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=-11.9 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no 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 43C4FC47420 for ; Wed, 30 Sep 2020 01:35:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 905E82145D for ; Wed, 30 Sep 2020 01:35:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="mMaVeS2A" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 905E82145D Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BA1036B0068; Tue, 29 Sep 2020 21:35:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B78236B006C; Tue, 29 Sep 2020 21:35:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A8EFB6B006E; Tue, 29 Sep 2020 21:35:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0127.hostedemail.com [216.40.44.127]) by kanga.kvack.org (Postfix) with ESMTP id 952646B0068 for ; Tue, 29 Sep 2020 21:35:42 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 5E8E4483C for ; Wed, 30 Sep 2020 01:35:42 +0000 (UTC) X-FDA: 77318010924.18.mice50_1b0eae32718e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id 3BEAA101948ED for ; Wed, 30 Sep 2020 01:35:42 +0000 (UTC) X-HE-Tag: mice50_1b0eae32718e X-Filterd-Recvd-Size: 3240 Received: from mail-ej1-f66.google.com (mail-ej1-f66.google.com [209.85.218.66]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Wed, 30 Sep 2020 01:35:41 +0000 (UTC) Received: by mail-ej1-f66.google.com with SMTP id p15so403697ejm.7 for ; Tue, 29 Sep 2020 18:35:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ZtFBpYGVBWcjph4+4nRslST7ms1gG/x8RojOlPP7OMI=; b=mMaVeS2APZBDIkB70hEoyZsmnOJIMwL4dMiwBOlw2Wcqx+bIM2L3UFWbnblFrcDMMf tGDh4GAOiOS4TTUizsZKZm2wLJigNPuFTg0j5MWzRoOVm5SbwhoZiXamc/zsvEHcMMks Vjtcc9tyy1bptHezM8TH7zV0IoH+ujpswDfG3sDItcxD/CydRfOaKkjF8iyA5E+J4R0/ rKw7jnQ8jBiZ1EOWNceGU/p5i/Z8BZz4at0Gm3Qo1lTLo/2+4/e0UYm3RhSIlmPA1QwQ SLhDisyxG9Ilf1FtjF3sJtEh6mMGNTll3AL4/+Z+zQ7pdvLGiectYexUxB6r2xiBaRoI uBsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ZtFBpYGVBWcjph4+4nRslST7ms1gG/x8RojOlPP7OMI=; b=qQHUszwlcAfmwKiYwt3TCv6p/hcYnH5qvNnBpfp3uxuJ4JKASMsWNfzqNsMQ1bZEtx L7X3B1bHIsU1mfaqyMo64ZcanzRFhCx3ZS1ZnpKUy/7wqCeE1Ct6IuU8hmsK2jBaEOwK xBNIe6LxG4K89yYBCpJXEiM0QJ0aNP/c21SEJRSIgzIw1MaP3lq4e5QVZmKlbVTysXjI FPhrI66GlBoT3B2wXfQinkDih0CQ7/zmzaD21ZhVqe4wW2bl0OQFeXFQV3CtBrdG8kvp +2O1kHgk5UXwiKMv3aMTvI1Vy/cAaQTAuwNkCLfbZkksrjtclTF8L+7a3sn8XFj7gyFh 8gxw== X-Gm-Message-State: AOAM531ElUF0vrQsyoc0Kg7PXjUjvc0Y0rRXJntpSjOE/+hRqaB4M9hk q46Mq/d1ZVe0Y5E2hBohE4ZITl1/iTHI1o9WI0lYNw== X-Google-Smtp-Source: ABdhPJy5QlofMjhpYHwlTw22TgmBje1ZtY35FcmpCbfAMqa0DdHPS1et9APkFZ3LhmhOZLlHf9Bp+ShKwnKbbO9o3gQ= X-Received: by 2002:a17:906:c447:: with SMTP id ck7mr460541ejb.358.1601429740533; Tue, 29 Sep 2020 18:35:40 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Jann Horn Date: Wed, 30 Sep 2020 03:35:14 +0200 Message-ID: Subject: Re: [PATCH 1/4] mm/gup_benchmark: Take the mmap lock around GUP To: Andrew Morton , Linux-MM Cc: kernel list , "Eric W . Biederman" , Michel Lespinasse , Mauro Carvalho Chehab , Sakari Ailus Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000274, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Sep 30, 2020 at 3:19 AM Jann Horn wrote: > To be safe against concurrent changes to the VMA tree, we must take the > mmap lock around GUP operations (excluding the GUP-fast family of > operations, which will take the mmap lock by themselves if necessary). (Sorry, my mail setup messed up the In-Reply-To headers, so you may not see the patches threaded properly... let me know if you want me to resend.)