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 7B8B0F4198C for ; Wed, 15 Apr 2026 10:02:52 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A52F16B0096; Wed, 15 Apr 2026 06:02:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A2AE96B0098; Wed, 15 Apr 2026 06:02:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 968206B0099; Wed, 15 Apr 2026 06:02:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 8893D6B0096 for ; Wed, 15 Apr 2026 06:02:51 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 3528B13A9E2 for ; Wed, 15 Apr 2026 10:02:51 +0000 (UTC) X-FDA: 84660351342.13.A87D18E Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf26.hostedemail.com (Postfix) with ESMTP id 8BF2F14000E for ; Wed, 15 Apr 2026 10:02:49 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=gQhxAiKe; spf=pass (imf26.hostedemail.com: domain of frederic@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=frederic@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1776247369; 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=f3n4iWaSs/X7nhGkPWfWqOpyvbwnwhRA4EfuF7TC5M4=; b=GeFO0sZLwVghZ9TM5KmMQsO9oNxHIAKIwGFeGo/+s8lKgL5yicf+iRkGugB9zycjUZYwxy QOsUZf0HtmP2+2h0rGK5D/Ttl172ItBgTtdFoHJ+Ik2ez3Y+243BhURNItL1G0nXlzDVsM EBCnPpcXniAwtYPT0JlvqyPw2gIlQOU= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1776247369; a=rsa-sha256; cv=none; b=xUJAs4cOlgPCbNOIBswU72o3kIInn5I/DNd4+y79u8pdHPP/km6cAwablbRNBTijU2zUhJ VY9LdKG0MuyjSDHB9ylbz3vyDT6KCn5/NIFTa0n2Kw6Ydb6xokMy61UNohlBsOWBh2yZTY JXzKbq22mc8SqweG7jV72A/J00YwNZM= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=gQhxAiKe; spf=pass (imf26.hostedemail.com: domain of frederic@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=frederic@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id D867C600AD; Wed, 15 Apr 2026 10:02:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20ECEC19424; Wed, 15 Apr 2026 10:02:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776247368; bh=PiXJdW3kZWWKz5fjJpgKb9m4Wz+/cknIAv+flbdQIuw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=gQhxAiKeGXat7xSllrdQgMuU3NlrY5J4zXg7WbTjtLVim6Pa+EFRh5ab5us4ML0tb YB6BVgh5tuDWN+LUkb9oK6q+8zti+kGwuWOROVuxvpib5nOIJ47auNzzZK9vvOJeYK iLfjRw7PwWfxmE6JpftYw8riHE5Gp1jIAQKtFWQlMvDvxfPL7FTNZGFQDOS23p4Y66 c45Y/UE6uE1WWgq2oWcsxXBgEbThqAE9D3xfvpPJ12JKymhYypKk4jcuDt5TWKYOOv TtA0pFuBoSlaORK0YghptTx42cO1k6TPIF7P3/+ZMviNa2UfliakbM+aV29yJ98xyG /NWLvUBGTJRCQ== Date: Wed, 15 Apr 2026 12:02:46 +0200 From: Frederic Weisbecker To: Waiman Long Cc: Qiliang Yuan , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Anna-Maria Behnsen , Ingo Molnar , Thomas Gleixner , Tejun Heo , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Chen Ridong , Michal =?iso-8859-1?Q?Koutn=FD?= , Jonathan Corbet , Shuah Khan , Shuah Khan , linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v2 01/12] sched/isolation: Separate housekeeping types in enum hk_type Message-ID: References: <20260413-wujing-dhm-v2-0-06df21caba5d@gmail.com> <20260413-wujing-dhm-v2-1-06df21caba5d@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 8BF2F14000E X-Stat-Signature: as4qs6w4icdu4gg6caad9icckdiwkacq X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1776247369-642823 X-HE-Meta: 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 l9d1o5oL zynq1cU2MH6PT8g7XpLDaE2DDDrJVnTTEA7tOBOKnwCXOURxkXyO5W96aSS04NvDOvRT4e2+2raT4yDk+OtHqareVFf9Q3nuHiISSzawmsDBxQXaLnu6Ye+RoHUz1rhDhhssuxWPXxzmUkFGq3IfqqQi2V4HWh9ufZep9JfrZgiOp/fcbjNpVxrH+00qhlWYPIKmXde2qx+NFhcm/3ed9q+ZsQRJqXgJbCXlUupR9g9cleVEGKauRFHpLzaQK5uZ90KhrkHLJsc3A/tYcBwno4IVyo5AGL87kebA3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Le Mon, Apr 13, 2026 at 03:25:46PM -0400, Waiman Long a écrit : > On 4/13/26 3:43 AM, Qiliang Yuan wrote: > > Most kernel noise types (TICK, TIMER, RCU, etc.) are currently aliased > > to a single HK_TYPE_KERNEL_NOISE enum value. This prevents fine-grained > > runtime isolation control as all masks are forced to be identical. > > > > Un-alias service-specific housekeeping types in enum hk_type. This > > separation provides the necessary granularity for DHM subsystems to > > subscribe to and maintain independent affinity masks. > > Usually, if we want to run a latency sensitive workload like DPDK, we try to > minimize all sorts of kernel noises or interference as much as possible. Do > you have a good use case where it is advantageous to remove some types of > kernel noises from a given set of CPUs but not the others? Right what we want to do here is to remove the aliases (HK_TYPE_TIMER, HK_TYPE_WQ, ...) and rename them to HK_TYPE_KERNEL_NOISE. Thanks. -- Frederic Weisbecker SUSE Labs