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 DE2F9288C32 for ; Mon, 7 Jul 2025 11:28:37 +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=1751887719; cv=none; b=Wr4SoNBA6zkbHM4F6/fIbMsArarYhxpVA/ocCe6KIa+jszRjNK2XV86oHdtRprie1bJnLdk24v/WLCakCiUahNBGPKOzragSrZyLG4qZlJRlfx2iTMeURU/Ml53e1lCkEzbDFVDQp0a3xT0ObzcsU/BgVpTAYgi6mlJOMCIaCbw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751887719; c=relaxed/simple; bh=EA0hpz1UbcidrfIudaAkghUylB3IlkSpgXf2f5joHZk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jFT4EMK9Mb/lTdRC75XGD9GSgv9Qd/kwXSAuJPhmIdZpA8tzIZWktC5euzUO5hO/gvDYR7OFZBDtPcgV0C2uhvwzF5fFCgbLu6lapMMCdgc8o2dl//FDQOrUP88XuIDKoO5dz8kez4QcdWvteIEhRFS/or0ymKDpn1jflfbJPV8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bJxlFdSS; 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="bJxlFdSS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17403C4CEE3; Mon, 7 Jul 2025 11:28:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751887717; bh=EA0hpz1UbcidrfIudaAkghUylB3IlkSpgXf2f5joHZk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bJxlFdSS3WDgLvMAFDVDS0opoBzXxi8jYos6Doi52ULQNW7f0osIGoNdmEuhHnVqo 5FIKWuE7i0VbshYfV2dfOj4qcMV+MiDMY2fv5eFHnTwLlTpH4juiQPg5bKkXlhu0DT iYiYNodZcciD15TFILEIUdtPRNWc+Ft1jRMjtquFpmlBOLylA+5wit7WLm3/QYJYfH EdLAiFK6iVGEiyZ1jkpgG95CTflqWfNTf26iVz4bUzLDSrblIKJQnonHi1NwCfhbov /UYTUxvcwAN0nMGYybRdaO/h9LWStBgWnePYeCEC4HCXUJiw96SIVy1R1mnovbknJX 6fGlz8nYa+fgw== Date: Mon, 7 Jul 2025 13:28:34 +0200 From: Frederic Weisbecker To: Gabriele Monaco Cc: linux-kernel@vger.kernel.org, Anna-Maria Behnsen , Thomas Gleixner , Waiman Long Subject: Re: [PATCH v7 5/7] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any Message-ID: References: <20250626114900.106061-1-gmonaco@redhat.com> <20250626114900.106061-6-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: <20250626114900.106061-6-gmonaco@redhat.com> Le Thu, Jun 26, 2025 at 01:48:58PM +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 and nohz_full covers all CPUs. > > Signed-off-by: Gabriele Monaco Reviewed-by: Frederic Weisbecker -- Frederic Weisbecker SUSE Labs