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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Christoph Lameter <clameter@sgi.com>
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)
Date: Tue, 11 Sep 2007 14:43:53 +1000
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Cc: andrea@suse.de, torvalds@linux-foundation.org,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
       Christoph Hellwig <hch@lst.de>, Mel Gorman <mel@skynet.ie>,
       William Lee Irwin III <wli@holomorphy.com>, David Chinner <dgc@sgi.com>,
       Jens Axboe <jens.axboe@oracle.com>,
       Badari Pulavarty <pbadari@gmail.com>,
       Maxim Levitsky <maximlevitsky@gmail.com>,
       Fengguang Wu <fengguang.wu@gmail.com>, swin wang <wangswin@gmail.com>,
       totty.lu@gmail.com, hugh@veritas.com, joern@lazybastard.org
References: <20070911060349.993975297@sgi.com> <200709110452.20363.nickpiggin@yahoo.com.au> <Pine.LNX.4.64.0709111256250.25781@schroedinger.engr.sgi.com>
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On Wednesday 12 September 2007 06:01, Christoph Lameter wrote:
> On Tue, 11 Sep 2007, Nick Piggin wrote:
> > There is a limitation in the VM. Fragmentation. You keep saying this
> > is a solved issue and just assuming you'll be able to fix any cases
> > that come up as they happen.
> >
> > I still don't get the feeling you realise that there is a fundamental
> > fragmentation issue that is unsolvable with Mel's approach.
>
> Well my problem first of all is that you did not read the full message. It
> discusses that later and provides page pools to address the issue.
>
> Secondly you keep FUDding people with lots of theoretical concerns
> assuming Mel's approaches must fail. If there is an issue (I guess there
> must be right?) then please give us a concrete case of a failure that we
> can work against.

On the other hand, you ignore the potential failure cases, and ignore
the alternatives that do not have such cases.
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