diff --git a/kernel/pager.c b/kernel/pager.c
index 2fc1a72..bbffba7 100644
--- a/kernel/pager.c
+++ b/kernel/pager.c
@@ -65,7 +65,8 @@
  * the mlockcntnr structure is used.
  * The mlockcntnr keeps the list of 
  */
-#define MLOCKADDRS_SIZE	128
+//#define MLOCKADDRS_SIZE	128
+#define MLOCKADDRS_SIZE	8
 struct addrpair {
 	unsigned long	start;
 	unsigned long	end;
@@ -296,6 +297,8 @@ pager_open(struct swapinfo *si, char *fname, int flag, int mode)
 {
 	int	fd;
 	copy_to_user(si->udata_buf, fname, strlen(fname) + 1);
+//	kprintf("%s: copy_to_user si->udata_buf:%s,fname:%s\n",
+//		__FUNCTION__, si->udata_buf, fname);
 	fd = linux_open(si->udata_buf, flag, mode);
 	return fd;
 }
@@ -304,6 +307,8 @@ static int
 pager_unlink(struct swapinfo *si, char *fname)
 {
 	copy_to_user(si->udata_buf, fname, strlen(fname) + 1);
+//	kprintf("%s: copy_to_user si->udata_buf:%s,fname:%s\n",
+//		__FUNCTION__, si->udata_buf, fname);
 	return linux_unlink(si->udata_buf);
 }
 
@@ -403,6 +408,9 @@ mlocklist_morereq(struct swapinfo *si, unsigned long *start)
 {
 	struct areaent	went,*ent = si->mlock_area.tail;
 	copy_from_user(&went, ent, sizeof(struct areaent));
+//	kprintf("%s: copy_from_user went.count:%d,ent->count:%d\n",
+//		__FUNCTION__, went.count, ent->count);	//test case 1
+
 
 	dkprintf("mlocklist_morereq: start = %ld and = %ld\n",
 		went.pair[went.count].start, went.pair[went.count].end);
@@ -421,6 +429,8 @@ arealist_alloc(struct swapinfo *si, struct arealist *areap)
 	if (areap->head == NULL) return -ENOMEM;
 	memset(&went, 0, sizeof(struct areaent));
 	copy_to_user(areap->head, &went, sizeof(struct areaent));
+//	kprintf("%s: copy_to_user went.count:%d,areap->head->count:%d\n",
+//		__FUNCTION__, went.count, areap->head->count);	//test case 
 	return 0;
 }
 
@@ -465,6 +475,8 @@ arealist_get(struct swapinfo *si, struct addrpair **pair, struct arealist *area)
 	memset(&wtmp, 0, sizeof(struct areaent));
 	copy_to_user(tmp, &wtmp, sizeof(struct areaent));
 	copy_to_user(&(area->tail->next), &tmp, sizeof(struct areaent *));
+//	kprintf("%s: copy_to_user wtmp.count:%d,tmp->count:%d area->tail->next %x:%x\n",
+//		__FUNCTION__, wtmp.count, tmp->count, area->tail->next, tmp);	//test case 
 
 	area->tail = tmp;
 	if (pair) *pair = area->tail->pair;
@@ -476,8 +488,13 @@ arealist_update(int cnt, struct arealist *area)
 {
 	int i;
 	copy_from_user(&i, &(area->tail->count), sizeof(int));
+//	kprintf("%s: copy_from_user i:%d, area->tail->count:%d\n",
+//		__FUNCTION__, i, area->tail->count); //test case 2
+
 	i += cnt;
 	copy_to_user(&(area->tail->count), &i, sizeof(int));
+	kprintf("%s: copy_to_user i:%d, area->tail->count:%d\n",
+		__FUNCTION__, i, area->tail->count);	//test case 
 	area->count += cnt;
 }
 
@@ -492,6 +509,8 @@ arealist_add(struct swapinfo *si, unsigned long start, unsigned long end,
 	if (cc < 0) return -1;
 	waddr.start = start; waddr.end = end; waddr.flag = flag;
 	copy_to_user(addr, &waddr, sizeof(struct addrpair));
+	kprintf("%s: copy_to_user addr->start:%x, waddr.start:%x\n",
+		__FUNCTION__, addr->start, waddr.start);	//test case 
 	
 	arealist_update(1, area);
 	return 0;
@@ -510,11 +529,17 @@ arealist_preparewrite(struct arealist *areap, struct swap_areainfo *info,
 	for (ent = areap->head; ent != NULL; ent = ent->next) {
 		int i;
 		copy_from_user(&went, ent, sizeof(struct areaent));
+//		kprintf("%s: copy_from_user went.count:%d,ent->count:%d\n",
+//			__FUNCTION__, went.count, ent->count); //test case 3
+
 		for (i = 0; i < went.count; i++, count++) {
 			ssize_t sz = went.pair[i].end - went.pair[i].start; 
 			copy_to_user(&(info[count].start), &(went.pair[i].start), sizeof(unsigned long));
 			copy_to_user(&(info[count].end), &(went.pair[i].end), sizeof(unsigned long));
 			copy_to_user(&(info[count].flag), &(went.pair[i].flag), sizeof(unsigned long));
+//			kprintf("%s: copy_to_user info[%d].start:%x,end:%x,flag:%x ,went.pair[%d].start:%x,end:%x,flag:%x\n",
+//		__FUNCTION__, count, info[count].start, info[count].end, info[count].flag,
+//		i, went.pair[i].start, went.pair[i].end, went.pair[i].flag);	//test case 
 			if (flag) { /* position in file */
 				
