linux-kernel - Re: [11/36] Use page_cache

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Message-ID: <Pine.LNX.4.64.0708310821140.16456@schroedinger.engr.sgi.com>
Date:	Fri, 31 Aug 2007 08:22:45 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	Dmitry Monakhov <dmonakhov@...ru>, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>, Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	"H. Peter Anvin" <hpa@...or.com>, joern@...ybastard.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [11/36] Use page_cache_xxx in fs/buffer.c

On Fri, 31 Aug 2007, Jens Axboe wrote:

> > Ok. So another solution maybe to limit the blocksizes that can be used 
> > with a device?
> 
> That'd work for creation, but not for moving things around.

What do you mean by moving things around? Creation binds a filesystem to a 
device.

> > Hmmmm.. We could keep the existing scheme too and check that device 
> > drivers split things up if they are too large? Isnt it possible today
> > to create a huge bio of 2M for huge pages and send it to a device?
> 
> Not sure, aren't the constituents of compound pages the basis for IO?

get_user_pages() serializes compound pages into the base pages. But doesnt 
the I/O layer coalesce these later into 2M chunks again?
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