linux-kernel - Re: [PATCH] perf metric: Fix metric

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Date:   Mon, 17 Jan 2022 18:04:01 +0000
From:   John Garry <john.garry@...wei.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <eranian@...gle.com>
Subject: Re: [PATCH] perf metric: Fix metric_leader

On 15/01/2022 06:28, Ian Rogers wrote:
> Multiple events may have a metric_leader to aggregate into. This happens
> for uncore events where, for example, uncore_imc is expanded into
> uncore_imc_0, uncore_imc_1, etc. Such events all have the same metric_id
> and should aggregate into the first event. The change introducing
> metric_ids had a bug where the metric_id was compared to itself,
> creating an always true condition. Correct this by comparing the
> event in the metric_evlist and the metric_leader.
> 
> Fixes: ec5c5b3d2c21 ("perf metric: Encode and use metric-id as qualifier")
> Signed-off-by: Ian Rogers<irogers@...gle.com>
> ---

Looks ok and I quickly tested it:
Reviewed-by: John Garry <john.garry@...wei.com>