testcases/kernel/sched/hyperthreading/ht_interrupt/ht_interrupt.c

/***************************************************************************
                          HTinterrupt.c  -  description
                             -------------------
    email                : sonic,zhang@intel.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
#include "ht_utils.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "test.h"

char *TCID = "ht_interrupt";
int TST_TOTAL = 1;

#define INTERRUPT_NAME	"/proc/interrupts"

int HT_InterruptDistribution()
{
	FILE *pFile;
	int ci[32],cj[32];
	int cpucount, i;
	int cmax, cmin, d;

	tst_resm(TINFO, "Get interrupts distribution with HT.");

	if ((cpucount=get_cpu_count())<=0)
	{
		return 0;
	}

	if ((pFile=fopen(INTERRUPT_NAME, "r"))==NULL)
	{
		return 0;
	}

	fgets(buf, 255, pFile);
	fscanf(pFile, "%s %d %d %d %d %d %d %d %d \
%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d \
%d %d %d %d %d %d %d %d", buf, ci, ci+1, ci+2, ci+3,
ci+4, ci+5, ci+6, ci+7, ci+8, ci+9, ci+10, ci+11,
ci+12, ci+13, ci+14, ci+15, ci+16, ci+17, ci+18, ci+19,
ci+20, ci+21, ci+22, ci+23, ci+24, ci+25, ci+26, ci+27,
ci+28, ci+29, ci+30, ci+31);

	fclose(pFile);

	for (i=0;i<10;i++)
	{
		sleep(1);
		printf(".");
	}

	if ((pFile=fopen(INTERRUPT_NAME, "r"))==NULL)
	{
		return 0;
	}

	fgets(buf, 255, pFile);
	fscanf(pFile, "%s %d %d %d %d %d %d %d %d \
%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d \
%d %d %d %d %d %d %d %d", buf, cj, cj+1, cj+2, cj+3,
cj+4, cj+5, cj+6, cj+7, cj+8, cj+9, cj+10, cj+11,
cj+12, cj+13, cj+14, cj+15, cj+16, cj+17, cj+18, cj+19,
cj+20, cj+21, cj+22, cj+23, cj+24, cj+25, cj+26, cj+27,
cj+28, cj+29, cj+30, cj+31);

	fclose(pFile);

	printf("\n\n");
	printf("Timer interrupt counts per CPU:\n");
	d=cj[0]-ci[0];
	printf("%d ", d);
	cmax=cmin=d;
	for (i=1;i<cpucount;i++)
	{
		d=cj[i]-ci[i];
		printf("%d ", d);
		if (cmax<d)
			cmax=d;
		if (cmin>d)
			cmin=d;
	}

	printf("\n\n");
	printf("max value: %d\n", cmax);
	printf("min value: %d\n", cmin);
	printf("\n");

	if (cmin==0 || cmax/cmin>10)
	{
	 	return 0;
	}
	else
	{
	 	return 1;
	}
}

// return 0 means Pass, return 1 means Fail.
int main(int argc, char *argv[])
{
	tst_resm(TINFO, "Begin: HyperThreading Interrupt");

#if (!defined __i386__ && !defined __x86_64__)
	tst_brkm(TCONF, NULL, "This test suite can only execute on x86 architecture.");
#else
	if (!check_ht_capability())
	{
		if (HT_InterruptDistribution())
			tst_resm(TPASS, "Interrupt distribution is balanceable.");
		else
			tst_resm(TFAIL, "Interrupt distribution is not balanceable.");
	}
	else
	{
		tst_brkm(TCONF, NULL, "HT is not enabled or not supported.");
	}
#endif

	tst_resm(TINFO, "End: HyperThreading Interrupt");

	tst_exit();
}