cpuctl_def_task01.c revision f600923885d241656bc95feb772962c5596fef4a 
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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/* Standard Include Files */
45#include <unistd.h>
46#include <math.h>
47#include <signal.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <sys/resource.h>
52#include <sys/syscall.h>
53#include <sys/time.h>
54#include <sys/types.h>
55#include <sys/stat.h>
56#include <fcntl.h>
57#include <time.h>
58#include <unistd.h>
59
60#include "../libcontrollers/libcontrollers.h"
61#include "test.h"		/* LTP harness APIs*/
62
63#ifdef DEBUG
64#define dbg(x...)	printf(x);
65#else
66#define dbg(x...)	do {}	while (0)
67#endif
68
69#define TIME_INTERVAL	30	/* Time interval in seconds*/
70#define NUM_INTERVALS	3       /* How many iterations of TIME_INTERVAL */
71#define NUM_SETS	4	/* How many share values (with same ratio)*/
72#define MULTIPLIER   	10      /* Rate at which share value gets multiplied*/
73
74extern int Tst_count;
75char *TCID = "cpu_controller_tests";
76int TST_TOTAL = 1;
77pid_t scriptpid;
78char path[FILENAME_MAX] = "/dev/cpuctl";
79
80extern void cleanup()
81{
82	kill(scriptpid, SIGUSR1);/* Inform the shell to do cleanup*/
83	tst_exit();		/* Report exit status*/
84}
85int timer_expired = 0;
86
87int main(int argc, char *argv[])
88{
89
90	int num_cpus, test_num, len;	/* Total time = TIME_INTERVAL*num_cpus*/
91	char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
92	char mysharesfile[FILENAME_MAX], ch;
93	pid_t pid;
94	int my_group_num,	        /* A number attached with a group*/
95		fd,          	        /* To open a fifo for synchronization*/
96		first_counter = 0,  	/* To take n number of readings*/
97		second_counter = 0;    	/* no of times shares have changed*/
98	double total_cpu_time,  	/* Accumulated cpu time*/
99		delta_cpu_time,  	/* Time the task could run on cpu(s)*/
100		prev_cpu_time = 0;
101	double exp_cpu_time;		/* Exp time in % by shares calculation*/
102	struct rusage cpu_usage;
103	time_t current_time, prev_time, delta_time;
104	unsigned long int myshares = 2, baseshares = 1000;
105	unsigned int fmyshares, num_tasks;
106	struct sigaction newaction, oldaction;
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	/* Check if all parameters passed are correct*/
115	if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) || \
116				((scriptpid = atoi(argv[3])) <= 0) || \
117					((num_cpus = atoi(argv[4])) <= 0) || \
118						(test_num = atoi(argv[5])) <= 0)
119		tst_brkm(TBROK, cleanup, "Invalid input parameters\n");
120
121	if (test_num == 1)
122		myshares *= my_group_num;
123	else if (test_num == 3)
124		myshares = baseshares;
125	else
126		tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.\n");
127
128	sprintf(mygroup, "%s", argv[2]);
129	sprintf(mytaskfile, "%s", mygroup);
130	sprintf(mysharesfile, "%s", mygroup);
131	strcat(mytaskfile, "/tasks");
132	strcat(mysharesfile, "/cpu.shares");
133	pid = getpid();
134	write_to_file(mytaskfile, "a", pid);    /* Assign task to it's group*/
135	write_to_file(mysharesfile, "w", myshares);
136	dbg("Default task's initial shares = %u", myshares);
137
138	fd = open("./myfifo", 0);
139	if (fd == -1)
140		tst_brkm(TBROK, cleanup, "Could not open fifo to synchronizae");
141
142	read(fd, &ch, 1);	/* To fire all the tasks up at the same time*/
143
144	/*
145	 * We need not calculate the expected % cpu time of this task, as
146	 * neither it is required nor it can be predicted as there are idle
147	 * system tasks (and others too) in this group.
148	 */
149	FLAG = 0;
150	total_shares = 0;
151	shares_pointer = &total_shares;
152	len = strlen(path);
153	if (!strncpy(fullpath, path, len))
154		tst_brkm(TBROK, cleanup,
155			 "Could not copy directory path %s ", path);
156
157	if (scan_shares_files(shares_pointer) != 0)
158		tst_brkm(TBROK, cleanup,
159		 "From function scan_shares_files in %s ", fullpath);
160
161	/* return val -1 in case of function error, else 2 is min share value */
162	if ((fmyshares = read_shares_file(mysharesfile)) < 2)
163		tst_brkm(TBROK, cleanup,
164			 "in reading shares files  %s ", mysharesfile);
165
166	if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
167		tst_brkm(TBROK, cleanup,
168			 "in reading tasks files  %s ", mytaskfile);
169
170	exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
171
172	prev_time = time(NULL);	 /* Note down the time*/
173
174	while (1) {
175		/*
176		 * Need to run some cpu intensive task, which also
177		 * frequently checks the timer value
178		 */
179		double f = 274.345, mytime;	/*just a float number for sqrt*/
180		alarm(TIME_INTERVAL);
181		timer_expired = 0;
182		/*
183		 * Let the task run on cpu for TIME_INTERVAL. Time of this
184		 * operation should not be high otherwise we can exceed the
185		 * TIME_INTERVAL to measure cpu usage
186		 */
187		while (!timer_expired)
188			f = sqrt(f * f);
189
190		current_time = time(NULL);
191		/* Duration in case its not exact TIME_INTERVAL*/
192		delta_time = current_time - prev_time;
193
194		getrusage(0, &cpu_usage);
195		/* total_cpu_time = total user time + total sys time */
196		total_cpu_time = (cpu_usage.ru_utime.tv_sec +
197				cpu_usage.ru_utime.tv_usec * 1e-6 +
198				cpu_usage.ru_stime.tv_sec +
199				cpu_usage.ru_stime.tv_usec * 1e-6) ;
200		delta_cpu_time = total_cpu_time - prev_cpu_time;
201
202		prev_cpu_time = total_cpu_time;
203		prev_time = current_time;
204
205		/* calculate % cpu time each task gets */
206		if (delta_time > TIME_INTERVAL)
207			mytime = (delta_cpu_time * 100) /
208					 (delta_time * num_cpus);
209		else
210			mytime = (delta_cpu_time * 100) /
211					 (TIME_INTERVAL * num_cpus);
212
213		/*
214		 * Lets print the results. The exp cpu time calculated may not
215		 * be correct due to running system tasks at the moment
216		 */
217		fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)"
218			" i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)"
219			" in %lu (s) INTERVAL\n", delta_cpu_time,  mytime,
220					 exp_cpu_time, myshares, delta_time);
221		first_counter++;
222
223		/* Take n sets of readings for each shares value*/
224		if (first_counter >= NUM_INTERVALS) {
225			first_counter = 0;
226			second_counter++;
227			if (second_counter >= NUM_SETS)
228				exit(0);	/* This task is done */
229
230			/* Keep same ratio but change values*/
231			if (test_num == 1) {
232				myshares = MULTIPLIER * myshares;
233				write_to_file(mysharesfile, "w", myshares);
234			}
235			 /* No need to change shares for def task for test 3 */
236
237		}/* end if*/
238	}/* end while*/
239}/* end main*/
240
241