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 9FE2F184 for ; Thu, 24 Jul 2025 13:01:25 +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=1753362086; cv=none; b=jL97sU3264j9W0XysFOonKd8WzNi3O/0yOiB+PUQsXhE95de+jRoydJKUcFTjET/nXdzM1SiAU10PHaBlV2yqq4Mo7u+BCDnANF81TGchzQm9i6fFgw0xFYyDPJH0In6DWtxXCkBc3Rhcb5IPxT0vkmsd+yxVsw2xTmxW73oLks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753362086; c=relaxed/simple; bh=X1gt0rB4BXfQtDvaqL6R+6uofnYdLYegVfaylDXX96w=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ldiFCttU2mELwyYceCrDxNAR+0Pi6a0MqxElLQ6leZXQxmiU0EcDIfryka+CCOYSKrwBdYEf4kFA+sr5x7cn9Q3HWVEyMDT2b8HRADkRb2IPb9wHkdxPoKYhuakC7hA9DutMj6GR4c2Ixho1KMvTEzEbKGRIVDPeGidMkGY2Kus= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EChqeJB0; 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="EChqeJB0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4F8EC4CEED; Thu, 24 Jul 2025 13:01:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753362085; bh=X1gt0rB4BXfQtDvaqL6R+6uofnYdLYegVfaylDXX96w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EChqeJB0/ObgkQSrAUMOF1yJCPu5p+GAVOdbBMI++bPtxCH816pVP5tuhhxlR2uAL +u0imyXSyDGdQBVjcveiZCjiu2mdoxDF/bPLVucOck0hMS8IWOk8wZCmY2GbjAEKfY nfZKfKlw4tDh+gdoocYH8WWfchuFkvBiGPnQhowArARWHNOy/QgwaKD5z9uu/BdHMF H5LdxsMoGcTP3+sBLMKRUD5/nsi4ZNKCP1oWUMiHT1FlHr3AzW9DUdt+tKPvPHSg8r IfQT2WQdTiU4ilrRAaomvxGjCGUGqHu7l3igrBwB3z+znx5fRfEN9YtLaa/ZkcyGxK xMH3/8aake6uw== Date: Thu, 24 Jul 2025 15:01:22 +0200 From: Frederic Weisbecker To: Gabriele Monaco Cc: linux-kernel@vger.kernel.org, Anna-Maria Behnsen , Thomas Gleixner , Waiman Long Subject: Re: [PATCH v8 6/7] cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping Message-ID: References: <20250714133050.193108-9-gmonaco@redhat.com> <20250714133050.193108-15-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: <20250714133050.193108-15-gmonaco@redhat.com> Le Mon, Jul 14, 2025 at 03:30:57PM +0200, Gabriele Monaco a écrit : > Currently the user can set up isolated cpus via cpuset 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 blocking any assignation that would cause > the union of domain isolated cpus and nohz_full to covers all CPUs. > > Signed-off-by: Gabriele Monaco Acked-by: Frederic Weisbecker -- Frederic Weisbecker SUSE Labs