linux-kernel - Re: [PATCH 2/2] cfq-iosched: Take care of corner cases of group losing share due to deletion

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Date:	Wed, 09 Dec 2009 14:06:10 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	guijianfeng@...fujitsu.com
Subject: Re: [PATCH 2/2] cfq-iosched: Take care of corner cases of group losing share due to deletion

Vivek Goyal <vgoyal@...hat.com> writes:

> Reported-by: Gui Jianfeng <guijianfeng@...fujitsu.com> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

> +	/*
> +	 * If think times is less than a jiffy than ttime_mean=0 and above
> +	 * will not be true. It might happen that slice has not expired yet
> +	 * but will expire soon (4-5 ns) during select_queue(). To cover the

4-5ns?  I'm not sure why you chose these numbers.  Is that what you saw
in testing?  Anyway, I'm ok with the change, I dislike the reference to
time when a single jiffy could be up to 10ms.

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>
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