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Message-Id: <200709111606.10873.nickpiggin@yahoo.com.au>
Date: Tue, 11 Sep 2007 16:06:09 +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 07:41, Christoph Lameter wrote:
> On Tue, 11 Sep 2007, Nick Piggin wrote:
> > 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.
>
> No you have not explained why the theoretical issues continue to exist
> given even just considering Lumpy Reclaim in .23 nor what effect the
> antifrag patchset would have.
So how does lumpy reclaim, your slab patches, or anti-frag have
much effect on the worst case situation? Or help much against a
targetted fragmentation attack?
> And you have used a 2M pagesize which is
> irrelevant to this patchset that deals with blocksizes up to 64k. In my
> experience the use of blocksize < PAGE_COSTLY_ORDER (32k) is reasonably
> safe.
I used EXACTLY the page sizes that you brought up in your patch
description (ie. 64K and 2MB).
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