linux-kernel - Re: [PATCH 09/19] perf metric: Collect referenced metrics in struct metric

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Date:   Sun, 26 Jul 2020 14:48:35 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 09/19] perf metric: Collect referenced metrics in struct
 metric_expr



On 7/19/20 11:43 PM, Jiri Olsa wrote:
> Add referenced metrics into struct metric_expr object,
> so they are accessible when computing the metric.
> 
> Storing just name and expression itself, so the metric
> can be resolved and computed.
> 
> Acked-by: Ian Rogers <irogers@...gle.com>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Reviewed-By : Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol Jain
> ---
>  tools/perf/util/metricgroup.c | 32 ++++++++++++++++++++++++++++++++
>  tools/perf/util/metricgroup.h |  6 ++++++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index d1b2c1aa436f..bb5757b9419d 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -83,6 +83,7 @@ static void metric_event_delete(struct rblist *rblist __maybe_unused,
>  	struct metric_expr *expr, *tmp;
>  
>  	list_for_each_entry_safe(expr, tmp, &me->head, nd) {
> +		free(expr->metric_refs);
>  		free(expr);
>  	}
>  
> @@ -248,6 +249,7 @@ static int metricgroup__setup_events(struct list_head *groups,
>  
>  	list_for_each_entry (eg, groups, nd) {
>  		struct evsel **metric_events;
> +		struct metric_ref *metric_refs = NULL;
>  
>  		metric_events = calloc(sizeof(void *),
>  				hashmap__size(&eg->pctx.ids) + 1);
> @@ -279,6 +281,36 @@ static int metricgroup__setup_events(struct list_head *groups,
>  			free(metric_events);
>  			break;
>  		}
> +
> +		/*
> +		 * Collect and store collected nested expressions
> +		 * for metric processing.
> +		 */
> +		if (eg->metric_refs_cnt) {
> +			struct metric_ref_node *ref;
> +
> +			metric_refs = zalloc(sizeof(struct metric_ref) * (eg->metric_refs_cnt + 1));
> +			if (!metric_refs) {
> +				ret = -ENOMEM;
> +				free(metric_events);
> +				break;
> +			}
> +
> +			i = 0;
> +			list_for_each_entry(ref, &eg->metric_refs, list) {
> +				/*
> +				 * Intentionally passing just const char pointers,
> +				 * originally from 'struct pmu_event' object.
> +				 * We don't need to change them, so there's no
> +				 * need to create our own copy.
> +				 */
> +				metric_refs[i].metric_name = ref->metric_name;
> +				metric_refs[i].metric_expr = ref->metric_expr;
> +				i++;
> +			}
> +		};
> +
> +		expr->metric_refs = metric_refs;
>  		expr->metric_expr = eg->metric_expr;
>  		expr->metric_name = eg->metric_name;
>  		expr->metric_unit = eg->metric_unit;
> diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
> index 8315bd1a7da4..62623a39cbec 100644
> --- a/tools/perf/util/metricgroup.h
> +++ b/tools/perf/util/metricgroup.h
> @@ -18,12 +18,18 @@ struct metric_event {
>  	struct list_head head; /* list of metric_expr */
>  };
>  
> +struct metric_ref {
> +	const char *metric_name;
> +	const char *metric_expr;
> +};
> +
>  struct metric_expr {
>  	struct list_head nd;
>  	const char *metric_expr;
>  	const char *metric_name;
>  	const char *metric_unit;
>  	struct evsel **metric_events;
> +	struct metric_ref *metric_refs;
>  	int runtime;
>  };
>  
>