Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932580AbWJILpc (ORCPT ); Mon, 9 Oct 2006 07:45:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932574AbWJILpc (ORCPT ); Mon, 9 Oct 2006 07:45:32 -0400 Received: from ns2.suse.de ([195.135.220.15]:21890 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S932580AbWJILpb (ORCPT ); Mon, 9 Oct 2006 07:45:31 -0400 Date: Mon, 9 Oct 2006 13:45:27 +0200 From: Nick Piggin To: Benjamin Herrenschmidt Cc: Andrew Morton , Linux Memory Management , Linux Kernel Subject: Re: [patch 3/3] mm: fault handler to replace nopage and populate Message-ID: <20061009114527.GB26824@wotan.suse.de> References: <20061007105758.14024.70048.sendpatchset@linux.site> <20061007105853.14024.95383.sendpatchset@linux.site> <20061007134407.6aa4dd26.akpm@osdl.org> <1160351174.14601.3.camel@localhost.localdomain> <20061009102635.GC3487@wotan.suse.de> <1160391014.10229.16.camel@localhost.localdomain> <20061009110007.GA3592@wotan.suse.de> <1160392214.10229.19.camel@localhost.localdomain> <20061009111906.GA26824@wotan.suse.de> <1160393579.10229.24.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1160393579.10229.24.camel@localhost.localdomain> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1027 Lines: 24 On Mon, Oct 09, 2006 at 09:32:59PM +1000, Benjamin Herrenschmidt wrote: > > > > You'll want to clear VM_PFNMAP after unmapping all pages from it, before > > switching to struct page backing. > > Which means having a list of all vma's ... I suppose I can look at the > truncate code to do that race free but I was hoping I could avoid it > (that's the whole point of using unmap_mapping_range() in fact). Yeah I don't think there is any other way to do it. > > > It also needs update_mmu_cache() I suppose. > > > > Hmm, but it might not be called from a pagefault. Can we get away > > with not calling it? Or is it required by some architectures? > > I think some architectures might be upset if it's not called... But would any get upset if it is called from !pagefault path? - 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/