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: 169191 Delivered-To: patch@linaro.org Received: by 2002:a92:4782:0:0:0:0:0 with SMTP id e2csp2011626ilk; Thu, 18 Jul 2019 00:09:11 -0700 (PDT) X-Google-Smtp-Source: APXvYqxg36aTL88j1XziyHLPvElxDSuqWFaxgZ6qfI/5Wvg4JQ8B6Mlbj9MXI5vD6T0Oj/XUY2ht X-Received: by 2002:a17:902:d892:: with SMTP id b18mr45198316plz.165.1563433750986; Thu, 18 Jul 2019 00:09:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563433750; cv=none; d=google.com; s=arc-20160816; b=Y5y90P4qXqIQfSR6s63zF49+kttioyMD8MTR3Y9JREElcmqwH5ZAmAVM7nJxlBqlDF wZNZmxCa3uV97FdX6Wzyi8DG2YXjEzvedWP7sLZ1TDxb6zomYe4y3rQoTJBJEiUiHjju GnNYvuIRSOfrU3PwgJXwpGTG8eMY2TOYnHGyFKD9Ar86X5Que02XHHUZoPwngUBhxPer Uppbok01EOfBhGsyO+tpqPbVmzJqRBrbbXtvjCFsskZJz29H0ymGdth91LkbNqhq/US3 KusK/si5EyY00NBv0DWvmB2SL5B0K04O9k6DF9PmssE/Qx7ITrXBFYbmV2KdMPiEkfHs DGEg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from:dkim-signature; bh=GG/8zjsGwI0huheQ1dD8J/Pm1m5zJ9oP8/IXUD2TeEQ=; b=lKlHGyqEVr3eTq86gzC5L6PisGdNdifFdcrRzqJX5pSD/N67jEFHSSjNkZYylvdk+/ 3qz05PeIKZK0KcoKwjcXHvYTnS1C+vkc6BDeCSbmmsi0xh6BI/b7ETG/ZjdDvfUACXeI 57m6PKq35toPNlWdoVtuqCtWMYpgy0dFeyO8owYxqsdYswZa6VS3FzjO3xCs5FAnW4vZ KglFozhTIT3DZYcgQqfpMaSwHA6/Im8tYrDTwQ87Yc8cw9W9bwwppu/Z5Y2+lsLyOxQN w+T6G3McX02AzeUFieuRpuaTZBP5mb73JNTc1vqKPQXWbmmQZF3+zPNc5RrJKXaQvPff 7VNw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="F2PZ8u/l"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f9si1467596pgg.450.2019.07.18.00.09.10; Thu, 18 Jul 2019 00:09:10 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="F2PZ8u/l"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388143AbfGRHJJ (ORCPT + 29 others); Thu, 18 Jul 2019 03:09:09 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:40412 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726383AbfGRHJJ (ORCPT ); Thu, 18 Jul 2019 03:09:09 -0400 Received: by mail-wr1-f66.google.com with SMTP id r1so27390428wrl.7 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=MHcN6EHrSyWzvNxS0VYh7DNz82E728i7yBSjJdBuRkJhhLuwp4uNLQ65qQDwQYSmMe 1TOrFIMO8bgqWA8I1Ikuv8hI2ulnowMGz1pB/9G43uAdEtDHfGwXue8X0TEgg44xY8ev pqhPxvXWyZO1KV87MQhmQHarEqQLji+ounkS86CwFTgbEt5FTS/QE+jPf6KnbU3wmXhd 61wt2gN0FsIoUysV2hdMHLw83Lewr8VRnqfBY5nxTHfhkLY8FW9k8p8+c4wa9RZJrY9Z 6QJzujUdp0LoA7zq2asIF4P2UORTFJAxzXjUURRyzaoKSM3/BYoMwOhFXM+rxmMZGF4V 3Rxg== X-Gm-Message-State: APjAAAV31B8mt93y+sweTA9Pvbqu5+S0LXCS+93J6w93+qriO99hAmHa lDPUBgvbZCbtOzuHmsqm8PePvA== 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-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [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