linux-kernel - Re: [PATCH RFC v3 09/12] perf metricgroup: Split up metricgroup__add

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Message-ID: <20200511110118.GA2986380@krava>
Date:   Mon, 11 May 2020 13:01:18 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     John Garry <john.garry@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org, will@...nel.org, ak@...ux.intel.com,
        linuxarm@...wei.com, linux-kernel@...r.kernel.org,
        qiangqing.zhang@....com, irogers@...gle.com, robin.murphy@....com,
        zhangshaokun@...ilicon.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RFC v3 09/12] perf metricgroup: Split up
 metricgroup__add_metric()

On Thu, May 07, 2020 at 07:57:48PM +0800, John Garry wrote:
> To aid supporting system event metric groups, break up the function
> metricgroup__add_metric() into a part which iterates metrics and a part
> which actually "adds" the metric.
> 
> No functional change intended.

this no longer applied on Arnaldo's perf/core,
it's very busy part now :-\

jirka

> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  tools/perf/util/metricgroup.c | 75 ++++++++++++++++++++++++++-----------------
>  1 file changed, 45 insertions(+), 30 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 926449a7cdbf..d1033756a1bc 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -231,6 +231,12 @@ static bool match_metric(const char *n, const char *list)
>  	return false;
>  }
>  
> +static bool match_pe_metric(struct pmu_event *pe, const char *metric)
> +{
> +	return match_metric(pe->metric_group, metric) ||
> +	       match_metric(pe->metric_name, metric);
> +}
> +
>  struct mep {
>  	struct rb_node nd;
>  	const char *name;
> @@ -485,6 +491,40 @@ static bool metricgroup__has_constraint(struct pmu_event *pe)
>  	return false;
>  }
>  
> +static int metricgroup__add_metric_pmu_event(struct pmu_event *pe,
> +					     struct strbuf *events,
> +					     struct list_head *group_list)
> +{
> +	const char **ids;
> +	int idnum;
> +	struct egroup *eg;
> +
> +	pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
> +
> +	if (expr__find_other(pe->metric_expr, NULL, &ids, &idnum) < 0)
> +		return 0;
> +
> +	if (events->len > 0)
> +		strbuf_addf(events, ",");
> +
> +	if (metricgroup__has_constraint(pe))
> +		metricgroup__add_metric_non_group(events, ids, idnum);
> +	else
> +		metricgroup__add_metric_weak_group(events, ids, idnum);
> +
> +	eg = malloc(sizeof(*eg));
> +	if (!eg)
> +		return -ENOMEM;
> +	eg->ids = ids;
> +	eg->idnum = idnum;
> +	eg->metric_name = pe->metric_name;
> +	eg->metric_expr = pe->metric_expr;
> +	eg->metric_unit = pe->unit;
> +	list_add_tail(&eg->nd, group_list);
> +
> +	return 0;
> +}
> +
>  static int metricgroup__add_metric(const char *metric, struct strbuf *events,
>  				   struct list_head *group_list)
>  {
> @@ -502,37 +542,12 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
>  			break;
>  		if (!pe->metric_expr)
>  			continue;
> -		if (match_metric(pe->metric_group, metric) ||
> -		    match_metric(pe->metric_name, metric)) {
> -			const char **ids;
> -			int idnum;
> -			struct egroup *eg;
> -
> -			pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
>  
> -			if (expr__find_other(pe->metric_expr,
> -					     NULL, &ids, &idnum) < 0)
> -				continue;
> -			if (events->len > 0)
> -				strbuf_addf(events, ",");
> -
> -			if (metricgroup__has_constraint(pe))
> -				metricgroup__add_metric_non_group(events, ids, idnum);
> -			else
> -				metricgroup__add_metric_weak_group(events, ids, idnum);
> -
> -			eg = malloc(sizeof(struct egroup));
> -			if (!eg) {
> -				ret = -ENOMEM;
> -				break;
> -			}
> -			eg->ids = ids;
> -			eg->idnum = idnum;
> -			eg->metric_name = pe->metric_name;
> -			eg->metric_expr = pe->metric_expr;
> -			eg->metric_unit = pe->unit;
> -			list_add_tail(&eg->nd, group_list);
> -			ret = 0;
> +		if (match_pe_metric(pe, metric)) {
> +			ret = metricgroup__add_metric_pmu_event(pe, events,
> +								group_list);
> +			if (ret)
> +				return ret;
>  		}
>  	}
>  	return ret;
> -- 
> 2.16.4
>