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 12C49D6EC05 for ; Fri, 29 Nov 2024 12:45:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 868586B0083; Fri, 29 Nov 2024 07:45:50 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7F0566B0085; Fri, 29 Nov 2024 07:45:50 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 61B406B0088; Fri, 29 Nov 2024 07:45:50 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 3C48A6B0083 for ; Fri, 29 Nov 2024 07:45:50 -0500 (EST) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id E63CAA0330 for ; Fri, 29 Nov 2024 12:45:49 +0000 (UTC) X-FDA: 82839104250.15.D33B936 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf01.hostedemail.com (Postfix) with ESMTP id 299CC4000C for ; Fri, 29 Nov 2024 12:45:40 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=BgOVjQoK; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf01.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1732884343; a=rsa-sha256; cv=none; b=HYM7KyCmU8XyBFGArxz/i6LMiVRre/UeBUvpqYvKMayZFTBay5cHteUIq9jsbcsMNmU+Qr 6PbgFCjU5WgOM2axNh42CpMmSB62tyHYHh05q7u3dxjGhHD7z9PecqRzHmZtXU8djvwaUL 72ACyQG+Y7ZKZTEZZUMSKe5jfagcCi0= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=BgOVjQoK; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf01.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1732884343; 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=rTqikPE9quEJAwZiJ8tB25L8aNEPncKZ/0BfRuOUOKI=; b=0d0Ef2QcHxsdJ1fJVY1H4k5BNN+JA4dYRh6nkuHPVAAbA63fZVu07M2wZ+RyKw+VfA7PPl NMDVJSnTc4S34weHlHrr7ZzZBcgTdDqO12eVvogA3c7vL6WDPnKfxyUq3cjOF6QppmPqpD kKQB9+0az9wmEGx2rXQk650JH+G0RWM= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732884346; h=from:from: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:autocrypt:autocrypt; bh=rTqikPE9quEJAwZiJ8tB25L8aNEPncKZ/0BfRuOUOKI=; b=BgOVjQoKeaU+aZ4FbvxnMq4lfU/aWE68ZX+CJI3weHy9fGDQ6cy+eN5iLQ2X+ZBr6bht5P pkDRQBQyvyGrcgy0Bcdknh6UPDaTN7RxNAeqIVb2VDu3WAf3YA8ESJezCGfwQy8+PBzgSI 6vmO/UeeMZRsIcunaElauNGLbXi6rKY= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-499-mcnSrcrJPkaAlnEBfzVUIg-1; Fri, 29 Nov 2024 07:45:45 -0500 X-MC-Unique: mcnSrcrJPkaAlnEBfzVUIg-1 X-Mimecast-MFC-AGG-ID: mcnSrcrJPkaAlnEBfzVUIg Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-43499388faaso13802725e9.3 for ; Fri, 29 Nov 2024 04:45:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732884344; x=1733489144; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=rTqikPE9quEJAwZiJ8tB25L8aNEPncKZ/0BfRuOUOKI=; b=qNH43Q0ptACR1/ggZnQBH51+G5pCfKEOTXqGe7+DvSJIxuls97UYO01+wKElpLchmq C8bnDfdHHoxZc/rzTZnhH3lpdZ3NJDdtKFAMSCUel1D9w3MhulAjy/QRfqEC+kFYz9z6 S7CkD50BuSJeHHcQfa/swnHMlNUz9hQkG7qVIiPpZCKLKnQei8F1L6q438tRFD2BTYKF 5YtHKaKpoWzyYj5LKkX5tm+pyme0yysRJn2v4OzVaflWAQggb3k7RmOdrMCG/uEPvD4W AcS37bN1V0+Te18WUySSVmwLFaf6kFoEDARGemzLrFhcUsfSL2vYRqZ0T51p7DahCsGk 57ag== X-Forwarded-Encrypted: i=1; AJvYcCW/uaed37cq9zS3CZ/vNEDhhXp9dr8VTGTww2DOZ06ifU0Hq6Qj6jgOHz6qDLQozk2vRymt9WHuHQ==@kvack.org X-Gm-Message-State: AOJu0YyI6eu38MWCbN9ikliGD7brsFYCX3PUZRH6JgB2VmxS2szLcLPM yJ0vt8jccfRLJg1gnwTNuH6r9cL/kGWwLPQug/suq4deaf37VXjQUeAkaVTPPVPy1sdN6ih54qi PUh6zPwxnMOdZyGxzkppU0AhmyLAHuJ9mjKZbcJ2Z1j0fPqVL X-Gm-Gg: ASbGncvHEMek8kTd7ZdN7WFF81j3U6KZGmDi5wbivTdgRJN9LHV3wxMoScAb0MFyZSx 5TTEwU9ciHKfkJ8QsGD8sXMpj9Kn+1DhR/aTBLvH/5+QgjcW/Q8Kguj2jC/PdEm5CuUJpQrFZW7 EAczwKRFyIitPXrqN064OccIJZrCH2OwtJm4AokJpreDaSeIPyT9Mo3bBCobp6sGNkmUiNad8S5 Ec/02KVrK/IjNo/dFrG2E72qjQWstTmemAPzJhof/1Gl7795oTW30pbCRSzjvf/+Mh1WZO7nJ8g