From: Miroslav Lichvar <mlichvar@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
linux-kernel@vger.kernel.org,
John Stultz <john.stultz@linaro.org>,
Prarit Bhargava <prarit@redhat.com>
Subject: Re: [PATCH] rtc: adapt allowed RTC update error
Date: Wed, 2 Dec 2020 16:07:25 +0100 [thread overview]
Message-ID: <20201202150725.GA2231584@localhost> (raw)
In-Reply-To: <87mtywe2zu.fsf@nanos.tec.linutronix.de>
On Wed, Dec 02, 2020 at 02:44:53PM +0100, Thomas Gleixner wrote:
> Something like the completely untested below should make this reliable
> and only needs to retry when the work is running late (busy machine),
> but the wakeup will be on time or at max 1 jiffie off when high
> resolution timers are not available or disabled.
It seems to work nicely. In my test most of the updates succeeded on
the first attempt hitting the right tick, the rest succeeding on the
second attempt. Only when the clock was set to run 10% faster, it
needed few more attempts to converge to the target time.
Thanks,
--
Miroslav Lichvar
next prev parent reply other threads:[~2020-12-02 15:09 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 14:38 [PATCH] rtc: adapt allowed RTC update error Miroslav Lichvar
2020-12-01 16:12 ` Jason Gunthorpe
2020-12-01 17:14 ` Miroslav Lichvar
2020-12-01 17:35 ` Jason Gunthorpe
2020-12-02 10:01 ` [PATCHv2] " Miroslav Lichvar
2020-12-02 13:44 ` [PATCH] " Thomas Gleixner
2020-12-02 15:07 ` Miroslav Lichvar [this message]
2020-12-02 15:36 ` Miroslav Lichvar
2020-12-02 18:36 ` Thomas Gleixner
2020-12-02 16:27 ` Jason Gunthorpe
2020-12-02 19:21 ` Thomas Gleixner
2020-12-02 20:54 ` Jason Gunthorpe
2020-12-02 22:08 ` Thomas Gleixner
2020-12-02 23:03 ` Jason Gunthorpe
2020-12-03 1:14 ` Thomas Gleixner
2020-12-03 2:04 ` Jason Gunthorpe
2020-12-03 2:10 ` Alexandre Belloni
2020-12-03 15:39 ` Thomas Gleixner
2020-12-03 16:16 ` Jason Gunthorpe
2020-12-03 21:05 ` Thomas Gleixner
2020-12-03 21:31 ` Thomas Gleixner
2020-12-03 22:36 ` Jason Gunthorpe
2020-12-04 13:02 ` Thomas Gleixner
2020-12-04 14:08 ` Jason Gunthorpe
2020-12-04 14:37 ` Alexandre Belloni
2020-12-04 14:46 ` Jason Gunthorpe
2020-12-04 15:08 ` Alexandre Belloni
2020-12-04 15:57 ` Jason Gunthorpe
2020-12-04 16:35 ` Alexandre Belloni
2020-12-03 22:00 ` Alexandre Belloni
2020-12-04 9:34 ` Thomas Gleixner
2020-12-04 9:51 ` Alexandre Belloni
2020-12-04 10:44 ` Thomas Gleixner
2020-12-03 17:29 ` Alexandre Belloni
2020-12-03 19:52 ` Thomas Gleixner
2020-12-03 15:52 ` Jason Gunthorpe
2020-12-03 16:07 ` Alexandre Belloni
2020-12-03 20:10 ` Jason Gunthorpe
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