linux-kernel - Re: [PATCH] simplify update_times (avoid jiffies/jiffies

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Date:	Wed, 2 Aug 2006 14:50:32 +0200
From:	"Martin Schwidefsky" <schwidefsky@...glemail.com>
To:	"Atsushi Nemoto" <anemo@....ocn.ne.jp>
Cc:	johnstul@...ibm.com, akpm@...l.org, zippel@...ux-m68k.org,
	clameter@...r.sgi.com, linux-kernel@...r.kernel.org,
	ralf@...ux-mips.org, ak@....de
Subject: Re: [PATCH] simplify update_times (avoid jiffies/jiffies_64 aliasing problem)

On 8/1/06, Atsushi Nemoto <anemo@....ocn.ne.jp> wrote:
> > I think that this is going into the wrong direction. There are a
> > number of architectures that call do_timer(regs) in a while loop. It
> > would be much nicer if do_timer would get the number of passed ticks
> > as an argument. And the "regs" argument to do_timer is just useless.
>
> But normally do_timer() is called just once, isn't it?  These loops
> are just for lost ticks, which would be rarely happened.  So I think
> tunning for usual case is better.

If you switch of the hz timer in idle you'll get lots of lost ticks.
And if you are
running a virtualized system you can loose you cpu for some ticks as well.
Pass the number of ticks to do_timer.

-- 
blue skies,
  Martin
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