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

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Date:	Mon, 17 Sep 2007 13:10:57 +0200
From:	Bernd Schmidt <bernds_cb1@...nline.de>
To:	Christoph Lameter <clameter@....com>
CC:	Nick Piggin <nickpiggin@...oo.com.au>, 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)

Christoph Lameter wrote:
> True. That is why we want to limit the number of unmovable allocations and 
> that is why ZONE_MOVABLE exists to limit those. However, unmovable 
> allocations are already rare today. The overwhelming majority of 
> allocations are movable and reclaimable. You can see that f.e. by looking 
> at /proc/meminfo and see how high SUnreclaim: is (does not catch 
> everything but its a good indicator).

Just to inject another factor into the discussion, please remember that 
Linux also runs on nommu systems, where things like user space 
allocations are neither movable nor reclaimable.


Bernd

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