[PATCH] speed up /proc/pid/statm for !CONFIG_PROC_FS

Remove the accounting overhead when CONFIG_PROC_FS is not defined.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/mm.h

@@ -752,7 +752,15 @@ extern struct page * follow_page(struct mm_struct *mm, unsigned long address,
 		int write);
 extern int remap_page_range(struct vm_area_struct *vma, unsigned long from,
 		unsigned long to, unsigned long size, pgprot_t prot);
+
+#ifdef CONFIG_PROC_FS
 void __vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
+#else
+static inline void __vm_stat_account(struct mm_struct *mm,
+			unsigned long flags, struct file *file, long pages)
+{
+}
+#endif /* CONFIG_PROC_FS */
 
 static inline void vm_stat_account(struct vm_area_struct *vma)
 {

mm/mmap.c

@@ -729,6 +729,7 @@ struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma)
 	return NULL;
 }
 
+#ifdef CONFIG_PROC_FS
 void __vm_stat_account(struct mm_struct *mm, unsigned long flags,
 						struct file *file, long pages)
 {
@@ -750,6 +751,7 @@ void __vm_stat_account(struct mm_struct *mm, unsigned long flags,
 	if (flags & VM_EXEC)
 		mm->exec_vm += pages;
 }
+#endif /* CONFIG_PROC_FS */
 
 /*
  * The caller must hold down_write(current->mm->mmap_sem).