cpuctl_def_task03.c revision 4af6d295d0a6e25214838f1237e9ec7cc9600ef8 
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_def02.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 6-8.                          */
29/*                                                                            */
30/* Total Tests: 3                                                             */
31/*                                                                            */
32/* Test 6:      N X M (N groups with M tasks each)                            */
33/* Test 7:      N*M X 1 (N*M groups with 1 task each)                         */
34/* Test 8:      1 X N*M (1 group with N*M tasks each)                         */
35/*                                                                            */
36/* Test Name:   cpu_controller_test 6,7,8                                     */
37/*                                                                            */
38/* Test Assertion                                                             */
39/*              Please refer to the file cpuctl_testplan.txt                  */
40/*                                                                            */
41/* Author:      Sudhir Kumar skumar@linux.vnet.ibm.com                        */
42/*                                                                            */
43/* History:                                                                   */
44/* Created-     20/11/2008 -Sudhir Kumar <skumar@linux.vnet.ibm.com>          */
45/*                                                                            */
46/******************************************************************************/
47
48#include <unistd.h>
49#include <math.h>
50#include <signal.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <string.h>
54#include <sys/resource.h>
55#include <sys/syscall.h>
56#include <sys/stat.h>
57#include <fcntl.h>
58#include <sys/time.h>
59#include <sys/types.h>
60#include <time.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	2	/* How many iterations of TIME_INTERVAL */
67
68char *TCID = "cpu_controller_test06";
69int TST_TOTAL = 3;
70pid_t scriptpid;
71char path[] = "/dev/cpuctl";
72extern void cleanup(void)
73{
74	kill(scriptpid, SIGUSR1);	/* Inform the shell to do cleanup */
75	/* Report exit status */
76}
77
78volatile int timer_expired = 0;
79
80int main(int argc, char *argv[])
81{
82
83	int test_num, task_num, len, num_cpus;
84	char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
85	char mysharesfile[FILENAME_MAX], ch;
86	/* Following variables are to capture parameters from script */
87	char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
88	char *test_num_p, *task_num_p;
89	pid_t pid;
90	gid_t mygroup_num;	/* A number attached with a group */
91	int fd;			/* to open a fifo to synchronize */
92	int counter = 0;	/* To take n number of readings */
93	double total_cpu_time,	/* Accumulated cpu time */
94	 delta_cpu_time,	/* Time the task could run on cpu(s) */
95	 prev_cpu_time = 0;
96	double exp_cpu_time;	/* Exp time in % by shares calculation */
97
98	struct rusage cpu_usage;
99	time_t current_time, prev_time, delta_time;
100	unsigned int fmyshares, num_tasks;
101	struct sigaction newaction, oldaction;
102
103	mygroup_num = -1;
104	num_cpus = 0;
105	task_num = 0;
106	test_num = 0;
107
108	/* Signal handling for alarm */
109	sigemptyset(&newaction.sa_mask);
110	newaction.sa_handler = signal_handler_alarm;
111	newaction.sa_flags = 0;
112	sigaction(SIGALRM, &newaction, &oldaction);
113
114	/* Collect the parameters passed by the script */
115	group_num_p = getenv("GROUP_NUM");
116	mygroup_p = getenv("MYGROUP");
117	script_pid_p = getenv("SCRIPT_PID");
118	num_cpus_p = getenv("NUM_CPUS");
119	test_num_p = getenv("TEST_NUM");
120	task_num_p = getenv("TASK_NUM");
121	/* Check if all of them are valid */
122	if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 8) &&
123				     ((test_num = atoi(test_num_p)) >= 6))) {
124		if ((group_num_p != NULL) && (mygroup_p != NULL) &&
125		    (script_pid_p != NULL) && (num_cpus_p != NULL) &&
126		    (task_num_p != NULL)) {
127			mygroup_num = atoi(group_num_p);
128			scriptpid = atoi(script_pid_p);
129			num_cpus = atoi(num_cpus_p);
130			task_num = atoi(task_num_p);
131			sprintf(mygroup, "%s", mygroup_p);
132		} else {
133			tst_brkm(TBROK, cleanup,
134				 "Invalid other input parameters\n");
135		}
136	} else {
137		tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
138	}
139
140	sprintf(mytaskfile, "%s", mygroup);
141	sprintf(mysharesfile, "%s", mygroup);
142	strcat(mytaskfile, "/tasks");
143	strcat(mysharesfile, "/cpu.shares");
144	pid = getpid();
145	write_to_file(mytaskfile, "a", pid);	/* Assign task to it's group */
146
147	fd = open("./myfifo", 0);
148	if (fd == -1)
149		tst_brkm(TBROK, cleanup, "Could not open fifo synchronize");
150
151	read(fd, &ch, 1);	/* Block task here to synchronize */
152
153	/*
154	 * We need not calculate the expected % cpu time of this task, as
155	 * neither it is required nor it can be predicted as there are idle
156	 * system tasks (and others too) in this group.
