diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 6c98f2b..5024ba7 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -133,6 +133,7 @@
  statm   Process memory status information              
  status  Process status in human readable form          
  wchan   If CONFIG_KALLSYMS is set, a pre-decoded wchan
+ smaps	 Extension based on maps, presenting the rss size for each mapped file
 ..............................................................................
 
 For example, to get the status information of a process, all you have to do is
diff --git a/fs/proc/base.c b/fs/proc/base.c
index b796bf9..520978e 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -11,6 +11,40 @@
  *  go into icache. We cache the reference to task_struct upon lookup too.
  *  Eventually it should become a filesystem in its own. We don't use the
  *  rest of procfs anymore.
+ *
+ *
+ *  Changelog:
+ *  17-Jan-2005
+ *  Allan Bezerra
+ *  Bruna Moreira <bruna.moreira@indt.org.br>
+ *  Edjard Mota <edjard.mota@indt.org.br>
+ *  Ilias Biris <ilias.biris@indt.org.br>
+ *  Mauricio Lin <mauricio.lin@indt.org.br>
+ *
+ *  Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
+ *
+ *  A new process specific entry (smaps) included in /proc. It shows the
+ *  size of rss for each memory area. The maps entry lacks information
+ *  about physical memory size (rss) for each mapped file, i.e.,
+ *  rss information for executables and library files.
+ *  This additional information is useful for any tools that need to know
+ *  about physical memory consumption for a process specific library.
+ *
+ *  Changelog:
+ *  21-Feb-2005
+ *  Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
+ *  Pud inclusion in the page table walking.
+ *
+ *  ChangeLog:
+ *  10-Mar-2005
+ *  10LE Instituto Nokia de Tecnologia - INdT:
+ *  A better way to walks through the page table as suggested by Hugh Dickins.
+ *
+ *  Simo Piiroinen <simo.piiroinen@nokia.com>:
+ *  Smaps information related to shared, private, clean and dirty pages.
+ *
+ *  Paul Mundt <paul.mundt@nokia.com>:
+ *  Overall revision about smaps.
  */
 
 #include <asm/uaccess.h>
@@ -68,6 +102,7 @@
 	PROC_TGID_NUMA_MAPS,
 	PROC_TGID_MOUNTS,
 	PROC_TGID_WCHAN,
+	PROC_TGID_SMAPS,
 #ifdef CONFIG_SCHEDSTATS
 	PROC_TGID_SCHEDSTAT,
 #endif
@@ -106,6 +141,7 @@
 	PROC_TID_NUMA_MAPS,
 	PROC_TID_MOUNTS,
 	PROC_TID_WCHAN,
+	PROC_TID_SMAPS,
 #ifdef CONFIG_SCHEDSTATS
 	PROC_TID_SCHEDSTAT,
 #endif
@@ -157,6 +193,7 @@
 	E(PROC_TGID_ROOT,      "root",    S_IFLNK|S_IRWXUGO),
 	E(PROC_TGID_EXE,       "exe",     S_IFLNK|S_IRWXUGO),
 	E(PROC_TGID_MOUNTS,    "mounts",  S_IFREG|S_IRUGO),
+	E(PROC_TGID_SMAPS,     "smaps",   S_IFREG|S_IRUGO),
 #ifdef CONFIG_SECURITY
 	E(PROC_TGID_ATTR,      "attr",    S_IFDIR|S_IRUGO|S_IXUGO),
 #endif
@@ -196,6 +233,7 @@
 	E(PROC_TID_ROOT,       "root",    S_IFLNK|S_IRWXUGO),
 	E(PROC_TID_EXE,        "exe",     S_IFLNK|S_IRWXUGO),
 	E(PROC_TID_MOUNTS,     "mounts",  S_IFREG|S_IRUGO),
+	E(PROC_TID_SMAPS,      "smaps",   S_IFREG|S_IRUGO),
 #ifdef CONFIG_SECURITY
 	E(PROC_TID_ATTR,       "attr",    S_IFDIR|S_IRUGO|S_IXUGO),
 #endif
@@ -544,6 +582,25 @@
 };
 #endif
 
+extern struct seq_operations proc_pid_smaps_op;
+static int smaps_open(struct inode *inode, struct file *file)
+{
+	struct task_struct *task = proc_task(inode);
+	int ret = seq_open(file, &proc_pid_smaps_op);
+	if (!ret) {
+		struct seq_file *m = file->private_data;
+		m->private = task;
+	}
+	return ret;
+}
+
+static struct file_operations proc_smaps_operations = {
+	.open		= smaps_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
 extern struct seq_operations mounts_op;
 static int mounts_open(struct inode *inode, struct file *file)
 {
@@ -1574,6 +1631,10 @@
 		case PROC_TGID_MOUNTS:
 			inode->i_fop = &proc_mounts_operations;
 			break;
+		case PROC_TID_SMAPS:
+		case PROC_TGID_SMAPS:
+			inode->i_fop = &proc_smaps_operations;
+			break;
 #ifdef CONFIG_SECURITY
 		case PROC_TID_ATTR:
 			inode->i_nlink = 2;
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 64e84ca..c7ef3e4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -2,10 +2,13 @@
 #include <linux/hugetlb.h>
 #include <linux/mount.h>
 #include <linux/seq_file.h>
+#include <linux/highmem.h>
 #include <linux/pagemap.h>
 #include <linux/mempolicy.h>
+
 #include <asm/elf.h>
 #include <asm/uaccess.h>
+#include <asm/tlbflush.h>
 #include "internal.h"
 
 char *task_mem(struct mm_struct *mm, char *buffer)
@@ -89,49 +92,58 @@
 	seq_printf(m, "%*c", len, ' ');
 }
 
-static int show_map(struct seq_file *m, void *v)
+struct mem_size_stats
+{
+	unsigned long resident;
+	unsigned long shared_clean;
+	unsigned long shared_dirty;
+	unsigned long private_clean;
+	unsigned long private_dirty;
+};
+
+static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 {
 	struct task_struct *task = m->private;
-	struct vm_area_struct *map = v;
-	struct mm_struct *mm = map->vm_mm;
-	struct file *file = map->vm_file;
-	int flags = map->vm_flags;
+	struct vm_area_struct *vma = v;
+	struct mm_struct *mm = vma->vm_mm;
+	struct file *file = vma->vm_file;
+	int flags = vma->vm_flags;
 	unsigned long ino = 0;
 	dev_t dev = 0;
 	int len;
 
 	if (file) {
-		struct inode *inode = map->vm_file->f_dentry->d_inode;
+		struct inode *inode = vma->vm_file->f_dentry->d_inode;
 		dev = inode->i_sb->s_dev;
 		ino = inode->i_ino;
 	}
 
 	seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
-			map->vm_start,
-			map->vm_end,
+			vma->vm_start,
+			vma->vm_end,
 			flags & VM_READ ? 'r' : '-',
 			flags & VM_WRITE ? 'w' : '-',
 			flags & VM_EXEC ? 'x' : '-',
 			flags & VM_MAYSHARE ? 's' : 'p',
-			map->vm_pgoff << PAGE_SHIFT,
+			vma->vm_pgoff << PAGE_SHIFT,
 			MAJOR(dev), MINOR(dev), ino, &len);
 
 	/*
 	 * Print the dentry name for named mappings, and a
 	 * special [heap] marker for the heap:
 	 */
-	if (map->vm_file) {
+	if (file) {
 		pad_len_spaces(m, len);
-		seq_path(m, file->f_vfsmnt, file->f_dentry, "");
+		seq_path(m, file->f_vfsmnt, file->f_dentry, "\n");
 	} else {
 		if (mm) {
-			if (map->vm_start <= mm->start_brk &&
-						map->vm_end >= mm->brk) {
+			if (vma->vm_start <= mm->start_brk &&
+						vma->vm_end >= mm->brk) {
 				pad_len_spaces(m, len);
 				seq_puts(m, "[heap]");
 			} else {
-				if (map->vm_start <= mm->start_stack &&
-					map->vm_end >= mm->start_stack) {
+				if (vma->vm_start <= mm->start_stack &&
+					vma->vm_end >= mm->start_stack) {
 
