Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752206AbdGDPRV (ORCPT ); Tue, 4 Jul 2017 11:17:21 -0400 Received: from mail-pf0-f172.google.com ([209.85.192.172]:33006 "EHLO mail-pf0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751536AbdGDPRU (ORCPT ); Tue, 4 Jul 2017 11:17:20 -0400 Subject: Re: [GIT pull] irq updates for 4.13 To: Linus Torvalds , Thomas Gleixner , Max Gurtovoy , Christoph Hellwig Cc: LKML , Andrew Morton , Ingo Molnar , "H. Peter Anvin" References: From: Jens Axboe Message-ID: <20a3d23f-2e56-e118-a355-e05dfcebe001@kernel.dk> Date: Tue, 4 Jul 2017 09:17:17 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 623 Lines: 16 On 07/03/2017 06:00 PM, Linus Torvalds wrote: > But I'd like people to look at that - not so much due to the evil > merge itself (but check that too, by any means), but just because the > code seems fundamentally broken for the hotplug case. We end up > picking a possible metric shit-ton of CPU's for queue 0, if they were > "possible but not online". > > If they ever do come online, does that get fixed? I don't know. > Somebody should check. Yes, the blk-mq cpu hotplug code updates mappings when CPUs come and go, so that part is fine. That's exercised everytime the laptop is suspended and resumed. -- Jens Axboe