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

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Message-Id: <200709181011.17975.nickpiggin@yahoo.com.au>
Date:	Tue, 18 Sep 2007 10:11:17 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
Cc:	Mel Gorman <mel@...net.ie>,
	Goswin von Brederlow <brederlo@...ormatik.uni-tuebingen.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joern Engel <joern@...fs.org>, andrea@...e.de,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	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
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Tuesday 18 September 2007 08:00, Christoph Lameter wrote:
> On Sun, 16 Sep 2007, Nick Piggin wrote:
> > I don't know how it would prevent fragmentation from building up
> > anyway. It's commonly the case that potentially unmovable objects
> > are allowed to fill up all of ram (dentries, inodes, etc).
>
> Not in 2.6.23 with ZONE_MOVABLE. Unmovable objects are not allocated from
> ZONE_MOVABLE and thus the memory that can be allocated for them is
> limited.

Why would ZONE_MOVABLE require that "movable objects should be moved
out of the way for unmovable ones"? It never _has_ any unmovable objects in
it. Quite obviously we were not talking about reserve zones.
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