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

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Message-ID: <20120508161022.GC20433@kroah.com>
Date:	Tue, 8 May 2012 09:10:22 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Borislav Petkov <bp@...64.org>,
	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, 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 08:48:33AM -0700, H. Peter Anvin wrote:
> On 05/08/2012 08:41 AM, Borislav Petkov wrote:
> > 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...
> > 
> 
> I don't see a problem with it in sysfs.

If it's in sysfs, it better be documented in Documentation/ABI.

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