linux-kernel - Re: [PATCH 4/4] perf/x86/cqm: Support cqm/mbm only for perf events

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Message-ID: <20160425200826.GO3448@twins.programming.kicks-ass.net>
Date:	Mon, 25 Apr 2016 22:08:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	"Shankar, Ravi V" <ravi.v.shankar@...el.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"Shivappa, Vikas" <vikas.shivappa@...el.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"Anvin, H Peter" <h.peter.anvin@...el.com>
Subject: Re: [PATCH 4/4] perf/x86/cqm: Support cqm/mbm only for perf events

On Mon, Apr 25, 2016 at 04:23:58PM +0000, Luck, Tony wrote:
> >> Hence removing support for the parts which are broken rather than
> >> pretending to support it and giving incorrect data.
> >
> > Uh what, how about attempt to fix it?
> 
> No hope to do that by 4.6 release ... so I suggested to Vikas that it would be better to disable
> the feature now so users wouldn't be confused by the random numbers that they'll see if
> they try to do this.

Of course, that might have been useful information to have in the
changelog to begin with.

But seeing that its been broken for a number of releases I don't see how
this is urgent to stuff in this one.

I'd instead be more inclined to hurry with Stephanes patches..