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Thu, 29 May 2025 13:59:29 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id gLI+JEFoOGhFPgAAD6G6ig (envelope-from ); Thu, 29 May 2025 13:59:29 +0000 Message-ID: <4bead2e4-a00e-447d-a117-934190858673@suse.cz> Date: Thu, 29 May 2025 15:59:29 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/4] mm: ksm: have KSM VMA checks not require a VMA pointer Content-Language: en-US To: Lorenzo Stoakes , Andrew Morton Cc: Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Jann Horn , Pedro Falcato , David Hildenbrand , Xu Xin , Chengming Zhou , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Stefan Roesch References: From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 9BA5FA001B X-Stat-Signature: 6mjyh9w7tu1ui5wud5odwsq8rmgggqgc X-Rspam-User: X-HE-Tag: 1748527171-673930 X-HE-Meta: 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 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 5/21/25 20:20, Lorenzo Stoakes wrote: > In subsequent commits we are going to determine KSM eligibility prior to a > VMA being constructed, at which point we will of course not yet have access > to a VMA pointer. > > It is trivial to boil down the check logic to be parameterised on > mm_struct, file and VMA flags, so do so. > > As a part of this change, additionally expose and use file_is_dax() to > determine whether a file is being mapped under a DAX inode. > > Signed-off-by: Lorenzo Stoakes > Acked-by: David Hildenbrand > Reviewed-by: Chengming Zhou Reviewed-by: Vlastimil Babka