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M7350/filesystems/mtd-utils/tests/jittertest/JitterTest.c
T f75098198c M7350v5_en_gpl
2024-09-09 08:57:42 +00:00

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/***********************************************************************
*
* Copyright: Daniel Measurement and Control, Inc.
* 9753 Pine Lake Drive
* Houston, TX 77055
*
* Created by: Vipin Malik and Gail Murray
* Released under GPL by permission of Daniel Industries.
*
* This software is licensed under the GPL version 2. Plese see the file
* COPYING for details on the license.
*
* NO WARRANTY: Absolutely no claims of warranty or fitness of purpose
* are made in this software. Please use at your own risk.
*
* Filename: JitterTest.c
*
* Description: Program to be used to measure wake jitter.
* See README file for more info.
*
*
* Revision History:
* $Id: JitterTest.c,v 1.13 2005/11/07 11:15:20 gleixner Exp $
* $Log: JitterTest.c,v $
* Revision 1.13 2005/11/07 11:15:20 gleixner
* [MTD / JFFS2] Clean up trailing white spaces
*
* Revision 1.12 2001/08/10 19:23:11 vipin
* Ready to be released under GPL! Added proper headers etc.
*
* Revision 1.11 2001/07/09 15:35:50 vipin
* Couple of new features:1. The program runs by default as a "regular"
* (SCHED_OTHER) task by default, unless the -p n cmd line parameter is
* specified. It then runs as SCHED_RR at that priority.
* 2. Added ability to send SIGSTOP/SIGCONT to a specified PID. This
* would presumably be the PID of the JFFS2 GC task. SIGSTOP is sent
* before writing to the fs, and a SIGCONT after the write is done.
* 3. The "pad" data now written to the file on the "fs under test" is
* random, not sequential as previously.
*
* Revision 1.10 2001/06/27 19:14:24 vipin
* Now console file to log at can be specified from cmd line. This can enable
* you to run two instances of the program- one logging to the /dev/console
* and another to a regular file (if you want the data) or /dev/null if you don't.
*
* Revision 1.9 2001/06/25 20:21:31 vipin
* This is the latest version, NOT the one last checked in!
*
* Revision 1.7 2001/06/18 22:36:19 vipin
* Fix minor typo that excluded '\n' from msg on console.
*
* Revision 1.6 2001/06/18 21:17:50 vipin
* Added option to specify the amount of data written to outfile each period.
* The regular info is written, but is then padded to the requested size.
* This will enable testing of different sized writes to JFFS fs.
*
* Revision 1.5 2001/06/08 19:36:23 vipin
* All write() are now checked for return err code.
*
* Revision 1.4 2001/06/06 23:10:31 vipin
* Added README file.
* In JitterTest.c: Changed operation of periodic timer to one shot. The timer is now
* reset when the task wakes. This way every "jitter" is from the last time and
* jitters from previous times are not accumulated and screw aroud with our display.
*
* All jitter is now +ve. (as it should be). Also added a "read file" functionality
* to test for jitter in task if we have to read from JFFS fs.
* The program now also prints data to console- where it can be logged, interspersed with
* other "interesting" printk's from the kernel and drivers (flash sector erases etc.)
*
* Revision 1.3 2001/03/01 19:20:39 gmurray
* Add priority scheduling. Shortened name of default output file.
* Changed default interrupt period. Output delta time and jitter
* instead of time of day.
*
* Revision 1.2 2001/02/28 16:20:19 vipin
* Added version control Id and log fields.
