[PATCH] nommu: add anonymous page memcg accounting

[Steven J. Magnani]

Add the necessary calls to track VM anonymous page usage.

Signed-off-by: Steven J. Magnani <steve@xxxxxxxxxxxxxxx>
---
diff -uprN a/mm/nommu.c b/mm/nommu.c
--- a/mm/nommu.c	2010-09-02 19:47:43.000000000 -0500
+++ b/mm/nommu.c	2010-09-02 20:07:02.000000000 -0500
@@ -524,8 +524,10 @@ static void delete_nommu_region(struct v
 /*
  * free a contiguous series of pages
  */
-static void free_page_series(unsigned long from, unsigned long to)
+static void free_page_series(unsigned long from, unsigned long to,
+			     const struct file *file)
 {
+	mem_cgroup_uncharge_start();
 	for (; from < to; from += PAGE_SIZE) {
 		struct page *page = virt_to_page(from);
 
@@ -534,8 +536,12 @@ static void free_page_series(unsigned lo
 		if (page_count(page) != 1)
 			kdebug("free page %p: refcount not one: %d",
 			       page, page_count(page));
+		if (!file)
+			mem_cgroup_uncharge_page(page);
+
 		put_page(page);
 	}
+	mem_cgroup_uncharge_end();
 }
 
 /*
@@ -563,7 +569,8 @@ static void __put_nommu_region(struct vm
 		 * from ramfs/tmpfs mustn't be released here */
 		if (region->vm_flags & VM_MAPPED_COPY) {
 			kdebug("free series");
-			free_page_series(region->vm_start, region->vm_top);
+			free_page_series(region->vm_start, region->vm_top,
+					 region->vm_file);
 		}
 		kmem_cache_free(vm_region_jar, region);
 	} else {
@@ -1117,9 +1124,26 @@ static int do_mmap_private(struct vm_are
 		set_page_refcounted(&pages[point]);
 
 	base = page_address(pages);
-	region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY;
+
 	region->vm_start = (unsigned long) base;
 	region->vm_end   = region->vm_start + rlen;
+
+	if (!vma->vm_file) {
+		for (point = 0; point < total; point++) {
+			int charge_failed =
+				mem_cgroup_newpage_charge(&pages[point],
+							  current->mm,
+							  GFP_KERNEL);
+			if (charge_failed) {
+				free_page_series(region->vm_start,
+						 region->vm_end, NULL);
+				region->vm_start = region->vm_end = 0;
+				goto enomem;
+			}
+		}
+	}
+
+	region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY;
 	region->vm_top   = region->vm_start + (total << PAGE_SHIFT);
 
 	vma->vm_start = region->vm_start;
@@ -1150,7 +1174,7 @@ static int do_mmap_private(struct vm_are
 	return 0;
 
 error_free:
-	free_page_series(region->vm_start, region->vm_end);
+	free_page_series(region->vm_start, region->vm_end, vma->vm_file);
 	region->vm_start = vma->vm_start = 0;
 	region->vm_end   = vma->vm_end = 0;
 	region->vm_top   = 0;
@@ -1555,7 +1579,7 @@ static int shrink_vma(struct mm_struct *
 	add_nommu_region(region);
 	up_write(&nommu_region_sem);
 
-	free_page_series(from, to);
+	free_page_series(from, to, vma->vm_file);
 	return 0;
 }
 

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