diff --git a/include/mm/paging.h b/include/mm/paging.h
index b0f5568..c4f2845 100644
--- a/include/mm/paging.h
+++ b/include/mm/paging.h
@@ -33,7 +33,7 @@
 
 #define KPAGESIZE (4 * KB)
 #define UPAGESIZE (4 * KB)
-#define USERSPACE 0x100000000
+#define USERSPACE 0x200000000
 
 //----------------------------------------------------------------------------//
 
diff --git a/kaleid/kernel/mm/paging.c b/kaleid/kernel/mm/paging.c
index b13f0c6..bbd6c46 100644
--- a/kaleid/kernel/mm/paging.c
+++ b/kaleid/kernel/mm/paging.c
@@ -201,6 +201,10 @@ void MmInitPaging(void)
                                         MmPT[index] = (ulong)curAddrPT | PRESENT | READWRITE;
                                         MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
                                     }
+                                    else {
+                                        MmPT[index] = (ulong)0;
+                                        MmPhysicalPageTable[xedni] = (ulong)0;
+                                    }
                             }
                     }
             }
@@ -292,7 +296,12 @@ void MmMapPage(void* virtualAddr, void* physicalAddr, ulong flags)
 {
     pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr);
 
-    *page = ((ulong)physicalAddr & ~((KPAGESIZE - 1) | NX)) | flags;
+    DebugLog("Request %p:%p with %lu\n", virtualAddr, physicalAddr, flags);
+    DebugLog("Page (at %p) %p : was %p\n", &page, page, *page);
+
+    *page = (ulong)physicalAddr | flags;
+
+    DebugLog("Page (at %p) %p : is %p\n", &page, page, *page);
 
     MmPhysicalPageTable[(ulong)physicalAddr
                    / ((ulong)KPAGESIZE)
diff --git a/kaleid/kernel/mm/palloc.c b/kaleid/kernel/mm/palloc.c
index 6ce3356..bd808a3 100644
--- a/kaleid/kernel/mm/palloc.c
+++ b/kaleid/kernel/mm/palloc.c
@@ -158,21 +158,32 @@ ulong MmAllocPageFrameEx(void ***frameListPtr, size_t *pageNumber, size_t size,
     ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
 
     //DebugLog("Allocating %d pages...\n", *pageNumber);
-
-    for (void *curPage = (void*)(MmPhysLastKernAddress + KPAGESIZE); curPage < (void*)phRamSize; curPage += KPAGESIZE) {
-        if (!isPageBusy(curPage)) {
-            (*frameListPtr)[curNumber] = curPage;
-            inBlock = true;
-            //DebugLog("Select page : %p\n", curPage);
-            if (++curNumber >= *pageNumber) {
-                break;
+    if (contiguous) {
+        for (void *curPage = (void*)(MmPhysLastKernAddress + KPAGESIZE); curPage < (void*)phRamSize; curPage += KPAGESIZE) {
+            if (!isPageBusy(curPage)) {
+                (*frameListPtr)[curNumber] = curPage;
+                inBlock = true;
+                //DebugLog("Select page : %p\n", curPage);
+                if (++curNumber >= *pageNumber) {
+                    break;
+                }
+            } else {
+                inBlock = false;
+            }
+            if (contiguous)
+                if (!inBlock)
+                    curNumber = 0;
+        }
+    } else {
+        for (void *curPage = (void*)(MmPhysLastKernAddress + KPAGESIZE); curPage < (void*)phRamSize; curPage += KPAGESIZE) {
+            if (!isPageBusy(curPage)) {
+                (*frameListPtr)[curNumber] = curPage;
+                //DebugLog("Select page : %p\n", curPage);
+                if (++curNumber >= *pageNumber) {
+                    break;
+                }
             }
-        } else {
-            inBlock = false;
         }
-        if (contiguous)
-            if (!inBlock)
-                curNumber = 0;
     }
 
     if (curNumber != *pageNumber) {
@@ -236,8 +247,8 @@ error_t MmMapPageFrame(ulong id, void *virtAddr, ulong flags)
         }
 
         if (id == busyPage->id) {
+            DebugLog("Map %p at %p\n", busyPage->phyAddress, virtAddr + offset);
             MmMapPage((void*)((ulong)virtAddr + offset), busyPage->phyAddress, flags);
-            //DebugLog("Map %p at %p\n", busyPage->phyAddress, virtAddr + offset);
             offset += KPAGESIZE;
         }
     }
@@ -285,18 +296,39 @@ error_t MmTestBusyPage(void)
     /* } */
 
     ulong a = KeGetTicks();
-    tab[j++] = MmAllocPageFrame(50*MB, NORMAL);
-    tab[j++] = MmAllocPageFrame(50*MB, NORMAL);
-    tab[j++] = MmAllocPageFrame(50*MB, NORMAL);
-    tab[j++] = MmAllocPageFrame(50*MB, NORMAL);
-    tab[j++] = MmAllocPageFrame(50*MB, NORMAL);
+    DebugLog("Start alloc : %lu s\n", a/1000);
+    tab[j++] = MmAllocPageFrame(30*MB, NORMAL);
     ulong b = KeGetTicks();
-
-    DebugLog("Alloc time per MB : %lu\n", (b-a)/5/5);
-
-    //printBusyPages();
+    DebugLog("End alloc : %lu s\n", b/1000);
+    DebugLog("Alloc time : %lu s\n", (b-a)/1000);
     DebugLog("Alloc : %d; Free : %d; Count : %lu Mo\n", NSuccessfulAlloc, NSuccessfulFree, MmBusyPagesSpace() / MB);
 
+    a = KeGetTicks();
+    DebugLog("Start alloc : %lu s\n", a/1000);
+    tab[j++] = MmAllocPageFrame(20*MB, NORMAL);
+    b = KeGetTicks();
+    DebugLog("End alloc : %lu s\n", b/1000);
+    DebugLog("Alloc time : %lu s\n", (b-a)/1000);
+    DebugLog("Alloc : %d; Free : %d; Count : %lu Mo\n", NSuccessfulAlloc, NSuccessfulFree, MmBusyPagesSpace() / MB);
+
+    j = 0;
+
+    a = KeGetTicks();
+    DebugLog("Start free : %lu ms\n", a);
+    MmFreePageFrame(tab[j++]);
+    b = KeGetTicks();
+    DebugLog("End free : %lu ms\n", b);
+    DebugLog("Free time : %lu ms\n", (b-a));
+    DebugLog("Alloc : %d; Free : %d; Count : %lu Mo\n", NSuccessfulAlloc, NSuccessfulFree, MmBusyPagesSpace() / MB);
+
+    a = KeGetTicks();
+    DebugLog("Start map : %lu ms\n", a);
+    MmMapPageFrame(tab[1], (void*)USERSPACE, PRESENT | USERMODE | READWRITE);
+    b = KeGetTicks();
+    DebugLog("End map : %lu ms\n", b);
+    DebugLog("Map time : %lu ms\n", (b-a));
+    //printBusyPages();
+
     DebugLog("Finished !\n");
 
     return EOK;