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Wed, 12 Nov 2025 15:57:43 +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 WgcaJXeuFGmmDQAAD6G6ig (envelope-from ); Wed, 12 Nov 2025 15:57:43 +0000 Message-ID: <454da918-bb53-410e-8046-49ffded8e5df@suse.cz> Date: Wed, 12 Nov 2025 16:57:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: mempool_alloc_bulk and various mempool improvements Content-Language: en-US To: Christoph Hellwig Cc: Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Eric Biggers , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20251111135300.752962-1-hch@lst.de> <48e45106-f76a-421d-8f9c-645469076ad4@suse.cz> <20251112155011.GC7209@lst.de> 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: <20251112155011.GC7209@lst.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: 4768A40011 X-Stat-Signature: ho1niwb9tft6fmpgy79hdhi3z9t5xjwk X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762963065-118784 X-HE-Meta: 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 5cU11fw5 nb0ukD/mZGFsAC/d9Q4h/BSg7JiS0uP+e4DuUk5zdinE+RFf7QgYAnvZeJlcYp0nXjxj+IADnUe8bLUknfvBRaAVQ/sYQE/TerIKaXz3fGzj9Vui7gQINRPUV44xPzv4LPyP/J8HANwbNI5n1WNe37Mcfo+5DJABdIi8X0R3RTtXU5zUPGBGFatS7JghCiVljX+2DfJu/pBqZUHVSwEjzJr3+My5n+ohNPYFBP2rPGGVqNBL31g2zEaY0o5P7aWUXXTdWuSXGzRV2IqM+9LCS+mTJCrazOckCfwV8f1M4lHC+HO3zk2bceLFmlD0FB3LWG7Qkxt5813SjQln8Gjs84V8MQxNKE8JWAJE9 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 11/12/25 16:50, Christoph Hellwig wrote: > On Wed, Nov 12, 2025 at 01:22:01PM +0100, Vlastimil Babka wrote: >> On 11/11/25 14:52, Christoph Hellwig wrote: >> > Hi all, >> > >> > this series adds a bulk version of mempool_alloc that makes allocating >> > multiple objects deadlock safe. >> > >> > The initial users is the blk-crypto-fallback code: >> > >> > https://lore.kernel.org/linux-block/20251031093517.1603379-1-hch@lst.de/ >> > >> > with which v1 was posted, but I also have a few other users in mind. >> >> How do we handle this then once it's settled? > > Good question. I think there is enough mm material now for a merge > through an mm tree. If we get it sorted out for this merge window just > merging it through mm even when there is no user yet would be easiest as OK should work hopefully... > the blk-crypto work is probably not going to make this merge window with > additional review from Eric and I'll most like have another user for the > next merge window as well (block bounce buffering for !STABLE_WRITES > dio). Otherwise we'll have to operate with shared branches. ... and we can avoid the need for shared branches that way.