From patchwork Mon Jul 15 10:57:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Valente X-Patchwork-Id: 11043591 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1014913BD for ; Mon, 15 Jul 2019 10:57:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F2B29283AD for ; Mon, 15 Jul 2019 10:57:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E6C4A283BB; Mon, 15 Jul 2019 10:57:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B3D7283AD for ; Mon, 15 Jul 2019 10:57:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729747AbfGOK5f (ORCPT ); Mon, 15 Jul 2019 06:57:35 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:36506 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729544AbfGOK5f (ORCPT ); Mon, 15 Jul 2019 06:57:35 -0400 Received: by mail-wm1-f67.google.com with SMTP id g67so10601871wme.1 for ; Mon, 15 Jul 2019 03:57:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Ub5f0na4GPQpBSoQ+OsF8cwS68edtFbv7d8hORSDg9A=; b=FS3TKK/EpKKg26Wo24BT/Zuph86L0wK1B/lZJrIUDXTw8HESm8Q+LV0kFzmUVjKouF uIw26FmHjPsGtUNodNQCJWaC4r/3+37YM+e9FK1Et5mse3UqoZAYVWNLRv27VQnExHyC YCcQzIuIEde34+2IZwoHMtbIxjEbnSDfRFj0kYtAeWR3ub3pmbLx07WsiZ+qxq3rnUGo 9PwascXPJ2/jRYYLO/v7OmVnTc+kxRLH8KyA1/YLmkipq7KCULeyggQwBzuMpnie3D3D 0ajzxpE/CNJ6I19/XQzx9sEGqnVrVsSBdqP3c+AzP7B1egbr40syjjc1JanLB2+bfXn+ uSvg== 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=Ub5f0na4GPQpBSoQ+OsF8cwS68edtFbv7d8hORSDg9A=; b=eAhk1QP6jmYRmRNxoPgObL138GLlZJQuF0wff+sFt2v5aEKj0xibDhlGIiwzDT8CEl pfmyyeOw6oTuPMz978nGJ8dm2qMM9t72D/xCEQirgaDj4ajkw2BQXwL6MMunAvMNqTSo UfwL1VBhLp3MOvUHuAPk2iK6aT1InITIMwmiQQzNCv/p4d0hA0oLX3u/izrdUKRfz+DJ 2PhXwNEGApWRbVF/kjVRlwFG7k5kMhLu/a/a2oQY1o+fPRcgIP0fZm/vSsr3TaYXskHI rPKssp6b4LodVxb2811URJjr/IfeC6CXFq/iavxhUxguKKH/d9WbQ0KuPJhXT23VSlI3 lwxg== X-Gm-Message-State: APjAAAXOC/nN9L6Yogkp0jqZmsDfLGZEO/FoVLLh7g800Kqq/1xHsHfz uE/FeSyadgyrsje/zUvJDFdIqNbXApg= X-Google-Smtp-Source: APXvYqxROvFKewgTDbtvwvjbknUcifi1+bsHFs74Pa8CbcOdOCg4b7cq7uPAKkq7GDP2KQk7rfkiqA== X-Received: by 2002:a05:600c:228f:: with SMTP id 15mr22539235wmf.60.1563188253569; Mon, 15 Jul 2019 03:57:33 -0700 (PDT) Received: from localhost.localdomain (146-241-97-230.dyn.eolo.it. [146.241.97.230]) by smtp.gmail.com with ESMTPSA id z1sm18186559wrv.90.2019.07.15.03.57.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Jul 2019 03:57:33 -0700 (PDT) From: Paolo Valente To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ulf.hansson@linaro.org, linus.walleij@linaro.org, bfq-iosched@googlegroups.com, oleksandr@natalenko.name, Paolo Valente Subject: [PATCH BUGFIX IMPROVEMENT V2 0/1] block, bfq: eliminate latency regression with fast drives Date: Mon, 15 Jul 2019 12:57:18 +0200 Message-Id: <20190715105719.20353-1-paolo.valente@linaro.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP [V2 that should apply cleanly on current HEAD] Hi Jens, I've spotted a regression on a fast SSD: a loss of I/O-latency control with interactive tasks (such as the application start up I usually test). Details in the commit. I do hope that, after proper review, this commit makes it for 5.3. Thanks, Paolo Paolo Valente (1): block, bfq: check also in-flight I/O in dispatch plugging block/bfq-iosched.c | 67 +++++++++++++++++++++++++++++---------------- 1 file changed, 43 insertions(+), 24 deletions(-) --- 2.20.1