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Thu, 29 Jan 2026 08:21:00 +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 BxCwGWwYe2mbWgAAD6G6ig (envelope-from ); Thu, 29 Jan 2026 08:21:00 +0000 Message-ID: <2cd89ed5-0c8e-43f8-896d-1b7dee047fef@suse.cz> Date: Thu, 29 Jan 2026 09:21:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 06/22] slab: add sheaves to most caches Content-Language: en-US To: Zhao Liu Cc: Harry Yoo , Petr Tesarik , Christoph Lameter , David Rientjes , Roman Gushchin , Hao Li , Andrew Morton , Uladzislau Rezki , "Liam R. Howlett" , Suren Baghdasaryan , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com References: <20260123-sheaves-for-all-v4-0-041323d506f7@suse.cz> <20260123-sheaves-for-all-v4-6-041323d506f7@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: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: 652BE4000A X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: habaki88mcba357sr39cy1n7urypx6ws X-HE-Tag: 1769674862-372742 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 1/29/26 08:24, Zhao Liu wrote: > On Fri, Jan 23, 2026 at 07:52:44AM +0100, Vlastimil Babka wrote: >> Date: Fri, 23 Jan 2026 07:52:44 +0100 >> From: Vlastimil Babka >> Subject: [PATCH v4 06/22] slab: add sheaves to most caches >> X-Mailer: b4 0.14.3 >> >> In the first step to replace cpu (partial) slabs with sheaves, enable >> sheaves for almost all caches. Treat args->sheaf_capacity as a minimum, >> and calculate sheaf capacity with a formula that roughly follows the >> formula for number of objects in cpu partial slabs in set_cpu_partial(). >> >> This should achieve roughly similar contention on the barn spin lock as >> there's currently for node list_lock without sheaves, to make >> benchmarking results comparable. It can be further tuned later. >> >> Don't enable sheaves for bootstrap caches as that wouldn't work. In >> order to recognize them by SLAB_NO_OBJ_EXT, make sure the flag exists >> even for !CONFIG_SLAB_OBJ_EXT. >> >> This limitation will be lifted for kmalloc caches after the necessary >> bootstrapping changes. >> >> Also do not enable sheaves for SLAB_NOLEAKTRACE caches to avoid >> recursion with kmemleak tracking (thanks to Breno Leitao). >> >> Reviewed-by: Suren Baghdasaryan >> Reviewed-by: Harry Yoo >> Signed-off-by: Vlastimil Babka >> --- >> include/linux/slab.h | 6 ------ >> mm/slub.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++---- >> 2 files changed, 52 insertions(+), 10 deletions(-) > > vm_area_cachep's capacity seems to be adjusted to 60 and > maple_node_cache keeps 32 as the args setting. Good to know. It is a bit larger. Hm I could have probably applied the args capacity before doing the roundup to make sheaf fill whole kmalloc size. Would add a few object for maple node I guess. > I still use will-it-scale to evaluate the impact of this patch, and > performance results appear to be on par with previous ones (*) - doesn't > have regression on my cases. > > Based on the results of previous capacity adjustments testing, I think > it shows that the capacity of the maple_node_cache appears to have the > significant impact. > > There may still be room for optimization in maple_node_cache. As a > general-purpose algorithm at present, I think it has achieved its > intended purpose based on my test results. So, > > Tested-by: Zhao Liu Thanks! > > > (*): The previous ones include 2 cases: > 1) w/o this series, and directly based on the previous commit ("slub: > keep empty main sheaf as spare in __pcs_replace_empty_main()"). > 2) w/o this single patch, and based on the previous patch 5. > > Regards, > Zhao > >