From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759670AbYA1Uaw (ORCPT ); Mon, 28 Jan 2008 15:30:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752322AbYA1U3a (ORCPT ); Mon, 28 Jan 2008 15:29:30 -0500 Received: from relay2.sgi.com ([192.48.171.30]:54530 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757608AbYA1U30 (ORCPT ); Mon, 28 Jan 2008 15:29:26 -0500 Message-Id: <20080128202924.810792591@sgi.com> References: <20080128202840.974253868@sgi.com> User-Agent: quilt/0.46-1 Date: Mon, 28 Jan 2008 12:28:46 -0800 From: Christoph Lameter To: Andrea Arcangeli Cc: Robin Holt , Avi Kivity , Izik Eidus Cc: Nick Piggin , kvm-devel@lists.sourceforge.net Cc: Benjamin Herrenschmidt , Peter Zijlstra Cc: steiner@sgi.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: daniel.blueman@quadrics.com, Hugh Dickins Subject: [patch 6/6] mmu_notifier: Add invalidate_all() Content-Disposition: inline; filename=mmu_all Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org when a task exits we can remove all external pts at once. At that point the extern mmu may also unregister itself from the mmu notifier chain to avoid future calls. Note the complications because of RCU. Other processors may not see that the notifier was unlinked until a quiescent period has passed! Signed-off-by: Christoph Lameter --- include/linux/mmu_notifier.h | 4 ++++ mm/mmap.c | 1 + 2 files changed, 5 insertions(+) Index: linux-2.6/include/linux/mmu_notifier.h =================================================================== --- linux-2.6.orig/include/linux/mmu_notifier.h 2008-01-28 11:43:03.000000000 -0800 +++ linux-2.6/include/linux/mmu_notifier.h 2008-01-28 12:21:33.000000000 -0800 @@ -62,6 +62,10 @@ struct mmu_notifier_ops { struct mm_struct *mm, unsigned long address); + /* Dummy needed because the mmu_notifier() macro requires it */ + void (*invalidate_all)(struct mmu_notifier *mn, struct mm_struct *mm, + int dummy); + /* * lock indicates that the function is called under spinlock. */ Index: linux-2.6/mm/mmap.c =================================================================== --- linux-2.6.orig/mm/mmap.c 2008-01-28 11:47:53.000000000 -0800 +++ linux-2.6/mm/mmap.c 2008-01-28 11:57:45.000000000 -0800 @@ -2034,6 +2034,7 @@ void exit_mmap(struct mm_struct *mm) unsigned long end; /* mm's last user has gone, and its about to be pulled down */ + mmu_notifier(invalidate_all, mm, 0); arch_exit_mmap(mm); lru_add_drain(); --