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[209.132.180.67]) by mx.google.com with ESMTP id x2-v6si37089pfn.315.2018.05.31.07.58.08; Thu, 31 May 2018 07:58:23 -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=@kernel-dk.20150623.gappssmtp.com header.s=20150623 header.b=A+JTaX2n; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755367AbeEaO4M (ORCPT + 99 others); Thu, 31 May 2018 10:56:12 -0400 Received: from mail-io0-f196.google.com ([209.85.223.196]:34250 "EHLO mail-io0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755134AbeEaO4H (ORCPT ); Thu, 31 May 2018 10:56:07 -0400 Received: by mail-io0-f196.google.com with SMTP id e15-v6so17721249iog.1 for ; Thu, 31 May 2018 07:56:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=zTp+Z4Lm/4OzIiwn4Cz+Hcabq56kcAUywuuk4prp5fM=; b=A+JTaX2nC9TA2yiZIfL1Ji/DrCjLe8n78+Qe6iqbem26MrcWNbd9tjmSKagxRTTlO5 HbxtauDY2i9tEKqbH3a7GBh+XWUlEXnL+FWgFv0q2lUGDuXg+giqBKwabYUT1625jcMj rZrrEPaU4/ib8s43+d77Emr2sG4NpJsyiNh6uQheUC4mbLwAFdP5MXqiDSk4GCk4UfZl DwuG0qXQZNZiSY91jIGS5kPCB0fMJB4HXWjI0JdFhhYhmPIb08xhZAiqPAdJIgYAerCo oVm87KtpgCltm25e6asmrlTBApPcRNH/73cgLOocmvWQmoLgAv0NYNVQfWYC1q/TEnlx zCQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=zTp+Z4Lm/4OzIiwn4Cz+Hcabq56kcAUywuuk4prp5fM=; b=MT5qi1drXlqirYEFp4R5K6oAYzV3g9qAi4Ddf7xpLB34nFIEqksx8Nl/LmWw8LwOdu khFaG1zid6d3ROO4PejAY0OjJEI6VH+Sv/Ej6GRUHMRrvMUbXaHkMlmY3xV6vSwI3J8R 55qjcQ7cra64YIxJUbdb617gRh5bH2yi51TfbFdrze12g2tVjkRrpgEtb+3BGNK69Jdi l4U1U2HHXvWYLRUmVxDSV+StjMBGnaoTlorAAO6SLFaXjqo03fLnABphb4+5VMrpxCRl es5SmjSi49T2M1WWB/BGP5IcqlapSHk054AHWvmntX7AhvasQCnW5fPa6CAUmRv0kZiW UmGA== X-Gm-Message-State: APt69E0tlUNcKjTVDUoXhvEdV7r3MQItLxBRVY0ALehUXsePisrSXeIL mzUqEZLjGonJJkn6x8S9hdROAw== X-Received: by 2002:a6b:cc02:: with SMTP id c2-v6mr6586370iog.304.1527778566943; Thu, 31 May 2018 07:56:06 -0700 (PDT) Received: from [192.168.1.168] ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id 198-v6sm306200itz.5.2018.05.31.07.56.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 31 May 2018 07:56:05 -0700 (PDT) Subject: Re: [PATCH BUGFIX/IMPROVEMENTS 0/4] bfq: fix regressions on slow virtual machines To: Paolo Valente Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ulf.hansson@linaro.org, broonie@kernel.org, linus.walleij@linaro.org, bfq-iosched@googlegroups.com, oleksandr@natalenko.name, sapienza.dav@gmail.com, 177992@studenti.unimore.it References: <20180531144508.3927-1-paolo.valente@linaro.org> From: Jens Axboe Message-ID: <2e19f92d-5319-f023-7f4c-89ee81c58348@kernel.dk> Date: Thu, 31 May 2018 08:56:04 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <20180531144508.3927-1-paolo.valente@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/31/18 8:45 AM, Paolo Valente wrote: > Hi, > we have bumped into some BFQ latency regressions on slow virtual > machines. The patches in this series fix all these regressions, apart > from the first patch, which provides an indirect contribution, by > improving the description of the mechanisms affected by these > regressions. Pulled for 4.18, thanks Paolo. -- Jens Axboe