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

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Message-ID: <20070427134201.GC4152@infradead.org>
Date:	Fri, 27 Apr 2007 14:42:01 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	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, Apr 27, 2007 at 10:14:20PM +1000, Paul Mackerras wrote:
> It's not as simple on 64-bit powerpc with the hash table of course,
> because the page size is chosen at the segment (256MB) level,
> restricting where we can put 64k and 16M pages to some degree.

I think Christoph's variable order pagecache should be perfectly
fine on ppc64.  We're selecting the pagesize on a per-file basis,
and the page size selection would choce which segement this mmap
gets into.  Ben's get_unmapped_area changes are very helpfull for that.

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