Date: Tue, 3 Jun 2003 19:25:12 -0700
From: jw schultz <jw@pegasys.ws>
To: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH] linux-2.5.70_btime-fix_A0
Message-ID: <20030604022512.GI12649@pegasys.ws>
Mail-Followup-To: jw schultz <jw@pegasys.ws>,
	lkml <linux-kernel@vger.kernel.org>
References: <1054681259.32091.783.camel@w-jstultz2.beaverton.ibm.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1054681259.32091.783.camel@w-jstultz2.beaverton.ibm.com>
User-Agent: Mutt/1.3.27i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1149
Lines: 33

On Tue, Jun 03, 2003 at 04:00:59PM -0700, john stultz wrote:
> All,
> 
> 	Since jiffies didn't necessarily start incrementing at a second
> boundary, jiffies/HZ doesn't increment at the same moment as
> xtime.tv_sec. This causes one second wobbles in the calculation of btime
> (xtime.tv_sec - jiffies/HZ).  
> 
> This fix increases the precision of the calculation so the usec
> component of xtime is used as well. Additionally it fixes some of the
> non-atomic reading of time values. 
> 
> 
> This is a fix for bugme bug #764.
> http://bugme.osdl.org/show_bug.cgi?id=764
> 
> 
> Let me know if you have any comments

Might it not be cheaper to start jiffies at the 1 second
boundary or with a value that simulates that?

-- 
________________________________________________________________
	J.W. Schultz            Pegasystems Technologies
	email address:		jw@pegasys.ws

		Remember Cernan and Schmitt
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/