minix/test/test74.c

/* Test 74 - mmap functionality test.
 */

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/ioc_memory.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#include "common.h"
#include "testcache.h"

int
dowriteblock(int b, int blocksize, u32_t seed, char *data)
{
	u64_t offset;
	int fd;

	get_fd_offset(b, blocksize, &offset, &fd);

	if(pwrite(fd, data, blocksize, offset) < blocksize) {
		perror("pwrite");
		return -1;
	}

	return blocksize;
}

int
readblock(int b, int blocksize, u32_t seed, char *data)
{
	u64_t offset;
	int fd;
	char *mmapdata;
	int pread_first = random() % 2;

	get_fd_offset(b, blocksize, &offset, &fd);

	if(pread_first) {
		if(pread(fd, data, blocksize, offset) < blocksize) {
			perror("pread");
			return -1;
		}
	}

	if((mmapdata = minix_mmap(NULL, blocksize, PROT_READ, MAP_PRIVATE | MAP_FILE,
		fd, offset)) == MAP_FAILED) {
		perror("mmap");
		return -1;
	}

	if(!pread_first) {
		if(pread(fd, data, blocksize, offset) < blocksize) {
			perror("pread");
			return -1;
		}
	}

	if(memcmp(mmapdata, data, blocksize)) {
		fprintf(stderr, "readblock: mmap, pread mismatch\n");
		return -1;
	}

	if(minix_munmap(mmapdata, blocksize) < 0) {
		perror("munmap");
		return -1;
	}

	return blocksize;
}

void testend(void) { }

void basic_regression(void)
{
	void *block;
#define BLOCKSIZE (PAGE_SIZE*10)
	block = minix_mmap(0, BLOCKSIZE, PROT_READ | PROT_WRITE,
		MAP_PRIVATE | MAP_ANON, -1, 0);

	if(block == MAP_FAILED) { e(1); exit(1); }

	memset(block, 0, BLOCKSIZE);

	/* shrink from bottom */
	minix_munmap(block, PAGE_SIZE);
}

int
main(int argc, char *argv[])
{
	int iter = 2;

	start(74);

	basic_regression();

	makefiles(MAXFILES);

	cachequiet(!bigflag);
	if(bigflag) iter = 3;

	/* Try various combinations working set sizes
	 * and block sizes in order to specifically 
	 * target the primary cache, then primary+secondary
	 * cache, then primary+secondary cache+secondary
	 * cache eviction.
	 */

	if(dotest(PAGE_SIZE,    100, iter)) e(5);
	if(dotest(PAGE_SIZE*2,  100, iter)) e(2);
	if(dotest(PAGE_SIZE*3,  100, iter)) e(3);
	if(dotest(PAGE_SIZE,  20000, iter)) e(5);

	if(bigflag) {
		u32_t totalmem, freemem, cachedmem;
		if(dotest(PAGE_SIZE,  150000, iter)) e(5);
		getmem(&totalmem, &freemem, &cachedmem);
		if(dotest(PAGE_SIZE,  totalmem*1.5, iter)) e(6);
	}

	quit();

	return 0;
}