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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 15:30:15 +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
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On Wednesday 12 September 2007 06:42, Christoph Lameter wrote:
> On Tue, 11 Sep 2007, Nick Piggin wrote:
> > > 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?
>
> You did not mention that in your earlier text.

Actually, I am pretty sure actually everything I mentioned was explicitly
things that your patches do not handle. This was not a coincidence.


> If these are issues then we 
> certainly can work on that. Could you first provide us some real failure
> conditions so that we know that these are real problems?

I think I would have as good a shot as any to write a fragmentation
exploit, yes. I think I've given you enough info to do the same, so I'd
like to hear a reason why it is not a problem.
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