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Commit be68fb64 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Michael Ellerman
Browse files

selftest/powerpc: Add additional option to mmap_bench test 



This patch adds --pgfault and --iterations options to mmap_bench test. With
--pgfault we touch every page mapped. This helps in measuring impact in the
page fault path with a patch series.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 10527e80

tools/testing/selftests/powerpc/benchmarks/mmap_bench.c

+50 −3
Original line number Diff line number Diff line
@@ -7,17 +7,34 @@ 
#include <stdlib.h>

#include <sys/mman.h>

#include <time.h>

#include <getopt.h>



#include "utils.h"



#define ITERATIONS 5000000



#define MEMSIZE (128 * 1024 * 1024)

#define MEMSIZE (1UL << 27)

#define PAGE_SIZE (1UL << 16)

#define CHUNK_COUNT (MEMSIZE/PAGE_SIZE)



static int pg_fault;

static int iterations = ITERATIONS;



static struct option options[] = {

	{ "pgfault", no_argument, &pg_fault, 1 },

	{ "iterations", required_argument, 0, 'i' },

	{ 0, },

};



static void usage(void)

{

	printf("mmap_bench <--pgfault> <--iterations count>\n");

}



int test_mmap(void)

{

	struct timespec ts_start, ts_end;

	unsigned long i = ITERATIONS;

	unsigned long i = iterations;



	clock_gettime(CLOCK_MONOTONIC, &ts_start);
@@ -25,6 +42,11 @@ int test_mmap(void) 
		char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,

			       MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);

		FAIL_IF(c == MAP_FAILED);

		if (pg_fault) {

			int count;

			for (count = 0; count < CHUNK_COUNT; count++)

				c[count << 16] = 'c';

		}

		munmap(c, MEMSIZE);

	}
@@ -35,7 +57,32 @@ int test_mmap(void) 
	return 0;

}



int main(void)

int main(int argc, char *argv[])

{

	signed char c;

	while (1) {

		int option_index = 0;



		c = getopt_long(argc, argv, "", options, &option_index);



		if (c == -1)

			break;



		switch (c) {

		case 0:

			if (options[option_index].flag != 0)

				break;



			usage();

			exit(1);

			break;

		case 'i':

			iterations = atoi(optarg);

			break;

		default:

			usage();

			exit(1);

		}

	}

	return test_harness(test_mmap, "mmap_bench");

}