 					pad_len_spaces(m, len);
 					seq_puts(m, "[stack]");
@@ -143,24 +155,146 @@
 		}
 	}
 	seq_putc(m, '\n');
-	if (m->count < m->size)  /* map is copied successfully */
-		m->version = (map != get_gate_vma(task))? map->vm_start: 0;
+
+	if (mss)
+		seq_printf(m,
+			   "Size:          %8lu kB\n"
+			   "Rss:           %8lu kB\n"
+			   "Shared_Clean:  %8lu kB\n"
+			   "Shared_Dirty:  %8lu kB\n"
+			   "Private_Clean: %8lu kB\n"
+			   "Private_Dirty: %8lu kB\n",
+			   (vma->vm_end - vma->vm_start) >> 10,
+			   mss->resident >> 10,
+			   mss->shared_clean  >> 10,
+			   mss->shared_dirty  >> 10,
+			   mss->private_clean >> 10,
+			   mss->private_dirty >> 10);
+
+	if (m->count < m->size)  /* vma is copied successfully */
+		m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
 	return 0;
 }
 
+static int show_map(struct seq_file *m, void *v)
+{
+	return show_map_internal(m, v, 0);
+}
+
+static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+				unsigned long addr, unsigned long end,
+				struct mem_size_stats *mss)
+{
+	pte_t *pte, ptent;
+	unsigned long pfn;
+	struct page *page;
+
+	pte = pte_offset_map(pmd, addr);
+	do {
+		ptent = *pte;
+		if (pte_none(ptent) || !pte_present(ptent))
+			continue;
+
+		mss->resident += PAGE_SIZE;
+		pfn = pte_pfn(ptent);
+		if (!pfn_valid(pfn))
+			continue;
+
+		page = pfn_to_page(pfn);
+		if (page_count(page) >= 2) {
+			if (pte_dirty(ptent))
+				mss->shared_dirty += PAGE_SIZE;
+			else
+				mss->shared_clean += PAGE_SIZE;
+		} else {
+			if (pte_dirty(ptent))
+				mss->private_dirty += PAGE_SIZE;
+			else
+				mss->private_clean += PAGE_SIZE;
+		}
+	} while (pte++, addr += PAGE_SIZE, addr != end);
+	pte_unmap(pte - 1);
+	cond_resched_lock(&vma->vm_mm->page_table_lock);
+}
+
+static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
+				unsigned long addr, unsigned long end,
+				struct mem_size_stats *mss)
+{
+	pmd_t *pmd;
+	unsigned long next;
+
+	pmd = pmd_offset(pud, addr);
+	do {
+		next = pmd_addr_end(addr, end);
+		if (pmd_none_or_clear_bad(pmd))
+			continue;
+		smaps_pte_range(vma, pmd, addr, next, mss);
+	} while (pmd++, addr = next, addr != end);
+}
+
+static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
+				unsigned long addr, unsigned long end,
+				struct mem_size_stats *mss)
+{
+	pud_t *pud;
+	unsigned long next;
+
+	pud = pud_offset(pgd, addr);
+	do {
+		next = pud_addr_end(addr, end);
+		if (pud_none_or_clear_bad(pud))
+			continue;
+		smaps_pmd_range(vma, pud, addr, next, mss);
+	} while (pud++, addr = next, addr != end);
+}
+
+static inline void smaps_pgd_range(struct vm_area_struct *vma,
+				unsigned long addr, unsigned long end,
+				struct mem_size_stats *mss)
+{
+	pgd_t *pgd;
+	unsigned long next;
+
+	pgd = pgd_offset(vma->vm_mm, addr);
+	do {
+		next = pgd_addr_end(addr, end);
+		if (pgd_none_or_clear_bad(pgd))
+			continue;
+		smaps_pud_range(vma, pgd, addr, next, mss);
+	} while (pgd++, addr = next, addr != end);
+}
+
+static int show_smap(struct seq_file *m, void *v)
+{
+	struct vm_area_struct *vma = v;
+	struct mm_struct *mm = vma->vm_mm;
+	struct mem_size_stats mss;
+
+	memset(&mss, 0, sizeof mss);
+
+	if (mm) {
+		spin_lock(&mm->page_table_lock);
+		smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
+		spin_unlock(&mm->page_table_lock);
+	}
+
+	return show_map_internal(m, v, &mss);
+}
+
 static void *m_start(struct seq_file *m, loff_t *pos)
 {
 	struct task_struct *task = m->private;
 	unsigned long last_addr = m->version;
 	struct mm_struct *mm;
-	struct vm_area_struct *map, *tail_map;
+	struct vm_area_struct *vma, *tail_vma;
 	loff_t l = *pos;
 
