linux-kernel - Re: [RESEND] [PATCH linux-2.6-block#for-2.6.32] Seperate read and write statistics of in

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Message-ID: <20090911071753.GC18599@kernel.dk>
Date:	Fri, 11 Sep 2009 09:17:53 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
Cc:	Mark Landis <mark.landis@...adata.com>,
	Alasdair G Kergon <agk@...hat.com>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND] [PATCH linux-2.6-block#for-2.6.32] Seperate read and
	write statistics of in_flight requests

On Fri, Sep 11 2009, Nikanth Karthikesan wrote:
> Currently, there is a single in_flight counter measuring the number of
> requests in the request_queue. But some monitoring tools would like to
> know how many read requests and write requests are in progress. Split the
> current in_flight counter into two seperate counters for read and write.
> 
> This information is exported as a sysfs attribute, as changing the
> currently available stat files would break the existing tools.

Applied, this is better than breaking existing stat exports.

-- 
Jens Axboe

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