaction newaction, oldaction;
106
107 num_cpus = 0;
108 test_num = 0;
109 my_group_num = -1;
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 /* Check if all parameters passed are correct */
118 if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) ||
119 ((scriptpid = atoi(argv[3])) <= 0) ||
120 ((num_cpus = atoi(argv[4])) <= 0) ||
121 (test_num = atoi(argv[5])) <= 0)
122 tst_brkm(TBROK, cleanup, "Invalid input parameters\n");
123
124 if (test_num == 1)
125 myshares *= my_group_num;
126 else if (test_num == 3)
127 myshares = baseshares;
128 else
129 tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.\n");
130
131 sprintf(mygroup, "%s", argv[2]);
132 sprintf(mytaskfile, "%s", mygroup);
133 sprintf(mysharesfile, "%s", mygroup);
134 strcat(mytaskfile, "/tasks");
135 strcat(mysharesfile, "/cpu.shares");
136 pid = getpid();
137 write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */
138 write_to_file(mysharesfile, "w", myshares);
139 dbg("Default task's initial shares = %u", myshares);
140
141 fd = SAFE_OPEN(cleanup, "./myfifo", 0);
142
143 read(fd, &ch, 1); /* To fire all the tasks up at the same time */
144
145 /*
146 * We need not calculate the expected % cpu time of this task, as
147 * neither it is required nor it can be predicted as there are idle
148 * system tasks (and others too) in this group.
149 */
150 FLAG = 0;
151 total_shares = 0;
152 shares_pointer = &total_shares;
153 len = strlen(path);
154 if (!strncpy(fullpath, path, len))
155 tst_brkm(TBROK, cleanup,
156 "Could not copy directory path %s ", path);
157
158 if (scan_shares_files(shares_pointer) != 0)
159 tst_brkm(TBROK, cleanup,
160 "From function scan_shares_files in %s ", fullpath);
161
162 /* return val -1 in case of function error, else 2 is min share value */
163 if ((fmyshares = read_shares_file(mysharesfile)) < 2)
164 tst_brkm(TBROK, cleanup,
165 "in reading shares files %s ", mysharesfile);
166
167 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
168 tst_brkm(TBROK, cleanup,
169 "in reading tasks files %s ", mytaskfile);
170
171 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
172
173 prev_time = time(NULL); /* Note down the time */
174
175 while (1) {
176 /*
177 * Need to run some cpu intensive task, which also
178 * frequently checks the timer value
179 */
180 double f = 274.345, mytime; /*just a float number for sqrt */
181 alarm(TIME_INTERVAL);
182 timer_expired = 0;
183 /*
184 * Let the task run on cpu for TIME_INTERVAL. Time of this
185 * operation should not be high otherwise we can exceed the
186 * TIME_INTERVAL to measure cpu usage
187 */
188 while (!timer_expired)
189 f = sqrt(f * f);
190
191 current_time = time(NULL);
192 /* Duration in case its not exact TIME_INTERVAL */
193 delta_time = current_time - prev_time;
194
195 getrusage(0, &cpu_usage);
196 /* total_cpu_time = total user time + total sys time */
197 total_cpu_time = (cpu_usage.ru_utime.tv_sec +
198 cpu_usage.ru_utime.tv_usec * 1e-6 +
199 cpu_usage.ru_stime.tv_sec +
200 cpu_usage.ru_stime.tv_usec * 1e-6);
201 delta_cpu_time = total_cpu_time - prev_cpu_time;
202
203 prev_cpu_time = total_cpu_time;
204 prev_time = current_time;
205
206 /* calculate % cpu time each task gets */
207 if (delta_time > TIME_INTERVAL)
208 mytime = (delta_cpu_time * 100) /
209 (delta_time * num_cpus);
210 else
211 mytime = (delta_cpu_time * 100) /
212 (TIME_INTERVAL * num_cpus);
213
214 /*
215 * Lets print the results. The exp cpu time calculated may not
216 * be correct due to running system tasks at the moment
217 */
218 fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)"
219 " i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)"
220 " in %lu (s) INTERVAL\n", delta_cpu_time, mytime,
221 exp_cpu_time, myshares, delta_time);
222 first_counter++;
223
224 /* Take n sets of readings for each shares value */
225 if (first_counter >= NUM_INTERVALS) {
226 first_counter = 0;
227 second_counter++;
228 if (second_counter >= NUM_SETS)
229 exit(0); /* This task is done */
230
231 /* Keep same ratio but change values */
232 if (test_num == 1) {
233 myshares = MULTIPLIER * myshares;
234 write_to_file(mysharesfile, "w", myshares);
235 }
236 /* No need to change shares for def task for test 3 */
237
238 } /* end if */
239 } /* end while */
240 } /* end main */
241