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

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Message-Id: <20070427004340.1d723852.akpm@linux-foundation.org>
Date:	Fri, 27 Apr 2007 00:43:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	David Chinner <dgc@....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

On Fri, 27 Apr 2007 00:35:19 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:

> On Fri, 27 Apr 2007, Andrew Morton wrote:
> 
> > On Fri, 27 Apr 2007 00:22:26 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:
> > 
> > > I will submit pieces to mm depending on the 
> > > outcome of our discussions.
> 
> > There's a ludicrous amount of MM work pending in -mm.  It would probably be
> > less work at your end to see what ends up landing in 2.6.22-rc1.
> 
> I am aware of that and thats why I kept this against upstream. The need 
> right now is for justification and explanation. I had to go 
> through a head spinning series of VM layers to get an idea how to do 
> this in a clean way and then had to make additional passes to do minimal 
> modifications to get this working so that it is testable.

OK.

Don't get me wrong - I do think this is neat code and is a good way of
addressing the problem.  (I'm surprised that the mmap protopatch didn't
touch rmap.c).

But I don't think it's a slam dunk and I would like you to appreciate the
constraints which I believe we operate under.  And I don't think we've
adequately considered alternative solutions to the immediate performance problems.

> Performance tests please...

On various HBAs, please ;)
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