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

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Message-Id: <20070915014449.4f9cdb51.akpm@linux-foundation.org>
Date:	Sat, 15 Sep 2007 01:44:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jörn Engel <joern@...fs.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>, 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
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Tue, 11 Sep 2007 14:12:26 +0200 Jörn Engel <joern@...fs.org> wrote:

> While I agree with your concern, those numbers are quite silly.  The
> chances of 99.8% of pages being free and the remaining 0.2% being
> perfectly spread across all 2MB large_pages are lower than those of SHA1
> creating a collision.

Actually it'd be pretty easy to craft an application which allocates seven
pages for pagecache, then one for <something>, then seven for pagecache, then
one for <something>, etc.

I've had test apps which do that sort of thing accidentally.  The result
wasn't pretty.
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