linux-kernel - Re: Integration of SCST in the mainstream Linux kernel

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Message-Id: <1202144767.3096.38.camel@localhost.localdomain>
Date:	Mon, 04 Feb 2008 11:06:06 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Vladislav Bolkhovitin <vst@...b.net>
Cc:	Bart Van Assche <bart.vanassche@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-scsi@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: Integration of SCST in the mainstream Linux kernel


On Mon, 2008-02-04 at 19:25 +0300, Vladislav Bolkhovitin wrote:
> James Bottomley wrote:
> >>Vladislav Bolkhovitin wrote:
> >>So, James, what is your opinion on the above? Or the overall SCSI target 
> >>project simplicity doesn't matter much for you and you think it's fine 
> >>to duplicate Linux page cache in the user space to keep the in-kernel 
> >>part of the project as small as possible?
> > 
> > 
> > The answers were pretty much contained here
> > 
> > http://marc.info/?l=linux-scsi&m=120164008302435
> > 
> > and here:
> > 
> > http://marc.info/?l=linux-scsi&m=120171067107293
> > 
> > Weren't they?
> 
> No, sorry, it doesn't look so for me. They are about performance, but 
> I'm asking about the overall project's architecture, namely about one 
> part of it: simplicity. Particularly, what do you think about 
> duplicating Linux page cache in the user space to have zero-copy cached 
> I/O? Or can you suggest another architectural solution for that problem 
> in the STGT's approach?

Isn't that an advantage of a user space solution?  It simply uses the
backing store of whatever device supplies the data.  That means it takes
advantage of the existing mechanisms for caching.

James


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