linux-kernel - Re: [PATCH 01/18] move do_timer() from kernel/timer.c into kernel/time/timekeeping.c

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Date:	Mon, 24 Jan 2011 23:10:18 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	john stultz <johnstul@...ibm.com>
cc:	Torben Hohn <torbenh@....de>, LKML <linux-kernel@...r.kernel.org>,
	hch@...radead.org, yong.zhang0@...il.com,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 01/18] move do_timer() from kernel/timer.c into
 kernel/time/timekeeping.c

B1;2401;0cOn Mon, 24 Jan 2011, john stultz wrote:
> I'm guessing Thomas is thinking to move these bits into timekeeping.c so
> xtime_lock can be made static there, it just strikes me oddly.
> Especially since jiffies access is still going to need the xtime_lock,
> so we'd have to move all the jiffies code into timekeeping.c to do so.

That should go into jiffies.c. We don't need to move everything to
timekeeping.c.
 
> Splitting the xtime_lock int a static timekeeper.lock and a static
> jiffies_lock might be the clean way to divide things, but that really
> just adds extra locking overhead. But maybe that's not much of an issue.
> 
> Thomas: I suspect I'm just not seeing where you're going with this.
> Could you clarify a bit? :)

We really want to restrict xtime_lock to the core timekeeping
code. xtime_update() is really meant to take care of the timekeeping
updates. do_timer() is a horrible misnomer today.

The call to calc_global_load() is there for hysterical raisins and we
really should get rid of it sooner than later. I'm quite sure that it
could be run from a timer callback as well. Peter ?

Does that answer your questions ?

Thanks,

	tglx


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