From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards.
Date: Thu, 20 Oct 2005 08:56:20 +0200 [thread overview]
Message-ID: <20051020065620.GA27349@elte.hu> (raw)
In-Reply-To: <Pine.LNX.4.58.0510200221200.27683@localhost.localdomain>
* Steven Rostedt <rostedt@goodmis.org> wrote:
> > should be monotone - the latest -rt kernels include a debugging check
> > for the monotonicity of do_get_ktime_mono().
>
> Hi Ingo,
>
> Hmm, I think this will help in that debugging check :-)
> + per_cpu(prev_mono_time, cpu) = now;
> return now;
> }
*blush*, applied.
I was already wondering a bit why that check never triggered for anyone.
It is easy to have a non-monotonic clock (there's lots of crappy hw and
the gettimeofday code has to work hard) and the effects of time warps
are subtle, if noticeable at all, so i expected some detections.
i have released -rt13 with another change: the other timer warning is
only printed once. (a steady stream of messages is not helpful)
Ingo
next prev parent reply other threads:[~2005-10-20 6:55 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-19 14:59 Ktimer / -rt9 (+custom) monotonic_clock going backwards Steven Rostedt
2005-10-19 15:10 ` Thomas Gleixner
2005-10-19 18:39 ` john stultz
2005-10-20 6:55 ` Steven Rostedt
2005-10-20 7:34 ` Ingo Molnar
2005-10-20 7:46 ` Steven Rostedt
2005-10-20 8:01 ` Ingo Molnar
2005-10-20 8:56 ` Steven Rostedt
2005-10-20 8:59 ` Ingo Molnar
2005-10-20 9:04 ` Steven Rostedt
2005-10-20 9:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 15:55 ` Ingo Molnar
2005-10-20 16:09 ` Steven Rostedt
2005-10-20 16:45 ` john stultz
2005-10-20 16:58 ` Steven Rostedt
2005-10-20 17:05 ` john stultz
2005-10-20 19:32 ` Ingo Molnar
2005-10-20 20:05 ` john stultz
2005-10-20 20:54 ` Ingo Molnar
2005-10-21 6:03 ` Steven Rostedt
2005-10-21 7:49 ` Thomas Gleixner
2005-10-21 7:57 ` Steven Rostedt
2005-10-21 8:00 ` ktimer API Steven Rostedt
2005-10-21 8:09 ` Thomas Gleixner
2005-10-21 18:09 ` Ktimer / -rt9 (+custom) monotonic_clock going backwards john stultz
2005-10-21 18:15 ` Thomas Gleixner
2005-10-20 22:06 ` George Anzinger
2005-10-20 6:19 ` Steven Rostedt
2005-10-20 14:34 ` Steven Rostedt
2005-10-20 15:18 ` Steven Rostedt
2005-10-20 15:23 ` Steven Rostedt
2005-10-20 16:01 ` Steven Rostedt
2005-10-19 15:11 ` Ingo Molnar
2005-10-20 6:38 ` Steven Rostedt
2005-10-20 6:56 ` Ingo Molnar [this message]
2005-10-19 15:21 ` Daniel Walker
2005-10-20 6:39 ` Steven Rostedt
2005-10-20 15:02 ` Daniel Walker
2005-10-20 22:19 ` George Anzinger
2005-10-20 23:23 ` john stultz
2005-10-19 16:44 ` Frank Sorenson
2005-10-20 6:43 ` Steven Rostedt
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