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 849CACD8CAA for ; Tue, 9 Jun 2026 10:26:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EC4556B0092; Tue, 9 Jun 2026 06:26:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E9BA96B0093; Tue, 9 Jun 2026 06:26:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DB1D46B0095; Tue, 9 Jun 2026 06:26:27 -0400 (EDT) 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 CA1CF6B0092 for ; Tue, 9 Jun 2026 06:26:27 -0400 (EDT) Received: from smtpin29.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 8DD181404E2 for ; Tue, 9 Jun 2026 10:26:27 +0000 (UTC) X-FDA: 84859994814.29.DBAC724 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf18.hostedemail.com (Postfix) with ESMTP id BC1C71C0007 for ; Tue, 9 Jun 2026 10:26:25 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=lYANH0J+; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf18.hostedemail.com: domain of vbabka@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=vbabka@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1781000785; 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=F064lp4RYUWIWEZrBtaLhHrfLe3DbUKK7LrCz+/mRa8=; b=VzCeeuBYUx7osGKoyiIRPSZ8zTBdEIPvjMDK/1dkhR2o6HYg6aEkSfbhKKxuXWuth/hZaZ IHuv/as9QnGzvj7YauOl7ZWKTspHethdzLh1ShVpoRmB83YEpBOzxF5bUvHgcmUvBOZnUj JWKjYY4QtZdXbUtDHC9hhJZx7GN3qYg= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=lYANH0J+; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf18.hostedemail.com: domain of vbabka@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=vbabka@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1781000785; b=V0JGtAF94KxSZVB3F/qpLi6QUUYWpi3/iXaUlfeg1gX7ScJHi4c/hMeNusxKuQX54NzpIt E4eLRJ5MWKuC4TnTPUx1OgH+u/s2AlzQh79nOxlhcRDZO+osTMHox2FCILKjU3g3a/c3Re MKs+LsclXhYs1WHqUdnew9pa1xayRrY= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id C179341957; Tue, 9 Jun 2026 10:26:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A96BB1F00899; Tue, 9 Jun 2026 10:26:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781000784; bh=F064lp4RYUWIWEZrBtaLhHrfLe3DbUKK7LrCz+/mRa8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=lYANH0J+A6FqcKRF8IJmXs6TNG5G0he/x2pCGMgSpNd2SDCBWAYHI03bu29BBF/XH v1cpvR12px8orZTlNsHl8XmzW8teDMkoOo1TNwyy5Yfp0LVfOBbV76cbuDm/mGuxFY ztyGRa3N2a46wNGE3h4sWIh+g/rX7bPMIzwSRUN9NBq+jTzklZeso5jR83XffRa1y2 4/i84sgeCriZc8yuZBVFpIIDwkfxxQbOVHuKk8jvwb0pePJDiMerKWyAObOg/o01VH LGuVEsQG6tySfAmcgZe/tHkvSU+maiEFcO1lSeQ6j+ajihE4LMUMCuUo3gXVT8MOZW oYDkFmaflXxjA== Message-ID: Date: Tue, 9 Jun 2026 12:26:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] mm/khugepaged: use slab cache instead of normal kmalloc Content-Language: en-US To: Luka Bai , linux-mm@kvack.org Cc: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kairui Song , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Rik van Riel , Harry Yoo , Jann Horn , Johannes Weiner , linux-kernel@vger.kernel.org, Luka Bai References: <20260531-thp_collapse_hint-v1-0-e7f8c2035621@tencent.com> <20260531-thp_collapse_hint-v1-2-e7f8c2035621@tencent.com> 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: <20260531-thp_collapse_hint-v1-2-e7f8c2035621@tencent.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: BC1C71C0007 X-Stat-Signature: 4te6ykb1c399wfd91gnb74rpx7pqoms3 X-Rspam-User: X-HE-Tag: 1781000785-835871 X-HE-Meta: U2FsdGVkX1+gTveiqqQJYUw85gZDvc8d0sPX7LZvlbCG3q0hkdpdOOoL6PQWavD/0GwYdP8OCiRzMNYQp2j7dOZaZk54KErnWd7OLztPfDOBpIhJ7HYK+7Kvf51bbCamEC3sLoGo3pX0cdahgcMta0qGprQazrkCC8sMS935aZI20o7o+sgh73Ue4j5GZdL72xD05hMqC/3PCY7JcstlrbaKsQ5cxioZfIWnKC8WcXFeY36Ykj8vXSWyBfH32MlAxM7D85ut3MC/1uHTK6QbrE5OFq3FHKsyi6y74dGdlcFjMEF4YLPAbQ4zRG3uwz3dznMj4nEClUlv5NczhV3wY8wqPHkWkrmKbi7WcoytD1q6B+tcY4XXqwKP56l2phk3TLdFT+9QE1WyTRsdL+XoxKQ6U6V/a8SxgBvxCnDjnby0UciR52d+zS7P4pDTY9i/blCihpBnjtXmYxTQDscrIYHDQkx1qaNF7ondyu14omo8D3/FQFLjev62cKLLAdSRzN2n6YZk1tCH0XLPC6Un+0ev6v0hCGvf0C29iWt0vVRT0SLlD8/aaubHPUt3hDHRJ4P3/M/Rgkv4Q4puLHVOCaItnNRW1m76bXN9SNhHRxzCYWpHvord3UaDS3PQmf+xVAr9qy+7GoTOv6tVWUDvBG9aA61tGy9CLg1rMS73JUgTafNOzIN3T5rA6vQbvlB50xOgSo8rFiYaDcUj/xyD42vmQzhfpwkKL7Z/rESj+sZyTAFOTjV5ulfFKGuJ357mazH0aK4bZFK8b+YhhJdnZ9QxwD7so/l8OYnExJnglYwM3W3hdgmsPeRUcw0yYhagNkhcjCvkvdbiHsE6YRpluQje4+JT+UVuZxzOetEL6IcqE1euIJJ9meKO2DdjCbdzMDOacbuK/BleAyluow1BjIvOyw/xs3G9dmxmA4CkkMVZiIBcEfAnaey5XFXbuM1ZS/XuQedtqn3Ck63pGUA MxvJ9JyW wsnJxqLPy9m8yA6ZTUyi1FnUo9O7LrSwuqw+3PpJYnjMjnFLmhCzRQDoIHHazD5u4kSHBs7wt+fEaECH5Crs9XXOelsopg4cBXrjIDDpf5Vy3oe4Apr0v7NHFXA9NzQ0Tl+qq1Ue5F+BpOHJtcTGTGhlKlJBP7118uniL4+gyt5pmJTrUvCrNbjMspz8FZe7N193t36SsqHvP8BUWEUZjPO5uMYRawPLx1nNH5wml+8PhbCdVbuWbGKnXQOHNZq9eAP2Itrq6vKrYsVrC1y5rJQUqKxGgDeFW2aMz Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/31/26 06:23, Luka Bai wrote: > From: Luka Bai > > We added a kmem slab cached called collapse_hint_cache for > khugepaged collapse hint, to improve the performance in allocation > and freeing for the hint structs. > > Signed-off-by: Luka Bai Khugepaged isn't exactly a hotpath? Adding own cache comes with memory overhead, so this doesn't seem like a sufficient reason to do that.