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_def04.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 9-10.                         */
29/*                                                                            */
30/* Total Tests: 2                                                             */
31/*                                                                            */
32/* Test 09:     Heavy stress test with nice value change                      */
33/* Test 10:     Heavy stress test (effect of heavy group on light group)      */
34/*                                                                            */
35/* Test Name:   cpu_controller_test 9,10                                      */
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-     20/11/2008 -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/stat.h>
56#include <fcntl.h>
57#include <sys/time.h>
58#include <sys/types.h>
59#include <time.h>
60#include <unistd.h>
61
62#include "../libcontrollers/libcontrollers.h"
63#include "test.h"		/* LTP harness APIs */
64
65#define TIME_INTERVAL	100	/* Time interval in seconds */
66#define NUM_INTERVALS	2	/* How many iterations of TIME_INTERVAL */
67
68char *TCID = "cpu_controller_test06";
69int TST_TOTAL = 2;
70pid_t scriptpid;
71char path[] = "/dev/cpuctl";
72extern void cleanup()
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;
84	int task_num;
85	int len;
86	int num_cpus;
87	char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
88	char mysharesfile[FILENAME_MAX], ch;
89	/* Following variables are to capture parameters from script */
90	char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p;
91	char *test_num_p, *task_num_p;
92	gid_t mygroup_num;	/* A number attached with a group */
93	int fd;			/* to open a fifo to synchronize */
94	int counter = 0;	/* To take n number of readings */
95	double total_cpu_time;	/* Accumulated cpu time */
96	double delta_cpu_time;	/* Time the task could run on cpu(s) */
97	double prev_cpu_time = 0;
98	double exp_cpu_time;	/* Exp time in % by shares calculation */
99
100	struct rusage cpu_usage;
101	time_t current_time, prev_time, delta_time;
102	unsigned int fmyshares, num_tasks;
103	unsigned int mygroup_shares;
104	struct sigaction newaction, oldaction;
105
106	mygroup_num = -1;
107	num_cpus = 0;
108	task_num = 0;
109	test_num = 0;
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	/* Collect the parameters passed by the script */
118	group_num_p = getenv("GROUP_NUM");
119	mygroup_p = getenv("MYGROUP");
120	script_pid_p = getenv("SCRIPT_PID");
121	num_cpus_p = getenv("NUM_CPUS");
122	test_num_p = getenv("TEST_NUM");
123	task_num_p = getenv("TASK_NUM");
124	/* Check if all of them are valid */
125	if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 10) &&
126				     ((test_num = atoi(test_num_p)) >= 9))) {
127		if ((group_num_p != NULL) && (mygroup_p != NULL) &&
128		    (script_pid_p != NULL) && (num_cpus_p != NULL) &&
129		    (task_num_p != NULL)) {
130			mygroup_num = atoi(group_num_p);
131			scriptpid = atoi(script_pid_p);
132			num_cpus = atoi(num_cpus_p);
133			task_num = atoi(task_num_p);
134			sprintf(mygroup, "%s", mygroup_p);
135		} else {
136			tst_brkm(TBROK, cleanup,
137				 "Invalid other input parameters\n");
138		}
139	} else {
140		tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
141	}
142
143	sprintf(mytaskfile, "%s", mygroup);
144	sprintf(mysharesfile, "%s", mygroup);
145	strcat(mytaskfile, "/tasks");
146	strcat(mysharesfile, "/cpu.shares");
147
148	write_to_file(mytaskfile, "a", getpid());
149
150	/*
151	 * Let us give the default group 100 shares, as other groups will have
152	 * a multiple of 100 shares.
153	 */
154	mygroup_shares = 100;
155	write_to_file(mysharesfile, "w", mygroup_shares);
156
157	fd = open("./myfifo", 0);
158	if (fd == -1)
159		tst_brkm(TBROK, cleanup, "Could not open fifo synchronize");
160
161	read(fd, &ch, 1);	/* Block task here to synchronize */
162
163	/*
164	 * We need not calculate the expected % cpu time of this task, as
165	 * neither it is required nor it can be predicted as there are idle
166	 * system tasks (and others too) in this group.
167	 */
168	FLAG = 0;
169	total_shares = 0;
170	shares_pointer = &total_shares;
171	len = strlen(path);
172	if (!strncpy(fullpath, path, len))
173		tst_brkm(TBROK, cleanup,
174			 "Could not copy directory path %s ", path);
175
176	if (scan_shares_files(shares_pointer) != 0)
177		tst_brkm(TBROK, cleanup,
178			 "From function scan_shares_files in %s ", fullpath);
179
180	/* return val -1 in case of function error, else 2 is min share value */
181	if ((fmyshares = read_shares_file(mysharesfile)) < 2)
182		tst_brkm(TBROK, cleanup,
183			 "in reading shares files  %s ", mysharesfile);
184
185	if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
186		tst_brkm(TBROK, cleanup,
187			 "in reading tasks files  %s ", mytaskfile);
188
189	exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
190
191	prev_time = time(NULL);	/* Note down the time */
192
193	while (1) {
194		/*
195		 * Need to run some cpu intensive task, which also
196		 * frequently checks the timer value
197		 */
198		double f = 274.345, mytime;	/*just a float number for sqrt */
199		alarm(TIME_INTERVAL);
200		timer_expired = 0;
201		/*
202		 * Let the task run on cpu for TIME_INTERVAL. Time of this
203		 * operation should not be high otherwise we can exceed the
204		 * TIME_INTERVAL to measure cpu usage
205		 */
206		while (!timer_expired)
207			f = sqrt(f * f);
208
209		current_time = time(NULL);
210		/* Duration in case its not exact TIME_INTERVAL */
211		delta_time = current_time - prev_time;
212
213		getrusage(0, &cpu_usage);
214		/* total_cpu_time = total user time + total sys time */
215		total_cpu_time = (cpu_usage.ru_utime.tv_sec +
216				  cpu_usage.ru_utime.tv_usec * 1e-6 +
217				  cpu_usage.ru_stime.tv_sec +
218				  cpu_usage.ru_stime.tv_usec * 1e-6);
219		delta_cpu_time = total_cpu_time - prev_cpu_time;
220
221		prev_cpu_time = total_cpu_time;
222		prev_time = current_time;
223
224		/* calculate % cpu time each task gets */
225		if (delta_time > TIME_INTERVAL)
226			mytime = (delta_cpu_time * 100) /
227			    (delta_time * num_cpus);
228		else
229			mytime = (delta_cpu_time * 100) /
230			    (TIME_INTERVAL * num_cpus);
231
232		/* No neeed to print the results */
233		fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s) i.e."
234			"  %6.2f(%%) exp:-%6.2f(%%)} with %3u shares in %lu (s)"
235			" INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
236			mytime, exp_cpu_time, fmyshares, delta_time);
237
238		counter++;
239
240		if (counter >= NUM_INTERVALS) {
241			switch (test_num) {
242
243			case 9:	/* Test 09 */
244			case 10:	/* Test 10 */
245				exit(0);	/* This task is done */
246				break;
247			default:
248				tst_brkm(TBROK, cleanup,
249					 "Invalid test number passed\n");
250				break;
251
252			}	/* end switch */
253		}		/* end if */
254	}			/* end while */
255}				/* end main */
256