From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B98C4C4338F for ; Thu, 5 Aug 2021 17:42:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CB9461104 for ; Thu, 5 Aug 2021 17:42:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232401AbhHERmX (ORCPT ); Thu, 5 Aug 2021 13:42:23 -0400 Received: from mail-pj1-f43.google.com ([209.85.216.43]:45974 "EHLO mail-pj1-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231225AbhHERmW (ORCPT ); Thu, 5 Aug 2021 13:42:22 -0400 Received: by mail-pj1-f43.google.com with SMTP id m10-20020a17090a34cab0290176b52c60ddso11294968pjf.4 for ; Thu, 05 Aug 2021 10:42:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=dU531f21BXDNharoKE8ruDXQphQ1CSt9jQ0hwIzXdUE=; b=dg7ewrlpDMnzwmHJ1lmNItYksqJQ+qyVfQw3Hib33sOEOIEapqFJlhMqMnjEeXqo1g OpuiBKkDuabzp85pzMuL0gqorIrKcuH31Jt9pDoXDGMaBSh3IK3f0vVjFAygyxSxp9+6 ci/UKrPcmpQQeLmVYSH88/mzrhMadT19oE0DZiKA31gjGHBnHW/lUyF06c4XnfrLIKDL 03+RUHBxpt/2wdnLQLfL5J1QihEgXARCgveKzLChT1dvql/v/ZtD+IdVJUiSfWLv57IM LA0dSTr8wVISUDYvd2ONMYlYyTdH38Rn0zyZSOO9R6HbT7gjrZ+GAAUl74fuzLrHfAhI 1iqw== X-Gm-Message-State: AOAM532OPpUUQajNylMjqNrJrKLcBGo0oK9yLtC0BYg6XI57kHW1qzfP 2esWnf3HqdwlTIbAZvwAaps= X-Google-Smtp-Source: ABdhPJzI2kuHYCgF9y+XvvNd7PsPhN7YqRDvaEkFF9PhDbCHYPpoI3DvxG8SOQxET1CPvWF4UW74YA== X-Received: by 2002:a63:cd4c:: with SMTP id a12mr259576pgj.449.1628185328151; Thu, 05 Aug 2021 10:42:08 -0700 (PDT) Received: from bvanassche-linux.mtv.corp.google.com ([2620:15c:211:1:93c2:eaf5:530d:627d]) by smtp.gmail.com with ESMTPSA id m11sm10381834pjn.2.2021.08.05.10.42.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Aug 2021 10:42:07 -0700 (PDT) From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Jaegeuk Kim , Bart Van Assche Subject: [PATCH v3 0/2] Change the default loop driver I/O scheduler Date: Thu, 5 Aug 2021 10:41:58 -0700 Message-Id: <20210805174200.3250718-1-bvanassche@acm.org> X-Mailer: git-send-email 2.32.0.605.g8dce9f2422-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hi Jens, The two patches in this patch series change the default I/O scheduler of request queues created by the loop driver from 'mq-deadline' into 'none'. Please consider these two patches for inclusion in the Linux kernel. Thanks, Bart. Changes compared to v2: - Dropped the patch that makes the loop driver queue depth configurable via a kernel module parameter. - Added a q->tag_set test in patch 1/2. Although I'm not sure this test is still needed after Christoph's latest queue creation rework, it doesn't harm. Changes compared to v1: - Introduced BLK_MQ_F_NO_SCHED_BY_DEFAULT and use it in the loop driver. - Removed BLK_MQ_F_NO_SCHED again from the loop driver. Bart Van Assche (2): blk-mq: Introduce the BLK_MQ_F_NO_SCHED_BY_DEFAULT flag loop: Select I/O scheduler 'none' from inside add_disk() block/elevator.c | 3 +++ drivers/block/loop.c | 3 ++- include/linux/blk-mq.h | 6 ++++++ 3 files changed, 11 insertions(+), 1 deletion(-)