linux-kernel - Re: [PATCH v3 7/7] x86/tlb: add tlb_flushall

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Message-ID: <20120508154150.GG13568@aftab.osrc.amd.com>
Date:	Tue, 8 May 2012 17:41:50 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Alex Shi <alex.shi@...el.com>, mgorman@...e.de,
	npiggin@...il.com, tglx@...utronix.de, mingo@...hat.com,
	arnd@...db.de, rostedt@...dmis.org, fweisbec@...il.com,
	jeremy@...p.org, gregkh@...uxfoundation.org, glommer@...hat.com,
	riel@...hat.com, luto@....edu, avi@...hat.com, len.brown@...el.com,
	dhowells@...hat.com, fenghua.yu@...el.com, yinghai@...nel.org,
	ak@...ux.intel.com, cpw@....com, steiner@....com,
	akpm@...ux-foundation.org, penberg@...nel.org, hughd@...gle.com,
	rientjes@...gle.com, kosaki.motohiro@...fujitsu.com,
	n-horiguchi@...jp.nec.com, paul.gortmaker@...driver.com,
	trenn@...e.de, tj@...nel.org, oleg@...hat.com, axboe@...nel.dk,
	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 7/7] x86/tlb: add tlb_flushall_factor into sysfs for
 user change

On Tue, May 08, 2012 at 08:31:53AM -0700, H. Peter Anvin wrote:
> On 05/08/2012 08:25 AM, Borislav Petkov wrote:
> > 
> > Yep, this was supposed to be for pinpointing the proper entries count.
> > I believe we don't have this thing of having code intree but not really
> > intree - only for testing new silicon. Maybe a debug module or add this
> > to debugfs?
> > 
> 
> We have a lot of that kind of code, it is usually hidden under
> CONFIG_*DEBUG* something.

Then maybe this is where this knob should go, along with adding it to
debugfs instead of sysfs...

-- 
Regards/Gruss,
Boris.

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