linux-kernel - Re: [PATCH] [v2] TAINT

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Message-ID: <53F4B887.7060701@sr71.net>
Date:	Wed, 20 Aug 2014 08:02:31 -0700
From:	Dave Hansen <dave@...1.net>
To:	Ingo Molnar <mingo@...nel.org>
CC:	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,
	cl@...ux.com, penberg@...nel.org, linux-mm@...ck.org,
	kirill@...temov.name, lauraa@...eaurora.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] [v2] TAINT_PERFORMANCE

On 08/20/2014 01:11 AM, Ingo Molnar wrote:
> In any case I don't think it's a good idea to abuse existing 
> facilities just to gain attention: you'll get the extra 
> attention, but the abuse dilutes the utility of those only 
> tangentially related facilities.

I'm happy to rip the TAINT parts out.  I was just hoping that some
tooling might pick up the taint flags today, and this could get picked
up without modification of whatever those tools are.

I was _really_ hoping the dmesg from the taint would be ugly and loud
enough to be sufficient, but it was relatively terse.

> A better option might be to declare known performance killers 
> in /proc/config_debug or so, and maybe print them once at the 
> end of the bootup, with a 'WARNING:' or 'INFO:' prefix. That 
> way tooling (benchmarks, profilers, etc.) can print them, but 
> it's also present in the syslog, just in case.

Sounds reasonable to me.  As long as we have _something_ that shows up
in dmesg, it will help.
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