From: tony@bakeyournoodle•com (Tony Breeds)
To: john stultz <johnstul@us•ibm.com>
Cc: Andrew Morton <akpm@osdl•org>, Daniel Walker <dwalker@mvista•com>,
LKML <linux-kernel@vger•kernel.org>,
LinuxPPC-dev <linuxppc-dev@ozlabs•org>,
Thomas Gleixner <tglx@linutronix•de>, Ingo Molnar <mingo@elte•hu>
Subject: Re: [RFC] clocksouce implementation for powerpc
Date: Fri, 22 Jun 2007 16:28:42 +1000 [thread overview]
Message-ID: <20070622062842.GY9768@bakeyournoodle.com> (raw)
In-Reply-To: <1182373561.6559.39.camel@localhost.localdomain>
On Wed, Jun 20, 2007 at 02:06:01PM -0700, john stultz wrote:
Hi John.
> Hey Tony,
> Thanks for sending this out! I really appreciate this work, as its been
> on my todo forever, and I've just not been able to focus on it.
> Currently it seems a bit minimal of a conversion (ideally there should
> be very little time code left), but It looks like a great start!
Thanks.
> I might be missing a subtlety in the ppc code, but I'm still not sure if
> I see the need for the clocksource settimeofday hook.
>
> update_vsyscall() is intended to provide a hook that allows the generic
> time code to provide all the needed timekeeping state to the arch
> specific vsyscall implementation. It is called any time the base
> timekeeping variables are changed.
Well as I just said the Daniel, I was under the impression I needed a
hook that was only called from settimeofday(). The comments I've
recieved from everyone has given me good cause to re-evaluate.
I think I can make it work without the hook, that started this
discussion. Thomas, I think it's probably best to axe it now. If I
/really/ need it then I'll start the discussion again :) Thanks.
> I think it would be enlightening to flatten this out a bit. Putting both
> the timer_recalc_offset and clocksource_settime code in the same
> function. It might illustrate where some optimizations could be done and
> where it might make more sense to split things up.
>
> Also I'd leave timer_check_rtc() in the timer_interrupt for now (later
> moving it to tglx's generic rtc update).
Yes you're rigth I don't need to move the timer_check_rtc() call.
Yours Tony
linux.conf.au http://linux.conf.au/ || http://lca2008.linux.org.au/
Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!
prev parent reply other threads:[~2007-06-22 6:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070616101126.296384219@inhelltoy.tec.linutronix.de>
[not found] ` <20070616101637.107940593@inhelltoy.tec.linutronix.de>
[not found] ` <1182009083.11539.369.camel@imap.mvista.com>
2007-06-20 6:57 ` [RFC] clocksouce implementation for powerpc Tony Breeds
2007-06-20 14:57 ` Daniel Walker
2007-06-20 17:20 ` Sergei Shtylyov
2007-06-20 17:31 ` Thomas Gleixner
2007-06-20 18:11 ` Sergei Shtylyov
2007-06-22 6:23 ` Tony Breeds
2007-06-20 16:53 ` Sergei Shtylyov
2007-06-22 6:10 ` Tony Breeds
2007-06-22 12:42 ` Sergei Shtylyov
2007-06-20 21:06 ` john stultz
2007-06-22 6:28 ` Tony Breeds [this message]
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