linux-kernel - Re: [PATCH 2/2] SLUB: Disable debugging if it increases the minimum page order

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Message-ID: <alpine.DEB.1.10.0906111118350.14020@gentwo.org>
Date:	Thu, 11 Jun 2009 11:20:50 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	linux-kernel@...r.kernel.org, mel@....ul.ie,
	Larry.Finger@...inger.net
Subject: Re: [PATCH 2/2] SLUB: Disable debugging if it increases the minimum
 page order

On Thu, 11 Jun 2009, Pekka Enberg wrote:

> I think my patch is the simplest solution here: it turns off debugging
> for those caches where the metadata bumps up the minimum allocation
> order and I suspect that we disable cache only for 4096 in practice.

There could be other slab caches that would randomly be affected by this.
I ran a couple of times into situations where I had to hack slab to do
debugging of exempted slabs.

> Also note that when we switch back to more aggressive page allocator
> pass-through, we lose SLUB debugging support.

Debugging options can have side effects. Slab debugging is not something
suitable by default for production environments.

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