linux-kernel - Re: [PATCH] Seperate read and write statistics of in

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Date:	Mon, 24 Aug 2009 13:07:36 +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: [PATCH] Seperate read and write statistics of in_flight
	requests

On Mon, Aug 24 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 patch is based on a patch from Mark Landis <mark.landis@...adata.com>

With fear of stating the obvious, this changes the output format of the
exported stat files. This can/will break existing tools.

-- 
Jens Axboe

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