linux-kernel - Re: [PATCH v5 08/11] perf/tools: Refactoring metricgroup__add

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Date:   Tue, 17 Mar 2020 16:10:30 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Kajol Jain <kjain@...ux.ibm.com>
Cc:     acme@...nel.org, linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au,
        sukadev@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, anju@...ux.vnet.ibm.com,
        maddy@...ux.vnet.ibm.com, ravi.bangoria@...ux.ibm.com,
        peterz@...radead.org, yao.jin@...ux.intel.com, ak@...ux.intel.com,
        jolsa@...nel.org, kan.liang@...ux.intel.com, jmario@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        paulus@...abs.org, namhyung@...nel.org, mpetlan@...hat.com,
        gregkh@...uxfoundation.org, benh@...nel.crashing.org,
        mamatha4@...ux.vnet.ibm.com, mark.rutland@....com,
        tglx@...utronix.de
Subject: Re: [PATCH v5 08/11] perf/tools: Refactoring metricgroup__add_metric
 function

On Tue, Mar 17, 2020 at 11:53:30AM +0530, Kajol Jain wrote:
> This patch refactor metricgroup__add_metric function where
> some part of it move to function metricgroup__add_metric_param.
> No logic change.
> 
> Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
> ---
>  tools/perf/util/metricgroup.c | 63 +++++++++++++++++++++--------------
>  1 file changed, 38 insertions(+), 25 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index c3a8c701609a..b4919bcfbd8b 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -474,6 +474,41 @@ static bool metricgroup__has_constraint(struct pmu_event *pe)
>  	return false;
>  }
>  
> +static int metricgroup__add_metric_param(struct strbuf *events,
> +			struct list_head *group_list, struct pmu_event *pe)
> +{
> +
> +	const char **ids;
> +	int idnum;
> +	struct egroup *eg;
> +	int ret = -EINVAL;
> +
> +	if (expr__find_other(pe->metric_expr, NULL, &ids, &idnum, 1) < 0)
> +		return ret;
> +
> +	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)
> +		ret = -ENOMEM;

??? you need to return in here, eg is NULL

> +
> +	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;
> +
> +	return ret;
> +}
> +
>  static int metricgroup__add_metric(const char *metric, struct strbuf *events,
>  				   struct list_head *group_list)
>  {
> @@ -493,35 +528,13 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
>  			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)
> +			ret = metricgroup__add_metric_param(events,
> +							group_list, pe);
> +			if (ret == -EINVAL)
>  				continue;

previous code did 'continue' on ret < 0, why just -EINVAL now?

jirka