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 C52A31A83F0 for ; Fri, 20 Dec 2024 09:04:54 +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=1734685496; cv=none; b=rK0OdfVnW3SpVr70TiJGLoKeOPhZz+LRv8zH6oXZRo+tZI4vHxQ/o4hQBzyJ5k+RLn9lwZ0gQXjZ5B4HkDibpJXG0InCK7by5ye0piDmalk6fR2JIbL/SDUVYnOEdrzbl5GrRqgoimRQ6FAal2M2XsgltbkviscclqdeSXps57o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734685496; c=relaxed/simple; bh=23QV/Z0ncYZtoK3/rhdLeNgePmQZYVuuHiMosMT5tyo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jBApdT+wfMyt07yrCjmNeBlLyW/FEqI7MeOaZB5hlr94/CiQkwyoyTuT1BIOcK40CSf9lGxezrKlPYCCOTA4RRTioCbmqNFTFk2gPv3mpC6cAz1CE9sV1qGWt70Zpuqacpun/Wtt88KTV3e6/4q0nkU1Vlr5hBlidOVqU9G3u44= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=SEuGnJVv; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="SEuGnJVv" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1734685493; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TNCekzdNJZmUuGpzwzOxUn2DY6eci5HZ8lsy1e03Zho=; b=SEuGnJVvW27H54VFC6K1jq2v6R/kGJhhpoM6PGv22B4ahsO7kCeLH7sPAgjpv79ur9PHDB RjTRvqWn4fOhSQluilB/WcCJ33uwrhjER+pAHuokCht5VCzq2OnNnB2U7eUJ5oJ05+r4K8 iK2wG0kxn5rSFROel3t44LS12Mlw/qc= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-9-V_hpjVgqOaWhO_PeQOMseg-1; Fri, 20 Dec 2024 04:04:50 -0500 X-MC-Unique: V_hpjVgqOaWhO_PeQOMseg-1 X-Mimecast-MFC-AGG-ID: V_hpjVgqOaWhO_PeQOMseg Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 53E431956048; Fri, 20 Dec 2024 09:04:46 +0000 (UTC) Received: from fedora (unknown [10.72.116.29]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E4FDE195608A; Fri, 20 Dec 2024 09:04:24 +0000 (UTC) Date: Fri, 20 Dec 2024 17:04:19 +0800 From: Ming Lei To: Daniel Wagner Cc: Jens Axboe , Keith Busch , Christoph Hellwig , Sagi Grimberg , Kashyap Desai , Sumit Saxena , Shivasharan S , Chandrakanth patil , "Martin K. Petersen" , Nilesh Javali , GR-QLogic-Storage-Upstream@marvell.com, Don Brace , "Michael S. Tsirkin" , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , Eugenio =?iso-8859-1?Q?P=E9rez?= , Xuan Zhuo , Andrew Morton , Thomas Gleixner , Costa Shulyupin , Juri Lelli , Valentin Schneider , Waiman Long , Michal =?iso-8859-1?Q?Koutn=FD?= , Frederic Weisbecker , Mel Gorman , Hannes Reinecke , Sridhar Balaraman , "brookxu.cn" , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, storagedev@microchip.com, virtualization@lists.linux.dev Subject: Re: [PATCH v4 9/9] blk-mq: issue warning when offlining hctx with online isolcpus Message-ID: References: <20241217-isolcpus-io-queues-v4-0-5d355fbb1e14@kernel.org> <20241217-isolcpus-io-queues-v4-9-5d355fbb1e14@kernel.org> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241217-isolcpus-io-queues-v4-9-5d355fbb1e14@kernel.org> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 On Tue, Dec 17, 2024 at 07:29:43PM +0100, Daniel Wagner wrote: > When we offlining a hardware context which also serves isolcpus mapped > to it, any IO issued by the isolcpus will stall as there is nothing > which handles the interrupts etc. > > This configuration/setup is not supported at this point thus just issue > a warning. As I mentioned on patch 8, this io hang is regression on existed applications which can work just fine with 'isolcpus=managed_irq'. Do you think the added warning will prevent people from complaining the regression? :-) Thanks, Ming