157	 */
158	FLAG = 0;
159	total_shares = 0;
160	shares_pointer = &total_shares;
161	len = strlen(path);
162	if (!strncpy(fullpath, path, len))
163		tst_brkm(TBROK, cleanup,
164			 "Could not copy directory path %s ", path);
165
166	if (scan_shares_files(shares_pointer) != 0)
167		tst_brkm(TBROK, cleanup,
168			 "From function scan_shares_files in %s ", fullpath);
169
170	/* return val -1 in case of function error, else 2 is min share value */
171	if ((fmyshares = read_shares_file(mysharesfile)) < 2)
172		tst_brkm(TBROK, cleanup,
173			 "in reading shares files  %s ", mysharesfile);
174
175	if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
176		tst_brkm(TBROK, cleanup,
177			 "in reading tasks files  %s ", mytaskfile);
178
179	exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
180
181	prev_time = time(NULL);	/* Note down the time */
182
183	while (1) {
184		/*
185		 * Need to run some cpu intensive task, which also
186		 * frequently checks the timer value
187		 */
188		double f = 274.345, mytime;	/*just a float number for sqrt */
189		alarm(TIME_INTERVAL);
190		timer_expired = 0;
191		/*
192		 * Let the task run on cpu for TIME_INTERVAL. Time of this
193		 * operation should not be high otherwise we can exceed the
194		 * TIME_INTERVAL to measure cpu usage
195		 */
196		while (!timer_expired)
197			f = sqrt(f * f);
198
199		current_time = time(NULL);
200		/* Duration in case its not exact TIME_INTERVAL */
201		delta_time = current_time - prev_time;
202
203		getrusage(0, &cpu_usage);
204		/* total_cpu_time = total user time + total sys time */
205		total_cpu_time = (cpu_usage.ru_utime.tv_sec +
206				  cpu_usage.ru_utime.tv_usec * 1e-6 +
207				  cpu_usage.ru_stime.tv_sec +
208				  cpu_usage.ru_stime.tv_usec * 1e-6);
209		delta_cpu_time = total_cpu_time - prev_cpu_time;
210
211		prev_cpu_time = total_cpu_time;
212		prev_time = current_time;
213
214		/* calculate % cpu time each task gets */
215		if (delta_time > TIME_INTERVAL)
216			mytime = (delta_cpu_time * 100) /
217			    (delta_time * num_cpus);
218		else
219			mytime = (delta_cpu_time * 100) /
220			    (TIME_INTERVAL * num_cpus);
221
222		/* No neeed to print the results */
223		fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)"
224			" i.e. %6.2f(%%) exp:-%6.2f(%%)} in %lu (s)\n",
225			mygroup_num, task_num, delta_cpu_time, mytime,
226			exp_cpu_time, delta_time);
227
228		counter++;
229
230		if (counter >= NUM_INTERVALS) {
231			switch (test_num) {
232			case 6:	/* Test 06 */
233			case 7:	/* Test 07 */
234			case 8:	/* Test 08 */
235				exit(0);	/* This task is done */
236				break;
237			default:
238				tst_brkm(TBROK, cleanup,
239					 "Invalid test num passed\n");
240				break;
241
242			}	/* end switch */
243		}		/* end if */
244	}			/* end while */
245}				/* end main */
246