From: boris.brezillon@free-electrons.com (Boris Brezillon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v1] clocksource: atmel-pit: register as a sched_clock
Date: Mon, 8 Feb 2016 15:06:14 +0100 [thread overview]
Message-ID: <20160208150614.5e87133e@bbrezillon> (raw)
In-Reply-To: <56B89910.3060305@linaro.org>
+ Alexandre
Hi Daniel,
On Mon, 8 Feb 2016 14:33:04 +0100
Daniel Lezcano <daniel.lezcano@linaro.org> wrote:
> On 02/04/2016 06:21 PM, Romain Izard wrote:
> > Register the counter of the Periodic Interval Timer as a possible source
> > for sched_clock. This provides a better precision than the jiffies-based
> > default.
> >
> > Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
>
> Nicolas, Boris,
>
> Are you ok with this patch ?
Not sure yet :). On most platforms we are also declaring a clocksource
based on the TCB IP, and this one provides a better precision than the
PIT clocksource.
What happens if the PIT is de-activated while it's still supposed to
provide the sched_clock(). Is there a way to flag the clocksource as
still needed so that the core does not shut it down by when the TCB
clocksource comes in.
Best Regards,
Boris
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
prev parent reply other threads:[~2016-02-08 14:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-04 17:21 [PATCH v1] clocksource: atmel-pit: register as a sched_clock Romain Izard
2016-02-08 13:33 ` Daniel Lezcano
2016-02-08 14:06 ` Boris Brezillon [this message]
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