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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Christoph Lameter <clameter@sgi.com>
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)
Date: Tue, 11 Sep 2007 14:53:41 +1000
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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
References: <20070911060349.993975297@sgi.com> <200709111144.48743.nickpiggin@yahoo.com.au> <Pine.LNX.4.64.0709111309250.25781@schroedinger.engr.sgi.com>
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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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