From patchwork Thu Jul 18 07:08:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Valente X-Patchwork-Id: 11048597 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 BDF176C5 for ; Thu, 18 Jul 2019 07:09:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AD164285A8 for ; Thu, 18 Jul 2019 07:09:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A093F287A5; Thu, 18 Jul 2019 07:09:12 +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 3AB5D285A8 for ; Thu, 18 Jul 2019 07:09:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726383AbfGRHJK (ORCPT ); Thu, 18 Jul 2019 03:09:10 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:41897 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726538AbfGRHJJ (ORCPT ); Thu, 18 Jul 2019 03:09:09 -0400 Received: by mail-wr1-f68.google.com with SMTP id c2so24199254wrm.8 for ; Thu, 18 Jul 2019 00:09:07 -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=GG/8zjsGwI0huheQ1dD8J/Pm1m5zJ9oP8/IXUD2TeEQ=; b=F2PZ8u/l3YIVkv1D6ehmIez5F4a2WimbKNbD1TdUxKEO9fs5XnjICg+eXO5fmngWTO 6ygGEFomVV25RQUctGSQ7weqiHfmjyWkFwlG4j1tNrcXqdqOcbGc9xWJvJZfdNlw27rW X9n3ZNwuFdOD8qd13/S9t7JnsDlbaw02irLulivhnSHUmGM79Og9C6Dy2NjPS/YH1EKA vj67JWkUifzCwJj408axKnAOpFteMASKS8YWz+P+ODg2eFElHm74U6qFmqojLlj9aSWL o4kWxtpv++swn/dfJ+P5m9h4B+nilNwrVMKbGQv8KqPw3cJbRAuLHSS3Jt8f66tWxjH7 VvUQ== 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=GG/8zjsGwI0huheQ1dD8J/Pm1m5zJ9oP8/IXUD2TeEQ=; b=NH/ZNQa5jhJIHj10tDtC/wPFdRZKjOYlxur6OHmvb2JTfHW1pS7ykqGEvv2SXw1NDy RAUxA83OCjDqh2FlHqteOx3p0DBwWsK9UJZkhmKoG1P3dnhQKMy9cLdly5Uj+w1dHA/+ 9bGvdm+uT8cV17dCfXrSE+vMLspGBSdLWdzqcWK1YOZC5b4g5ok4Gi1tsSTpBl4T4Gi6 9jelMt9u5lUFSGzNUjwxt0bQJX9yEk01sw7z0s2p+Nbd4/WESRiXb+w2yNb16GoW9T1h IK/ouCInDhmTnZ83gfr4hHnvbXNpnTrEPNpvXQ+sOe6Vh6i84DwJGb8zGvlIzOXtNLY3 yHOg== X-Gm-Message-State: APjAAAVJ5Zn55uGcBUqsRiwKXb93Sq3QudqEb9zro+MMwImxejAN6V5p ZcOE2boKxHITRNjOLNH5kObjgQ== X-Google-Smtp-Source: APXvYqwFxi6I6lXXJDPgdJgauNEokbYo682URYuPkZ4F5UMpskKYb5wZTE9J+W5sDeiHZhDhFNwAvw== X-Received: by 2002:adf:da4d:: with SMTP id r13mr14732286wrl.281.1563433747231; Thu, 18 Jul 2019 00:09:07 -0700 (PDT) Received: from localhost.localdomain (146-241-85-178.dyn.eolo.it. [146.241.85.178]) by smtp.gmail.com with ESMTPSA id a64sm26629527wmf.1.2019.07.18.00.09.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 18 Jul 2019 00:09:06 -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, bottura.nicola95@gmail.com, srivatsa@csail.mit.edu, Paolo Valente Subject: [PATCH BUGFIX IMPROVEMENT V3 0/1] block, bfq: eliminate latency regression with fast drives Date: Thu, 18 Jul 2019 09:08:51 +0200 Message-Id: <20190718070852.34568-1-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 [V3 that mentions the fixed/improved commit] 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