diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 764e9d9c0830c152de4c78f1f56a3d8f6e40c7a1..97326458b340e89ca5cca7d590dad07c463fddb3 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -50,6 +50,11 @@ struct ashmem_area {
 	struct file *file;
 	size_t size;
 	unsigned long prot_mask;
+#ifdef CONFIG_MEM_PURGEABLE
+	bool is_purgeable;
+	atomic_t ref_count;
+	bool purged;
+#endif
 };
 
 /**
@@ -275,7 +280,11 @@ static int ashmem_open(struct inode *inode, struct file *file)
 	memcpy(asma->name, ASHMEM_NAME_PREFIX, ASHMEM_NAME_PREFIX_LEN);
 	asma->prot_mask = PROT_MASK;
 	file->private_data = asma;
-
+#ifdef CONFIG_MEM_PURGEABLE
+	asma->is_purgeable = false;
+	atomic_set(&asma->ref_count, 1);
+	asma->purged = false;
+#endif
 	return 0;
 }
 
@@ -506,6 +515,11 @@ ashmem_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
 		get_file(f);
 		atomic_inc(&ashmem_shrink_inflight);
 		range->purged = ASHMEM_WAS_PURGED;
+#ifdef CONFIG_MEM_PURGEABLE
+		if(range->asma->is_purgeable) {
+			range->asma->purged = true;
+		}
+#endif
 		lru_del(range);
 
 		freed += range_size(range);
@@ -647,7 +661,15 @@ static int ashmem_pin(struct ashmem_area *asma, size_t pgstart, size_t pgend,
 {
 	struct ashmem_range *range, *next;
 	int ret = ASHMEM_NOT_PURGED;
-
+#ifdef CONFIG_MEM_PURGEABLE
+	if (asma && asma->is_purgeable) {
+		atomic_inc(&asma->ref_count);
+		if (atomic_read(&asma->ref_count) > 1) {
+			ret =  PM_SUCCESS;
+			return ret;
+		}
+	}
+#endif
 	list_for_each_entry_safe(range, next, &asma->unpinned_list, unpinned) {
 		/* moved past last applicable page; we can short circuit */
 		if (range_before_page(range, pgstart))
@@ -716,6 +738,17 @@ static int ashmem_unpin(struct ashmem_area *asma, size_t pgstart, size_t pgend,
 	struct ashmem_range *range, *next;
 	unsigned int purged = ASHMEM_NOT_PURGED;
 
+#ifdef CONFIG_MEM_PURGEABLE
+	if (asma && asma->is_purgeable) {
+		if (atomic_read(&asma->ref_count) > 0 && !atomic_dec_and_test(&asma->ref_count)) {
+			return PM_SUCCESS;
+		}
+		if (atomic_read(&asma->ref_count) < 0) {
+			atomic_set(&asma->ref_count, 0);
+		}
+	}
+#endif
+
 restart:
 	list_for_each_entry_safe(range, next, &asma->unpinned_list, unpinned) {
 		/* short circuit: this is our insertion point */
@@ -752,7 +785,11 @@ static int ashmem_get_pin_status(struct ashmem_area *asma, size_t pgstart,
 {
 	struct ashmem_range *range;
 	int ret = ASHMEM_IS_PINNED;
-
+#ifdef CONFIG_MEM_PURGEABLE
+	if(asma && asma->is_purgeable) {
+		return atomic_read(&asma->ref_count);
+	}
+#endif
 	list_for_each_entry(range, &asma->unpinned_list, unpinned) {
 		if (range_before_page(range, pgstart))
 			break;
@@ -785,6 +822,13 @@ static int ashmem_pin_unpin(struct ashmem_area *asma, unsigned long cmd,
 	mutex_lock(&ashmem_mutex);
 	wait_event(ashmem_shrink_wait, !atomic_read(&ashmem_shrink_inflight));
 
+#ifdef CONFIG_MEM_PURGEABLE
+	if (asma && asma->is_purgeable) {
+		pin.offset = 0;
+		pin.len = PAGE_ALIGN(asma->size);
+	}
+#endif
+
 	if (!asma->file)
 		goto out_unlock;
 