 	/*
 	 * We remember last_addr rather than next_addr to hit with
 	 * mmap_cache most of the time. We have zero last_addr at
-	 * the begining and also after lseek. We will have -1 last_addr
-	 * after the end of the maps.
+	 * the beginning and also after lseek. We will have -1 last_addr
+	 * after the end of the vmas.
 	 */
 
 	if (last_addr == -1UL)
@@ -170,47 +304,47 @@
 	if (!mm)
 		return NULL;
 
-	tail_map = get_gate_vma(task);
+	tail_vma = get_gate_vma(task);
 	down_read(&mm->mmap_sem);
 
 	/* Start with last addr hint */
-	if (last_addr && (map = find_vma(mm, last_addr))) {
-		map = map->vm_next;
+	if (last_addr && (vma = find_vma(mm, last_addr))) {
+		vma = vma->vm_next;
 		goto out;
 	}
 
 	/*
-	 * Check the map index is within the range and do
+	 * Check the vma index is within the range and do
 	 * sequential scan until m_index.
 	 */
-	map = NULL;
+	vma = NULL;
 	if ((unsigned long)l < mm->map_count) {
-		map = mm->mmap;
-		while (l-- && map)
-			map = map->vm_next;
+		vma = mm->mmap;
+		while (l-- && vma)
+			vma = vma->vm_next;
 		goto out;
 	}
 
 	if (l != mm->map_count)
-		tail_map = NULL; /* After gate map */
+		tail_vma = NULL; /* After gate vma */
 
 out:
-	if (map)
-		return map;
+	if (vma)
+		return vma;
 
-	/* End of maps has reached */
-	m->version = (tail_map != NULL)? 0: -1UL;
+	/* End of vmas has been reached */
+	m->version = (tail_vma != NULL)? 0: -1UL;
 	up_read(&mm->mmap_sem);
 	mmput(mm);
-	return tail_map;
+	return tail_vma;
 }
 
 static void m_stop(struct seq_file *m, void *v)
 {
 	struct task_struct *task = m->private;
-	struct vm_area_struct *map = v;
-	if (map && map != get_gate_vma(task)) {
-		struct mm_struct *mm = map->vm_mm;
+	struct vm_area_struct *vma = v;
+	if (vma && vma != get_gate_vma(task)) {
+		struct mm_struct *mm = vma->vm_mm;
 		up_read(&mm->mmap_sem);
 		mmput(mm);
 	}
@@ -219,14 +353,14 @@
 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	struct task_struct *task = m->private;
-	struct vm_area_struct *map = v;
-	struct vm_area_struct *tail_map = get_gate_vma(task);
+	struct vm_area_struct *vma = v;
+	struct vm_area_struct *tail_vma = get_gate_vma(task);
 
 	(*pos)++;
-	if (map && (map != tail_map) && map->vm_next)
-		return map->vm_next;
+	if (vma && (vma != tail_vma) && vma->vm_next)
+		return vma->vm_next;
 	m_stop(m, v);
-	return (map != tail_map)? tail_map: NULL;
+	return (vma != tail_vma)? tail_vma: NULL;
 }
 
 struct seq_operations proc_pid_maps_op = {
@@ -236,6 +370,13 @@
 	.show	= show_map
 };
 
+struct seq_operations proc_pid_smaps_op = {
+	.start	= m_start,
+	.next	= m_next,
+	.stop	= m_stop,
+	.show	= show_smap
+};
+
 #ifdef CONFIG_NUMA
 
 struct numa_maps {