*
***********************************************************************/
/*************************** Included Files ***************************/
#include <stdio.h> /* fopen, printf, fprintf, fclose */
#include <string.h> /* strcpy, strcmp */
#include <stdlib.h> /* exit, atol, atoi */
#include <sys/time.h> /* setitimer, settimeofday, gettimeofday */
#include <time.h> /* time */
#include <signal.h> /* signal */
#include <sched.h> /* sched_setscheduler, sched_get_priority_min,*/
/* sched_get_priority_max */
#include <unistd.h> /* gettimeofday, sleep */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
/**************************** Enumerations ****************************/
enum timerActions
{
ONESHOT,
AUTORESETTING
};
/****************************** Constants *****************************/
/* Exit error codes */
#define EXIT_FILE_OPEN_ERR (1) /* error opening output file*/
#define EXIT_REG_SIGALRM_ERR (2) /* error registering SIGALRM*/
#define EXIT_REG_SIGINT_ERR (3) /* error registering SIGINT */
#define EXIT_INV_INT_PERIOD (4) /* error invalid int. period*/
#define EXIT_MIN_PRIORITY_ERR (5) /* error, minimum priority */
#define EXIT_MAX_PRIORITY_ERR (6) /* error, maximum priority */
#define EXIT_INV_SCHED_PRIORITY (7) /* error, invalid priority */
#define EXIT_SET_SCHEDULER_ERR (8) /* error, set scheduler */
#define EXIT_PREV_TIME_OF_DAY_ERR (9) /* error, init. prev. */
/* time of day */
#define MAX_FILE_NAME_LEN (32) /* maximum file name length */
#define STRINGS_EQUAL ((int) 0) /* strcmp value if equal */
#define MIN_INT_PERIOD_MILLISEC ( 5L) /* minimum interrupt period */
#define MAX_INT_PERIOD_MILLISEC (5000L) /* maximum interrupt period */
#define DEF_INT_PERIOD_MILLISEC ( 10L) /* default interrupt period */
#define READ_FILE_MESSAGE "This is a junk file. Must contain at least 1 byte though!\n"
/* The user can specify that the program pad out the write file to
a given number of bytes. But a minimum number needs to be written. This
will contain the jitter info.
*/
#define MIN_WRITE_BYTES 30
#define DEFAULT_WRITE_BYTES 30
#define MAX_WRITE_BYTES 4096
/* used for gen a printable ascii random # between spc and '~' */
#define MIN_ASCII 32 /* <SPACE> can be char*/
#define MAX_ASCII 126.0 /* needs to be float. See man rand() */
/*----------------------------------------------------------------------
* It appears that the preprocessor can't handle multi-line #if
* statements. Thus, the check on the default is divided into two
* #if statements.
*---------------------------------------------------------------------*/
#if (DEF_INT_PERIOD_MILLISEC < MIN_INT_PERIOD_MILLISEC)
#error *** Invalid default interrupt period. ***
#endif
#if (DEF_INT_PERIOD_MILLISEC > MAX_INT_PERIOD_MILLISEC)
#error *** Invalid default interrupt period. ***
#endif
#define TRUE 1 /* Boolean true value */
#define FALSE 0
/* Time conversion constants. */
#define MILLISEC_PER_SEC (1000L) /* milliseconds per second */
#define MICROSEC_PER_MILLISEC (1000L) /* microsecs per millisec */
#define MICROSEC_PER_SEC (1000000L) /* microsecs per second */
#define PRIORITY_POLICY ((int) SCHED_RR) /* If specified iwth "-p" */
/************************** Module Variables **************************/
/* version identifier (value supplied by CVS)*/
static const char Version[] = "$Id: JitterTest.c,v 1.13 2005/11/07 11:15:20 gleixner Exp $";
static char OutFileName[MAX_FILE_NAME_LEN+1]; /* output file name */
static char LogFile[MAX_FILE_NAME_LEN+1] = "/dev/console"; /* default */
static char ReadFile[MAX_FILE_NAME_LEN+1]; /* This file is read. Should
contain at least 1 byte */
static int WriteBytes = DEFAULT_WRITE_BYTES; /* pad out file to these many bytes. */
static int Fd1; /* fd where the above buffer if o/p */
static int Cfd; /* fd to console (or file specified) */
static int Fd2; /* fd for the ReadFile */
static int DoRead = FALSE; /* should we attempt to ReadFile?*/
static long InterruptPeriodMilliSec; /* interrupt period, millisec */
static int MinPriority; /* minimum scheduler priority */
static int MaxPriority; /* maximum scheduler priority */
static int RequestedPriority; /* requested priority */
static struct itimerval ITimer; /* interrupt timer structure */
static struct timeval PrevTimeVal; /* previous time structure */
static struct timeval CurrTimeVal; /* current time structure */
static long LastMaxDiff = 0; /* keeps track of worst jitter encountered */
static int GrabKProfile = FALSE; /* To help determine system bottle necks
this parameter can be set. This causes
the /proc/profile file to be read and
stored in unique filenames in current
dir, and indication to be o/p on the
/dev/console also.
