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Thu, 11 Jul 2024 11:24:10 -0700 (PDT) Received: from [10.35.209.243] ([208.115.86.68]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-70b439b70b4sm6003781b3a.185.2024.07.11.11.24.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Jul 2024 11:24:09 -0700 (PDT) Message-ID: <8586b19c-2e14-4164-888f-8c3b86f3f963@redhat.com> Date: Thu, 11 Jul 2024 20:24:07 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v22 1/4] mm: add MAP_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: <98798483-dfcd-451e-94bb-57d830bf68d8@redhat.com> <54b6de32-f127-4928-9f4a-acb8653e5c81@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: DC5C0C0018 X-Stat-Signature: 8gef9yt94y8yxyr1cg7o16jwhjyd1q9k X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1720722253-134833 X-HE-Meta: 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 jJsItvDL cSyeyCaqRewWsxPSOirrwoc64jDpShA4WI3H2buqDtmF+yK35keZYQ2ixsC3yq6exsIUPPXAcGVeoF1/W7BAkf08iqw63jNdASmJOx2uBG21Vr0t9uGnGCEuww22yCoWfP67WKUz//FMakxQ6JMCaKiYwOu72uRfbBYfQqL2DScLmCqpwKtvO289sUXObQScgqCBfNs1eWZo29hUyTEirc5Ks0wU5SwKFe3OR9r0E3B059/fzl/HJ+9FlYDTQg57KPbF7XQNts3zmMw4UV3+IV5bLDAXbuqhzjqtb26F8qQ7b/Isa/lUcjwXl8LyNnkxoi43zyV+07TlutL2lLCoj6NtcO+VG3rcy46HxKEmFXQ3YY4Z0YcxZdYRr+M66b66lBeNkJ+WrmQpwQKAz+kNAy8ZaTam3N4Bao8cwSnsrKxyvnDrJxKPdDLP1dQ== 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 11.07.24 20:08, Jason A. Donenfeld wrote: > On Thu, Jul 11, 2024 at 07:56:39PM +0200, Jason A. Donenfeld wrote: >> On Thu, Jul 11, 2024 at 07:54:34PM +0200, Jason A. Donenfeld wrote: >>> On Thu, Jul 11, 2024 at 07:27:27PM +0200, David Hildenbrand wrote: >>>>> PG_owner_priv_1 maps to PG_swapcache? :) >>>> >>>> Maybe the combination !swapbacked && swapcache could be used to indicate >>>> such folios. (we will never set swapbacked) >>>> >>>> But likely we have to be a bit careful here. We don't want >>>> folio_test_swapcache() to return for folios that ... are not in the >>>> swapcache. >>> >>> I was thinking that too, but I'm afraid it's going to be another >>> whack-a-mole nightmare. Even for things like task_mmu in procfs that >>> show stats, that's going to be wonky. >>> >>> Any other flags we can overload that aren't going to be already used in >>> our case? >> >> PG_error / folio_set_error seems unused in the non-IO case. > Note that Willy is about to remove PG_error IIRC. > And PG_large_rmappable seems to only be used for hugetlb branches. It should be set for THP/large folios. -- Cheers, David / dhildenb