This patch adds a binary which will be running as a default task for testcases
1 to create an ideal scenario.
Signed-off-by: Sudhir Kumar <[EMAIL PROTECTED]>
Index: ltp-full-20081031/testcases/kernel/controllers/cpuctl/cpuctl_def_task01.c
===================================================================
--- /dev/null
+++ ltp-full-20081031/testcases/kernel/controllers/cpuctl/cpuctl_def_task01.c
@@ -0,0 +1,235 @@
+/******************************************************************************/
+/*
*/
+/* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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*/
+/*
*/
+/* Total Tests: 1
*/
+/*
*/
+/* Test Name: cpu_controller_tests
*/
+/*
*/
+/* Test Assertion
*/
+/* Please refer to the file cpuctl_testplan.txt
*/
+/*
*/
+/* Author: Sudhir Kumar [EMAIL PROTECTED] */
+/*
*/
+/* History:
*/
+/* Created- 14/11/2008 -Sudhir Kumar <[EMAIL PROTECTED]> */
+/*
*/
+/******************************************************************************/
+
+/* Standard Include Files */
+#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*/
+
+
+#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*/
+
+extern int Tst_count;
+char *TCID = "cpu_controller_tests";
+int TST_TOTAL = 1;
+pid_t scriptpid;
+char path[FILENAME_MAX] = "/dev/cpuctl";
+
+extern void cleanup()
+{
+ kill(scriptpid, SIGUSR1);/* Inform the shell to do cleanup*/
+ tst_exit(); /* Report exit status*/
+}
+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*/
+ fd, /* To open a fifo for synchronization*/
+ first_counter = 0, /* To take n number of readings*/
+ second_counter = 0; /* no of times shares have changed*/
+ double total_cpu_time, /* Accumulated cpu time*/
+ delta_cpu_time, /* Time the task could run on cpu(s)*/
+ 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;
+ unsigned int fmyshares, num_tasks;
+ struct sigaction newaction, oldaction;
+
+ /* 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
+ 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 = open("./myfifo", 0);
+ if (fd == -1)
+ tst_brkm(TBROK, cleanup, "Could not open fifo to synchronizae");
+
+ 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*/
+ myshares = MULTIPLIER * myshares;
+ write_to_file(mysharesfile, "w", myshares);
+
+ }/* end if*/
+ }/* end while*/
+}/* end main*/
+
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