/******************************************************************************/
/* */
/* 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_test02.c */
/* */
/* Description: This is a c program that tests the cpucontroller fairness of */
/* scheduling the tasks according to their group shares. This */
/* testcase tests the ability of the cpu controller to provide */
/* fairness for share values (absolute). */
/* */
/* Total Tests: 2 */
/* */
/* Test 04: Nice value effect on group scheduling */
/* Test 05: Task migration test */
/* */
/* Test Name: cpu_controller_test02 */
/* */
/* Test Assertion */
/* Please refer to the file cpuctl_testplan.txt */
/* */
/* Author: Sudhir Kumar skumar@linux.vnet.ibm.com */
/* */
/* History: */
/* Created- 20/12/2007 -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 <unistd.h>
#include "../libcontrollers/libcontrollers.h"
#include "test.h" /* LTP harness APIs */
#include "safe_macros.h"
#define TIME_INTERVAL 30 /* Time interval in seconds */
#define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */
char *TCID = "cpuctl_test02";
int TST_TOTAL = 1;
pid_t scriptpid;
char path[] = "/dev/cpuctl";
extern void cleanup()
{
kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
tst_exit(); /* Report exit status */
}
int migrate_task();
volatile int timer_expired = 0;
int main(int argc, char *argv[])
{
int test_num;
int task_num;
int len;
int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */
int migrate = 0; /* For task migration */
char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
char mysharesfile[FILENAME_MAX], ch;
/* Following variables are to capture parameters from script */
char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p,
*task_num_p;
pid_t pid;
gid_t mygroup_num; /* A number attached with a group */
int fd; /* A descriptor to open a fifo for synchronized start */
int counter = 0; /* To take n number of readings */
double total_cpu_time, /* Accumulated cpu time */
delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */
prev_cpu_time = 0;
double exp_cpu_time; /* Expected time in % as obtained by shares calculation */
struct rusage cpu_usage;
time_t current_time, prev_time, delta_time;
unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */
struct sigaction newaction, oldaction;
mygroup_num = -1;
num_cpus = 0;
task_num = 0;
test_num = 0;
/* Signal handling for alarm */
sigemptyset(&newaction.sa_mask);
newaction.sa_handler = signal_handler_alarm;
newaction.sa_flags = 0;
sigaction(SIGALRM, &newaction, &oldaction);
/* Collect the parameters passed by the script */
group_num_p = getenv("GROUP_NUM");
mygroup_p = getenv("MYGROUP");
script_pid_p = getenv("SCRIPT_PID");
num_cpus_p = getenv("NUM_CPUS");
test_num_p = getenv("TEST_NUM");
task_num_p = getenv("TASK_NUM");
/* Check if all of them are valid */
if ((test_num_p != NULL)
&& (((test_num = atoi(test_num_p)) == 4)
|| ((test_num = atoi(test_num_p)) == 5))) {
if ((group_num_p != NULL) && (mygroup_p != NULL)
&& (script_pid_p != NULL) && (num_cpus_p != NULL)
&& (task_num_p != NULL)) {
mygroup_num = atoi(group_num_p);
scriptpid = atoi(script_pid_p);
num_cpus = atoi(num_cpus_p);
task_num = atoi(task_num_p);
sprintf(mygroup, "%s", mygroup_p);
} else {
tst_brkm(TBROK, cleanup,
"Invalid other input parameters\n");
}
} else {
tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
}
sprintf(mytaskfile, "%s", mygroup);
sprintf(mysharesfile, "%s", mygroup);
strcat(mytaskfile, "/tasks");
strcat(mysharesfile, "/cpu.shares");
pid = getpid();
write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */
fd = SAFE_OPEN(cleanup, "./myfifo", 0);
read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */
/*
* We now calculate the expected % cpu time of this task by getting
* it's group's shares, the total shares of all the groups and the
* number of tasks 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 to take sqrt */
alarm(TIME_INTERVAL);
timer_expired = 0;
while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */
f = sqrt(f * f); /* Time of this operation should not be high otherwise we can
* exceed the TIME_INTERVAL to measure cpu usage
*/
current_time = time(NULL);
delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */
getrusage(0, &cpu_usage);
total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */
cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */
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);
fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%)exp:-%6.2f(%%)}\
with %u(shares) in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
mytime, exp_cpu_time, fmyshares, delta_time);
counter++;
if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */
switch (test_num) {
case 4: /* Test04 */
exit(0); /* This task is done with its job */
break;
case 5: /* Test 05 */
if (migrate == 0) {
counter = 0;
fprintf(stdout,
"FIRST RUN COMPLETED FOR TASK %d\n",
task_num);
migrate = 1;
} else {
fprintf(stdout,
"SECOND RUN COMPLETED FOR TASK %d\n",
task_num);
exit(0);
}
break;
default:
tst_brkm(TBROK, cleanup,
"Invalid test number passed\n");
break;
} /* end switch */
}
if ((migrate == 1) && (counter == 0)) {
if (task_num == 1) {
if (migrate_task() != 0)
tst_brkm(TFAIL, cleanup,
"Could not migrate task 1 ");
else
fprintf(stdout,
"TASK 1 MIGRATED FROM GROUP 1 TO GROUP 2\n");
strcpy(mytaskfile, "/dev/cpuctl/group_2/tasks");
}
/*
* Read the shares files and again calculate the cpu fraction
* In test 2(case 4) we need to read tasks file as we migrate task
* Q?? How to ensure other tasks do not read before task 1 migration
*/
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);
}
} /* end while */
} /* end main */
int migrate_task()
{
char target[32] = "/dev/cpuctl/group_2/tasks"; /* Hard coding..Will try dynamic */
pid_t pid = getpid();
return (write_to_file(target, "a", pid));
}