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

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Date:	Fri, 27 Apr 2007 20:16:25 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Christoph Lameter <clameter@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Chinner <dgc@....com>, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>, Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

William Lee Irwin III wrote:
>> What sort of strategy do you intend to use to speculatively populate
>> the pagecache with contiguous pages?

On Sat, Apr 28, 2007 at 12:50:26PM +1000, Nick Piggin wrote:
> Andrew outlined it.

I'd like to suggest a few straightforward additions to the proposal:

(1) the interface to the page allocator tries to allocate N pages where
	(a) N is a power of 2
	(b) some effort is made to get contiguity
	(c) some effort is made to fall back to lesser contiguity
	(d) some effort is made to get N pages even with no contiguity
(2) a corresponding group freeing interface to the page allocator
(3) Pass the pages around in a list or similar so that O(1) instead of
	O(pages) splice operations under the lock suffice for passing
	them around. Dissecting compound pages outside locks helps.


-- wli
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