From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 70EEAD44C59 for ; Thu, 15 Jan 2026 15:12:13 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B82546B0088; Thu, 15 Jan 2026 10:12:12 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B2F906B0089; Thu, 15 Jan 2026 10:12:12 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A10F66B008A; Thu, 15 Jan 2026 10:12:12 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 8D6C36B0088 for ; Thu, 15 Jan 2026 10:12:12 -0500 (EST) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 4777DB8FA2 for ; Thu, 15 Jan 2026 15:12:12 +0000 (UTC) X-FDA: 84334538904.27.75B9731 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) by imf13.hostedemail.com (Postfix) with ESMTP id B337C20005 for ; Thu, 15 Jan 2026 15:12:09 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=Oe+Td0k4; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Mx9dEdlM; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=Oe+Td0k4; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Mx9dEdlM; spf=pass (imf13.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.130 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1768489930; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=elMJW99Aqg4ZRWyy1Tm+k4UtFI51uPd4F2wPebrnoJE=; b=cralG0PCUQQzoEFR1IaLvwe+KyB6cLgpcmYru6HMmvFXSglXaEMFIQUwAZNPupKwgzgaIB Q/riIfVmcYyBirfiKAzP5s0jph0kEGgcHApFmcJmxGq34p0Tn7zYnyHQTkWmcIkRdy1+QV r0XKeT97yPelyUNuvxGAx1cDK8RZlQk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1768489930; a=rsa-sha256; cv=none; b=AafNIZw/JX+yS5J2q68JD0b0k0PDsP+Q6ayUh9cL7VdeSSiA0dXLpr6RMkk9uDNNkDhdub WwnL42XshuQI6tAEH9dIdnsqXynyFXshIUsn4lGhPu9LLEC0ArYfS6FaeBZAfhxAjVdTd7 aBWTOv2RIjt/mDuUp63U4fcnvRo34Kw= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=Oe+Td0k4; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Mx9dEdlM; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=Oe+Td0k4; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Mx9dEdlM; spf=pass (imf13.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.130 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 180513378D; Thu, 15 Jan 2026 15:12:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1768489928; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=elMJW99Aqg4ZRWyy1Tm+k4UtFI51uPd4F2wPebrnoJE=; b=Oe+Td0k4siueCAsRxJcSWG13AYEwgZmBt4MjPLn/ErgQduOdNQaNeDReMgziQyt9VPjEBQ /e/rmeGCyEW+3bRMbDEKEWZqWgu549BUF3/Dxrj/sgu6iNi0ccSK/ehNgwnx/IhVI2AkMV taFoo144FRRkvT5LEj852ZaeOToQ9WY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1768489928; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=elMJW99Aqg4ZRWyy1Tm+k4UtFI51uPd4F2wPebrnoJE=; b=Mx9dEdlMxlDTajoEmQddG6KEWY6qemdZVY7P0pu/xijFOWgmODVF1WXJnAb8iqS0NMCjyM kPh59yqkbDtbNoCg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1768489928; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=elMJW99Aqg4ZRWyy1Tm+k4UtFI51uPd4F2wPebrnoJE=; b=Oe+Td0k4siueCAsRxJcSWG13AYEwgZmBt4MjPLn/ErgQduOdNQaNeDReMgziQyt9VPjEBQ /e/rmeGCyEW+3bRMbDEKEWZqWgu549BUF3/Dxrj/sgu6iNi0ccSK/ehNgwnx/IhVI2AkMV taFoo144FRRkvT5LEj852ZaeOToQ9WY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1768489928; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=elMJW99Aqg4ZRWyy1Tm+k4UtFI51uPd4F2wPebrnoJE=; b=Mx9dEdlMxlDTajoEmQddG6KEWY6qemdZVY7P0pu/xijFOWgmODVF1WXJnAb8iqS0NMCjyM kPh59yqkbDtbNoCg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id E790C3EA63; Thu, 15 Jan 2026 15:12:07 +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 vcoBOMcDaWlcEgAAD6G6ig (envelope-from ); Thu, 15 Jan 2026 15:12:07 +0000 Message-ID: <8c508b65-3b80-4b91-afa0-145b44686b6a@suse.cz> Date: Thu, 15 Jan 2026 16:12:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 00/20] slab: replace cpu (partial) slabs with sheaves Content-Language: en-US To: Harry Yoo , Petr Tesarik , Christoph Lameter , David Rientjes , Roman Gushchin Cc: 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, kernel test robot , stable@vger.kernel.org References: <20260112-sheaves-for-all-v2-0-98225cfb50cf@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: <20260112-sheaves-for-all-v2-0-98225cfb50cf@suse.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: B337C20005 X-Rspam-User: X-Stat-Signature: hf7uo866kxbpcnagy3rj37s77buuwy8m X-HE-Tag: 1768489929-381124 X-HE-Meta: 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 WDseartZ mc+BzbLc02UgXa/QZv0I6Big0oL0RcbRiAupSz0uzpG82eHagoeCvbbVDoG69J/Gzje04kead0ktP39lC4fk/aeToI8kqINAqjUqidaFPN+EqH3s+TU9oeo9MlFJ5Veswy3mcA3KVHAk/TCnDO6M4QQ7qj0eoZLQYmJTb5jk47ZdtSWGoGERxYnnDcn7JP1QbxoN2KbAW+61XC738Gx7HJCExgrZb1HiJpArjT6F3C+b9dvzqY1aRmTgwX+yeu+8gNOAHLVlN2TzC1feCd5un+pwI+BrFLjT9WX+YjlEqFzaXnZ/r/6AYkggNww== 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 1/12/26 16:16, Vlastimil Babka wrote: > Percpu sheaves caching was introduced as opt-in but the goal was to > eventually move all caches to them. This is the next step, enabling > sheaves for all caches (except the two bootstrap ones) and then removing > the per cpu (partial) slabs and lots of associated code. > > Besides (hopefully) improved performance, this removes the rather > complicated code related to the lockless fastpaths (using > this_cpu_try_cmpxchg128/64) and its complications with PREEMPT_RT or > kmalloc_nolock(). > > The lockless slab freelist+counters update operation using > try_cmpxchg128/64 remains and is crucial for freeing remote NUMA objects > without repeating the "alien" array flushing of SLUB, and to allow > flushing objects from sheaves to slabs mostly without the node > list_lock. > > This v2 is the first non-RFC. I would consider exposing the series to > linux-next at this point. > > Git branch for the v2: > https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=sheaves-for-all-v2 The current state with collected fixes: https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=b4/sheaves-for-all