linux-kernel - Re: [RFC PATCH 13/22 -v2] handle accurate time keeping over long delays

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Message-ID: <Pine.LNX.4.58.0801091908470.5270@gandalf.stny.rr.com>
Date:	Wed, 9 Jan 2008 19:09:55 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	john stultz <johnstul@...ibm.com>
cc:	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>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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>
Subject: Re: [RFC PATCH 13/22 -v2] handle accurate time keeping over long
 delays


On Wed, 9 Jan 2008, john stultz wrote:
> > ---
> >  arch/x86/kernel/vsyscall_64.c |    5 ++-
> >  include/asm-x86/vgtod.h       |    2 -
> >  include/linux/clocksource.h   |   58 ++++++++++++++++++++++++++++++++++++++++--
> >  kernel/time/timekeeping.c     |   35 +++++++++++++------------
> >  4 files changed, 80 insertions(+), 20 deletions(-)
> >
> > linux-2.6.21-rc5_cycles-accumulated_C7.patch
>             ^^ An oldie but a goodie?

Hehe, I got this directly from the RT queue.

>
> I was just reminded that in the time since 2.6.21-rc5, other arches
> beside x86_64 have gained vgettimeofday implementations, and thus will
> need similar update_vsyscall() tweaks as seen below to get the correct
> time.
>
> Here's the fix for x86_64:

Thanks! I'll fold this into this patch for the next release.

-- Steve
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