Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762331AbYA1Ubd (ORCPT ); Mon, 28 Jan 2008 15:31:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758025AbYA1U3d (ORCPT ); Mon, 28 Jan 2008 15:29:33 -0500 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:48432 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757561AbYA1U30 (ORCPT ); Mon, 28 Jan 2008 15:29:26 -0500 Message-Id: <20080128202924.334342410@sgi.com> References: <20080128202840.974253868@sgi.com> User-Agent: quilt/0.46-1 Date: Mon, 28 Jan 2008 12:28:44 -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 4/6] MMU notifier: invalidate_page callbacks using Linux rmaps Content-Disposition: inline; filename=mmu_invalidate_page_callbacks Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2639 Lines: 71 These notifiers here use the Linux rmaps to perform the callbacks. In order to walk the rmaps locks must be held. Callbacks can therefore only operate in an atomic context. Signed-off-by: Christoph Lameter --- mm/rmap.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) Index: linux-2.6/mm/rmap.c =================================================================== --- linux-2.6.orig/mm/rmap.c 2008-01-25 14:27:01.000000000 -0800 +++ linux-2.6/mm/rmap.c 2008-01-25 14:27:04.000000000 -0800 @@ -288,6 +288,9 @@ static int page_referenced_one(struct pa if (ptep_clear_flush_young(vma, address, pte)) referenced++; + if (mmu_notifier_age_page(mm, address)) + referenced++; + /* Pretend the page is referenced if the task has the swap token and is in the middle of a page fault. */ if (mm != current->mm && has_swap_token(mm) && @@ -435,6 +438,7 @@ static int page_mkclean_one(struct page flush_cache_page(vma, address, pte_pfn(*pte)); entry = ptep_clear_flush(vma, address, pte); + mmu_notifier(invalidate_page, mm, address); entry = pte_wrprotect(entry); entry = pte_mkclean(entry); set_pte_at(mm, address, pte, entry); @@ -680,7 +684,8 @@ static int try_to_unmap_one(struct page * skipped over this mm) then we should reactivate it. */ if (!migration && ((vma->vm_flags & VM_LOCKED) || - (ptep_clear_flush_young(vma, address, pte)))) { + (ptep_clear_flush_young(vma, address, pte) || + mmu_notifier_age_page(mm, address)))) { ret = SWAP_FAIL; goto out_unmap; } @@ -688,6 +693,7 @@ static int try_to_unmap_one(struct page /* Nuke the page table entry. */ flush_cache_page(vma, address, page_to_pfn(page)); pteval = ptep_clear_flush(vma, address, pte); + mmu_notifier(invalidate_page, mm, address); /* Move the dirty bit to the physical page now the pte is gone. */ if (pte_dirty(pteval)) @@ -815,9 +821,13 @@ static void try_to_unmap_cluster(unsigne if (ptep_clear_flush_young(vma, address, pte)) continue; + if (mmu_notifier_age_page(mm, address)) + continue; + /* Nuke the page table entry. */ flush_cache_page(vma, address, pte_pfn(*pte)); pteval = ptep_clear_flush(vma, address, pte); + mmu_notifier(invalidate_page, mm, address); /* If nonlinear, store the file page offset in the pte. */ if (page->index != linear_page_index(vma, address)) -- -- 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/