xref: /external/ltp/testcases/kernel/sched/hyperthreading/ht_affinity/ht_affinity.c

/***************************************************************************
                          HTaffinity.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 <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "test.h"

char *TCID = "smt_smp_affinity";
int TST_TOTAL = 3;

/************************************************************************************
int set_affinity(pid_t pid, unsigned int len, unsigned long *mask_ptr)
pid - pid of the process whose affinity is desired to be set.
mask_ptr - pointer to the new cpu_affinity_mask.
len - length in bytes of the bitmask pointed to by user_mask_ptr.

int get_affinity(pid_t pid, unsigned int len, unsigned long *mask_ptr)
pid - pid of the process whose affinity is being read.
mask_ptr pointer to store the current affinity information.
len - length in bytes of the bitmask pointed to by user_mask_ptr.
************************************************************************************/

//Any application program can invoke these system call using sched_setaffinity() and sched_getaffinity(),
//with the syntax mentioned in the previous section, after declaring the interface as:

#define sched_setaffinity(pid, cpusetsize, mask) syscall(__NR_sched_setaffinity, pid, cpusetsize, mask)
#define sched_getaffinity(pid, cpusetsize, mask) syscall(__NR_sched_getaffinity, pid, cpusetsize, mask)

#define AFFINITY_NAME "affinity"
#define PROCFS_PATH "/proc/"

int HT_SetAffinity()
{
	unsigned int mask;
	pid_t pid;
	int result = 1;
	int cpu_count, i, j, k, cpuid;

	pid = getpid();

	tst_resm(TINFO, "Set affinity through system call");

	cpu_count = get_cpu_count();
	if (cpu_count == 0) {
		return 0;
	} else if (cpu_count > 32)
		cpu_count = 32;

	for (i = 0, mask = 0x1; i < cpu_count; i++, mask = mask << 1) {
		tst_resm(TINFO, "Set test process affinity.");
		printf("mask: %x\n", mask);

		sched_setaffinity(pid, sizeof(unsigned long), &mask);

		for (j = 0; j < 10; j++) {
			for (k = 0; k < 10; k++) {
				if (fork() == 0) {
					system("ps > /dev/null");
					exit(0);
				}
			}

			sleep(1);

			if (get_current_cpu(pid) != i)
				break;
		}

		if (j < 10) {
			tst_resm(TINFO, "...Error");
			result = 0;
		} else
			tst_resm(TINFO, "...OK");

	}

	for (i = 0, mask = 0x3; i < cpu_count - 1; i++, mask = mask << 1) {
		tst_resm(TINFO, "Set test process affinity.");
		printf("mask: %x\n", mask);

		sched_setaffinity(pid, sizeof(unsigned long), &mask);

		for (j = 0; j < 10; j++) {
			for (k = 0; k < 10; k++) {
				if (fork() == 0) {
					system("ps > /dev/null");
					exit(0);
				}
			}

			sleep(1);

			cpuid = get_current_cpu(pid);
			if (cpuid != i && cpuid != i + 1)
				break;
		}

		if (j < 10) {
			tst_resm(TINFO, "...Error");
			result = 0;
		} else
			tst_resm(TINFO, "...OK");

	}

	if (result)
		return 1;
	else
		return 0;
}

unsigned long get_porc_affinity(pid_t pid)
{
	FILE *pfile;

	sprintf(buf, "%s%d/%s%c", PROCFS_PATH, pid, AFFINITY_NAME, 0);

	if ((pfile = fopen(buf, "r")) == NULL)
		return 0;

	if (fgets(buf, 255, pfile) == NULL) {
		fclose(pfile);
		return 0;
	}

	fclose(pfile);

	return atol(buf);
}

int HT_GetAffinity()
{
	unsigned int mask[2], mask1[2];
	pid_t pid;

	mask[0] = 0x1;
	pid = getpid();

	tst_resm(TINFO, "Get affinity through system call");

	sched_setaffinity(pid, sizeof(mask), mask);

	sleep(1);

	sched_getaffinity(pid, sizeof(mask), mask1);

	if (mask[0] == 0x1 && mask[0] == mask1[0]) {
		mask[0] = 0x2;
		sched_setaffinity(pid, sizeof(mask), mask);

		sleep(1);

		sched_getaffinity(pid, sizeof(mask), mask1);

		if (mask[0] == 0x2 && mask[0] == mask1[0])
			return 1;
		else
			return 0;
	} else
		return 0;
}

int HT_InheritAffinity()
{
	unsigned int mask[2];
	pid_t pid;
	int status;
	mask[0] = 0x2;
	pid = getpid();

	sched_setaffinity(pid, sizeof(mask), mask);

	sleep(1);
	pid = fork();
	if (pid == 0) {
		sleep(1);
		sched_getaffinity(pid, sizeof(mask), mask);
		if (mask[0] == 0x2)
			exit(0);

		else
			exit(1);
	} else if (pid < 0) {
		tst_resm(TINFO, "Inherit affinity:fork failed!");
		return 0;
	}
	waitpid(pid, &status, 0);

	if (WEXITSTATUS(status) == 0) {
		tst_resm(TINFO, "Inherited affinity from parent process");
		return 1;
	} else
		return 0;
}

// return 0 means Pass, return 1 means Fail
int main(int argc, char *argv[])
{

#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_GetAffinity())
			tst_resm(TPASS, "System call getaffinity() is OK.");
		else
			tst_resm(TFAIL, "System call getaffinity() is error.");

		printf("\n");

		if (HT_InheritAffinity())
			tst_resm(TPASS, "Inheritance of affinity is OK.");
		else
			tst_resm(TFAIL, "Inheritance of affinity is error.");

		printf("\n");

		if (HT_SetAffinity())
			tst_resm(TPASS, "System call setaffinity() is OK.");
		else
			tst_resm(TFAIL, "System call setaffinity() is error.");
	} else {
		tst_brkm(TCONF, NULL, "HT is not enabled or not supported.");
	}
#endif

	tst_exit();
}