Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263790AbTEMXQH (ORCPT ); Tue, 13 May 2003 19:16:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263791AbTEMXQG (ORCPT ); Tue, 13 May 2003 19:16:06 -0400 Received: from pixpat.austin.ibm.com ([192.35.232.241]:14279 "EHLO baldur.austin.ibm.com") by vger.kernel.org with ESMTP id S263790AbTEMXQF (ORCPT ); Tue, 13 May 2003 19:16:05 -0400 Date: Tue, 13 May 2003 18:28:20 -0500 From: Dave McCracken To: William Lee Irwin III cc: "Mika Penttil?" , Linux Memory Management , Linux Kernel Subject: Re: Race between vmtruncate and mapped areas? Message-ID: <266860000.1052868500@baldur.austin.ibm.com> In-Reply-To: <20030513232038.GB8978@holomorphy.com> References: <154080000.1052858685@baldur.austin.ibm.com> <3EC15C6D.1040403@kolumbus.fi> <199610000.1052864784@baldur.austin.ibm.com> <20030513224929.GX8978@holomorphy.com> <220550000.1052866808@baldur.austin.ibm.com> <20030513231139.GZ8978@holomorphy.com> <247390000.1052867776@baldur.austin.ibm.com> <20030513232038.GB8978@holomorphy.com> X-Mailer: Mulberry/2.2.1 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 856 Lines: 22 --On Tuesday, May 13, 2003 16:20:38 -0700 William Lee Irwin III wrote: > The mmap_sem works because then ->i_size can't be sampled by > filemap_nopage() before the pagetable wiping operation starts. So why isn't that the right way to do it? Waiting for mmap_sem guarantees we won't catch a page fault in flight, which is the cause of the problem in the first place. Dave ====================================================================== Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059 dmccr@us.ibm.com T/L 678-3059 - 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/