From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751678Ab3LLLzq (ORCPT ); Thu, 12 Dec 2013 06:55:46 -0500 Received: from cantor2.suse.de ([195.135.220.15]:56761 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751467Ab3LLLzO (ORCPT ); Thu, 12 Dec 2013 06:55:14 -0500 From: Mel Gorman To: Alex Shi Cc: H Peter Anvin , Linux-X86 , Linux-MM , LKML , Mel Gorman Subject: [PATCH 3/3] x86: mm: Account for the of CPUs that must be flushed during a TLB range flush Date: Thu, 12 Dec 2013 11:55:09 +0000 Message-Id: <1386849309-22584-4-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1386849309-22584-1-git-send-email-mgorman@suse.de> References: <1386849309-22584-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X86 TLB range flushing uses a balance point to decide if a single global TLB flush or multiple single page flushes would perform best. This patch takes into account how many CPUs must be flushed. Signed-off-by: Mel Gorman --- arch/x86/mm/tlb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 09b8cb8..0cababa 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -217,6 +217,9 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, act_entries = mm->total_vm > act_entries ? act_entries : mm->total_vm; nr_base_pages = (end - start) >> PAGE_SHIFT; + /* Take the number of CPUs to range flush into account */ + nr_base_pages *= cpumask_weight(mm_cpumask(mm)); + /* tlb_flushall_shift is on balance point, details in commit log */ if (nr_base_pages > act_entries || has_large_page(mm, start, end)) { count_vm_event(NR_TLB_LOCAL_FLUSH_ALL); -- 1.8.4