linux-kernel - Re: [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity

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Date:   Thu, 7 Nov 2019 08:51:50 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     lkp report check <rong.a.chen@...el.com>
Cc:     David Howells <dhowells@...hat.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>, raven@...maw.net,
        Christian Brauner <christian@...uner.io>,
        keyrings@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-block <linux-block@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org
Subject: Re: [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level
 144.0% improvement

On Thu, Nov 7, 2019 at 1:03 AM lkp report check <rong.a.chen@...el.com> 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