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[2003:cb:c71b:7e00:9339:4017:7111:82d0]) by smtp.gmail.com with ESMTPSA id fa23-20020a05600c519700b004147ec48845sm449220wmb.26.2024.03.22.08.09.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 Mar 2024 08:09:31 -0700 (PDT) Message-ID: <9bd39ce5-a273-4afb-92a8-4259fb7b4b0f@redhat.com> Date: Fri, 22 Mar 2024 16:09:29 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 7/9] mm: Free up PG_slab To: "Matthew Wilcox (Oracle)" , Andrew Morton Cc: linux-mm@kvack.org, Vlastimil Babka , Miaohe Lin , Muchun Song , Oscar Salvador References: <20240321142448.1645400-1-willy@infradead.org> <20240321142448.1645400-8-willy@infradead.org> 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: <20240321142448.1645400-8-willy@infradead.org> 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: A3F75A000D X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: w1ymqyak4rjmo8eppoqmbo6anjnp9zgm X-HE-Tag: 1711120176-139270 X-HE-Meta: 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 iCAwmhUm RUgU8MsdHCzZO7Ku6aMXHItqlChPjcyswvw5F9E8VgAuN94ggqBGT5M/0lm+Wtny9IFGR//UvEVoYsAkZ8QQkpHcJgnee8eS0Y2RojNG15EPhnEbsLfFAkwB15bJqCChSIVpuq+py3oJjTYAudI/Wqq5ZsVrswPzUSLS9dB27fXtntrMHitD0qF8GENbTirEwgJvPjQp0Oous2qV/2yI8D7dl3OyL+eb1rYFepnG0xSbBd/Otm6PVL2bpXA/6NOF4Ke8hEop/2RHUXpZsTkZnzMJllizSinKxDRRAMlOO3gTrP24imbkbeI2rjFQzjt27HRkf0X63Sk98g2to79QRTbz7rwnuna1wGbkdPssRRSSFUGPIwDpEhHmhbWfczRrD8VauJwkgzGdyr99lwT2lfmPvbHG/Bx5Ne+q3qL61QGqjNMDBRCELNyIlytaBRduO2b8E8008TWTpPg4PAF/OMp8X7bfS4vXBsIl8lbKParM4khvUQSd1CAc87tglb9MEzdSb0Pm1/d4rx1udXRp7blWi0pREzTuOpsZLxThBsICzlzw= 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 21.03.24 15:24, Matthew Wilcox (Oracle) wrote: > Reclaim the Slab page flag by using a spare bit in PageType. We are > perennially short of page flags for various purposes, and now that > the original SLAB allocator has been retired, SLUB does not use the > mapcount/page_type field. This lets us remove a number of special cases > for ignoring mapcount on Slab pages. > > Signed-off-by: Matthew Wilcox (Oracle) > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb