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Date: Thu, 26 Apr 2007 17:45:24 +1000
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Christoph Lameter <clameter@sgi.com>
CC: David Chinner <dgc@sgi.com>, "Eric W. Biederman" <ebiederm@xmission.com>,
       linux-kernel@vger.kernel.org, Mel Gorman <mel@skynet.ie>,
       William Lee Irwin III <wli@holomorphy.com>,
       Jens Axboe <jens.axboe@oracle.com>,
       Badari Pulavarty <pbadari@gmail.com>,
       Maxim Levitsky <maximlevitsky@gmail.com>
Subject: Re: [00/17] Large Blocksize Support V3
References: <20070424222105.883597089@sgi.com> <m1hcr3oi0m.fsf@ebiederm.dsl.xmission.com> <46303A98.9000605@yahoo.com.au> <Pine.LNX.4.64.0704252337390.30340@schroedinger.engr.sgi.com> <46304C74.9040304@yahoo.com.au> <20070426070454.GF32602149@melbourne.sgi.com> <46304FAF.7020700@yahoo.com.au> <Pine.LNX.4.64.0704260011140.30731@schroedinger.engr.sgi.com> <46305222.60502@yahoo.com.au> <Pine.LNX.4.64.0704260022570.31003@schroedinger.engr.sgi.com>
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Christoph Lameter wrote:
> On Thu, 26 Apr 2007, Nick Piggin wrote:
> 
> 
>>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.
> 
> 
> Me? Radix tree based approach? That approach is in the kernel. Do not 
> create a solution where there is no problem. If we do not want to 
> support large blocksizes then lets be honest and say so instead of 
> redefining what a block is. The current approach is fine if one is 
> satisfied with scatter gather and the VM overhead coming with handling 
> these pages. I fail to see what any of what you are proposing would add to 
> that.

I'm not just making this up. Fragmentation. OK?

-- 
SUSE Labs, Novell Inc.