 				pos = off + totsz;
@@ -526,6 +551,8 @@ arealist_preparewrite(struct arealist *areap, struct swap_areainfo *info,
 				}
 			}
 			copy_to_user(&(info[count].pos), &pos, sizeof(unsigned long));
+//			kprintf("%s: copy_to_user info[%d].pos:%x,pos:%x\n",
+//				__FUNCTION__, count, info[count].pos, pos);
 			totsz += sz;
 		}
 	}
@@ -675,8 +702,10 @@ do_pagein(int flag)
 		// ihk_mc_pt_print_pte(vm->address_space->page_table, (void*) si->swap_info[i].start);
 	}
 	linux_close(fd);
+#if 0
 	print_region("after pagin", vm);
 	dkprintf("do_pagein: done, currss(%lx)\n", vm->currss);
+#endif
 	vm->swapinfo = NULL;
 	kfree(si->swapfname);
 	kfree(si);
@@ -742,6 +771,8 @@ do_pageout(char *fname, void *buf, size_t size, int flag)
 	}
 
 	copy_to_user(si->udata_buf, si->swapfname, strlen(si->swapfname) + 1);
+	kprintf("%s: copy_to_user si->udata_buf:%s,si->swapfname:%s\n",
+		__FUNCTION__, si->udata_buf, si->swapfname);
 	fd = linux_open(si->udata_buf, O_RDWR|O_CREAT|O_TRUNC, 0600);
 	if (fd < 0) {
 		ekprintf("do_pageout: Cannot open/create file: %s\n", fname);
@@ -807,8 +838,10 @@ do_pageout(char *fname, void *buf, size_t size, int flag)
 			}
 		}
 	}
+#if 0
 	arealist_print("SWAP", &si->swap_area, si->swap_area.count);
 	arealist_print("MLOCK", &si->mlock_area, si->mlock_area.count);
+#endif
 	si->swap_info = myalloc(si, sizeof(struct swap_areainfo)* si->swap_area.count);
 	si->mlock_info =  myalloc(si, sizeof(struct swap_areainfo)* si->mlock_area.count);
 	if (si->swap_info == NULL || si->mlock_info == NULL) goto nomem;
@@ -819,6 +852,8 @@ do_pageout(char *fname, void *buf, size_t size, int flag)
 	copy_to_user(&(si->swphdr->version), MCKERNEL_SWAP_VERSION, SWAP_HLEN);
 	copy_to_user(&(si->swphdr->count_sarea), &(si->swap_area.count), sizeof(unsigned int));
 	copy_to_user(&(si->swphdr->count_marea), &(si->mlock_area.count), sizeof(unsigned int));
+	kprintf("%s: copy_to_user si->swphdr->magic:%s,si->swphdr->version:%s,si->swphdr->count_sarea:%d,si->swphdr->count_marea:%d,si->swap_area.count:%d,si->mlock_area.count:%d\n",
+				__FUNCTION__, si->swphdr->magic, si->swphdr->version, si->swphdr->count_sarea, si->swphdr->count_marea, si->swap_area.count, si->mlock_area.count);
 	if ((cc = pager_write(fd, si->swphdr, sizeof(struct swap_header)))
 	    != sizeof(struct swap_header)) {
 		if (cc >= 0)
@@ -844,6 +879,9 @@ do_pageout(char *fname, void *buf, size_t size, int flag)
 	for (i = 0; i < si->swap_area.count; i++) {
 		struct swap_areainfo sw_info;
 		copy_from_user(&sw_info, &(si->swap_info[i]), sizeof(struct swap_areainfo));
+//		kprintf("%s:1 copy_from_user %x:%x\n",
+//		__FUNCTION__, sw_info.start, si->swap_info[i].start); // test case 4
+
 		sz = sw_info.end - sw_info.start;
 		if ((cc = pager_write(fd, (void*) sw_info.start, sz)) != sz) {
 			if (cc >= 0)
@@ -859,6 +897,9 @@ do_pageout(char *fname, void *buf, size_t size, int flag)
 	for (i = 0; i < si->swap_area.count; i++) {
 		struct swap_areainfo sw_info;
 		copy_from_user(&sw_info, &(si->swap_info[i]), sizeof(struct swap_areainfo));
+//		kprintf("%s:2 copy_from_user %x:%x\n",
+//		__FUNCTION__, sw_info.start, si->swap_info[i].start); // test case 4
+
 		cc = ihk_mc_pt_free_range(vm->address_space->page_table,
 					  vm,
 					  (void*) sw_info.start,
@@ -880,6 +921,9 @@ do_pageout(char *fname, void *buf, size_t size, int flag)
 	for (i = 0; i < si->swap_area.count; i++) {
 		struct swap_areainfo sw_info;
 		copy_from_user(&sw_info, &(si->swap_info[i]), sizeof(struct swap_areainfo));
+//		kprintf("%s:3 copy_from_user %x:%x\n",
+//		__FUNCTION__, sw_info.start, si->swap_info[i].start); // test case 4
+
 		sz = sw_info.end - sw_info.start;
 		cc = linux_munmap((void*) sw_info.start, sz, 0);
 		if (cc < 0) {
