linux-kernel - Re: [patch 4/5] fail-injection capability for disk IO

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Message-ID: <20060823120355.GD5893@suse.de>
Date:	Wed, 23 Aug 2006 14:03:55 +0200
From:	Jens Axboe <axboe@...e.de>
To:	Akinobu Mita <mita@...aclelinux.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, okuji@...ug.org
Subject: Re: [patch 4/5] fail-injection capability for disk IO

On Wed, Aug 23 2006, Akinobu Mita wrote:
> This patch provides fail-injection capability for disk IO.
> 
> Boot option:
> 
> 	fail_make_request=<probability>,<interval>,<times>,<space>
> 
> 	<probability>
> 
> 		specifies how often it should fail in percent.
> 
> 	<interval>
> 
> 		specifies the interval of failures.
> 
> 	<times>
> 
> 		specifies how many times failures may happen at most.
> 
> 	<space>
> 
> 		specifies the size of free space where disk IO can be issued
> 		safely in bytes.
> 
> Example:
> 
> 	fail_make_request=100,10,-1,0
> 
> generic_make_request() fails once per 10 times.

Hmm dunno, seems a pretty useless feature to me. Wouldn't it make a lot
more sense to do this per-queue instead of a global entity?

-- 
Jens Axboe

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