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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 AB0A0C43331 for ; Thu, 7 Nov 2019 16:57:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D2202077C for ; Thu, 7 Nov 2019 16:57:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573145847; bh=Z1dqk+RRh5Tw9vIdgN632bDR4HOjWiROuyE5KZkrIOc=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=mK3X5U0R7rIO04g82JfGvvAUmuxgfXkv/TYpIZDkV555yuSI9XtmOQCM2wuu15ogv Ngxg9Laj2fpRX+h8IoI1dEEc9xWPC+8SMh46pEtIebrLnV5SPQzlBn+5y+itFSu8w7 AkRImiswV2oq4JyY64ZfL8xTdGb6a/ZHJDqjZLYU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729451AbfKGQ51 (ORCPT ); Thu, 7 Nov 2019 11:57:27 -0500 Received: from mail-lj1-f194.google.com ([209.85.208.194]:40628 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726877AbfKGQ50 (ORCPT ); Thu, 7 Nov 2019 11:57:26 -0500 Received: by mail-lj1-f194.google.com with SMTP id q2so3071780ljg.7 for ; Thu, 07 Nov 2019 08:57:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=QmbLva0bcejWfZ5vroXCCCNjtDh9+KzeuzRfAkUcNVw=; b=RC+2jxnet1c9HEhXNBxtTTpEfLinckdbFJn5Bmrik3m/W7Num2OjpLxTQS23AoRNRr Aj4dYDnclnksK9me7oG5iyDsfchGPA4TwVOyMbOGN2PJFpJroPg+VNW7luk63nWV0aoz X/nFl5ue/aQhw5K+6Ogz8TNi8yWG86H2/HKz4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=QmbLva0bcejWfZ5vroXCCCNjtDh9+KzeuzRfAkUcNVw=; b=JoEnyccTo/UwT/B2ohS+SnctWAStxR6kCZdyDae7gJdJ394I1ZsVDYHT8c8CPheNbI tG7ZiaywZ3PCKTYu+Lil2SpgsFW7SQAqpw1W7wNVjHMvD3v9nfQTSw+jZjsYXX89ahBr ZJrSovvPmW9+szlqEm/BQVFBYWXulOZztXC2CVAZTA+51n4e/Mj51pDlR/gyOgbIkZAV QieUfBn5y04WjLknhdPWKxtWgzm/qsGiWeTWvkVpm4vHD7P6fWeYzRbKcb1P2rek2Z8+ ViG5az9SSFd4xsCW666wimoux7TSL7tztkrkowBAnlTQEGY/oVA7upvWC50qKAtokAp9 16eA== X-Gm-Message-State: APjAAAVlWNSxI1f+4wcAOXOPaDYNnqVRDJh+Pq3Z7PN4abyhFac4zIUR 6rQujZ4cc6mkt6Re+/qtVw6eU/10dTU= X-Google-Smtp-Source: APXvYqxRf7A6wQjZNEGy23NxMmI8B+MF82GhrIQfWK2xZtXOMUzMvod3I1Y2RGAbByxPPIefN/te8g== X-Received: by 2002:a2e:28a:: with SMTP id y10mr3246947lje.155.1573145844144; Thu, 07 Nov 2019 08:57:24 -0800 (PST) Received: from mail-lf1-f53.google.com (mail-lf1-f53.google.com. [209.85.167.53]) by smtp.gmail.com with ESMTPSA id u14sm1169856lfk.47.2019.11.07.08.57.23 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 Nov 2019 08:57:23 -0800 (PST) Received: by mail-lf1-f53.google.com with SMTP id m6so2157400lfl.3 for ; Thu, 07 Nov 2019 08:57:23 -0800 (PST) X-Received: by 2002:ac2:5bca:: with SMTP id u10mr3159115lfn.134.1573145526683; Thu, 07 Nov 2019 08:52:06 -0800 (PST) MIME-Version: 1.0 References: <157262967752.13142.696874122947836210.stgit@warthog.procyon.org.uk> <20191107090306.GV29418@shao2-debian> In-Reply-To: <20191107090306.GV29418@shao2-debian> From: Linus Torvalds Date: Thu, 7 Nov 2019 08:51:50 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement To: lkp report check Cc: David Howells , Rasmus Villemoes , Greg Kroah-Hartman , Peter Zijlstra , Nicolas Dichtel , raven@themaw.net, Christian Brauner , keyrings@vger.kernel.org, linux-usb@vger.kernel.org, linux-block , LSM List , linux-fsdevel , Linux API , Linux Kernel Mailing List , lkp@lists.01.org Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On Thu, Nov 7, 2019 at 1:03 AM lkp report check wrote: > > FYI, we noticed a 144.0% improvement of phoronix-test-suite.noise-level.0.activity_level due to commit: > > commit: d60337eff18a3c587832ab8053a567f1da9710d2 ("[RFC PATCH 04/11] pipe: Use head and tail pointers for the ring, not cursor and length [ver #3]") That sounds nice, but is odd. That commit really shouldn't change anything noticeable. David, any idea? Linus