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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9152FC433F5 for ; Wed, 9 Mar 2022 04:14:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F127C8D0008; Tue, 8 Mar 2022 23:14:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id EC1C08D0001; Tue, 8 Mar 2022 23:14:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DB0578D0008; Tue, 8 Mar 2022 23:14:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0129.hostedemail.com [216.40.44.129]) by kanga.kvack.org (Postfix) with ESMTP id CFA2F8D0001 for ; Tue, 8 Mar 2022 23:14:04 -0500 (EST) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 8A83C181CAC54 for ; Wed, 9 Mar 2022 04:14:04 +0000 (UTC) X-FDA: 79223530008.28.4C6E2C9 Received: from mail-pf1-f169.google.com (mail-pf1-f169.google.com [209.85.210.169]) by imf25.hostedemail.com (Postfix) with ESMTP id 254E6A0002 for ; Wed, 9 Mar 2022 04:14:04 +0000 (UTC) Received: by mail-pf1-f169.google.com with SMTP id s8so1151297pfk.12 for ; Tue, 08 Mar 2022 20:14:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=n2RwK9cIieKMhKrtyShZZPbFRUKXZafEsQW2DLOqgNU=; b=e5J+6qO9viI9tnZKacITygw6SfzgK6KtUlMYCUZs2ZHKdPyD6A3LdHoP3/6DYCIiZp 6zwUcGrlaqknuI79kJuQZCIJzcmJ7A/2R0TL+RdMZeOrXehfcPC5I7pP1+ObjPfjhLb3 FYZK6iH+iG+HBtAsqSbWtZsfor7v/KpUu0D2isLO9fHW00W705LNvY70twq8vuhs/KYt k/2AVkU3/gCcJdi4JUP3md+1kX6Jr3ujbFGzLnQUQ6jqbfQP14c3AJxYw0A08AbQO6ut QQcFZuXCbxkLfJS3mPH/9XfZow/zYa7cTz8pj5egF1QYlUcCPCkc4lji2T148VaMVRhV MyRg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=n2RwK9cIieKMhKrtyShZZPbFRUKXZafEsQW2DLOqgNU=; b=si4HOsg/X4KTWjMI4QZtedvBq/POUET1R5sor052XGNhOD4+Qk7SBm2DiRUyIETHNV yvEJmKBwqLVk0cE1w3IXjqKyRVT8X9JA+wsjIGHir+Qi35LK9NP5EC9uzLlksCiURJ6i Qq1EREFkxmTxU4e3cy+9sOOlHpNl5E7Dv7qey17lOWmadU5qu/5FrpmrtGf43TptaY9c tmQJ/7LzTcCeQTEYDIS2m61WMJ8WCD4nQvUVcJ9cNQfyTCSSdFZgaVQu26zc1gWAaRju xJR2WRLvmfxpZz/D+YwXK2jWDQxv5PAjSzXpHIAJmVtxCjA7zf/IaP/RCc932A3fos51 g3Yg== X-Gm-Message-State: AOAM532iuyC7vJZhhrXAPMih1rFO++6zU47/rx90CawzySiymHe2bIkB ZYUhBUJeDTjwCS/O/rOYQP0= X-Google-Smtp-Source: ABdhPJy02nsiNTVLqWhKJuGJNm96G/p/QKGuIv9pwJyXZ/R9WGji2HU/t+PO2wO9IoMVpmqusuDWlQ== X-Received: by 2002:a65:4101:0:b0:372:1875:c19c with SMTP id w1-20020a654101000000b003721875c19cmr16618731pgp.435.1646799242995; Tue, 08 Mar 2022 20:14:02 -0800 (PST) Received: from smtpclient.apple ([66.170.99.1]) by smtp.gmail.com with ESMTPSA id w5-20020a17090aaf8500b001bd4c825deesm4419653pjq.43.2022.03.08.20.14.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Mar 2022 20:14:02 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\)) Subject: Re: [PATCH] mm: reduce tlb flush range when changing vma protection From: Nadav Amit In-Reply-To: <20220309025721.3051365-1-maobibo@loongson.cn> Date: Tue, 8 Mar 2022 20:14:01 -0800 Cc: Andrew Morton , Linux-MM , linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Message-Id: <87861C77-F203-40A5-814D-A3541081064E@gmail.com> References: <20220309025721.3051365-1-maobibo@loongson.cn> To: Bibo Mao X-Mailer: Apple Mail (2.3693.60.0.1.1) X-Rspamd-Queue-Id: 254E6A0002 X-Stat-Signature: 7rnxcmxc9fyx6pen88nron768617neht X-Rspam-User: Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=e5J+6qO9; spf=pass (imf25.hostedemail.com: domain of nadav.amit@gmail.com designates 209.85.210.169 as permitted sender) smtp.mailfrom=nadav.amit@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam07 X-HE-Tag: 1646799244-692839 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Mar 8, 2022, at 6:57 PM, Bibo Mao wrote: >=20 > numa worker will periodically change vma prot with PROT_NONE, by > default it will scan 256M vma memory size with pmd stepping size. > If there are fewer pages changed with PROT_NONE, tlb flush is called > with pmd size. This patch will calculate flush range for those > pages with pte prot changed, it will reduce size for tlb flush. >=20 > Signed-off-by: Bibo Mao Hi Bibo, I finally managed to make v3 of a patchiest, which I think does something similar to what you are looking for (without introducing yet another TLB batching mechanism). Have a look at [1] and let me know if that would satisfy you. [1] = https://lore.kernel.org/linux-mm/20220309041043.302261-4-namit@vmware.com/= T/#u