linux-kernel - a bug in AS scheduler?

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Message-ID: <45E5038F.1090200@cse.ohio-state.edu>
Date:	Tue, 27 Feb 2007 23:22:39 -0500
From:	Xiaoning Ding <dingxn@....ohio-state.edu>
To:	linux-kernel@...r.kernel.org
Subject: a bug in AS scheduler?

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;

	if (delay == 0)
		delta = 8192;
	else if (delay <= 20 && delay <= ad->antic_expire)
		delta = 8192 << delay;
	else
		return 1;

Xiaoning
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