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/******************************************************************************
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*
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* msr_jitter.c
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*
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* Autor: Wilhelm Hagemeister
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*
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* (C) Copyright IgH 2002
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* Ingenieurgemeinschaft IgH
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* Heinz-Bäcker Str. 34
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* D-45356 Essen
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* Tel.: +49 201/61 99 31
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* Fax.: +49 201/61 98 36
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* E-mail: hm@igh-essen.com
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*
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* $Id$
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*
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*****************************************************************************/
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#ifndef __KERNEL__
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# define __KERNEL__
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#endif
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#ifndef MODULE
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# define MODULE
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#endif
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <asm/msr.h> /* maschine-specific registers */
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#include <linux/param.h> /* fuer HZ */
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#include <msr_reg.h>
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#include "msr_jitter.h"
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/*--includes-----------------------------------------------------------------*/
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/*--external functions-------------------------------------------------------*/
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/*--external data------------------------------------------------------------*/
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/*--public data--------------------------------------------------------------*/
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/*--local data---------------------------------------------------------------*/
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#define NUMCLASSES 16
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static int jittime[NUMCLASSES]={0,1,2,5,10,20,50,100,200,500,
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1000,2000,5000,10000,20000,50000}; //in usec
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static int jitcount[NUMCLASSES];
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static double jitpercent[NUMCLASSES];
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static unsigned int tcount = 1;
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static void msr_jit_read(void)
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{
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int i;
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for(i=0;i<NUMCLASSES;i++) {
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if(tcount >100) {
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jitpercent[i] = jitcount[i]*100.0/tcount;
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}
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}
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}
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void msr_jitter_init(void)
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{
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msr_reg_int_list("/Taskinfo/Jitter/Classes","usec",
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&jittime[0],MSR_R,NUMCLASSES,NULL,NULL,NULL);
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msr_reg_int_list("/Taskinfo/Jitter/Count","",
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&jitcount[0],MSR_R,NUMCLASSES,NULL,NULL,NULL);
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msr_reg_dbl_list("/Taskinfo/Jitter/percent","%",
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&jitpercent[0],MSR_R,NUMCLASSES,NULL,NULL,&msr_jit_read);
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}
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/******************************************************************************
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*
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* Function: msr_jitter_run
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*
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* Beschreibung:
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*
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*
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* Parameter: Zeiger auf msr_data
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*
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* Rückgabe:
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*
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* Status: exp
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*
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*****************************************************************************/
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void msr_jitter_run(unsigned int hz) {
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int i,hit;
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static int firstrun = 1;
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static unsigned long k,j = 0;
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unsigned int dt,jitter;
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rdtscl(k);
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tcount++;
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//Zeitabstand zwischen zwei Interrupts in usec
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dt = ((unsigned long)(100000/HZ)*((unsigned long)(k-j)))
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/(current_cpu_data.loops_per_jiffy/10);
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jitter = (unsigned int)abs((int)dt-(int)1000000/hz);
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//jitter errechnet zum Sollabtastrate
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//in die Klassen einsortieren
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if(!firstrun) { //das erste mal nicht einsortieren
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hit = 0;
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for(i=0;i<NUMCLASSES-1;i++) {
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if(jitter>=jittime[i] && jitter<jittime[i+1]) {
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jitcount[i]++;
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hit = 1;
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break;
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}
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}
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if(hit == 0) //grŽöŽßer als der letzte
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jitcount[NUMCLASSES-1]++;
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}
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else
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firstrun = 0;
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j = k;
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}
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