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From: Linus Torvalds <torvalds@linux-foundation.org>
To: lkp report check <rong.a.chen@intel.com>
Cc: David Howells <dhowells@redhat.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Nicolas Dichtel <nicolas.dichtel@6wind.com>,
	raven@themaw.net, Christian Brauner <christian@brauner.io>,
	keyrings@vger.kernel.org, linux-usb@vger.kernel.org,
	linux-block <linux-block@vger.kernel.org>,
	LSM List <linux-security-module@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	lkp@lists.01.org
Subject: Re: [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement
Date: Thu, 7 Nov 2019 08:51:50 -0800
Message-ID: <CAHk-=wiJ+jaT5Ev-wCg7iGNNO_JFUyMDcat0KDdA2b_+n_cZCQ@mail.gmail.com> (raw)
In-Reply-To: <20191107090306.GV29418@shao2-debian>

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

  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-01 17:34 [RFC PATCH 00/11] pipe: Notification queue preparation [ver #3] David Howells
2019-11-01 17:34 ` [RFC PATCH 01/11] pipe: Reduce #inclusion of pipe_fs_i.h " David Howells
2019-11-01 17:34 ` [RFC PATCH 02/11] Remove the nr_exclusive argument from __wake_up_sync_key() " David Howells
2019-11-01 17:34 ` [RFC PATCH 03/11] Add wake_up_interruptible_sync_poll_locked() " David Howells
2019-11-01 17:34 ` [RFC PATCH 04/11] pipe: Use head and tail pointers for the ring, not cursor and length " David Howells
     [not found]   ` <20191107090306.GV29418@shao2-debian>
2019-11-07 16:51     ` Linus Torvalds [this message]
2019-11-07 17:42     ` [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement David Howells
2019-11-01 17:34 ` [RFC PATCH 05/11] pipe: Allow pipes to have kernel-reserved slots [ver #3] David Howells
2019-11-01 17:34 ` [RFC PATCH 06/11] pipe: Advance tail pointer inside of wait spinlock in pipe_read() " David Howells
2019-11-01 17:35 ` [RFC PATCH 07/11] pipe: Conditionalise wakeup " David Howells
2019-11-01 17:35 ` [RFC PATCH 08/11] pipe: Rearrange sequence in pipe_write() to preallocate slot " David Howells
2019-11-01 17:35 ` [RFC PATCH 09/11] pipe: Remove redundant wakeup from pipe_write() " David Howells
2019-11-01 17:35 ` [RFC PATCH 10/11] pipe: Check for ring full inside of the spinlock in " David Howells
2019-11-01 17:35 ` [RFC PATCH 11/11] pipe: Increase the writer-wakeup threshold to reduce context-switch count " David Howells
2019-11-01 19:24 ` [RFC PATCH 00/11] pipe: Notification queue preparation " Linus Torvalds
2019-11-01 22:05 ` David Howells
2019-11-01 22:12   ` Linus Torvalds
2019-11-05 16:02 ` Details on the UAPI of implementing notifications on pipes David Howells

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