linux-kernel - Re: [00/17] Large Blocksize Support V3

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Date:	Thu, 26 Apr 2007 17:17:54 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
CC:	David Chinner <dgc@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

Christoph Lameter wrote:
> On Thu, 26 Apr 2007, Nick Piggin wrote:
> 
> 
>>>Nick, what's the buffer layer? Are you talking about operations
>>>based on bufferheads?
>>
>>Yeah. Our pgoff_t->sector_t translation.
> 
> 
> Sadly the buffers in the buffer layer still assume contiguous memory. You 
> would have to add a series of pointers there and then add a layer to 
> handle this.

That's the least of the problems with rewriting the buffer layer.

But I maintain that the end result is better than the fragmentation
based approach. A lot of people don't actually want a bigger page
cache size, because they want efficient internal fragmentation as
well, so your radix-tree based approach isn't really comparable.

-- 
SUSE Labs, Novell Inc.
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