From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755617Ab2JLLZK (ORCPT ); Fri, 12 Oct 2012 07:25:10 -0400 Received: from terminus.zytor.com ([198.137.202.10]:55618 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750922Ab2JLLZH (ORCPT ); Fri, 12 Oct 2012 07:25:07 -0400 Date: Fri, 12 Oct 2012 04:24:52 -0700 From: tip-bot for Rik van Riel Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, torvalds@linux-foundation.org, a.p.zijlstra@chello.nl, riel@redhat.com, akpm@linux-foundation.org, tglx@linutronix.de Reply-To: riel@redhat.com, mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, a.p.zijlstra@chello.nl, torvalds@linux-foundation.org, tglx@linutronix.de To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/numa] mm: Only flush the TLB when clearing an accessible pte Git-Commit-ID: 154e911b453560aa1e6e11d47e5f95289817b932 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.6 (terminus.zytor.com [127.0.0.1]); Fri, 12 Oct 2012 04:24:57 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 154e911b453560aa1e6e11d47e5f95289817b932 Gitweb: http://git.kernel.org/tip/154e911b453560aa1e6e11d47e5f95289817b932 Author: Rik van Riel AuthorDate: Tue, 9 Oct 2012 15:31:59 +0200 Committer: Ingo Molnar CommitDate: Fri, 12 Oct 2012 12:07:16 +0200 mm: Only flush the TLB when clearing an accessible pte If ptep_clear_flush() is called to clear a page table entry that is accessible anyway by the CPU, eg. a _PAGE_PROTNONE page table entry, there is no need to flush the TLB on remote CPUs. Signed-off-by: Rik van Riel Signed-off-by: Peter Zijlstra Cc: Linus Torvalds Cc: Andrew Morton Cc: Thomas Gleixner Link: http://lkml.kernel.org/n/tip-vm3rkzevahelwhejx5uwm8ex@git.kernel.org Signed-off-by: Ingo Molnar --- mm/pgtable-generic.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 74c0dda..0996d34 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -88,7 +88,8 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, { pte_t pte; pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); - flush_tlb_page(vma, address); + if (pte_accessible(pte)) + flush_tlb_page(vma, address); return pte; } #endif