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

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Date:	Tue, 11 Sep 2007 14:53:41 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
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 Wednesday 12 September 2007 06:11, Christoph Lameter wrote:
> On Tue, 11 Sep 2007, Nick Piggin wrote:
> > It would be interesting to craft an attack. If you knew roughly the
> > layout and size of your dentry slab for example... maybe you could stat a
> > whole lot of files, then open one and keep it open (maybe post the fd to
> > a unix socket or something crazy!) when you think you have filled up a
> > couple of MB worth of them. Repeat the process until your movable zone is
> > gone. Or do the same things with pagetables, or task structs, or radix
> > tree nodes, etc.. these are the kinds of things I worry about (as well as
> > just the gradual natural degredation).
>
> I guess you would have to run that without my targeted slab reclaim
> patchset? Otherwise the slab that are in the way could be reclaimed and
> you could not produce your test case.

I didn't realise you had patches to move pinned dentries, radix tree nodes,
task structs, page tables etc. Did I miss them in your last patchset?
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