linux-kernel - Re: SLUB defrag pull request?

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Message-ID: <84144f020810221348j536f0d84vca039ff32676e2cc@mail.gmail.com>
Date:	Wed, 22 Oct 2008 23:48:56 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Miklos Szeredi" <miklos@...redi.hu>
Cc:	cl@...ux-foundation.org, 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?

On Wed, Oct 22, 2008 at 11:26 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
> Because you don't _need_ a reliable reference to access the contents
> of the dentry.  The dentry is still there after being freed, as long
> as the underlying slab is there and isn't being reused for some other
> purpose.  But you can easily ensure that from the slab code.
>
> Hmm?

Actually, when debugging is enabled, it's customary to poison the
object, for example (see free_debug_processing() in mm/slub.c). So we
really can't "easily ensure" that in the allocator unless we by-pass
all the current debugging code.
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