linux-kernel - Re: [RFC PATCH] Introduce timekeeper latch synchronization

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Message-ID: <20130914011825.GA24859@Krystal>
Date:	Fri, 13 Sep 2013 21:18:25 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	lttng-dev@...ts.lttng.org
Subject: Re: [RFC PATCH] Introduce timekeeper latch synchronization

* John Stultz (john.stultz@...aro.org) wrote:
> On 09/13/2013 08:30 AM, Mathieu Desnoyers wrote:
> > By the way, if there are some standard test-bench for timekeeping, I'd
> > be very interested to hear about them.
> I've got a git repo of tests that I use for basic sanity checks here:
>     https://github.com/johnstultz-work/timetests.git

Thanks for the pointer! It looks like I'm currently breaking
CLOCK_MONOTONIC_RAW. My thoughts are that struct clocksource read vs
updates are relying on the timekeeper seqlock for synchronization.
Therefore, I might have to apply the latch scheme to struct clocksource
too.

Thoughts ?

Thanks,

Mathieu

> 
> thanks
> -john
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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