diff --git a/fs/direct-io.c b/fs/direct-io.c
index b912270942fa..9f34bb9b1ecb 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -104,22 +104,6 @@ struct dio {
 	unsigned cur_page_len;		/* Nr of bytes at cur_page_offset */
 	sector_t cur_page_block;	/* Where it starts */
 
-	/*
-	 * Page fetching state. These variables belong to dio_refill_pages().
-	 */
-	int curr_page;			/* changes */
-	int total_pages;		/* doesn't change */
-	unsigned long curr_user_address;/* changes */
-
-	/*
-	 * Page queue.  These variables belong to dio_refill_pages() and
-	 * dio_get_page().
-	 */
-	struct page *pages[DIO_PAGES];	/* page buffer */
-	unsigned head;			/* next page to process */
-	unsigned tail;			/* last valid page + 1 */
-	int page_errors;		/* errno from get_user_pages() */
-
 	/* BIO completion state */
 	spinlock_t bio_lock;		/* protects BIO fields below */
 	unsigned long refcount;		/* direct_io_worker() and bios */
@@ -131,6 +115,28 @@ struct dio {
 	int is_async;			/* is IO async ? */
 	int io_error;			/* IO error in completion path */
 	ssize_t result;                 /* IO result */
+
+	/*
+	 * Page fetching state. These variables belong to dio_refill_pages().
+	 */
+	int curr_page;			/* changes */
+	int total_pages;		/* doesn't change */
+	unsigned long curr_user_address;/* changes */
+
+	/*
+	 * Page queue.  These variables belong to dio_refill_pages() and
+	 * dio_get_page().
+	 */
+	unsigned head;			/* next page to process */
+	unsigned tail;			/* last valid page + 1 */
+	int page_errors;		/* errno from get_user_pages() */
+
+	/*
+	 * pages[] (and any fields placed after it) are not zeroed out at
+	 * allocation time.  Don't add new fields after pages[] unless you
+	 * wish that they not be zeroed.
+	 */
+	struct page *pages[DIO_PAGES];	/* page buffer */
 };
 
 /*
@@ -1151,10 +1157,16 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
 		}
 	}
 
-	dio = kzalloc(sizeof(*dio), GFP_KERNEL);
+	dio = kmalloc(sizeof(*dio), GFP_KERNEL);
 	retval = -ENOMEM;
 	if (!dio)
 		goto out;
+	/*
+	 * Believe it or not, zeroing out the page array caused a .5%
+	 * performance regression in a database benchmark.  So, we take
+	 * care to only zero out what's needed.
+	 */
+	memset(dio, 0, offsetof(struct dio, pages));
 
 	/*
 	 * For block device access DIO_NO_LOCKING is used,