linux-kernel - Re: [PATCH V5 4/8] perf/x86/intel/uncore: add new data structures for free running counters

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Message-ID: <20180119130731.GQ2228@hirez.programming.kicks-ass.net>
Date:   Fri, 19 Jan 2018 14:07:31 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "acme@...nel.org" <acme@...nel.org>,
        "eranian@...gle.com" <eranian@...gle.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH V5 4/8] perf/x86/intel/uncore: add new data structures
 for free running counters

On Thu, Jan 18, 2018 at 05:43:10PM +0000, Liang, Kan wrote:
> In the uncore document, there is no event-code assigned to free running counters.
> Some events need to be defined to indicate the free running counters.
> The events are encoded as event-code + umask-code.
> 
> The event-code for all free running counters is 0xff, which is the same as
> the fixed counters.

Is it possible to count the same things using the generic counters?