@@ -823,12 +867,34 @@ static int ashmem_pin_unpin(struct ashmem_area *asma, unsigned long cmd,
 
 	return ret;
 }
-
+#ifdef CONFIG_MEM_PURGEABLE
+static long purgeable_ashmem_cmd(struct ashmem_area *asma, unsigned int cmd)
+{
+	int ret = -EINVAL;
+	if(asma == NULL || !asma->is_purgeable) {
+		return ret;
+	}
+	mutex_lock(&ashmem_mutex);
+	switch (cmd) {
+		case ASHMEM_GET_PURGEABLE:
+			ret = asma->is_purgeable;
+			break;
+		case PURGEABLE_ASHMEM_IS_PURGED:
+			ret = asma->purged;
+			break;
+		case PURGEABLE_ASHMEM_REBUILD_SUCCESS:
+			asma->purged = false;
+			ret = PM_SUCCESS;
+			break;
+	}
+	mutex_unlock(&ashmem_mutex);
+	return ret;
+}
+#endif
 static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct ashmem_area *asma = file->private_data;
 	long ret = -ENOTTY;
-
 	switch (cmd) {
 	case ASHMEM_SET_NAME:
 		ret = set_name(asma, (void __user *)arg);
@@ -870,8 +936,22 @@ static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			ashmem_shrink_scan(&ashmem_shrinker, &sc);
 		}
 		break;
+#ifdef CONFIG_MEM_PURGEABLE
+	case ASHMEM_SET_PURGEABLE:
+		mutex_lock(&ashmem_mutex);
+		if(asma) {
+			asma->is_purgeable = true;
+			ret = PM_SUCCESS;
+		}
+		mutex_unlock(&ashmem_mutex);
+		break;
+	case ASHMEM_GET_PURGEABLE:
+	case PURGEABLE_ASHMEM_IS_PURGED:
+	case PURGEABLE_ASHMEM_REBUILD_SUCCESS:
+		ret = purgeable_ashmem_cmd(asma, cmd);
+		break;
+#endif
 	}
-
 	return ret;
 }
 
diff --git a/drivers/staging/android/uapi/ashmem.h b/drivers/staging/android/uapi/ashmem.h
index 5442e0019dcd933213e17d95297ad6c4dba47007..296b7cf14d5e6fefa5dfadeeeb89046685e76d57 100644
--- a/drivers/staging/android/uapi/ashmem.h
+++ b/drivers/staging/android/uapi/ashmem.h
@@ -24,6 +24,13 @@
 #define ASHMEM_IS_UNPINNED	0
 #define ASHMEM_IS_PINNED	1
 
+#ifdef CONFIG_MEM_PURGEABLE
+#define PM_SUCCESS	0
+#define PM_FAIL	1
+#define ASHMEM_NOT_PURGEABLE	0
+#define ASHMEM_WAS_PURGEABLE	1
+#endif
+
 struct ashmem_pin {
 	__u32 offset;	/* offset into region, in bytes, page-aligned */
 	__u32 len;	/* length forward from offset, in bytes, page-aligned */
@@ -42,4 +49,11 @@ struct ashmem_pin {
 #define ASHMEM_GET_PIN_STATUS	_IO(__ASHMEMIOC, 9)
 #define ASHMEM_PURGE_ALL_CACHES	_IO(__ASHMEMIOC, 10)
 
+#ifdef CONFIG_MEM_PURGEABLE
+#define ASHMEM_SET_PURGEABLE		_IO(__ASHMEMIOC, 11)
+#define ASHMEM_GET_PURGEABLE		_IO(__ASHMEMIOC, 12)
+#define PURGEABLE_ASHMEM_IS_PURGED		_IO(__ASHMEMIOC, 13)
+#define PURGEABLE_ASHMEM_REBUILD_SUCCESS		_IO(__ASHMEMIOC, 14)
+#endif
+
 #endif	/* _UAPI_LINUX_ASHMEM_H */