linux-kernel - Re: a bug in AS scheduler?

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Message-ID: <20070228121040.GW3733@kernel.dk>
Date:	Wed, 28 Feb 2007 13:10:40 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Xiaoning Ding <dingxn@....ohio-state.edu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: a bug in AS scheduler?

On Tue, Feb 27 2007, Xiaoning Ding wrote:
> Hi,
> 
> I am reading the source code AS scheduler in 2.6.18(as-ioscheduler.c).
> In function as_close_req, variable delay is in millisecond, while
> ad->antic_expire is in jiffies. Doesn't the comparison of delay and
> ad->antic_expire make any problem?
> The related source code is quoted blow:
> 
> 	if (ad->antic_status == ANTIC_OFF || !ad->ioc_finished)
> 		delay = 0;
> 	else
> 		delay = ((jiffies - ad->antic_start) * 1000) / HZ;

antic_start is in jiffies, the difference is here multiplied by 1000 and
divided by HZ to turn it into msecs. so delay is in msecs.

-- 
Jens Axboe

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