linux-kernel - Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC

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Message-ID: <20151206220651.GM17308@twins.programming.kicks-ass.net>
Date:	Sun, 6 Dec 2015 23:06:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	vincent.weaver@...ne.edu, jolsa@...hat.com,
	torvalds@...ux-foundation.org, eranian@...gle.com,
	tglx@...utronix.de, acme@...hat.com, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:
 ppp

On Sun, Dec 06, 2015 at 02:11:02PM +0100, Ingo Molnar wrote:
> Also, I'm not convinced we need a new 'ppp' qualifier for any of this, why not 
> just replace 'pp' with this event - 'pp' is meant to be our most precise event.

I requested this because the PREC_DIST events can only be scheduled on a
single counter, whereas the existing :pp events can be had on all 4.

This mean you can have 2 concurrent :pp users (without RR), but not :ppp.
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