*/
static long ProfileTriggerMSecs = 15000l; /* Jitter time in seconds that triggers
a snapshot of the profile to be taken
*/
static int SignalGCTask = FALSE; /* should be signal SIGSTOP/SIGCONT to gc task?*/
static int GCTaskPID;
static int RunAsRTTask = FALSE; /* default action unless priority is
specified on cmd line */
/********************* Local Function Prototypes **********************/
void HandleCmdLineArgs(int argc, char *argv[]);
void SetFileName(char * pFileName);
void SetInterruptPeriod(char * pASCIIInterruptPeriodMilliSec);
void SetSchedulerPriority(char * pASCIISchedulerPriority);
void PrintVersionInfo(void);
void PrintHelpInfo(void);
int Write(int fd, void *buf, size_t bytes, int lineNo);
void InitITimer(struct itimerval * pITimer, int action);
/* For catching timer interrupts (SIGALRM). */
void AlarmHandler(int sigNum);
/* For catching Ctrl+C SIGINT. */
void SignalHandler(int sigNum);
/***********************************************************************
* main function
* return: exit code
***********************************************************************/
int main(
int argc,
char *argv[])
{
struct sched_param schedParam;
int mypri;
char tmpBuf[200];
strcpy(OutFileName,"jitter.dat");
InterruptPeriodMilliSec = MIN_INT_PERIOD_MILLISEC;
/* Get the minimum and maximum priorities. */
MinPriority = sched_get_priority_min(PRIORITY_POLICY);
MaxPriority = sched_get_priority_max(PRIORITY_POLICY);
if (MinPriority == -1) {
printf("\n*** Unable to get minimum priority. ***\n");
exit(EXIT_MIN_PRIORITY_ERR);
}
if (MaxPriority == -1) {
printf("\n*** Unable to get maximum priority. ***\n");
exit(EXIT_MAX_PRIORITY_ERR);
}
/* Set requested priority to minimum value as default. */
RequestedPriority = MinPriority;
HandleCmdLineArgs(argc, argv);
if(mlockall(MCL_CURRENT|MCL_FUTURE) < 0){
printf("Could not lock task into memory. Bye\n");
perror("Error");
}
if(RunAsRTTask){
/* Set the priority. */
schedParam.sched_priority = RequestedPriority;
if (sched_setscheduler(
0,
PRIORITY_POLICY,
&schedParam) != (int) 0) {
printf("Exiting: Unsuccessful sched_setscheduler.\n");
close(Fd1);
exit(EXIT_SET_SCHEDULER_ERR);
}
/* Double check as I have some doubts that it's really
running at realtime priority! */
if((mypri = sched_getscheduler(0)) != RequestedPriority)
{
printf("Not running with request priority %i. running with priority %i instead!\n",
RequestedPriority, mypri);
}else
{
printf("Running with %i priority. Good!\n", mypri);
}
}
/*------------------------- Initializations --------------------------*/
if((Fd1 = open(OutFileName, O_RDWR|O_CREAT|O_SYNC, S_IRWXU)) <= 0)
{
perror("Cannot open outfile for write:");
exit(1);
}
/* If a request is made to read from a specified file, then create that
file and fill with junk data so that there is something there to read.
