linux-kernel - Re: [patch] timer: Add a mod_timer

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Message-ID: <20091123065108.1fd78779@infradead.org>
Date:	Mon, 23 Nov 2009 06:51:08 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	alan@...ux.intel.com
Subject: Re: [patch] timer: Add a mod_timer_msec() API function

On Mon, 23 Nov 2009 09:26:48 +0100
Ingo Molnar <mingo@...e.hu> wrote:
> 
> This code first rounds to 1 second - and if that doesnt fall within
> the slack window it rounds to the (rather aribtrary) rounding of 16
> jiffies.
> 
> I'd suggest to use up the slack to its maximum, by rounding up modulo 
> the largest power-of-2 value that still fits into the slack.
> 
> So if slack is 30, the rounding is 16. If slack is 5, the rounding is
> 4, etc.

well.. the point of the rounding is that there is a maximum likelyhood
that OTHER timers align.

I suppose what you suggest would do that too; need to think of a clever
way to not make that expensive
(after coffee I'll look at if xor + find first bit will work ;-)

> 
> 	Ingo


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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