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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1C9D1CD98CE for ; Thu, 11 Jun 2026 14:58:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4B0116B0005; Thu, 11 Jun 2026 10:58:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 461096B0088; Thu, 11 Jun 2026 10:58:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 34FAE6B008C; Thu, 11 Jun 2026 10:58:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 25B996B0005 for ; Thu, 11 Jun 2026 10:58:00 -0400 (EDT) Received: from smtpin23.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 9C1561206E0 for ; Thu, 11 Jun 2026 14:57:59 +0000 (UTC) X-FDA: 84867936678.23.3F59F90 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf07.hostedemail.com (Postfix) with ESMTP id D47D74000F for ; Thu, 11 Jun 2026 14:57:57 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=O++plUEx; spf=pass (imf07.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1781189877; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=wz9ItHliZGhJvKRUZ4gAmxcUKtvEMcuTAQo5bvyQH6c=; b=ZeaduaJ+8Vl1Wkxnbfu4R8iAT8vuEgopLOUbMAA2RjXKGV3aOfCF0UpwSrXV4HOBHo48NW s5Nj2oPjapos9bJ/tNxHaiL74mrVgQuDy34DTYAWhoJYVT3laRITPp5TC0jhCG+f1+lro1 yzTF3A1H2Hf5VJOKySJ9pq93zTocKqE= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1781189877; b=cnSls3wUtW3tXTxLcqFbcnwoY6QIeP+GwaFGFedqpeGmFcoDh82sQ0G/MR1+ShsJb3FoaB aI+zJzQsCIxHXjIjOIfmZC4L8WYBL0hNgYskAsxtY0rwxIRt97VU0x4LkFyXAPHS82DsZF tZ6jnPbngxzLxJnBKgiP0AWzoElR5iI= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=O++plUEx; spf=pass (imf07.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 50B2D6001A; Thu, 11 Jun 2026 14:57:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 917941F00898; Thu, 11 Jun 2026 14:57:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781189877; bh=wz9ItHliZGhJvKRUZ4gAmxcUKtvEMcuTAQo5bvyQH6c=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=O++plUExQDTLTfRaG6pFrkzLMrG5CRRssZX2tQl6B6x921jcKkinyn1IDVOsRfAQj QgVQl3VkYQPcrJ41mO1WNPBBIqVI2Uq0gbPOxTNEX7pOyA+oVXViqg6e5WSLG6823f uO5BRfQxSurW2O5wpkUzr6dtet5+CPVlQuIXNVf04am5m5zOmzb8+mN3BD/jahIY4P qvpGimdhqXdQyx4MpH7HRc1P24vsudiSx5mUE4B5iNINSTQBwP+CmKKtwQ7N+bsAEV DWLuxm/70VpePzLALuDJEiVtY5Aoh/Ue2eUtB7xUBGe2nb5ZLIlh6peT3mJUx1vS94 HaIZRxumXmcmQ== Message-ID: <266c82ff-8788-49ff-8a14-5ae57b880f80@kernel.org> Date: Thu, 11 Jun 2026 16:57:50 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] mm: drop pte_clear_not_present_full() To: "Oscar Salvador (SUSE)" Cc: "David S. Miller" , Andreas Larsson , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Peter Zijlstra , sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260611-clear_not_present_full_ptes-v1-0-49865fc82629@kernel.org> <20260611-clear_not_present_full_ptes-v1-2-49865fc82629@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: D47D74000F X-Rspam-User: X-Stat-Signature: swuyx4de73mtcm7gqfjwxj1bobyi48px X-Rspamd-Server: rspam08 X-HE-Tag: 1781189877-432589 X-HE-Meta: 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 pH7KRGOT ehlI6yoNqwPDaLiiF5mTiriB/GXF8VYPrJXUCNOFb+kOd3mifCqPhFi9Mgs++SWoKdFVQxe7jnftu87YoE0B2KGcQTGmnAOo+2+K2Vh17azCFDv2IVDcm2nZDgqGiL1ML2R3NLzNaaqla0QAy/BfpOaGfrxgQjNPxNIQviB5O80zolWvwK4jZvYwg73FAo0RXsf5VPdqnXgO/00mVtSfCEZ+sOAuJNXaofg7WXYPXTWM0KY0xLhuIiSXsl/9PK5h2DzmmcnLTaBUHQYPrmpwkglvJ8vc6OtfDurAwH3nyumWK6Y955PlvWQK/6Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/11/26 15:49, Oscar Salvador (SUSE) wrote: > On Thu, Jun 11, 2026 at 01:50:48PM +0200, David Hildenbrand (Arm) wrote: >> In general, there is no good reason to do anything special when clearing >> non-present PTEs. >> >> In theory, HW that does have to invalidate TLBs for non-present PTEs could >> benefit from a "full" parameter, but fortunately > > That would be on arches like arm64 where it can cache non-present > entries, right? arm64 cannot cache them, it may only have them in the CPU pipeline temporarily, and a special barrier (isb) is sufficient. Risc-v has something like that, but they seem to handle it differently. -- Cheers, David