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imf29.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="IN1C/6TA"; spf=pass (imf29.hostedemail.com: domain of vbabka@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=vbabka@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1785260812; b=K7B27kGpuYxCo8jG2E75LIlypMLtmlcQKyWlFL23YOcSgJ/oZXD3z0u72Pdrt/TAG2FKBl OCZn2RqoQaRfdwwhosq9vhOFJSaBTynPgy2YEUpXQ+iSXgWCzXXgJtI6P+AYcJJtxNLxHy S/m50tlWAxcyD/Q75lbSix+qDwps8Rk= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id F0965600FC; Tue, 28 Jul 2026 17:46:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 37DE41F000E9; Tue, 28 Jul 2026 17:46:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785260811; bh=oGzCyBQVNAADahTS9j+taObDqgyrjdBmVF7/If3BszA=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=IN1C/6TABX8DJkmlH/pqQ3Gh9ymlJQAXHBqgl37UZuJxbsCwEPm0kfmtHidqBmwEl jWh7R+7qKBg/lB0fJrNNBM6NJIjRIdhVVlRUiIQGwWp6v+WR7PtBLQItV1bt+bW9z/ dclDTxcN0nwp0N6cZuSALlo7luayIE3YE6m3x/ki2+lbsqSuoDBO356VcmVh67fnkR kkRbMdsnba+Vl7LPK5jOFZq+6iFRSHQR28znFUBw/PBuZJm1tEQWUNNvi/OulePmB0 F8cWOEfewGKnP3E4anDlgWZQmbfa7Acp3+3cvp3JvQgiyHjev7Dy9XQ23UhEV2CkU/ 9eX7q8Ad/mkng== Message-ID: <53f59eaa-efd8-491c-ae12-510e2b675533@kernel.org> Date: Tue, 28 Jul 2026 19:46:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 00/13] mm/slab, alloc_tag: reduce obj_ext memory waste Content-Language: en-US To: Harry Yoo , Suren Baghdasaryan Cc: Hao Li , Shakeel Butt , Alexander Potapenko , Marco Elver , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org References: <20260727-b4-objext_split-v3-0-c29ef0f1f257@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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 BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSNWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBrZXJuZWwub3JnPsLBsAQTAQoAWhYhBKlA1DSZLC6OmRA9UCJPp+fM gqZkBQJqFFy6GxSAAAAAAAQADm1hbnUyLDIuNSsxLjEyLDIsMgIbAwUJGtCBUAULCQgHAwUV CgkICwUWAgMBAAIeBQIXgAAKCRAiT6fnzIKmZJIUEADFx/tREzUImHrEwVHeSvDFmA7tJysI UVrlvrM09E7GIuzphzv7jYmo8n3ANpCczLEVr4G0syYQdTigaZgv3+FQDIIzhKih1IHhu1Ei XHlywNWKnQxxQEUNi5Mwx43wQz5XVw9F1A7gtKBKNtfogO511hAbrzagrYajyQacEJ/+sfhZ 9Da8ltHIXD8pcYaHUfQgEusCgmEd9+KrUwrTbckFKmYq5chuE6yJ4J0EmWknL096jIE6CnzF FRslQ3B1UKDjxVsm1ZHfir5NeWszLkTvGFsddFaWTgh8UycESG6VQzKXjjewXu2pG7YQYRpj