From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F2CB039FD4; Wed, 15 Apr 2026 10:02:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776247369; cv=none; b=rRfCiuESSENvcp4H+LSSbmz5N8sddPRznfijS2E1BieaDz01xYNoRpH33mnEukPQKm8Rhp1Fh1xZImTO9AlWHKDI9cM8+a8EGuNnAi/dKPChBsYMPTZOfmb9bW48KJoF8ZmELTunr/9rACj9pGTeSiIPGbShOE3H+sIvfLvWdX0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776247369; c=relaxed/simple; bh=PiXJdW3kZWWKz5fjJpgKb9m4Wz+/cknIAv+flbdQIuw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=qaGv1etRnk6K/37xxL8W7qqz/LEmmmtebj8TnQVaV9ygBgzUIV5QE38GPOAqmLAa7nF20OYzHEsaf2qw+HYobdPxHmNKrBetfkaUxqfSYJ8d0OE0GToYb1MYGSXaNRxKvZQFRkiNbmoFNHTVSMNicxTKMTFBowcyAUKJ+nnGmkk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gQhxAiKe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gQhxAiKe" 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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