From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89DBEC63685 for ; Thu, 13 Sep 2018 18:49:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 408B420853 for ; Thu, 13 Sep 2018 18:49:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 408B420853 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728369AbeINAAN (ORCPT ); Thu, 13 Sep 2018 20:00:13 -0400 Received: from mga14.intel.com ([192.55.52.115]:32937 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727710AbeINAAN (ORCPT ); Thu, 13 Sep 2018 20:00:13 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Sep 2018 11:49:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,370,1531810800"; d="scan'208";a="73000952" Received: from davehex.jf.intel.com (HELO [172.16.44.168]) ([10.7.198.90]) by orsmga008.jf.intel.com with ESMTP; 13 Sep 2018 11:49:28 -0700 Subject: Re: [RFC][PATCH 03/11] x86/mm: Page size aware flush_tlb_mm_range() To: Peter Zijlstra References: <20180913092110.817204997@infradead.org> <20180913092812.012757318@infradead.org> <20180913184230.GD24124@hirez.programming.kicks-ass.net> <20180913184632.GM24142@hirez.programming.kicks-ass.net> Cc: will.deacon@arm.com, aneesh.kumar@linux.vnet.ibm.com, akpm@linux-foundation.org, npiggin@gmail.com, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux@armlinux.org.uk, heiko.carstens@de.ibm.com From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@linux.intel.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180913184632.GM24142@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/13/2018 11:46 AM, Peter Zijlstra wrote: > On Thu, Sep 13, 2018 at 08:42:30PM +0200, Peter Zijlstra wrote: >>>> +#define flush_tlb_range(vma, start, end) \ >>>> + flush_tlb_mm_range((vma)->vm_mm, start, end, \ >>>> + (vma)->vm_flags & VM_HUGETLB ? PMD_SHIFT : PAGE_SHIFT) >>> This is safe. But, Couldn't this PMD_SHIFT also be PUD_SHIFT for a 1G >>> hugetlb page? >> It could be, but can we tell at that point? > I had me a look in higetlb.h, would something like so work? > > #define flush_tlb_range(vma, start, end) \ > flush_tlb_mm_range((vma)->vm_mm, start, end, \ > huge_page_shift(hstate_vma(vma))) > I think you still need the VM_HUGETLB check somewhere because hstate_vma() won't work on non-VM_HUGETLB VMAs. But, yeah, something close to that should be OK.