cpuctl_latency_test.c revision 4548c6cf9bcdd96d8303caa4130ab638b61f8a30 
1/******************************************************************************/
2/*                                                                            */
3/* Copyright (c) International Business Machines  Corp., 2008                 */
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_latency_test.c                                         */
24/*                                                                            */
25/* Description: This is a c program that runs a task which tries to keep cpu  */
26/*              busy in doing some calculations. The task will be used to     */
27/*              check the latency under group scheduling.                     */
28/*              The file is to be used by script                              */
29/*                                                                            */
30/* Total Tests: 2                                                             */
31/*                                                                            */
32/* Test Name:   cpu_controller_latency_tests                                  */
33/*                                                                            */
34/* Test Assertion                                                             */
35/*              Please refer to the file cpuctl_testplan.txt                  */
36/*                                                                            */
37/* Author:      Sudhir Kumar skumar@linux.vnet.ibm.com                        */
38/*                                                                            */
39/* History:                                                                   */
40/* Created-     26/11/2008 -Sudhir Kumar <skumar@linux.vnet.ibm.com>          */
41/*                                                                            */
42/******************************************************************************/
43
44#include <errno.h>
45#include <err.h>
46#include <signal.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <unistd.h>
51
52#include "../libcontrollers/libcontrollers.h"
53
54char *TCID = "cpu_controller_latency_tests";
55int TST_TOTAL = 2;
56
57void sighandler(int i)
58{
59	exit(0);
60}
61
62int main(int argc, char *argv[])
63{
64	char mytaskfile[FILENAME_MAX];
65	int test_num;
66
67	struct sigaction newaction, oldaction;
68
69	/* TODO (garrcoop): add error handling. */
70	sigemptyset(&newaction.sa_mask);
71	sigaddset(&newaction.sa_mask, SIGUSR1);
72	newaction.sa_handler = &sighandler;
73	sigaction(SIGUSR1, &newaction, &oldaction);
74
75	if (argc < 2 || argc > 3) {
76		errx(EINVAL, "TBROK\t Invalid #args received from script"
77			" The test will run without any cpu load");
78	}
79
80	/* Migrate the task to its group if applicable */
81	test_num = atoi(argv[1]);
82	if (test_num < 0) {
83		errx(EINVAL,
84		    "Invalid test number received from script. "
85		    "Skipping load creation");
86	}
87
88	if (test_num == 2) {
89		strncpy(mytaskfile, argv[2], FILENAME_MAX);
90		strncat(mytaskfile, "/tasks",
91					 FILENAME_MAX - strlen(mytaskfile) - 1);
92		write_to_file(mytaskfile, "a", getpid());
93	}
94
95	while (1) ;
96
97	return 0;
98}
99