From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934670AbeBMQMX (ORCPT ); Tue, 13 Feb 2018 11:12:23 -0500 Received: from mail-io0-f173.google.com ([209.85.223.173]:32875 "EHLO mail-io0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934056AbeBMQMW (ORCPT ); Tue, 13 Feb 2018 11:12:22 -0500 X-Google-Smtp-Source: AH8x224vdfr3V7MwuQ+C7zlZpxj/RfzfCarHPdcsM42XvdKpMDATosJ34ZLusFrUbwFBRdRIjFZE8Q== Subject: Re: [PATCH v3] blk: optimization for classic polling To: Nitesh Shetty , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: axboe@kernel.dk, linux-nvme@lists.infradead.org, joshi.k@samsung.com References: <3578876466-3733-1-git-send-email-nj.shetty@samsung.com> <1518536892-2051-1-git-send-email-nj.shetty@samsung.com> From: Jens Axboe Message-ID: Date: Tue, 13 Feb 2018 09:12:18 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Thunderbird/58.0 MIME-Version: 1.0 In-Reply-To: <1518536892-2051-1-git-send-email-nj.shetty@samsung.com> 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 On 2/13/18 8:48 AM, Nitesh Shetty wrote: > This removes the dependency on interrupts to wake up task. Set task > state as TASK_RUNNING, if need_resched() returns true, > while polling for IO completion. > Earlier, polling task used to sleep, relying on interrupt to wake it up. > This made some IO take very long when interrupt-coalescing is enabled in > NVMe. Thanks, applied. -- Jens Axboe