linux-kernel - Re: [Patch] SCSI I/O statistics

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Message-ID: <20060926182347.GH5017@parisc-linux.org>
Date:	Tue, 26 Sep 2006 12:23:47 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Andrew Morton <akpm@...l.org>
Cc:	Martin Peschke <mp3@...ibm.com>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [Patch] SCSI I/O statistics

On Tue, Sep 26, 2006 at 10:39:30AM -0700, Andrew Morton wrote:
> - Should it have been done at the block layer rather than at the scsi layer?

This was already mentioned when he sent it to linux-scsi a few days ago.
There are scsi commands which bypass the block layer, such as SG_IO, and
block layer stats can make an extremely busy disc look not busy.
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