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

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Message-ID: <12c511ca0801101154q224c7a43sa016190cf209d304@mail.gmail.com>
Date:	Thu, 10 Jan 2008 11:54:23 -0800
From:	"Tony Luck" <tony.luck@...el.com>
To:	"john stultz" <johnstul@...ibm.com>
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>,
	"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

> Tony:  ia64 also needs something like this, but I found the fsyscall asm
> bits a little difficult to grasp. So I'll need some assistance on how to
> include the accumulated cycles into the final calculation.

I'm trying to figure out all the ramifications of the new
"cycle_accumulated" field.  Does it really need to be
propagated all the way to the low level assembler (which
I don't want to mess with unless I really, really have to).
Can't I do the necessary calculations in update_vsyscall()
[Where I can do them in C :-)] and keep the same low
level assembly code.  I think I must be missing some
important bit of what is going on here.

-Tony
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