linux-kernel - Re: [PATCH 2/9] perf/x86/intel: Basic support for metrics counters

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Message-ID: <20190529164655.GB2623@hirez.programming.kicks-ass.net>
Date:   Wed, 29 May 2019 18:46:55 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     acme@...nel.org, mingo@...hat.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, jolsa@...nel.org, eranian@...gle.com,
        alexander.shishkin@...ux.intel.com, ak@...ux.intel.com
Subject: Re: [PATCH 2/9] perf/x86/intel: Basic support for metrics counters

On Wed, May 29, 2019 at 10:40:52AM -0400, Liang, Kan wrote:
> On 5/29/2019 3:28 AM, Peter Zijlstra wrote:
> > One way would be to make these 48-51 and put BTS as 52, and then you do
> 
> Can we put BTS 47?

Sure, it doesn't matter where you put it. It just needs to be a free bit
position, the rest doesn't matter.