linux-kernel - Re: [PATCH] [RFC] TAINT

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Date:	Tue, 19 Aug 2014 19:03:03 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Laura Abbott <lauraa@...eaurora.org>
cc:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org,
	dave.hansen@...ux.intel.com, peterz@...radead.org,
	mingo@...hat.com, ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
	akpm@...ux-foundation.org, penberg@...nel.org, linux-mm@...ck.org
Subject: Re: [PATCH] [RFC] TAINT_PERFORMANCE

On Tue, 19 Aug 2014, Laura Abbott wrote:

> I nominate CONFIG_DEBUG_PAGEALLOC, CONFIG_SLUB_DEBUG,
> CONFIG_SLUB_DEBUG_ON as well since I've wasted days debugging
> supposed performance issues where those were on.

CONFIG_SLUB_DEBUG is not enabling debugging. It just includes the code to
do so at kernel bootup. Not a performance problem. CONFIG_SLUB_DEBUG_ON is
a performance issue since debugging will be on by default.

CONFIG_SLAB_DEBUG is also a performance issue since this option makes slab
run with debugging.

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