Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753365AbdCORD3 (ORCPT ); Wed, 15 Mar 2017 13:03:29 -0400 Received: from mail-wm0-f44.google.com ([74.125.82.44]:38776 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752901AbdCORDX (ORCPT ); Wed, 15 Mar 2017 13:03:23 -0400 Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: [PATCH RFC 10/14] block, bfq: add Early Queue Merge (EQM) From: Paolo Valente In-Reply-To: <64ef5694-d62d-e14c-ce80-a213c406bf22@kernel.dk> Date: Wed, 15 Mar 2017 18:02:46 +0100 Cc: Tejun Heo , Fabio Checconi , Arianna Avanzini , linux-block@vger.kernel.org, Linux-Kernal , Ulf Hansson , Linus Walleij , broonie@kernel.org, Mauro Andreolini Message-Id: <609A716A-F334-4A17-AA87-695CF789DFB2@linaro.org> References: <20170304160131.57366-1-paolo.valente@linaro.org> <20170304160131.57366-11-paolo.valente@linaro.org> <64ef5694-d62d-e14c-ce80-a213c406bf22@kernel.dk> To: Jens Axboe X-Mailer: Apple Mail (2.3124) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id v2FH4Adq008517 Content-Length: 900 Lines: 37 > Il giorno 15 mar 2017, alle ore 17:56, Jens Axboe ha scritto: > > On 03/04/2017 09:01 AM, Paolo Valente wrote: >> @@ -6330,7 +7012,41 @@ static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq, >> >> static void __bfq_insert_request(struct bfq_data *bfqd, struct request *rq) >> { >> - struct bfq_queue *bfqq = RQ_BFQQ(rq); >> + struct bfq_queue *bfqq = RQ_BFQQ(rq), *new_bfqq; >> + >> + /* >> + * An unplug may trigger a requeue of a request from the device >> + * driver: make sure we are in process context while trying to >> + * merge two bfq_queues. >> + */ >> + if (!in_interrupt()) { > > What's the reason for this? None :( Just pre-existing, working code that I did not update, sorry. > Don't use in_interrupt() to guide any of > your decision making here. > Of course, sorry for these silly mistakes. Thanks, Paolo > -- > Jens Axboe >