linux-kernel - Re: [RFC PATCH 16/22 -v2] add get_monotonic

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Message-ID: <1f1b08da0801161436k4a7ac1e3kd83590951e7bebb9@mail.gmail.com>
Date:	Wed, 16 Jan 2008 14:36:02 -0800
From:	"john stultz" <johnstul@...ibm.com>
To:	"Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Christoph Hellwig" <hch@...radead.org>,
	"Gregory Haskins" <ghaskins@...ell.com>,
	"Arnaldo Carvalho de Melo" <acme@...stprotocols.net>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Tim Bird" <tim.bird@...sony.com>,
	"Sam Ravnborg" <sam@...nborg.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"Steven Rostedt" <srostedt@...hat.com>,
	"Paul Mackerras" <paulus@...ba.org>,
	"Daniel Walker" <dwalker@...sta.com>, johnstul@...ibm.com
Subject: Re: [RFC PATCH 16/22 -v2] add get_monotonic_cycles

On Jan 16, 2008 6:56 AM, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> If you really want an seqlock free algorithm (I _do_ want this for
> tracing!) :) maybe going in the RCU direction could help (I refer to my
> RCU-based 32-to-64 bits lockless timestamp counter extension, which
> could be turned into the clocksource updater).

Yea. After our earlier discussion and talking w/ Steven, I'm taking a
swing at this now.  The lock-free method still doesn't apply to the
update_wall_time function, but does work fine for the monotonic cycle
uses.  I'll send a patch for review as soon as I get things building.

thanks
-john
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