The patch adds a binary to be run as the latency check task.
Signed-off-by: Sudhir Kumar <[EMAIL PROTECTED]>
Index:
ltp-full-20081130/testcases/kernel/controllers/cpuctl/cpuctl_latency_check_task.c
===================================================================
--- /dev/null
+++
ltp-full-20081130/testcases/kernel/controllers/cpuctl/cpuctl_latency_check_task.c
@@ -0,0 +1,156 @@
+/******************************************************************************/
+/*
*/
+/* Copyright (c) International Business Machines Corp., 2008
*/
+/*
*/
+/* 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_latency_check_task.c
*/
+/*
*/
+/* Description: This is a c program that runs a task which does frequent
sleep*/
+/* on a busy machine and checks if there is any added latency
*/
+/* The file is to be used by script
*/
+/*
*/
+/* Total Tests: 1
*/
+/*
*/
+/* Test Name: cpu_controller_latency_tests
*/
+/*
*/
+/* Test Assertion
*/
+/* Please refer to the file cpuctl_testplan.txt
*/
+/*
*/
+/* Author: Sudhir Kumar [EMAIL PROTECTED] */
+/*
*/
+/* History:
*/
+/* Created- 26/11/2008 -Sudhir Kumar <[EMAIL PROTECTED]> */
+/*
*/
+/******************************************************************************/
+
+#include <unistd.h>
+#include <math.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <string.h>
+
+#include "../libcontrollers/libcontrollers.h"
+
+/* #define VERBOSE 1 to print verbose output */
+
+#ifdef VERBOSE
+#define verbose(x...) printf(x)
+#else
+#define verbose(x...) do {} while (0);
+#endif
+
+#define NUM_TIMES 200 /* How many intervals you want to check*/
+#define INTERVALS 1 /* How many milliseconds interval in iterations*/
+#define USECONDS 1000 /* microseconds to sleep*/
+#define ALLOWED 5000 /* max latency allowed in us */
+
+extern int Tst_count;
+char *TCID = "cpuctl_latency_tests";
+int TST_COUNT = 1;
+int TST_TOTAL = 1;
+pid_t script_pid;
+
+extern void cleanup()
+{
+ exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+ int count, i = 0, iteration = 0;
+ int fail = 0;
+ char mytaskfile[FILENAME_MAX];
+ int test_num;
+ struct timeval prev_time, cur_time;
+ unsigned int actual, actual_s, actual_us, sleeptime;
+ unsigned int delta, delta_max = 0;
+ pid_t script_pid;
+
+ if ((argc < 3) || (argc > 4)) {
+ printf("Invalid #args received from script. Exiting test..\n");
+ exit(1);
+ }
+
+ test_num = atoi(argv[1]);
+ script_pid = (pid_t) atoi(argv[2]);
+ if ((test_num < 0) || (script_pid < 0)) {
+ printf("Invalid args received from script. Exiting test..\n");
+ exit(1);
+ }
+
+ if (test_num == 2) {
+ strncpy(mytaskfile, argv[3], FILENAME_MAX);
+ strncat(mytaskfile, "/tasks",
+ FILENAME_MAX - strlen(mytaskfile) - 1);
+ write_to_file(mytaskfile, "a", getpid());
+
+ /* Give a chance to other tasks too to go to their class */
+ sleep(8);
+ }
+
+
+ printf("TINFO \tThe latency check task started\n");
+
+ /* Let us start capturing the time now */
+ for (count = NUM_TIMES; count >= 0 ; count -= INTERVALS) {
+ if (gettimeofday(&prev_time, NULL) == -1)
+ perror("In Iteration no 1 \n");
+ /* sleep for specified time */
+ sleeptime = count * USECONDS;
+ usleep(sleeptime);
+
+ if (gettimeofday(&cur_time, NULL) == -1)
+ perror("In Iteration no 1 \n");
+
+ /* Get the actual difference */
+ actual_s = cur_time.tv_sec - prev_time.tv_sec;
+ actual_us = cur_time.tv_usec - prev_time.tv_usec;
+ actual = 1e6 * actual_s + actual_us;
+ delta = actual - sleeptime;
+
+ /* capture the maximum latency observed */
+ if (delta >= delta_max) {
+ delta_max = delta;
+ iteration = i;
+ }
+
+ if (delta > ALLOWED)
+ fail = 1;
+
+ verbose("Iteration %d: Exp(us) =%u, Actual =%u delta = %u\n",
+ i++, sleeptime, actual, delta);
+ }
+
+ if (fail) {
+ printf("FAIL \tThe Latency test %d failed\n", test_num);
+ printf("Max latency observed = %u in Iteration %d\n",
+ delta_max, iteration);
+ } else {
+ printf("PASS \tThe Latency test %d passed\n", test_num);
+ printf("Max latency observed = %u in Iteration %d\n",
+ delta_max, iteration);
+ }
+ /* Done with testing, signal the script */
+ cleanup();
+
+ return 0;
+}
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