linux-kernel - Re: [PATCH] slub: reduce overhead of slub

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Date:	Thu, 07 Jul 2011 13:30:44 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, rientjes@...gle.com,
	linux-mm@...ck.org
Subject: Re: [PATCH] slub: reduce overhead of slub_debug

On Thu, 2011-07-07 at 13:17 -0500, Christoph Lameter wrote:
> On Thu, 7 Jul 2011, Pekka Enberg wrote:
> 
> > Looks good to me. Christoph, David, ?
> 
> The reason debug code is there is because it is useless overhead typically
> not needed. There is no point in optimizing the code that is not run in
> production environments unless there are gross performance issues that
> make debugging difficult. A performance patch for debugging would have to
> cause significant performance improvements. This patch does not do that
> nor was there such an issue to be addressed in the first place.

Deja vu.

-- 
Mathematics is the supreme nostalgia of our time.


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