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Wed, 29 Oct 2025 15:37:21 +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 aaF/ErE0AmlyeAAAD6G6ig (envelope-from ); Wed, 29 Oct 2025 15:37:21 +0000 Message-ID: <90f21264-b227-4a83-9944-39d3e0ea40dd@suse.cz> Date: Wed, 29 Oct 2025 16:37:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 03/19] slub: remove CONFIG_SLUB_TINY specific code paths Content-Language: en-US To: Alexei Starovoitov Cc: Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Uladzislau Rezki , "Liam R. Howlett" , Suren Baghdasaryan , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm , LKML , linux-rt-devel@lists.linux.dev, bpf , kasan-dev References: <20251023-sheaves-for-all-v1-0-6ffa2c9941c0@suse.cz> <20251023-sheaves-for-all-v1-3-6ffa2c9941c0@suse.cz> 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: 8bit X-Stat-Signature: znc5bk9mahtjgyirwr8y4af78qw43ttp X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 474F32000D X-HE-Tag: 1761752243-106651 X-HE-Meta: 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 cGgG6pqV Y0bZ6SlRS+jbH9YBDyvF/52FZhr1ce93sGG35LhmgoYpSiwe5F3+duUzfNEyBUHaVPOAjkbUqybwQP2ZWcXtE9YewCFI/XN6gzCITJSTVNoO6oai5TsLzFmBSx+lfC57kqNLAltw3xuSQbM0AL3gYH527xb54jVq8TxCtdsRcJZcXwVXQYofH66IVh4Rkf2xEpAfMGXG0Z37rAO/dXf//1AhDkgqXv/U7liBJPEAs1Zt0+5r8OTC4srmB9lwLQkzWLMTqN/k6O3CcO4KKUzGFW1R2bDumY2HD/6eTDONgyJ1YZoBAJsUBoX2ExMUW05yjBXgCqb8OZjS2nXNT70Mwo1vyFfsS/DNbOKzkBQw06b4v8F8HyYLyZVWlmFeFtWKbmBd6L9gdUtWKAIMlcYt7X9QPXl7NtTu2QL9RGIFF9g7eINs= 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 10/25/25 00:34, Alexei Starovoitov wrote: > On Thu, Oct 23, 2025 at 6:53 AM Vlastimil Babka wrote: >> >> CONFIG_SLUB_TINY minimizes the SLUB's memory overhead in multiple ways, >> mainly by avoiding percpu caching of slabs and objects. It also reduces >> code size by replacing some code paths with simplified ones through >> ifdefs, but the benefits of that are smaller and would complicate the >> upcoming changes. >> >> Thus remove these code paths and associated ifdefs and simplify the code >> base. >> >> Signed-off-by: Vlastimil Babka >> --- >> mm/slab.h | 2 -- >> mm/slub.c | 107 +++----------------------------------------------------------- >> 2 files changed, 4 insertions(+), 105 deletions(-) > > Looks like it is removing most of it. The special code, yes. But the savings from avoiding percpu caching are the most important anyway and they stay. > Just remove the whole thing. Do people care about keeping SLUB_TINY? They did when SLOB was being removed. We can always remove it completely later, but this code cleanup is enough for me not to complicate the further changes, so I wouldn't want to put the complete removal in this series.