*/
if(DoRead)
{
if((Fd2 = open(ReadFile, O_RDWR|O_CREAT|O_SYNC|O_TRUNC, S_IRWXU)) <= 0)
{
perror("cannot open read file:");
exit(1);
}else
{
/* Don't really care how much we write here */
if(write(Fd2, READ_FILE_MESSAGE, strlen(READ_FILE_MESSAGE)) < 0)
{
perror("Problems writing to readfile:");
exit(1);
}
lseek(Fd2, 0, SEEK_SET); /* position back to byte #0 */
}
}
/* Also log output to console. This way we can capture it
on a serial console to a log file.
*/
if((Cfd = open(LogFile, O_WRONLY|O_SYNC)) <= 0)
{
perror("cannot open o/p logfile:");
exit(1);
}
/* Set-up handler for periodic interrupt. */
if (signal(SIGALRM, &AlarmHandler) == SIG_ERR) {
printf("Couldn't register signal handler for SIGALRM.\n");
sprintf(tmpBuf,
"Couldn't register signal handler for SIGALRM.\n");
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
close(Fd1);
exit(EXIT_REG_SIGALRM_ERR);
}
/* Set-up handler for Ctrl+C to exit the program. */
if (signal(SIGINT, &SignalHandler) == SIG_ERR) {
printf("Couldn't register signal handler for SIGINT.\n");
sprintf(tmpBuf,
"Couldn't register signal handler for SIGINT.\n");
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
close(Fd1);
exit(EXIT_REG_SIGINT_ERR);
}
printf("Press Ctrl+C to exit the program.\n");
printf("Output File: %s\n", OutFileName);
printf("Scheduler priority: %d\n", RequestedPriority);
sprintf(tmpBuf, "\nScheduler priority: %d\n",
RequestedPriority);
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
printf("Interrupt period: %ld milliseconds\n",
InterruptPeriodMilliSec);
sprintf(tmpBuf, "Interrupt period: %ld milliseconds\n",
InterruptPeriodMilliSec);
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
fflush(0);
/* Initialize the periodic timer. */
InitITimer(&ITimer, ONESHOT);
/* Initialize "previous" time. */
if (gettimeofday(&PrevTimeVal, NULL) != (int) 0) {
printf("Exiting - ");
printf("Unable to initialize previous time of day.\n");
sprintf(tmpBuf, "Exiting - ");
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
sprintf(tmpBuf,
"Unable to initialize previous time of day.\n");
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
}
/* Start the periodic timer. */
setitimer(ITIMER_REAL, &ITimer, NULL);
while(TRUE) { /* Intentional infinite loop. */
/* Sleep for one second. */
sleep((unsigned int) 1);
}
/* Just in case. File should be closed in SignalHandler. */
close(Fd1);
close(Cfd);
return 0;
}
/***********************************************************************
* SignalHandler
* This is a handler for the SIGINT signal. It is assumed that the
* SIGINT is due to the user pressing Ctrl+C to halt the program.
* output: N/A
***********************************************************************/
void SignalHandler(
int sigNum)
{
char tmpBuf[200];
/* Note sigNum not used. */
printf("Ctrl+C detected. Worst Jitter time was:%fms.\nJitterTest exiting.\n",
(float)LastMaxDiff/1000.0);
sprintf(tmpBuf,
"\nCtrl+C detected. Worst Jitter time was:%fms\nJitterTest exiting.\n",
(float)LastMaxDiff/1000.0);
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
close(Fd1);
close(Cfd);
exit(0);
}
/*
A snapshot of the /proc/profile needs to be taken.
This is stored as a new file every time, and the
stats reset by doing a (any) write to the /proc/profile
file.
