Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S271110AbUJVBgW (ORCPT ); Thu, 21 Oct 2004 21:36:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S271169AbUJVBbW (ORCPT ); Thu, 21 Oct 2004 21:31:22 -0400 Received: from mail-relay-4.tiscali.it ([213.205.33.44]:23735 "EHLO mail-relay-4.tiscali.it") by vger.kernel.org with ESMTP id S271176AbUJVBVc (ORCPT ); Thu, 21 Oct 2004 21:21:32 -0400 Date: Fri, 22 Oct 2004 03:22:11 +0200 From: Andrea Arcangeli To: Andrew Morton Cc: shaggy@austin.ibm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] zap_pte_range should not mark non-uptodate pages dirty Message-ID: <20041022012211.GD14325@dualathlon.random> References: <1098393346.7157.112.camel@localhost> <20041021144531.22dd0d54.akpm@osdl.org> <20041021223613.GA8756@dualathlon.random> <20041021160233.68a84971.akpm@osdl.org> <20041021232059.GE8756@dualathlon.random> <20041021164245.4abec5d2.akpm@osdl.org> <20041022003004.GA14325@dualathlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041022003004.GA14325@dualathlon.random> X-GPG-Key: 1024D/68B9CB43 13D9 8355 295F 4823 7C49 C012 DFA1 686E 68B9 CB43 X-PGP-Key: 1024R/CB4660B9 CC A0 71 81 F4 A0 63 AC C0 4B 81 1D 8C 15 C8 E5 User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 818 Lines: 15 On Fri, Oct 22, 2004 at 02:30:04AM +0200, Andrea Arcangeli wrote: > If you want to shootdown ptes before clearing the bitflag, that's fine small correction s/before/after/. doing the pte shootdown before clearing the uptodate bitflag, would still not guarantee to read uptodate data after the invalidate (a minor page fault could still happen between the shootdown and the clear_bit; while after clearing the uptodate bit a major fault hitting the disk and refreshing the pagecache contents will be guaranteed - modulo bhs, well at least nfs is sure ok in that respect ;). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/