linux-kernel - Re: Proposal: make RAID6 code optional

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Message-ID: <18922.50299.133847.743973@notabene.brown>
Date:	Sun, 19 Apr 2009 16:28:11 +1000
From:	Neil Brown <neilb@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>,
	"Matti Aarnio" <matti.aarnio@...iler.org>,
	"Jesper Juhl" <jj@...osbits.net>,
	"Prakash Punnoor" <prakash@...noor.de>,
	"Michael Tokarev" <mjt@....msk.ru>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: Proposal: make RAID6 code optional

On Sunday April 19, neilb@...e.de wrote:
> 
> In 2.6.30, the Q syndrome code has been moved into a separate module,
> so raid456.ko should be quite a bit smaller.

Of course that doesn't really help as there will be a dependency
between raid456.ko and pq.ko so you cannot avoid having pq.ko loaded
while using raid5.

It might make sense to create a raid6 module that just contains 
The call to register_md_personality(raid6_personality) and some
linkage so that the code in raid456.ko can get to the code in pq.ko.

This is probably worth trying one the raid6 async offload stuff
stabilises.

NeilBrown
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