linux-kernel - Re: Using block layer's I/O context api (block/blk-ioc.c) without CFQ.

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Message-ID: <AANLkTiktWtAefkAWJNDnSx9SKf_hAOHqcHeEAXV0ARj3@mail.gmail.com>
Date:	Fri, 20 Aug 2010 08:51:27 +0200
From:	Corrado Zoccolo <czoccolo@...il.com>
To:	Pedro Eugênio Rocha 
	<pedro.eugenio.rocha@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Using block layer's I/O context api (block/blk-ioc.c) without CFQ.

2010/8/19 Pedro Eugênio Rocha <pedro.eugenio.rocha@...il.com>:
> Hi,
Hi,
>
> Is there a way to use the generic block layer I/O context api
> (block/blk-ioc.c), without
> using cfq specific functions and structs? I'm writing an I/O scheduler
> for my master
> thesis, and I'd like to use my own functions for I/O context handling,
> not cfq's. Sorry
> if I'm missing something here.
Sure. I think you can get an idea by grabbing an old enough kernel
that still has anticipatory scheduler (if I recall correctly, 2.6.32
should have it), and look at its functions.
Or you can look at my post:
http://lists.openwall.net/linux-kernel/2009/06/08/387, where I
implemented a proof-of-concept I/O scheduler based on anticipatory
scheduler. Most of the concepts in that scheduler were later ported to
CFQ.
Do you already have a scheduling algorithm in mind? And what will be
your main purpose/target?

Thanks
Corrado
>
> Thanks,
>
> Pedro Eugênio Rocha
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-- 
__________________________________________________________________________

dott. Corrado Zoccolo                          mailto:czoccolo@...il.com
PhD - Department of Computer Science - University of Pisa, Italy
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