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Mon, 29 Sep 2025 07:14:11 +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 oteeDMMx2migFwAAD6G6ig (envelope-from ); Mon, 29 Sep 2025 07:14:11 +0000 Message-ID: Date: Mon, 29 Sep 2025 09:14:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] rust: slab: add basic slab module Content-Language: en-US To: Danilo Krummrich , Elijah Wright Cc: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Lorenzo Stoakes , "Liam R. Howlett" , Uladzislau Rezki , linux-mm@kvack.org References: <20250924193643.4001-1-git@elijahs.space> 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-Server: rspam11 X-Rspamd-Queue-Id: 91536140005 X-Stat-Signature: d67ux1eyjm5yj7ehsna9omk5r1ppnhsb X-Rspam-User: X-HE-Tag: 1759130054-392926 X-HE-Meta: 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 F1821Se6 OjmWMKrWRULbykCuW239KNURBQFfUWyD5/chxEjfqGr8K8bccsoMUFQYRPITC2e2P5XChDdimnO+9GsRlmySntHPZE4OGav4RFffEzYmuYzEkTAuofvWN9Z12GlgR/cbZx7cRDgCcHHTJMnki45jsTkKRrAkRX0AP/AyYGlMshnDcUl969TU13Vg5/ZboLDZi4RlSa61MB8vjkXQTKXOz5PXPBp3s5B+l+87vV9CL3IoAjcsjgziBPYhZSJwBEE/6+8mJ42WJQFJudZimUTO2ntSbViXSgxP3LaENkVNmBNaJzNJ0iBG4S5bvAw++wlQnjNc+8p8z+hkPuxgvThrSh4aZZCq861Ts+0G/kquxk52q1vM= 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 9/28/25 16:47, Danilo Krummrich wrote: > On Thu Sep 25, 2025 at 11:54 AM CEST, Danilo Krummrich wrote: >> (3) Implement a macro to generate a custom KmemCache Allocator trait >> implementation for every KmemCache instance with a static lifetime. > > Thinking about it a bit more, I think we should go with option (3) for now. > > With its only limitation being that it always binds the lifetime of a kmemcache > to the module lifetime, it still seems to be the best option, considering that > the alternatives require additional synchronization in hot paths, may *silently* > leak the kmemcache, cause significant code duplication or break dynamic > dispatch. > > Tieing the kmemcache to the module lifetime should cover the vast majority of > use-cases; should we ever really need something else we can still revisit the > options. Sounds good. > Thanks, > Danilo