From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <clameter@sgi.com>
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)
Date: Mon, 17 Sep 2007 15:05:18 -0700 (PDT)
Message-ID: <Pine.LNX.4.64.0709171504150.29993@schroedinger.engr.sgi.com>
References: <20070911060349.993975297@sgi.com> <200709140651.30735.nickpiggin@yahoo.com.au>
 <Pine.LNX.4.64.0709141048320.15813@schroedinger.engr.sgi.com>
 <200709161822.47879.nickpiggin@yahoo.com.au>
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Cc: Mel Gorman <mel@csn.ul.ie>, andrea@suse.de,
	torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Mel Gorman <mel@skynet.ie>,
	William Lee Irwin III <wli@holomorphy.com>,
	David Chinner <dgc@sgi.com>,
	Jens Axboe <jens.axboe@oracle.com>,
	Badari Pulavarty <pbadari@gmail.com>,
	Maxim Levitsky <maximlevitsky@gmail.com>,
	Fengguang Wu <fengguang.wu@gmail.com>,
	swin wang <wangswin@gmail.com>, totty.lu@gmail.com,
	hugh@veritas.com, joern@lazybastard.org
To: Nick Piggin <nickpiggin@yahoo.com.au>
Return-path: <linux-kernel-owner+glk-linux-kernel-3=40m.gmane.org-S1760938AbXIQWFd@vger.kernel.org>
In-Reply-To: <200709161822.47879.nickpiggin@yahoo.com.au>
Sender: linux-kernel-owner@vger.kernel.org
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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.