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 7A97E2F6178 for ; Tue, 2 Sep 2025 12:19:38 +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=1756815578; cv=none; b=uIwQ10BtNj+tzp1uxXbrGWFOSGMqEhvdfNkZWdFGkLAYNn0Hjw8AsV9HtrqAJchEdQBGOLa9fHwszzKvVlug48BSp9rtAn8fe1DjUWUTp9E+KkF1KvGlPY632cNqwL+yp91gzgbOc/6cLDVyz0PBNuJEHzy8dWWoBZn7wRcqQaU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756815578; c=relaxed/simple; bh=XOiN0aqB7+v6nWqmb6IWeb//XAyuKTRXDtPlUA3BbPI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Lgj07zbRp+ls+4qHs8ZoRAmiMeg7D2owcFq9cKXet2i6MBk0E5Tr4kJVLEBL25kJOD6rrBOhwIXpjFQl2b03HRLB+CoEn+GXjnpMqNMk1ygVz2N9/HZ0bgomU+hVqX4uoYdRhURIfIqPtsMMh/25AD7/S9rIxqrr14ha/dK3pWM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EUktvyRy; 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="EUktvyRy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C635AC4CEED; Tue, 2 Sep 2025 12:19:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756815578; bh=XOiN0aqB7+v6nWqmb6IWeb//XAyuKTRXDtPlUA3BbPI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EUktvyRyfplA0PBBbXN35hISQ7bpf0njfITwwOQLU727qPwTR40HZ9e4q002nvTZv zjGTufr/W74IszAOaE81ounF3T2LMqdcbPQZxrCCB54W1/xzfrvTeHXZlWs8uX2bsk wfynsKDFOfSvEDfvKNqmXHbriUp9esNFWPFtg04LDjhNEBsb0O05B9gToQWXYuHcio FQOOwFTYnkX4C4i6JvCdUdvu40kCoZ8LDv5aHXLpa2TtW7FSrM69nhLeUdIHuSTIF9 clYydjwJ7AzKlfAoNVZKGk/BetyUVSBae+aTUocJact3aR+UZCkvcS+r6vI94PycE0 Lgf+CS1h1ER2A== Date: Tue, 2 Sep 2025 14:19:35 +0200 From: Frederic Weisbecker To: Gabriele Monaco Cc: linux-kernel@vger.kernel.org, Anna-Maria Behnsen , Thomas Gleixner , Waiman Long Subject: Re: [PATCH v11 6/8] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any Message-ID: References: <20250808160142.103852-1-gmonaco@redhat.com> <20250808160142.103852-7-gmonaco@redhat.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: <20250808160142.103852-7-gmonaco@redhat.com> Le Fri, Aug 08, 2025 at 06:01:40PM +0200, Gabriele Monaco a écrit : > Currently the user can set up isolcpus and nohz_full in such a way that > leaves no housekeeping CPU (i.e. no CPU that is neither domain isolated > nor nohz full). This can be a problem for other subsystems (e.g. the > timer wheel imgration). > > Prevent this configuration by invalidating the last setting in case the > union of isolcpus (domain) and nohz_full covers all CPUs. > > Signed-off-by: Gabriele Monaco Reviewed-by: Frederic Weisbecker -- Frederic Weisbecker SUSE Labs