netdev - Re: [PATCH] timers: consider slack value in mod

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Date:	Wed, 25 May 2011 12:57:28 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yong Zhang <yong.zhang0@...il.com>
cc:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] timers: consider slack value in mod_timer()

On Wed, 25 May 2011, Thomas Gleixner wrote:
> On Wed, 25 May 2011, Yong Zhang wrote:
>  	} else {
> -		unsigned long now = jiffies;
> +		long delta = expires - jiffies;
> +
> +		if (delta < 256)
> +			return expires;
>  
> -		/* No slack, if already expired else auto slack 0.4% */
> -		if (time_after(expires, now))
> -			expires_limit = expires + (expires - now)/256;
> +		expires_limit = expires + (expires - now)/256;

That should be

+		expires_limit = expires + delta / 256;

of course.

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