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Tue, 09 Jul 2024 20:05:11 -0700 (PDT) Received: from [172.20.2.228] ([4.28.11.157]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fbb6ac2c94sm22922375ad.215.2024.07.09.20.05.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 09 Jul 2024 20:05:10 -0700 (PDT) Message-ID: Date: Wed, 10 Jul 2024 05:05:06 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v21 1/4] mm: add VM_DROPPABLE for designating always lazily freeable mappings To: "Jason A. Donenfeld" Cc: Linus Torvalds , linux-kernel@vger.kernel.org, patches@lists.linux.dev, tglx@linutronix.de, linux-crypto@vger.kernel.org, linux-api@vger.kernel.org, x86@kernel.org, Greg Kroah-Hartman , Adhemerval Zanella Netto , Carlos O'Donell , Florian Weimer , Arnd Bergmann , Jann Horn , Christian Brauner , David Hildenbrand , linux-mm@kvack.org References: <1583c837-a4d5-4a8a-9c1d-2c64548cd199@redhat.com> <6705c6c8-8b6a-4d03-ae0f-aa83442ec0ab@redhat.com> <7439da2e-4a60-4643-9804-17e99ce6e312@redhat.com> <75d6c45d-deea-464d-b0fd-b36e5d73b898@redhat.com> 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: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4CA62A0011 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: ngeo3w8byh55dh1emqa7uwxk7oe1dhxw X-HE-Tag: 1720580717-255857 X-HE-Meta: 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 qcSFnRql 0tvKJT/CQXEh5iAjI2rNWv5rF9LuL59c1AkvQGFmTifYMpKaNIAAgWzBHa/JUblZw5MwY2Z3h4KDNfodUeeSc+ur2DsSQmkXI9fECZkbV2MOWh98MXnV5mOOFkhXNL81kelPUSgI/OLoawN/2fZrW4PCUxyaNrIH3FUOGuwr/JzKHjCeeQEF/sYtj6SrM7sX2Omka0CiaUapA83IRuDqFpvgKyOK9T6v5+qw689YCD3RJmAhiXLj8qmSgQnhT56cA8jrGfHoQKoPLEq4uixCtvyoNOHZ1qUlj/5ZtQ7SvGvl2PXoYDOss9GY81jJU9a45zHy5sRp5xe53gzxobXXEG7uPJ0VLrvmPJuje8Z15wOqHBaFaE24k7VmbIuinNDtKBcihYk+vBfTjuRxi5QjUcr8c3oRNMme5fwu7ioMxxGneRzN70DUUh/ZG0w== 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 09.07.24 04:17, Jason A. Donenfeld wrote: > Hi David, > > On Mon, Jul 08, 2024 at 10:21:09PM +0200, David Hildenbrand wrote: >> BTW, I was just trying to understand how MADV_FREE + MAP_DROPPABLE would >> behave without any swap space around. >> >> Did you experiment with that? > > You mean on a system without any swap configured? That's actually my > primary test environment for this. It behaves as expected: when ram > fills up and the scanner is trying to reclaim what it can, > folio_test_swapbacked(folio) is false, and the memory gets freed. After, > reads fault in a zero page. So it's working as expected. Okay, just to be clear: no swap/zram/zswap. The reclaim code regarding not scanning anonymous memory without swap was a bit confusing. thanks! -- Cheers, David / dhildenb