*/
void doGrabKProfile(int jitterusec, char *fileName)
{
int fdSnapshot;
int fdProfile;
int readBytes;
char readBuf[4096];
if((fdSnapshot = open(fileName, O_WRONLY | O_CREAT, S_IRWXU)) <= 0)
{
fprintf(stderr, "Could not open file %s.\n", fileName);
perror("Error:");
return;
}
if((fdProfile = open("/proc/profile", O_RDWR)) <= 0)
{
fprintf(stderr, "Could not open file /proc/profile. Make sure you booted with profile=2\n");
close(fdSnapshot);
return;
}
while((readBytes = read(fdProfile, readBuf, sizeof(readBuf))) > 0)
{
int writeBytes = write(fdSnapshot, readBuf, readBytes);
if (writeBytes != readBytes) {
perror("write error");
break;
}
}
close(fdSnapshot);
if(write(fdProfile, readBuf, 1) != 1)
{
perror("Could Not clear profile by writing to /proc/profile:");
}
close(fdProfile);
}/* end doGrabKProfile()*/
/*
Call this routine to clear the kernel profiling buffer /proc/profile
*/
void clearProfileBuf(void){
int fdProfile;
char readBuf[10];
if((fdProfile = open("/proc/profile", O_RDWR)) <= 0)
{
fprintf(stderr, "Could not open file /proc/profile. Make sure you booted with profile=2\n");
return;
}
if(write(fdProfile, readBuf, 1) != 1)
{
perror("Could Not clear profile by writing to /proc/profile:");
}
close(fdProfile);
}/* end clearProfileBuf() */
/***********************************************************************
* AlarmHandler
* This is a handler for the SIGALRM signal (due to the periodic
* timer interrupt). It prints the time (seconds) to
* the output file.
* output: N/A
***********************************************************************/
void AlarmHandler(
int sigNum) /* signal number (not used) */
{
long timeDiffusec; /* diff time in micro seconds */
long intervalusec;
char tmpBuf[MAX_WRITE_BYTES];
int cntr;
char padChar;
static int profileFileNo = 0;
char profileFileName[150];
static int seedStarter = 0; /* carries over rand info to next time
where time() will be the same as this time
if invoked < 1sec apart.
*/
if (gettimeofday(&CurrTimeVal, NULL) == (int) 0) {
/*----------------------------------------------------------------
* Compute the elapsed time between the current and previous
* time of day values and store the result.
*
* Print the elapsed time to the output file.
*---------------------------------------------------------------*/
timeDiffusec = (long)(((((long long)CurrTimeVal.tv_sec) * 1000000L) + CurrTimeVal.tv_usec) -
(((long long)PrevTimeVal.tv_sec * 1000000L) + PrevTimeVal.tv_usec));
sprintf(tmpBuf," %f ms ", (float)timeDiffusec/1000.0);
intervalusec = InterruptPeriodMilliSec * 1000L;
timeDiffusec = timeDiffusec - intervalusec;
sprintf(&tmpBuf[strlen(tmpBuf)]," %f ms", (float)timeDiffusec/1000.0);
/* should we send a SIGSTOP/SIGCONT to the specified PID? */
if(SignalGCTask){
if(kill(GCTaskPID, SIGSTOP) < 0){
perror("error:");
}
}
/* Store some historical #'s */
if(abs(timeDiffusec) > LastMaxDiff)
{
LastMaxDiff = abs(timeDiffusec);
sprintf(&tmpBuf[strlen(tmpBuf)],"!");
if((GrabKProfile == TRUE) && (ProfileTriggerMSecs < (abs(timeDiffusec)/1000)))
{
sprintf(profileFileName, "JitterTest.profilesnap-%i", profileFileNo);
/* go and grab the kernel performance profile. */
doGrabKProfile(timeDiffusec, profileFileName);
profileFileNo++; /* unique name next time */
/* Say so on the console so that a marker gets put in the console log */
sprintf(&tmpBuf[strlen(tmpBuf)],"<Profile saved in file:%s>",
profileFileName);
}
}
