From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx136.postini.com [74.125.245.136]) by kanga.kvack.org (Postfix) with SMTP id A4C876B0082 for ; Wed, 21 Nov 2012 05:22:07 -0500 (EST) From: Mel Gorman Subject: [PATCH 05/46] mm: Only flush the TLB when clearing an accessible pte Date: Wed, 21 Nov 2012 10:21:11 +0000 Message-Id: <1353493312-8069-6-git-send-email-mgorman@suse.de> In-Reply-To: <1353493312-8069-1-git-send-email-mgorman@suse.de> References: <1353493312-8069-1-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Peter Zijlstra , Andrea Arcangeli , Ingo Molnar Cc: Rik van Riel , Johannes Weiner , Hugh Dickins , Thomas Gleixner , Paul Turner , Lee Schermerhorn , Alex Shi , Linus Torvalds , Andrew Morton , Linux-MM , LKML , Mel Gorman From: Rik van Riel 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 Link: http://lkml.kernel.org/n/tip-vm3rkzevahelwhejx5uwm8ex@git.kernel.org Signed-off-by: Ingo Molnar --- mm/pgtable-generic.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index d8397da..0c8323f 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 -- 1.7.9.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org