linux-kernel - Re: [PATCH] [v3] warn on performance-impacting configs aka. TAINT

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Message-ID: <53F773A2.7040904@sr71.net>
Date:	Fri, 22 Aug 2014 09:45:22 -0700
From:	Dave Hansen <dave@...1.net>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, dave.hansen@...ux.intel.com,
	peterz@...radead.org, mingo@...hat.com, ak@...ux.intel.com,
	akpm@...ux-foundation.org, cl@...ux.com, penberg@...nel.org,
	linux-mm@...ck.org, kirill@...temov.name, lauraa@...eaurora.org
Subject: Re: [PATCH] [v3] warn on performance-impacting configs aka. TAINT_PERFORMANCE

On 08/22/2014 09:32 AM, Tim Chen wrote:
>> > +#ifdef CONFIG_DEBUG_OBJECTS_FREE
>> > +	"DEBUG_OBJECTS_FREE",
>> > +#endif
>> > +#ifdef CONFIG_DEBUG_KMEMLEAK
>> > +	"DEBUG_KMEMLEAK",
>> > +#endif
>> > +#ifdef CONFIG_DEBUG_PAGEALLOC
>> > +	"DEBUG_PAGEALLOC",
> I think coverage profiling also impact performance.
> So I sould also put CONFIG_GCOV_KERNEL in the list.

Would CONFIG_GCOV_PROFILE_ALL be the better one to check?  With plain
GCOV_KERNEL, I don't think we will, by default, put the coverage
information in any files and slow them down.
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