linux-kernel - Re: Horrible btrfs performance due to fragmentation

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Message-ID: <AANLkTimMCw8p+YJRzCg7_cEn4UEDTC6vxs6ByUjJYMnL@mail.gmail.com>
Date:	Mon, 1 Nov 2010 12:09:43 -0400
From:	Gregory Maxwell <gmaxwell@...il.com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Hugo Mills <hugo-lkml@...fax.org.uk>, cwillu <cwillu@...llu.com>,
	Calvin Walton <calvin.walton@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-btrfs@...r.kernel.org, Chris Mason <chris.mason@...cle.com>
Subject: Re: Horrible btrfs performance due to fragmentation

On Mon, Nov 1, 2010 at 11:58 AM, Felipe Contreras
<felipe.contreras@...il.com> wrote:
> Or when going through all the fragments of a file, have a counter, and
> if it exceeds certain limit mark it somehow, so that it gets
> defragmented at least to a certain extent.

Thats elegant, — then resources are only spent on defragmenting files
which are actually in use and which actually need it... but I don't
see how it deals with the partial mutual exclusivity of defragmenting
and COWed files.
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