sprintf(&tmpBuf[strlen(tmpBuf)],"\n"); /* CR for the data going out of the console */
Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
/* The "-1" below takes out the '\n' at the end that we appended for the msg printed on
the console.*/
sprintf(&tmpBuf[strlen(tmpBuf)-1]," PadBytes:");
/* Now pad the output file if requested by user. */
if(WriteBytes > MIN_WRITE_BYTES)
{
/* start from a new place every time */
srand(time(NULL) + seedStarter);
/* already written MIN_WRITE_BYTES by now */
for(cntr = strlen(tmpBuf); cntr < WriteBytes - 1 ; cntr++) /* "-1" adj for '\n' at end */
{
/* don't accept any # < 'SPACE' */
padChar = (char)(MIN_ASCII+(int)((MAX_ASCII-(float)MIN_ASCII)*rand()/(RAND_MAX+1.0)));
/*
padChar = (cntr % (126-33)) + 33;
*/
tmpBuf[cntr] = padChar;
}
seedStarter = tmpBuf[cntr-1]; /* save for next time */
tmpBuf[cntr] = '\n'; /* CR for the data going into the outfile. */
tmpBuf[cntr+1] = '\0'; /* NULL terminate the string */
}
/* write out the entire line to the output file. */
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
/* Read a byte from the specified file */
if(DoRead)
{
cntr = read(Fd2, tmpBuf, 1);
if (cntr < 0)
perror("read error");
lseek(Fd2, 0, SEEK_SET); /* back to start */
}
/* Start the periodic timer again. */
setitimer(ITIMER_REAL, &ITimer, NULL);
/* Update previous time with current time. */
PrevTimeVal.tv_sec = CurrTimeVal.tv_sec;
PrevTimeVal.tv_usec = CurrTimeVal.tv_usec;
}
else {
sprintf(tmpBuf, "gettimeofday error \n");
Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
printf("gettimeofday error \n");
}
/* now clear the profiling buffer */
if(GrabKProfile == TRUE){
clearProfileBuf();
}
/* should we send a SIGSTOP/SIGCONT to the specified PID? */
if(SignalGCTask){
if(kill(GCTaskPID, SIGCONT) < 0){
perror("error:");
}
}
return;
}
/***********************************************************************
* InitITimer
* This function initializes the 'struct itimerval' structure whose
* address is passed to interrupt every InterruptPeriodMilliSec.
* output: N/A
***********************************************************************/
void InitITimer(
struct itimerval * pITimer, /* pointer to interrupt timer struct*/
int action) /* ONESHOT or autosetting? */
{
long seconds; /* seconds portion of int. period */
long microSeconds; /* microsec. portion of int. period */
/*--------------------------------------------------------------------
* Divide the desired interrupt period into its seconds and
* microseconds components.
*-------------------------------------------------------------------*/
if (InterruptPeriodMilliSec < MILLISEC_PER_SEC) {
seconds = 0L;
microSeconds = InterruptPeriodMilliSec * MICROSEC_PER_MILLISEC;
}
else {
seconds = InterruptPeriodMilliSec / MILLISEC_PER_SEC;
microSeconds =
(InterruptPeriodMilliSec - (seconds * MILLISEC_PER_SEC)) *
MICROSEC_PER_MILLISEC;
}
/* Initialize the interrupt period structure. */
pITimer->it_value.tv_sec = seconds;
pITimer->it_value.tv_usec = microSeconds;
if(action == ONESHOT)
{
/* This will (should) prevent the timer from restarting itself */
pITimer->it_interval.tv_sec = 0;
pITimer->it_interval.tv_usec = 0;
}else
{
pITimer->it_interval.tv_sec = seconds;
pITimer->it_interval.tv_usec = microSeconds;
}
return;
}
/***********************************************************************
* HandleCmdLineArgs
* This function handles the command line arguments.
