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

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Date:	Tue, 11 Sep 2007 15:30:15 +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 06:42, 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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