From owner-freebsd-hackers Tue Jan 29 8:18:50 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from cs.rice.edu (cs.rice.edu [128.42.1.30]) by hub.freebsd.org (Postfix) with ESMTP id 439DB37B446 for ; Tue, 29 Jan 2002 08:18:39 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by cs.rice.edu (Postfix) with ESMTP id 379CF1889 for ; Tue, 29 Jan 2002 10:18:38 -0600 (CST) Received: from nevada.cs.rice.edu (nevada.cs.rice.edu [128.42.1.164]) by cs.rice.edu (Postfix) with ESMTP id 599D81806 for ; Tue, 29 Jan 2002 10:18:36 -0600 (CST) Received: from localhost (hykim@localhost) by nevada.cs.rice.edu (8.9.3+Sun/8.9.0) with ESMTP id KAA28171 for ; Tue, 29 Jan 2002 10:17:31 -0600 (CST) X-Authentication-Warning: nevada.cs.rice.edu: hykim owned process doing -bs Date: Tue, 29 Jan 2002 10:17:31 -0600 (CST) From: Hyong-Youb Kim To: Subject: another VM question Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Virus-Scanned: by AMaViS snapshot-20010714 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG First off, for each open file, does the kernel keep a unique vnode structure? If so, will it have at most one vm_object reference at any time? I am guessing that mmaping a file will create vm_object with a vnode pager that references vnode. But then under what circumstances does vnode not have a valid vm_object? Well ... also ahh what is the difference between VMIO and non-VMIO? Does the latter just mean that phyio? You can smack my head if these questions are so dumb. John To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message