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 4-5.                          */
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-     18/11/2008 -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
61#include "../libcontrollers/libcontrollers.h"
62#include "test.h"		/* LTP harness APIs */
63#include "safe_macros.h"
64
65#define TIME_INTERVAL	30	/* Time interval in seconds */
66#define NUM_INTERVALS	3	/* How many iterations of TIME_INTERVAL */
67
68char *TCID = "cpu_controller_test04";
69int TST_TOTAL = 1;
70pid_t scriptpid;
71char path[] = "/dev/cpuctl";
72
73extern void cleanup(void)
74{
75	kill(scriptpid, SIGUSR1);	/* Inform the shell to do cleanup */
76	/* Report exit status */
77}
78
79volatile int timer_expired = 0;
80
81int main(int argc, char *argv[])
82{
83
84	int test_num;
85	int task_num;
86	int len;
87	int num_cpus;
88	int migrate = 0;	/* For task migration */
89	char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
90	char mysharesfile[FILENAME_MAX], ch;
91	/* Following variables are to capture parameters from script */
92	char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
93	char *test_num_p, *task_num_p;
94	pid_t pid;
95	gid_t mygroup_num;	/* A number attached with a group */
96	int fd;			/* to open a fifo to synchronize */
97	int counter = 0;	/* To take n number of readings */
98	double total_cpu_time;	/* Accumulated cpu time */
99	double delta_cpu_time;	/* Time the task could run on cpu(s) */
100	double prev_cpu_time = 0;
101	double exp_cpu_time;	/* Exp time in % by shares calculation */
102
103	struct rusage cpu_usage;
104	time_t current_time, prev_time, delta_time;
105	unsigned int fmyshares, num_tasks;
106	struct sigaction newaction, oldaction;
107
108	mygroup_num = -1;
109	num_cpus = 0;
110	task_num = 0;
111	test_num = 0;
112
113	/* Signal handling for alarm */
114	sigemptyset(&newaction.sa_mask);
115	newaction.sa_handler = signal_handler_alarm;
116	newaction.sa_flags = 0;
117	sigaction(SIGALRM, &newaction, &oldaction);
118
119	/* Collect the parameters passed by the script */
120	group_num_p = getenv("GROUP_NUM");
121	mygroup_p = getenv("MYGROUP");
122	script_pid_p = getenv("SCRIPT_PID");
123	num_cpus_p = getenv("NUM_CPUS");
124	test_num_p = getenv("TEST_NUM");
125	task_num_p = getenv("TASK_NUM");
126	/* Check if all of them are valid */
127	if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) == 4) ||
128				     ((test_num = atoi(test_num_p)) == 5))) {
129		if ((group_num_p != NULL) && (mygroup_p != NULL) &&
130		    (script_pid_p != NULL) && (num_cpus_p != NULL) &&
131		    (task_num_p != NULL)) {
132			mygroup_num = atoi(group_num_p);
133			scriptpid = atoi(script_pid_p);
134			num_cpus = atoi(num_cpus_p);
135			task_num = atoi(task_num_p);
136			sprintf(mygroup, "%s", mygroup_p);
137		} else {
138			tst_brkm(TBROK, cleanup,
139				 "Invalid other input parameters\n");
140		}
141	} else {
142		tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
143	}
144
145	sprintf(mytaskfile, "%s", mygroup);
146	sprintf(mysharesfile, "%s", mygroup);
147	strcat(mytaskfile, "/tasks");
148	strcat(mysharesfile, "/cpu.shares");
149	pid = getpid();
150	write_to_file(mytaskfile, "a", pid);	/* Assign task to it's group */
151
152	fd = SAFE_OPEN(cleanup, "./myfifo", 0);
153
154	read(fd, &ch, 1);	/* Block task here to synchronize */
155
156	/*
157	 * We now calculate the expected % cpu time of this task by getting
158	 * it's group's shares, the total shares of all the groups and the
159	 * number of tasks in this group.
160	 */
161	FLAG = 0;
162	total_shares = 0;
163	shares_pointer = &total_shares;
164	len = strlen(path);
165	if (!strncpy(fullpath, path, len))
166		tst_brkm(TBROK, cleanup,
167			 "Could not copy directory path %s ", path);
168
169	if (scan_shares_files(shares_pointer) != 0)
170		tst_brkm(TBROK, cleanup,
171			 "From function scan_shares_files in %s ", fullpath);
172
173	/* return val -1 in case of function error, else 2 is min share value */
174	if ((fmyshares = read_shares_file(mysharesfile)) < 2)
175		tst_brkm(TBROK, cleanup,
176			 "in reading shares files  %s ", mysharesfile);
177
178	if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
179		tst_brkm(TBROK, cleanup,
180			 "in reading tasks files  %s ", mytaskfile);
181
182	exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
183
184	prev_time = time(NULL);	/* Note down the time */
185
186	while (1) {
187		/*
188		 * Need to run some cpu intensive task, which also
189		 * frequently checks the timer value
190		 */
191		double f = 274.345, mytime;	/*just a float number for sqrt */
192		alarm(TIME_INTERVAL);
193		timer_expired = 0;
194		/*
195		 * Let the task run on cpu for TIME_INTERVAL. Time of this
196		 * operation should not be high otherwise we can exceed the
197		 * TIME_INTERVAL to measure cpu usage
198		 */
199		while (!timer_expired)
200			f = sqrt(f * f);
201
202		current_time = time(NULL);
203		/* Duration in case its not exact TIME_INTERVAL */
204		delta_time = current_time - prev_time;
205
206		getrusage(0, &cpu_usage);
207		/* total_cpu_time = total user time + total sys time */
208		total_cpu_time = (cpu_usage.ru_utime.tv_sec +
209				  cpu_usage.ru_utime.tv_usec * 1e-6 +
210				  cpu_usage.ru_stime.tv_sec +
211				  cpu_usage.ru_stime.tv_usec * 1e-6);
212		delta_cpu_time = total_cpu_time - prev_cpu_time;
213
214		prev_cpu_time = total_cpu_time;
215		prev_time = current_time;
216
217		/* calculate % cpu time each task gets */
218		if (delta_time > TIME_INTERVAL)
219			mytime = (delta_cpu_time * 100) /
220			    (delta_time * num_cpus);
221		else
222			mytime = (delta_cpu_time * 100) /
223			    (TIME_INTERVAL * num_cpus);
224
225		fprintf(stdout, "Grp:-%3dDEF task-%3d: CPU TIME{calc:-%6.2f(s)"
226			"i.e. %6.2f(%%)exp:-%6.2f(%%)} with %u(shares) in %lu"
227			" (s)\n", mygroup_num, task_num, delta_cpu_time, mytime,
228			exp_cpu_time, fmyshares, delta_time);
229
230		counter++;
231
232		if (counter >= NUM_INTERVALS) {
233			switch (test_num) {
234			case 4:	/* Test04 */
235				exit(0);	/* This task is done its job */
236				break;
237			case 5:	/* Test 05 */
238				if (migrate == 0) {
239					counter = 0;
240					migrate = 1;
241				} else {
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	}			/* end while */
253}				/* end main */
254