From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 B497E284B3B for ; Fri, 8 Aug 2025 15:20:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754666447; cv=none; b=B20gdoDcwpn36bQccyJ1htG+ugfst2EPk0wbp9zvDCnCENOOxutXLKU7HdcsN/QMtLuDxqr2cKBuTot0LVvvm/CIJ/zUHzrWVA2EZ/LqLWpqQKYQBgtjEWVAma6LWr/kNK1QavRYF9fTvqthtS2fz1WriVMZRhb6j/rApGZ/j/U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754666447; c=relaxed/simple; bh=KhnDnewWmNF5LBNjEEZdjlT1+NiVfMU/hEwiwCzSkY8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=A+3rfFMB1uYwb0qrve7/+k55ur6dWgXW41kt339nUxzPYAo2yg0KYy6JvE0TOJfKDOGxYZY1WTaybI6Je1FulHLRSyBVZpMO0JBle3z4HwATTGHalx0VNFIT74pM7yyq3i6Z3A46qwipP7XoL4wp/u7zdEtrq8iSfyEgBoBTPrs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=MYuYz/y+; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="MYuYz/y+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754666444; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AxJEYuuRH3QK9/Cdhoov2KDfqFceQ8tv5+6IbkX7B5U=; b=MYuYz/y+QnMxVPLDRnBbvm1nb5PDCQihcDn96s1bYM3vdt4hoe+4QLIlsREfYTvOoUiCUU eR8VfNDXq4d0OY9Egh94pIbO36DXYMwxQozPmGhGGgHA0JTqFOWi2aPRvPnz/OCvLPtBEY GQHvrqLZMcRCDudVnynekAsbthMO5YQ= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-261-JK_dUM0TP86Dh_KVi_TrBw-1; Fri, 08 Aug 2025 11:20:39 -0400 X-MC-Unique: JK_dUM0TP86Dh_KVi_TrBw-1 X-Mimecast-MFC-AGG-ID: JK_dUM0TP86Dh_KVi_TrBw_1754666434 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 96322180028C; Fri, 8 Aug 2025 15:20:34 +0000 (UTC) Received: from llong-thinkpadp16vgen1.westford.csb (unknown [10.22.65.37]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 48E23180029B; Fri, 8 Aug 2025 15:20:28 +0000 (UTC) From: Waiman Long To: Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Jonathan Corbet , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Anna-Maria Behnsen , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Valentin Schneider , Shuah Khan Cc: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Phil Auld , Costa Shulyupin , Gabriele Monaco , Cestmir Kalina , Waiman Long Subject: [RFC PATCH 12/18] tick/nohz: Introduce tick_nohz_full_update_cpus() to update tick_nohz_full_mask Date: Fri, 8 Aug 2025 11:19:55 -0400 Message-ID: <20250808152001.20245-3-longman@redhat.com> In-Reply-To: <20250808151053.19777-1-longman@redhat.com> References: <20250808151053.19777-1-longman@redhat.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 When the list of HK_FLAG_KERNEL_NOISE housekeeping CPUs are changed, we will need to update tick_nohz_full_mask so that dynticks can work correctly. Introduce a new tick_nohz_full_update_cpus() function that can be called at run time to update tick_nohz_full_mask. Signed-off-by: Waiman Long --- include/linux/tick.h | 2 ++ kernel/time/tick-sched.c | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/tick.h b/include/linux/tick.h index ac76ae9fa36d..34907c0b632c 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -272,6 +272,7 @@ static inline void tick_dep_clear_signal(struct signal_struct *signal, extern void tick_nohz_full_kick_cpu(int cpu); extern void __tick_nohz_task_switch(void); extern void __init tick_nohz_full_setup(cpumask_var_t cpumask); +extern void tick_nohz_full_update_cpus(cpumask_var_t cpumask); #else static inline bool tick_nohz_full_enabled(void) { return false; } static inline bool tick_nohz_full_cpu(int cpu) { return false; } @@ -297,6 +298,7 @@ static inline void tick_dep_clear_signal(struct signal_struct *signal, static inline void tick_nohz_full_kick_cpu(int cpu) { } static inline void __tick_nohz_task_switch(void) { } static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { } +static inline void tick_nohz_full_update_cpus(cpumask_var_t cpumask) { return false; } #endif static inline void tick_nohz_task_switch(void) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 87b26a4471e7..9204808b7a55 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -604,6 +604,12 @@ void __init tick_nohz_full_setup(cpumask_var_t cpumask) tick_nohz_full_running = true; } +/* Get the new set of run-time nohz CPU list from cpuset */ +void tick_nohz_full_update_cpus(cpumask_var_t cpumask) +{ + cpumask_copy(tick_nohz_full_mask, cpumask); +} + bool tick_nohz_cpu_hotpluggable(unsigned int cpu) { /* -- 2.50.0