QKm1W5X2TkwWkXRBZTmfmbhxIUMh3+zf5wQ463rSmDN/8v81tdqBtAW6rH/kzg1GvkaTHXn0 507yEHFzBksk2viAuIxxr7km8+/KARYLIdGtx30EG8cKzAUZOK6WqxtNCsXUJNrVE8CWrCaD icoNu7Fs1c5hmPHdSTnU48ce67449DdnO4neLSNhRiGlMHJgfJUmgrxu/hcYeOZ3haWmEQ2w uW1Mh01OHi8QZHCEyAbABrPs9GUgccc/4eYXX9hIgxfSkYzn8f+8NuIFPWl/0uTvjgqU29FQ SbzOLxHq9439Ox40G5mS5eZXRGxITYR+6TXvRGI6P/264jvflnr/pDGUttaikU+0W+1uxgKH cmYbEc7ATQRbGTU1AQgAn0H6UrFiWcovkh6EXVcl+SeqyO6JHOPm+e9Wu0Vw+VIUvXZVUVVQ La1PQDUi6j00ChlcR66g9/V0sPIcSutacPKfdKYOBvzd4rlhL8rfrdEsQw5ApZxrA8kYZVMh FmBRKAa6wos25moTlMKpCWzTH84+WO5+ziCTsTUZASAToz3RdunTD+vQcHj0GqNTPAHK63sf bAB2I0BslZkXkY1RLb/YhuA6E7JyEd2pilZOrIuBGl/5q2qSakgnAVFWFBR/DO27JuAksYnq +aH8vI0xGvwn75KqSk4UzAkDzWSmO4ZHuahKtQgZNsMYV+PGayRBX9b9zbldzopoLBdqHc4n jQARAQABwsF8BBgBCgAmAhsMFiEEqUDUNJksLo6ZED1QIk+n58yCpmQFAmfIHFQFCRYU6J8A CgkQIk+n58yCpmS2PA//bqN1LfcotmArgElsa+0EGZSQlYgK48pm8WAeTXTngudP9IJ4SuKY HR5RNjHcBeqN+Me0zxRqYzRb8nGanHEkDyf4Im8DQM8d6vbyU+FcPmG4skud4kgS1zMHnlVd SXfSIwKC/hKgdHG8aBV7545Lz9X6Iohea+94wneD0aw/hqF+QWewGZhWJriWAZtvEkzNjQOi 4U9F/trLten/x7bpphDSnDMKJtITbtzATT1Dq7o7VpIUK1nCTQALMuMjKCdi8OdU/+V+R3O4 0PXWvX8qrvqYapVbZ+9KqT74FsuB0Ya9uXwgBF2Q6cRuETZk5vqaqKxzqoQZCO8AOz/58j6O 2RHNy/mZEN+7tJ5Tsq42zVJ4jxsT8b9YplavCMsnBgDeRWhcbYhCyttoL7nYISyWg4kQYZ/P wIV3OuNv2f8iKYsxNsRuClOAF82+gvqOy1/1pprFjy8uo2pkoOrb63aOP3vO5VHnRKgra6dq NcaZ+c6J4H+nEJGi2SkHAUJz5oBzuThvPudLvPA/SK8sKoM01IRxSihev/S/5WLazXB1PGem OCbvzC1IjWJJraxiDJ5IygokapUa2RP7+WBR22skQ3SSl6G107QgWKSyTOGWEaRmV53vxQLV jXuCmzSSasTL60zq5yGrT4/DYQVSNEUiUbG4pYekxJujNeEDkUlky0Y= In-Reply-To: <20260727-b4-objext_split-v3-0-c29ef0f1f257@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 72C53120008 X-Stat-Signature: gjhgyn1yo6khh5yrcq6i6w474hktm56w X-HE-Tag: 1785260812-325893 X-HE-Meta: U2FsdGVkX18knkoCoYARISOEDDAXTfj8SL5qY37H1A5S97MaiAcMQHb8J2t3jAGi0pgsyCVoc1YZwMr4RpowlxXbr2Zq8y+gfYDy/ZEa+3tn/lxmNfwcDQmagfUKPZV7Q5+yKPlf1uRLl1/cjiIjwYHstsF7Vitf25sYO7Me/82sxs2NLX0XiLXDmFiwJ1X9FCrLEX2qREZck+/9oSl8jTQ8jv6FV9irsf6dCxJKZ09LUtgeHWlVYuGmU/N2944qZzaO526BhkAn1wrL+C/KjkPHl7fqXCYlc1/4lUphi/UNTC9rsismPENP+sII1SlFeS6DT3vhnK0wJlDurb+sL3A0+ZMezI9TAvfzrwqTUU/B/Of9UPpn+y2/70Ufw1DtcBeVDomNTX4nawZ3B257lhLUJ7j+6eb4YKi3NL3biRiBW8YBdju2BdT77zP1REPVFO0H6npFein4m75v8+c+Jh/xLpU0yPi/y5SItYqrE14zv+yps/INp4xNTVVBGmL79EsvCsTBgratglL6pq4iz9YrDJSws+wO3YbYhfGHRfQXD8AjDf0HG7s8kib8w9JotmtXYclqlqPiVLloZON4HisGtEDMpRJPIGh8gwJy1mserV4uEumQ4z0xi23kK9W1JnVUxeQN31QqIOJFZQ9hl8rGSavtA4SYlEYR8VYgRU0QcZSs5I/aqo0omtIcfmN1Vh8u0fuazm/9e4458CRWzB8lVvocqe9Wqo9bqvsVNYy8yJ4ewwj2IxLLFnQgQ2CRfCtOKBTryPK99t3jxzB4pBkFMF1E7lgVtc1BbywIqJdOwToGNIA0zP8hSzAW8FiFTRkFwSgIt7PCKs5FkqL2nHi8mPxDdoEiVah2+rmNfoyschT99IMRhqMgXwYQiUBL53rczNK6BzAkhTFLDkv2fIOvBGZq0SrXf2Q6vDkLHHJGKv5oiA0MkaRoZ1dGiNTZmfaOhVcagQAoK9BKCkj IZvvL7Hp 6iCu2mTo57N0TxXmnfiqui0jdT7boL+HwGFiA2bBoCoM233IFse0GBf2R9Cf/xPkZq892dxPXR87yLkYTpHvsyvzO3sStbTbTFvblQPI4E86a3ptbM+GDoFf9njAYOHBMvDUBdWFpZhCSQb2SEj8AqUKEVDLoCzXZrsWm+yU4d5rhLdOZ13Cn+ID78wiUMkARgc44LV44omNp13Xh5ne0uIp8BTExpYFCEIrlkktP7dBe0+1SGimlXrlyR05S8m4aLUf2z7QV1O9/3bKHWXGPNABytYoC7A3DQlsnrV8qNle8c59C+05amUUgCw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/27/26 14:53, Vlastimil Babka (SUSE) wrote: > --- > Vlastimil Babka (SUSE) (13): > mm/slab: skip kfence objects in allocation profiling > mm/slab: remove objs_per_slab() > mm: move struct slabobj_ext to mm/slab.h > mm/slab: make slab_obj_ext() determine object index > mm/slab: abstract slabobj_ext.objcg access > mm/slab: abstract slabobj_ext.ref access > mm/slab: replace slab.stride with obj_exts_in_object > mm/slab: change struct slabobj_ext to a union > mm/slab: introduce slab_obj_ext_has_codetag() > mm/slab: reduce slabobj_ext memory with allocation profiling disabled > mm/slab: add cache_ and slab_needs_objcg() helpers > mm/slab: stop allocating objcg pointers when unnecessary > mm/slab, kfence, memcg: completely remove obj_ext for kfence objects > > Documentation/mm/allocation-profiling.rst | 7 ++ > include/linux/memcontrol.h | 13 -- > include/linux/slab.h | 3 + > mm/kfence/core.c | 12 -- > mm/kfence/kfence.h | 3 - > mm/kfence/kfence_test.c | 2 +- > mm/memcontrol.c | 40 ++++--- > mm/slab.h | 189 ++++++++++++++++++++++++------ > mm/slab_common.c | 26 +++- > mm/slub.c | 184 ++++++++++++++++++----------- > 10 files changed, 325 insertions(+), 154 deletions(-) > --- > base-commit: 5ff172f6c94d282d83cb88bdfec5f647ad9c6105 > change-id: 20260714-b4-objext_split-da82426257d5 Applied (with fixed up 10/13 per sashiko, and 09/13 with a debug check per Harry). To slab.git slab/for-7.3/objext_split and merged to slab/for-next.