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

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Message-ID: <Pine.LNX.4.64.0709111311330.25781@schroedinger.engr.sgi.com>
Date:	Tue, 11 Sep 2007 13:13:33 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...e.de>
cc:	Mel Gorman <mel@....ul.ie>, Nick Piggin <nickpiggin@...oo.com.au>,
	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 Tue, 11 Sep 2007, Andrea Arcangeli wrote:

> But the whole point is that with the config_page_shift, Nick's worst
> case scenario can't happen by design regardless of defrag or not
> defrag. While it can _definitely_ happen with SGI design (regardless
> of any defrag thing). We can still try to save some memory by
> defragging the slab a bit, but it's by far *not* required with
> config_page_shift. No defrag at all is required infact.

Which worst case scenario? So far this is all a bit foggy.

> Let's see how good the mmap support for variable order page size will
> work after the 2 weeks...

Yeah. Give us some failure scenarios please!
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