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=-5.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 792ECC433E1 for ; Thu, 14 May 2020 09:35:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CD8720671 for ; Thu, 14 May 2020 09:35:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=cogentembedded-com.20150623.gappssmtp.com header.i=@cogentembedded-com.20150623.gappssmtp.com header.b="eVtu+uah" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726156AbgENJfu (ORCPT ); Thu, 14 May 2020 05:35:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725935AbgENJfu (ORCPT ); Thu, 14 May 2020 05:35:50 -0400 Received: from mail-lj1-x244.google.com (mail-lj1-x244.google.com [IPv6:2a00:1450:4864:20::244]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8ACBBC061A0E for ; Thu, 14 May 2020 02:35:48 -0700 (PDT) Received: by mail-lj1-x244.google.com with SMTP id u6so2746110ljl.6 for ; Thu, 14 May 2020 02:35:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cogentembedded-com.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=T86/hv0y7BAgJ75aFy/dvx0cbN3V70JUKhyVGv5v+SE=; b=eVtu+uah7Sf+JulgCzgHMXNss1swnlz1dhsc2qk9bjYnlevMZ0Tnj2eYpa8hHrTzkd 6YButrHIwOq+lsJPkmHfVfVwRMgwIX5UorYguxKvabgoMe1OF3+PMQwWLDeA8s0T7+QO 3vQaApFX54tXuP3hZeUESmbXg2y/UFMt8DamklMimJAWNmyZcrJWf/KD9+UZ5tRfQkAX ISuRybvMkN+11K0+x3ND7PB9Zxipow7EHzXneIVyDDPsXP6kw6am0RzMJ4Xzg6DAwjLB ZP7/lN8WCPgm4qUPZwcXVBRxxwWWWHmR1BCRQpnAPw9bRhFLE11N/TxB7uux6suO1JzV gIKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=T86/hv0y7BAgJ75aFy/dvx0cbN3V70JUKhyVGv5v+SE=; b=rvW/lx6zljkWI7oiyK9lYo08EO2Qi8rogK5buoBuMWyktt/aR1Z/WVmf5z0MTe4RUC kEsfLHiqSgOz+3q8rinsmZhaVQWkuKEIg0rs5a0yNnBAklr4A1kBTm0xLCtA4hFysPFe JRi3WjpCmTGHhzsGn5l1TQgz0oDHYC6fBepEaI6a01jDgxHA4XEVlP6VGabityCMIg3e J790Il4y6xWVRZ8tC6QmWWnX9aBQy9AkrJGs5KC+PCnPplDgea7LJpNvckYq4GrsVsSA sL2CcU9cWliwIU6ly1a0tODOZMUsYRuXoMhy83tnLt3E+byTkfh7bbdtrMrY7wjWyQ56 iz2Q== X-Gm-Message-State: AOAM532LayNnU3kEazevrTxnT1b4nIQfuad4ixERhUSkgiSyZ5HI7OiF /5t48OjKqzqGPqPKDQ1dowRDV4ttnQk= X-Google-Smtp-Source: ABdhPJx5l4XNtKpw1qvszJmMsFRAuhj3l7wewTDsFC78z5yMXn6Qvi1+jRmRVAuRQbmOCJlRc4GnpQ== X-Received: by 2002:a2e:9905:: with SMTP id v5mr2251265lji.237.1589448946762; Thu, 14 May 2020 02:35:46 -0700 (PDT) Received: from ?IPv6:2a00:1fa0:428e:17ae:1023:2fd9:377b:94c8? ([2a00:1fa0:428e:17ae:1023:2fd9:377b:94c8]) by smtp.gmail.com with ESMTPSA id q21sm1792342lfe.0.2020.05.14.02.35.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 May 2020 02:35:46 -0700 (PDT) Subject: Re: [PATCH] MIPS: update tlb even if pte entry has no change To: Bibo Mao , Thomas Bogendoerfer , Andrew Morton , Paul Burton , Dmitry Korotin , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Stafford Horne , Steven Price , Anshuman Khandual , Mike Rapoport Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org References: <1589422677-11455-1-git-send-email-maobibo@loongson.cn> From: Sergei Shtylyov Message-ID: Date: Thu, 14 May 2020 12:35:35 +0300 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <1589422677-11455-1-git-send-email-maobibo@loongson.cn> Content-Type: text/plain; charset=utf-8; format=flowed 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 14.05.2020 5:17, Bibo Mao wrote: > From: bibo mao > > If there are two threads reading the same memory and tlb miss happens, > one thread fills pte entry, the other reads new pte value during page fault > handling. PTE value may be updated before page faul, so the process need Fault. > need update tlb still. > > Also this patch define flush_tlb_fix_spurious_fault as empty, since it not > necessary to flush the page for all CPUs > > Signed-off-by: Bibo Mao [...] MBR, Sergei