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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 666E1C76195 for ; Thu, 18 Jul 2019 07:06:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 405B721019 for ; Thu, 18 Jul 2019 07:06:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="dVGH0KxN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727496AbfGRHGq (ORCPT ); Thu, 18 Jul 2019 03:06:46 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:46670 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726472AbfGRHGq (ORCPT ); Thu, 18 Jul 2019 03:06:46 -0400 Received: by mail-wr1-f65.google.com with SMTP id z1so27360551wru.13 for ; Thu, 18 Jul 2019 00:06:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=AjHCbwBrWhsfLtVDroYK4H9JzJ/y/JeFj0V80CAWrXw=; b=dVGH0KxN6IWsqILmypdJN4ffQoCPa2LdoyifWahZfeHOoPNHQTGt8fE1xe1MSWS4uw 3z3/+hqTViU1WPFnk1rbvI7YmuGNFFkVwWP7zYDAZitxcvVUbuAIgRCGyAuOdFr3yGAu +Vetkcpm6wt7w5dxfjzV17UX6+KSHP4fzyLXXAnbzy4Cw4373BJ9cpVsww8NC1RX7NkW sLqz8+Sw3+jMGZUgDk7gV3VD3Kf2vOPwHMdldJUW6DdNxMdiQQX1jymVRkBA7LkBxmr+ GU2jr6+/K0OPFYMXdYBlqYv+PesxCApS2onGI5eDrig3q7k+29ISZmzIwTJYaaD/dTHC DZPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=AjHCbwBrWhsfLtVDroYK4H9JzJ/y/JeFj0V80CAWrXw=; b=V+HppMC8hUNDveU3TEWQS/OqD7lBRKTrv9bGsf3lv9pZwvLBpdOBVhvxS14NnaVRVq bL3CZUoJvpzTdJTeRIafNobdWz7WzG179Ru6FWpEQCVRHa8j0HZTo/GqDoYwafwpieif Vg3ZDhA3TOpEfBptIjqghKSJKo2HjK3i3ShrxBwMdLTBUj3hUT2AIPxt/0sL02b2YPpy KqTjJDLocLnNAQv95Qg7ZFmEOUKE5IOvqKU4pIyBld6NlXndsmgilayubUK6x6KcR5M/ 5C2W9fki2lGozNuN8z/IuVsUoGiwb4w0x2n7NY95pEyzkmvclckvRBu5UwegGi3m60J4 27nA== X-Gm-Message-State: APjAAAX+5o0HNKYhsyw2iUDiVBPlh+WylHTLdFzSFU5MTlmMzQlOh5Bk fEpKjsB+tSCFc3jAF9UwHURV6w== X-Google-Smtp-Source: APXvYqwZgraIaMNlL/RuU9cyBFJWX9VGmgZznSLju1U+tv3DN8TEIZD+AhpTERo3x4as2ww2RMcmGA== X-Received: by 2002:a5d:63c8:: with SMTP id c8mr5109243wrw.21.1563433603713; Thu, 18 Jul 2019 00:06:43 -0700 (PDT) Received: from [192.168.0.100] (146-241-85-178.dyn.eolo.it. [146.241.85.178]) by smtp.gmail.com with ESMTPSA id i18sm31923341wrp.91.2019.07.18.00.06.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 18 Jul 2019 00:06:43 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Subject: Re: [PATCH BUGFIX IMPROVEMENT V2 0/1] block, bfq: eliminate latency regression with fast drives From: Paolo Valente In-Reply-To: <6867cf11-d7f8-cadf-b9ec-85549bb86af3@kernel.dk> Date: Thu, 18 Jul 2019 09:06:41 +0200 Cc: linux-block , linux-kernel@vger.kernel.org, ulf.hansson@linaro.org, linus.walleij@linaro.org, bfq-iosched@googlegroups.com, oleksandr@natalenko.name Content-Transfer-Encoding: quoted-printable Message-Id: <12B115BF-AF31-44F8-9A3A-EC64D3284FBB@linaro.org> References: <20190715105719.20353-1-paolo.valente@linaro.org> <6867cf11-d7f8-cadf-b9ec-85549bb86af3@kernel.dk> To: Jens Axboe X-Mailer: Apple Mail (2.3445.104.8) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Il giorno 16 lug 2019, alle ore 16:11, Jens Axboe ha = scritto: >=20 > On 7/15/19 4:57 AM, Paolo Valente wrote: >> [V2 that should apply cleanly on current HEAD] >>=20 >> 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. >>=20 >> I do hope that, after proper review, this commit makes it for 5.3. >=20 > If it's a regression, it should have a Fixes: line telling us which > commit originally introduced the regression. This is important for > folks doing backports. Right, sorry. > Can you add that? >=20 Added, together with an explanation of why the fixed commit fails. Sending a V3. Thanks, Paolo > --=20 > Jens Axboe >=20