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

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Message-ID: <20070426145310.GH19966@holomorphy.com>
Date:	Thu, 26 Apr 2007 07:53:10 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Christoph Lameter <clameter@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	David Chinner <dgc@....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 Thu, Apr 26, 2007 at 05:42:17PM +1000, Nick Piggin wrote:
> Actually, I don't know why people are so excited about being able to
> use higher order allocations (I would rather be more excited about
> never having to use them). But for those few places that really need
> it, I'd rather see them use a virtually mapped kernel with proper
> defragmentation rather than putting hacks all through the core code.

In memory as on disk, contiguity matters a lot for performance.


On Thu, Apr 26, 2007 at 05:42:17PM +1000, Nick Piggin wrote:
> I don't think that it is solved, and I think the heuristics that are
> there would be put under more stress if they become widely used. And
> it isn't only about whether we can get the page or not, but also about
> the cost. Look up Linus's arguments about page colouring, which are
> similar and  I also think are pretty valid.

Perhaps broader exposure would help demonstrate their efficacy, or
otherwise discover what deficits need to be addressed.


-- wli
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