This patch adds a binary which will be running as a default task for testcases
4 and 5 to create an ideal scenario.
Signed-off-by: Sudhir Kumar <[EMAIL PROTECTED]>
---
testcases/kernel/controllers/cpuctl/cpuctl_def_task02.c | 255 ++++++++++++++++
1 file changed, 255 insertions(+)
Index: ltp-full-20081031/testcases/kernel/controllers/cpuctl/cpuctl_def_task02.c
===================================================================
--- /dev/null
+++ ltp-full-20081031/testcases/kernel/controllers/cpuctl/cpuctl_def_task02.c
@@ -0,0 +1,251 @@
+/******************************************************************************/
+/*
*/
+/* 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_def02.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 4-5.
*/
+/*
*/
+/* 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 [EMAIL PROTECTED] */
+/*
*/
+/* History:
*/
+/* Created- 18/11/2008 -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*/
+
+#define TIME_INTERVAL 30 /* Time interval in seconds*/
+#define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */
+
+extern int Tst_count;
+char *TCID = "cpu_controller_test04";
+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 timer_expired = 0;
+
+int main(int argc, char *argv[])
+{
+
+ int test_num, task_num, len, num_cpus;
+ 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;
+ char *test_num_p, *task_num_p;
+ pid_t pid;
+ int mygroup_num, /* A number attached with a group*/
+ fd, /* to open a fifo to synchronize*/
+ 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)*/
+ 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 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);
+
+ /* 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 task to it's group*/
+
+ fd = open("./myfifo", 0);
+ if (fd == -1)
+ tst_brkm(TBROK, cleanup,
+ "Could not open fifo for synchronization");
+
+ read(fd, &ch, 1); /* Block task here to synchronize */
+
+ /*
+ * 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 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);
+
+ fprintf(stdout, "Grp:-%3dDEF task-%3d: CPU TIME{calc:-%6.2f(s)"
+ "i.e. %6.2f(%%)exp:-%6.2f(%%)} with %u(shares) in %lu"
+ " (s)\n", mygroup_num, task_num, delta_cpu_time, mytime,
+ exp_cpu_time, fmyshares, delta_time);
+
+ counter++;
+
+ if (counter >= NUM_INTERVALS) {
+ switch (test_num) {
+ case 4: /* Test04 */
+ exit(0); /* This task is done its job*/
+ break;
+ case 5: /* Test 05 */
+ if (migrate == 0) {
+ counter = 0;
+ migrate = 1;
+ } else {
+ exit(0);
+ }
+ break;
+ default:
+ tst_brkm(TBROK, cleanup,
+ "Invalid test number passed\n");
+ break;
+
+ } /* end switch*/
+ }
+ } /* end while*/
+} /* end main*/
+
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