linux-kernel - Re: SLUB defrag pull request?

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Message-ID: <48F378C6.7030206@linux-foundation.org>
Date:	Mon, 13 Oct 2008 09:35:18 -0700
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
CC:	penberg@...helsinki.fi, nickpiggin@...oo.com.au, hugh@...itas.com,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: SLUB defrag pull request?

Miklos Szeredi wrote:
> And the things kick_inodes() does without any sort of locking look
> even more dangerous.
>
> It should be the other way round: first make sure nothing is
> referencing the inode, and _then_ start cleaning it up with
> appropriate locks held.  See prune_icache().
>
>   
kick_inodes() only works on inodes that first have undergone 
get_inodes() where we establish a refcount under inode_lock(). The final 
cleanup in kick_inodes() is done under iprune_mutex. You are looking at 
the loop that does writeback and invalidates attached dentries. This can 
fail for various reasons.

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