* output: stack size
***********************************************************************/
void HandleCmdLineArgs(
int argc, /* number of command-line arguments */
char *argv[]) /* ptrs to command-line arguments */
{
int argNum; /* argument number */
if (argc > (int) 1) {
for (argNum = (int) 1; argNum < argc; argNum++) {
/* The command line contains an argument. */
if ((strcmp(argv[argNum],"--version") == STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-v") == STRINGS_EQUAL)) {
/* Print version information and exit. */
PrintVersionInfo();
exit(0);
}
else if ((strcmp(argv[argNum],"--help") == STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-h") == STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-?") == STRINGS_EQUAL)) {
/* Print help information and exit. */
PrintHelpInfo();
exit(0);
}
else if ((strcmp(argv[argNum],"--file") == STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-f") == STRINGS_EQUAL)) {
/* Set the name of the output file. */
++argNum;
if (argNum < argc) {
SetFileName(argv[argNum]);
}
else {
printf("*** Output file name not specified. ***\n");
printf("Default output file name will be used.\n");
}
}
else if ((strcmp(argv[argNum],"--time") == STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-t") == STRINGS_EQUAL)) {
/* Set the interrupt period. */
++argNum;
if (argNum < argc) {
SetInterruptPeriod(argv[argNum]);
}
else {
printf("*** Interrupt period not specified. ***\n");
printf("Default interrupt period will be used.\n");
}
}
else if ((strcmp(argv[argNum],"--priority") ==
STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-p") == STRINGS_EQUAL)) {
/* Set the scheduler priority. */
++argNum;
if (argNum < argc) {
SetSchedulerPriority(argv[argNum]);
}
else {
printf("*** Scheduler priority not specified. ***\n");
printf("Default scheduler priority will be used.\n");
}
}
else if ((strcmp(argv[argNum],"--readfile") ==
STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-r") == STRINGS_EQUAL)) {
/* Set the file to read*/
++argNum;
strncpy(ReadFile, argv[argNum], sizeof(ReadFile));
DoRead = TRUE;
}
else if ((strcmp(argv[argNum],"--write_bytes") ==
STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-w") == STRINGS_EQUAL)) {
/* Set the file to read*/
++argNum;
WriteBytes = atoi(argv[argNum]);
if(WriteBytes < MIN_WRITE_BYTES)
{
printf("Writing less than %i bytes is not allowed. Bye.\n",
MIN_WRITE_BYTES);
exit(0);
}
}
else if ((strcmp(argv[argNum],"--consolefile") ==
STRINGS_EQUAL) ||
(strcmp(argv[argNum],"-c") == STRINGS_EQUAL)) {
/* Set the file to log console log on. */
++argNum;
strncpy(LogFile, argv[argNum], sizeof(LogFile));
}
else if ((strcmp(argv[argNum],"--grab_kprofile") ==
STRINGS_EQUAL))
{
/* We will read the /proc/profile file on configurable timeout */
GrabKProfile = TRUE;
++argNum;
/* If the jittter is > this #, then the profile is grabbed. */
ProfileTriggerMSecs = (long) atoi(argv[argNum]);
if(ProfileTriggerMSecs <= 0){
printf("Illegal value for profile trigger threshold.\n");
exit(0);
}
}
else if ((strcmp(argv[argNum],"--siggc") ==
STRINGS_EQUAL))
{
/* We will SIGSTOP/SIGCONT the specified pid */
SignalGCTask = TRUE;
++argNum;
GCTaskPID = atoi(argv[argNum]);
if(ProfileTriggerMSecs <= 0){
printf("Illegal value for JFFS(2) GC task pid.\n");
exit(0);
}
}
else {
/* Unknown argument. Print help information and exit. */
printf("Invalid option %s\n", argv[argNum]);
printf("Try 'JitterTest --help' for more information.\n");
exit(0);
}
}
}
return;
}
/***********************************************************************
* SetFileName
* This function sets the output file name.
* output: N/A
***********************************************************************/
void SetFileName(
char * pFileName) /* ptr to desired output file name */
{
size_t fileNameLen; /* file name length (bytes) */
/* Check file name length. */
fileNameLen = strlen(pFileName);
if (fileNameLen > (size_t) MAX_FILE_NAME_LEN) {
printf("File name %s exceeds maximum length %d.\n",
pFileName, MAX_FILE_NAME_LEN);
exit(0);
}
/* File name length is OK so save the file name. */
strcpy(OutFileName, pFileName);
return;
}
/***********************************************************************
* SetInterruptPeriod
* This function sets the interrupt period.
