linux-kernel - Re: [PATCH v4 1/5] perf stat: Add AGGR_PCIE

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Date:   Thu, 4 Feb 2021 21:07:55 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Alexander Antonov <alexander.antonov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v4 1/5] perf stat: Add AGGR_PCIE_PORT mode

Hello,

On Wed, Feb 3, 2021 at 10:58 PM Alexander Antonov
<alexander.antonov@...ux.intel.com> wrote:
>
> Adding AGGR_PCIE_PORT mode to be able to distinguish aggr_mode
> for root ports in following patches.

I'm not sure adding the AGGR_PCIE_PORT is the right way.
In my understanding, the aggr mode is to specify how we aggregate
counter values of a single event from different cpus.  But this seems
to aggregate counter values from different events.  Also the new
mode is basically the same as AGGR_GLOBAL.

As you will add stat_config.iostat_run to distinguish the iostat
command, probably we just want to use the global aggr mode
(and it's the default!) and get rid of the AGGR_PCIE_PORT.

Thoughts?

Thanks,
Namhyung