From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 08BD06B0055 for ; Sat, 16 May 2009 10:52:16 -0400 (EDT) Received: by yw-out-1718.google.com with SMTP id 5so1221354ywm.26 for ; Sat, 16 May 2009 07:53:05 -0700 (PDT) MIME-Version: 1.0 Date: Sat, 16 May 2009 22:53:05 +0800 Message-ID: Subject: multiple address_space mappings From: Nai Xia Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: linux-mm@kvack.org List-ID: Hi, all It may be a stupid question. But if a page (composed of contiguous blocks)on a disk was read through two different paths --- one from mmap of a regular file and another is direct reading of the block device. Can they share the same page frame ? If they can, should this page have two page->mappings ? It they cannot (I think this maybe true), how should we consider this inconsistency? Thanks ! Regards, Nai -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org