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 504AC106B53D for ; Wed, 25 Mar 2026 14:04:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9BABB6B0092; Wed, 25 Mar 2026 10:04:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 992D26B0093; Wed, 25 Mar 2026 10:04:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8D04E6B0095; Wed, 25 Mar 2026 10:04:43 -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 80F606B0092 for ; Wed, 25 Mar 2026 10:04:43 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id E424A1B8D8E for ; Wed, 25 Mar 2026 14:04:42 +0000 (UTC) X-FDA: 84584756004.17.AF7A98D Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf08.hostedemail.com (Postfix) with ESMTP id E9A4E160027 for ; Wed, 25 Mar 2026 14:04:39 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=cYYVo4mP; dmarc=pass (policy=none) header.from=infradead.org; spf=none (imf08.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1774447480; a=rsa-sha256; cv=none; b=L5Dvve+b0fPLUW+nmN5ZlR4TO47gYVOqaMCwLVDReoFU8CnMSJMubSS1zr3usuFv8ftF32 aQfDRN7ANN6RYrP+A/RkjfRWZXNgR8Pknf9m3UYiCjQHaS7r/GKF7kJ3o0SALeFzs0cTIV aZdFedzxYHZ1Nzdya386C2bF1Te9EFc= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=cYYVo4mP; dmarc=pass (policy=none) header.from=infradead.org; spf=none (imf08.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774447480; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=C4hYkSjHXLlG/lE5YtgFwfQzyiouzhk/stE8uZzNUns=; b=E1nK8Qi/YzZ8OXGWmJMowligLI4WNQeVePH0Yd8rJL/xj3fArJWsHZzl+6udMFOTwDS7Au orBS8ZitVaKnA/URQ1nC7/SmuDAaScQQYfkDv1XNNLY402gASxkdFsegoxVIJBwf6jXmQb MTF4lWeY9pxctizl0PSPovJe5x+ewRQ= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=C4hYkSjHXLlG/lE5YtgFwfQzyiouzhk/stE8uZzNUns=; b=cYYVo4mP2OcLhkLMLgnRlVDiEF 9AvuTzF5T7Kvd1ShLQUTaSmF+gfsg/5R3+oiXFfJEdEcmB5USWlZa2IwOzaOEqZ1EcxES4esSOJkE IiH41k0iX+TIHwPfwscNPXmDtsMWsHF4wkJAhRSuXqpUm1fDr7MHi50UvuMFxjbmDrhuBRgD6b/ZM xI6esliOzQmKU5ZwPIGeDpmE2k8jJieIPJ3BQzZTiI32O7JEeLmbGcMc+1oO2szXXZyzPZ6eZufXt xkBcRkO+6V7j6qqpejq1FEMh/TSemHA268NiOOrSZpd5+jZzzyvboZMbbnQ9AvGlaPHMupsB0wDM0 yunp/kXA==; Received: from 2001-1c00-8d85-5700-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:5700:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1w5OqX-0000000FxZh-16yX; Wed, 25 Mar 2026 14:04:33 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id D298D300578; Wed, 25 Mar 2026 15:04:32 +0100 (CET) Date: Wed, 25 Mar 2026 15:04:32 +0100 From: Peter Zijlstra To: Qiliang Yuan Cc: Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Thomas Gleixner , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Tejun Heo , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Anna-Maria Behnsen , Ingo Molnar , Shuah Khan , linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 13/15] sched/isolation: Implement sysfs interface for dynamic housekeeping Message-ID: <20260325140432.GE3738786@noisy.programming.kicks-ass.net> References: <20260325-dhei-v12-final-v1-0-919cca23cadf@gmail.com> <20260325-dhei-v12-final-v1-13-919cca23cadf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260325-dhei-v12-final-v1-13-919cca23cadf@gmail.com> X-Stat-Signature: 1cghxf58ferneaodsohag6g13rrwk6ho X-Rspamd-Queue-Id: E9A4E160027 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1774447479-607076 X-HE-Meta: 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 MxJP5XlI j7QiFEj/PA3Xbi8yeOXzCAH6ZEWrbrafTAQCiygTd27k6Urx+zOuTWOnIvL9U21IY22Srpzb73aYJ8C1iLzODZcanSN5/UaoEbGxjrrqTSpXj4BoXdf+QUEFu68KykLXApsEtYYWEpffihkVDWyrimn1nlt2mIqxPzmJXHYi5F1xcBZQJIQlMtk6OWw752NJ0KbSCEgFGRxPadM7cReT8TlHgH7QIT0vlQn7W8/fLSCigX7va4WQIfr1IfcejTbvoWWJLnBKI7thfg1uD8ME4HGZZXPLnWQdKHcTiHc5yjwypuxMoiBeGKJkGyw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Mar 25, 2026 at 05:09:44PM +0800, Qiliang Yuan wrote: > Subsystem housekeeping masks are currently static and can only be set > via boot-time parameters (isolcpus, nohz_full, etc.). There is no > userspace interface to reconfigure these boundaries at runtime. > > Implement the DHEI sysfs interface under /sys/kernel/housekeeping. > Why? What was wrong with cpusets?