* output: N/A
***********************************************************************/
void SetInterruptPeriod(
char * /* ptr to desired interrupt period */
pASCIIInterruptPeriodMilliSec)
{
long period; /* interrupt period */
period = atol(pASCIIInterruptPeriodMilliSec);
if ((period < MIN_INT_PERIOD_MILLISEC) ||
(period > MAX_INT_PERIOD_MILLISEC)) {
printf("Invalid interrupt period: %ld ms.\n", period);
exit(EXIT_INV_INT_PERIOD);
}
else {
InterruptPeriodMilliSec = period;
}
return;
}
/***********************************************************************
* SetSchedulerPriority
* This function sets the desired scheduler priority.
* output: N/A
***********************************************************************/
void SetSchedulerPriority(
char * pASCIISchedulerPriority) /* ptr to desired scheduler priority*/
{
int priority; /* desired scheduler priority value */
priority = atoi(pASCIISchedulerPriority);
if ((priority < MinPriority) ||
(priority > MaxPriority)) {
printf("Scheduler priority %d outside of range [%d, %d]\n",
priority, MinPriority, MaxPriority);
exit(EXIT_INV_SCHED_PRIORITY);
}
else {
RequestedPriority = priority;
RunAsRTTask = TRUE; /* We shall run as a POSIX real time task */
}
return;
}
/***********************************************************************
* PrintVersionInfo
* This function prints version information.
* output: N/A
***********************************************************************/
void PrintVersionInfo(void)
{
printf("JitterTest version %s\n", Version);
printf("Copyright (c) 2001, Daniel Industries, Inc.\n");
return;
}
/***********************************************************************
* PrintHelpInfo
* This function prints help information.
* output: N/A
***********************************************************************/
void PrintHelpInfo(void)
{
printf("Usage: JitterTest [options]\n");
printf(" *** Requires root privileges. ***\n");
printf("Option:\n");
printf(" [-h, --help, -?] Print this message and exit.\n");
printf(" [-v, --version] ");
printf( "Print the version number of JitterTest and exit.\n");
printf(" [-f FILE, --file FILE] Set output file name to FILE. Typically you would put this on the fs under test\n");
printf(" [-c FILE, --consolefile] Set device or file to write the console log to.\n\tTypically you would set this to /dev/console and save it on another computer.\n");
printf(" [-w BYTES, --write_bytes BYTES Write BYTES to FILE each period.\n");
printf(" [-r FILE, --readfile FILE] Also read 1 byte every cycle from FILE. FILE will be created and filled with data.\n");
printf(" [-t <n>, --time <n>] ");
printf( "Set interrupt period to <n> milliseconds.\n");
printf(" ");
printf( "Range: [%ld, %ld] milliseconds.\n",
MIN_INT_PERIOD_MILLISEC, MAX_INT_PERIOD_MILLISEC);
printf(" [-p <n>, --priority <n>] ");
printf( "Set scheduler priority to <n>.\n");
printf(" ");
printf( "Range: [%d, %d] (higher number = higher priority)\n",
MinPriority, MaxPriority);
printf(" [--grab_kprofile <THRESHOLD in ms>] Read the /proc/profile if jitter is > THRESHOLD and store in file.\n");
printf(" [--siggc <PID>] Before writing to fs send SIGSTOP to PID. After write send SIGCONT\n");
return;
}
/* A common write that checks for write errors and exits. Pass it __LINE__ for lineNo */
int Write(int fd, void *buf, size_t bytes, int lineNo)
{
int err;
err = write(fd, buf, bytes);
if(err < bytes)
{
printf("Write Error at line %i! Wanted to write %zu bytes, but wrote only %i bytes.\n",
lineNo, bytes, err);
perror("Write did not complete. Error. Bye:"); /* show error from errno. */
exit(1);
}
return err;
}/* end Write*/
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