linux-kernel - Re: inodes: Support generic defragmentation

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Date:	Mon, 1 Feb 2010 11:50:16 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Dave Chinner <david@...morbit.com>
cc:	Andi Kleen <andi@...stfloor.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Alexander Viro <viro@....linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Christoph Lameter <clameter@....com>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	akpm@...ux-foundation.org, Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org
Subject: Re: inodes: Support generic defragmentation

On Sat, 30 Jan 2010, Dave Chinner wrote:

> How do you expect defrag to behave when the filesystem doesn't free
> the inode immediately during dispose_list()? That is, the above code
> only finds inodes that are still active at the VFS level but they
> may still live for a significant period of time after the
> dispose_list() call. This is a real issue now that XFS has combined
> the VFS and XFS inodes into the same slab...

Then the freeing of the slab has to be delayed until the objects are
freed.

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