mwr.c

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/* malloc wont release.c */

#include <unistd.h>
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>

#define NUM 10000000
//#define MALLOC_SIZE 128

int main(int a, char *b[])
{
	char cmd[128];
	void **memtab = (void **)malloc(sizeof(void *) * NUM);

	int i;
	for (i = 0; i < NUM; i++) {
		memtab[i] = malloc(MALLOC_SIZE);
	}
	for (i = 0; i < NUM; i++) {
		free(memtab[i]);
	}

	void *first_address = memtab[0];
	void *last_address = memtab[NUM - 1];

	free(memtab);

	printf("done\n");
	snprintf(cmd, sizeof(cmd) - 1,
		 "grep -e ^Pss -e ^Rss /proc/%d/smaps_rollup", getpid());
	system(cmd);
	getchar();

	malloc_trim(0);
	printf("after malloc_trim:\n");
	system(cmd);
	getchar();

	return 0;
}