From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751438AbdBFRDX (ORCPT ); Mon, 6 Feb 2017 12:03:23 -0500 Received: from verein.lst.de ([213.95.11.211]:35786 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751728AbdBFRDQ (ORCPT ); Mon, 6 Feb 2017 12:03:16 -0500 Date: Mon, 6 Feb 2017 18:03:13 +0100 From: Christoph Hellwig To: Keith Busch Cc: Christoph Hellwig , Joe Korty , linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs Message-ID: <20170206170313.GB31902@lst.de> References: <20170204015809.GA16203@zipoli.ccur.kvm> <20170205164023.GA9281@lst.de> <20170206170304.GF24601@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170206170304.GF24601@localhost.localdomain> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 06, 2017 at 12:03:05PM -0500, Keith Busch wrote: > Can we use the online CPUs and create a new hot-cpu notifier to the nvme > driver to free/reallocate as needed? We were doing that before blk-mq. Now > blk-mq can change the number hardware contexts on a live queue, so we > can reintroduce that behavior to nvme and only allocate what we need. That could be a next step, but given how badly I keep messing up core IRQ bits we'll probably want to wait for two rewrites of those bits from Thomas before moving on :)