C/3rZFzr5wZlAShDMYrkTV1XUHq5tsPzz49mIK8MPuyy+fiDTRGjf4iHZ4JVrB4XIKG0rrn7WBg jqQ== X-Received: by 2002:a05:600c:314a:b0:434:a902:415b with SMTP id 5b1f17b1804b1-434a9dc3c69mr125231755e9.10.1732884344209; Fri, 29 Nov 2024 04:45:44 -0800 (PST) X-Google-Smtp-Source: AGHT+IEfIVICx4newpAkOgyg2u/7j0dqWcM8Au2pFLmwQ9c2FMN+rayeZo5LhCEc7d9ZMyfJhPy3rg== X-Received: by 2002:a05:600c:314a:b0:434:a902:415b with SMTP id 5b1f17b1804b1-434a9dc3c69mr125231405e9.10.1732884343888; Fri, 29 Nov 2024 04:45:43 -0800 (PST) Received: from ?IPV6:2003:cb:c71c:a700:bba7:849a:ecf1:5404? (p200300cbc71ca700bba7849aecf15404.dip0.t-ipconnect.de. [2003:cb:c71c:a700:bba7:849a:ecf1:5404]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434aa763a59sm83405695e9.11.2024.11.29.04.45.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Nov 2024 04:45:43 -0800 (PST) Message-ID: <74be541b-22ad-42b5-b3c5-79b201e28f04@redhat.com> Date: Fri, 29 Nov 2024 13:45:42 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf: map pages in advance To: Peter Zijlstra Cc: Lorenzo Stoakes , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox References: <20241128113714.492474-1-lorenzo.stoakes@oracle.com> <9f9fd840-6421-43b5-9a12-edfa96e067cc@redhat.com> <1af66528-0551-4735-87f3-d5feadadf33a@lucifer.local> <926b3829-784f-47b8-9903-ea7b9ad484ac@redhat.com> <31e8202d-f3db-4dcd-a988-2f531b14e40f@lucifer.local> <84fed269-3f82-47f7-89cb-671fcee5a23a@redhat.com> <20241129122624.GH24400@noisy.programming.kicks-ass.net> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20241129122624.GH24400@noisy.programming.kicks-ass.net> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Y43Lc_qv_hhiC8XpEwAEVkjWvRSZM9bYtcdlisYDALw_1732884344 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 299CC4000C X-Stat-Signature: dprs4umyxk6q5huen5wdj9bc7getbksn X-HE-Tag: 1732884340-677826 X-HE-Meta: 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 TtJiaYSD /6lXL6EbDvAEhyJbUHI67Nohfcyo07l97MaL3Mu6gDzcTerhlb+gvNmq6nJoxijnO3s7Kfn/s6mS0/DW7MMyvtLaX+WFVaIOWbXxxeVUg/drORTeTFD7V5q+MKh/+XoX6I6JCFjGzVUBEgF9TYaHObJhLarN2V5yW/O5IU7jqM7/A4f5N/syXf+GumjJqXNZ7RhBiGL9Xk6BUDKt4H8jOW/r2eswoRCXqqvEIOH+WrVpq9fNoUgpY+iPmnvZRr/zbJRB5Y+n2wZA3nQqBQbB5LAE4tGaAU2P7kV2MdwgJE5iK8E9ziBiH4/dJN+XgXnnAS8LrVgdatIgO3brsyppJORGOumonm8IztylTlUR3XkxgEfNZAxLuO8i6pPiB5SGP6QLxDO3W9Soae2Q= 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: List-Subscribe: List-Unsubscribe: On 29.11.24 13:26, Peter Zijlstra wrote: > On Fri, Nov 29, 2024 at 01:12:57PM +0100, David Hildenbrand wrote: > >> Well, I think we simply will want vm_insert_pages_prot() that stops treating >> these things like folios :) . *likely* we'd want a distinct memdesc/type. >> >> We could start that work right now by making some user (iouring, >> ring_buffer) set a new page->_type, and checking that in >> vm_insert_pages_prot() + vm_normal_page(). If set, don't touch the refcount >> and the mapcount. >> >> Because then, we can just make all the relevant drivers set the type, refuse >> in vm_insert_pages_prot() anything that doesn't have the type set, and >> refuse in vm_normal_page() any pages with this memdesc. >> >> Maybe we'd have to teach CoW to copy from such pages, maybe not. GUP of >> these things will stop working, I hope that is not a problem. > > Well... perf-tool likes to call write() upon these pages in order to > write out the data from the mmap() into a file. I think a PFNMAP as used in this patch here will already stop making that work .... -- Cheers, David / dhildenb