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: <CABPqkBTZH8eF6aMm0SD8YB2F6YM2BRaZKQymAKtwD-peAae28Q@mail.gmail.com>
Date:   Fri, 19 Jan 2018 12:50:09 -0800
From:   Stephane Eranian <eranian@...gle.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     "Liang, Kan" <kan.liang@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "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>
Subject: Re: [PATCH V5 4/8] perf/x86/intel/uncore: add new data structures for
 free running counters

On Fri, Jan 19, 2018 at 12:24 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>> Oh, think a bit more.
>> I think we cannot do the same thing as we did for CPU PMU's fixed counters.
>>
>> The counters here are free running counters. They cannot be start/stop.
>
> Yes free running counter have completely different semantics. They
> need a separate event code.
>
Are you saying, you can be shared with no multiplexing?

> -Andi