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

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Date:	Thu, 13 Sep 2007 03:23:21 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Chinner <dgc@....com>
Cc:	Mel Gorman <mel@...net.ie>, Christoph Lameter <clameter@....com>,
	andrea@...e.de, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>,
	William Lee Irwin III <wli@...omorphy.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 Thursday 13 September 2007 11:49, David Chinner wrote:
> On Wed, Sep 12, 2007 at 01:27:33AM +1000, Nick Piggin wrote:

> > I just gave 4 things which combined might easily reduce xfs vmap overhead
> > by several orders of magnitude, all without changing much code at all.
>
> Patches would be greatly appreciately. You obviously understand this
> vm code much better than I do, so if it's easy to fix by adding some
> generic vmap cache thingy, please do.

Well, it may not be easy to _fix_, but it's easy to try a few improvements ;)

How do I make an image and run a workload that will coerce XFS into
doing a significant number of vmaps?
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