linux-kernel - Re: SLUB defrag pull request?

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Message-Id: <E1KpOOL-0003Vf-9y@pomaz-ex.szeredi.hu>
Date:	Mon, 13 Oct 2008 16:27:25 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	penberg@...helsinki.fi
CC:	nickpiggin@...oo.com.au, hugh@...itas.com, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	cl@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: SLUB defrag pull request?

On Mon, 13 Oct 2008, Miklos Szeredi wrote:
> On Mon, 13 Oct 2008, Nick Piggin wrote:
> > In many cases, yes it seems to. And some of the approaches even if
> > they work now seem like they *might* cause problematic constraints
> > in the design... Have Al and Christoph reviewed the dentry and inode
> > patches?
> 
> This d_invalidate() looks suspicious to me:

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().

Miklos
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