Add debug in memtool to see where it hangs

JOURNAL.md

@@ -1065,3 +1065,10 @@ With blocks of maxsize=512K it also hangs around ~57M.
 
 Maybe there is a problem in the memory segment? Can we reduce it to 1 GiB only
 and see if it has any effect?
+
+    iter=289 nblocks=228 allocated=58636K (A)
+    iter=290 nblocks=227 allocated=58412K (D)
+    iter=291 nblocks=228 allocated=58480K (A)
+    iter=292 nblocks=229 allocated=58599K (A)
+
+Has changed, but not much.

memtool.c

@@ -33,6 +33,8 @@ allocate(void)
 
 	size_t size = sizeof(struct block) + n * sizeof(uint32_t);
 
+	printf("allocating...\n");
+
 	struct block *b = malloc(size);
 
 	/* No mem */
@@ -43,6 +45,7 @@ allocate(void)
 	b->next = NULL;
 
 	/* Populate the block with some data */
+	printf("filling...\n");
 	for (long i = 0; i < n; i++)
 		b->data[i] = rand();
 
@@ -80,6 +83,7 @@ deallocate(void)
 	nblocks--;
 	nbytes -= b->size;
 
+	printf("deallocating...\n");
 	free(b);
 
 	return 0;