linux-kernel - Re: [00/41] Large Blocksize Support V7 (adds memmap support)

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Message-ID: <Pine.LNX.4.64.0709171504150.29993@schroedinger.engr.sgi.com>
Date:	Mon, 17 Sep 2007 15:05:18 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Mel Gorman <mel@....ul.ie>, andrea@...e.de,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	hugh@...itas.com, joern@...ybastard.org
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Sun, 16 Sep 2007, Nick Piggin wrote:

> > > fsblock doesn't need any of those hacks, of course.
> >
> > Nor does mine for the low orders that we are considering. For order >
> > MAX_ORDER this is unavoidable since the page allocator cannot manage such
> > large pages. It can be used for lower order if there are issues (that I
> > have not seen yet).
> 
> Or we can just avoid all doubt (and doesn't have arbitrary limitations
> according to what you think might be reasonable or how well the
> system actually behaves).

We can avoid all doubt in this patchset as well by adding support for 
fallback to a vmalloced compound page.

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