From: Thomas Gleixner <tglx@linutronix.de>
To: Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
Frederic Weisbecker <frederic@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Anna-Maria Behnsen <anna-maria@linutronix.de>
Cc: linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Anna-Maria Behnsen <anna-maria@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
damon@lists.linux.dev, linux-mm@kvack.org,
SeongJae Park <sj@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org,
Heiner Kallweit <hkallweit1@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Andy Whitcroft <apw@canonical.com>, Joe Perches <joe@perches.com>,
Dwaipayan Ray <dwaipayanray1@gmail.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
netdev@vger.kernel.org, linux-sound@vger.kernel.org,
Michael Ellerman <mpe@ellerman.id.au>,
Nathan Lynch <nathanl@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-media@vger.kernel.org
Subject: Re: [PATCH v2 00/15] timers: Cleanup delay/sleep related mess
Date: Wed, 02 Oct 2024 17:02:00 +0200 [thread overview]
Message-ID: <87ttduwntj.ffs@tglx> (raw)
In-Reply-To: <c794b4a6-468d-4552-a6d6-8185f49339d3@wanadoo.fr>
On Mon, Sep 16 2024 at 22:20, Christophe JAILLET wrote:
> Le 11/09/2024 à 07:13, Anna-Maria Behnsen a écrit :
>
> not directly related to your serie, but some time ago I sent a patch to
> micro-optimize Optimize usleep_range(). (See [1])
>
> The idea is that the 2 parameters of usleep_range() are usually
> constants and some code reordering could easily let the compiler compute
> a few things at compilation time.
>
> There was consensus on the value of the change (see [2]), but as you are
> touching things here, maybe it makes sense now to save a few cycles at
> runtime and a few bytes of code?
For the price of yet another ugly interface and pushing the
multiplication into the non-constant call sites.
Seriously usleep() is not a hotpath operation and the multiplication is
not even measurable except in micro benchmarks.
Thanks,
tglx
prev parent reply other threads:[~2024-10-02 15:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-11 5:13 [PATCH v2 00/15] timers: Cleanup delay/sleep related mess Anna-Maria Behnsen
2024-09-11 5:13 ` [PATCH v2 05/15] timers: Update function descriptions of sleep/delay related functions Anna-Maria Behnsen
2024-10-06 21:49 ` Frederic Weisbecker
2024-10-10 8:45 ` Anna-Maria Behnsen
2024-10-10 12:36 ` Frederic Weisbecker
2024-10-11 10:20 ` Anna-Maria Behnsen
2024-10-11 12:22 ` Frederic Weisbecker
2024-09-16 20:20 ` [PATCH v2 00/15] timers: Cleanup delay/sleep related mess Christophe JAILLET
2024-09-17 5:22 ` Christophe JAILLET
2024-09-23 15:12 ` Anna-Maria Behnsen
2024-10-02 15:02 ` Thomas Gleixner [this message]
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