/******************************************************************************/
/* */
/* Copyright (c) International Business Machines Corp., 2007 */
/* */
/* This program is free software; you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation; either version 2 of the License, or */
/* (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
/* the GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
/* */
/******************************************************************************/
/******************************************************************************/
/* */
/* File: cpuctl_task_def01.c */
/* */
/* Description: This is a c program that runs as a default task in a default */
/* group to create an ideal scenario. In this default group all */
/* the system tasks will be running along with this spinning task*/
/* The file is to be used by tests 1-3. */
/* */
/* Total Tests: 1 */
/* */
/* Test Name: cpu_controller_tests */
/* */
/* Test Assertion */
/* Please refer to the file cpuctl_testplan.txt */
/* */
/* Author: Sudhir Kumar skumar@linux.vnet.ibm.com */
/* */
/* History: */
/* Created- 14/11/2008 -Sudhir Kumar <skumar@linux.vnet.ibm.com> */
/* */
/******************************************************************************/
#include <unistd.h>
#include <math.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include "../libcontrollers/libcontrollers.h"
#include "test.h" /* LTP harness APIs */
#include "safe_macros.h"
#ifdef DEBUG
#define dbg(x...) printf(x);
#else
#define dbg(x...) do {} while (0)
#endif
#define TIME_INTERVAL 30 /* Time interval in seconds */
#define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */
#define NUM_SETS 4 /* How many share values (with same ratio) */
#define MULTIPLIER 10 /* Rate at which share value gets multiplied */
char *TCID = "cpu_controller_tests";
int TST_TOTAL = 1;
pid_t scriptpid;
char path[FILENAME_MAX] = "/dev/cpuctl";
extern void cleanup(void)
{
kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
/* Report exit status */
}
volatile int timer_expired = 0;
int main(int argc, char *argv[])
{
int num_cpus, test_num, len; /* Total time = TIME_INTERVAL*num_cpus */
char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
char mysharesfile[FILENAME_MAX], ch;
pid_t pid;
int my_group_num; /* A number attached with a group */
int fd; /* To open a fifo for synchronization */
int first_counter = 0; /* To take n number of readings */
int second_counter = 0; /* no of times shares have changed */
double total_cpu_time; /* Accumulated cpu time */
double delta_cpu_time; /* Time the task could run on cpu(s) */
double prev_cpu_time = 0;
double exp_cpu_time; /* Exp time in % by shares calculation */
struct rusage cpu_usage;
time_t current_time, prev_time, delta_time;
unsigned long int myshares = 2, baseshares = 1000;
unsigned int fmyshares, num_tasks;
struct sigaction newaction, oldaction;
num_cpus = 0;
test_num = 0;
my_group_num = -1;
/* Signal handling for alarm */
sigemptyset(&newaction.sa_mask);
newaction.sa_handler = signal_handler_alarm;
newaction.sa_flags = 0;
sigaction(SIGALRM, &newaction, &oldaction);
/* Check if all parameters passed are correct */
if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) ||
((scriptpid = atoi(argv[3])) <= 0) ||
((num_cpus = atoi(argv[4])) <= 0) ||
(test_num = atoi(argv[5])) <= 0)
tst_brkm(TBROK, cleanup, "Invalid input parameters\n");
if (test_num == 1)
myshares *= my_group_num;
else if (test_num == 3)
myshares = baseshares;
else
tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.\n");
sprintf(mygroup, "%s", argv[2]);
sprintf(mytaskfile, "%s", mygroup);
sprintf(mysharesfile, "%s", mygroup);
strcat(mytaskfile, "/tasks");
strcat(mysharesfile, "/cpu.shares");
pid = getpid();
write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */
write_to_file(mysharesfile, "w", myshares);
dbg("Default task's initial shares = %u", myshares);
fd = SAFE_OPEN(cleanup, "./myfifo", 0);
read(fd, &ch, 1); /* To fire all the tasks up at the same time */
/*
* We need not calculate the expected % cpu time of this task, as
* neither it is required nor it can be predicted as there are idle
* system tasks (and others too) in this group.
*/
FLAG = 0;
total_shares = 0;
shares_pointer = &total_shares;
len = strlen(path);
if (!strncpy(fullpath, path, len))
tst_brkm(TBROK, cleanup,
"Could not copy directory path %s ", path);
if (scan_shares_files(shares_pointer) != 0)
tst_brkm(TBROK, cleanup,
"From function scan_shares_files in %s ", fullpath);
/* return val -1 in case of function error, else 2 is min share value */
if ((fmyshares = read_shares_file(mysharesfile)) < 2)
tst_brkm(TBROK, cleanup,
"in reading shares files %s ", mysharesfile);
if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
tst_brkm(TBROK, cleanup,
"in reading tasks files %s ", mytaskfile);
exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
prev_time = time(NULL); /* Note down the time */
while (1) {
/*
* Need to run some cpu intensive task, which also
* frequently checks the timer value
*/
double f = 274.345, mytime; /*just a float number for sqrt */
alarm(TIME_INTERVAL);
timer_expired = 0;
/*
* Let the task run on cpu for TIME_INTERVAL. Time of this
* operation should not be high otherwise we can exceed the
* TIME_INTERVAL to measure cpu usage
*/
while (!timer_expired)
f = sqrt(f * f);
current_time = time(NULL);
/* Duration in case its not exact TIME_INTERVAL */
delta_time = current_time - prev_time;
getrusage(0, &cpu_usage);
/* total_cpu_time = total user time + total sys time */
total_cpu_time = (cpu_usage.ru_utime.tv_sec +
cpu_usage.ru_utime.tv_usec * 1e-6 +
cpu_usage.ru_stime.tv_sec +
cpu_usage.ru_stime.tv_usec * 1e-6);
delta_cpu_time = total_cpu_time - prev_cpu_time;
prev_cpu_time = total_cpu_time;
prev_time = current_time;
/* calculate % cpu time each task gets */
if (delta_time > TIME_INTERVAL)
mytime = (delta_cpu_time * 100) /
(delta_time * num_cpus);
else
mytime = (delta_cpu_time * 100) /
(TIME_INTERVAL * num_cpus);
/*
* Lets print the results. The exp cpu time calculated may not
* be correct due to running system tasks at the moment
*/
fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)"
" i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)"
" in %lu (s) INTERVAL\n", delta_cpu_time, mytime,
exp_cpu_time, myshares, delta_time);
first_counter++;
/* Take n sets of readings for each shares value */
if (first_counter >= NUM_INTERVALS) {
first_counter = 0;
second_counter++;
if (second_counter >= NUM_SETS)
exit(0); /* This task is done */
/* Keep same ratio but change values */
if (test_num == 1) {
myshares = MULTIPLIER * myshares;
write_to_file(mysharesfile, "w", myshares);
}
/* No need to change shares for def task for test 3 */
} /* end if */
} /* end while */
} /* end main */