linux-kernel - Re: [RFC PATCH 09/25] perf stat: Add helper functions for hardware-grouping method

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Date:   Tue, 26 Sep 2023 11:37:28 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <weilin.wang@...el.com>, Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>
CC:     <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [RFC PATCH 09/25] perf stat: Add helper functions for
 hardware-grouping method

Hello,

On 2023/9/25 14:18, weilin.wang@...el.com wrote:
> From: Weilin Wang <weilin.wang@...el.com>
> 
> Add functions to free pmu_info_list and event_info_list before exit
> grouping
> 
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
>   tools/perf/util/metricgroup.c | 32 ++++++++++++++++++++++++++++----
>   1 file changed, 28 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index feb5dab26..0ca885a42 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1507,6 +1507,27 @@ static int parse_counter(const char *counter,
>   	return 0;
>   }
>   
> +static void metricgroup__free_event_info(struct list_head
> +					*event_info_list)
> +{
> +	struct metricgroup__event_info *e, *tmp;
> +
> +	list_for_each_entry_safe(e, tmp, event_info_list, nd) {
> +		list_del_init(&e->nd);
> +		free(e);
> +	}
> +}
> +
> +static void metricgroup__free_pmu_info(struct list_head *pmu_info_list)
> +{
> +	struct metricgroup__pmu_counters *p, *tmp;
> +
> +	list_for_each_entry_safe(p, tmp, pmu_info_list, nd) {
> +		list_del_init(&p->nd);
> +		free(p);
> +	}
> +}
> +
>   static struct metricgroup__event_info *event_info__new(const char *name,
>   						      const char *pmu_name,
>   						      const char *counter,
> @@ -1524,7 +1545,8 @@ static struct metricgroup__event_info *event_info__new(const char *name,
>   	}
>   	e->name = name;
>   	e->free_counter = free_counter;
> -	e->pmu_name = strdup(pmu_name);
> +	//e->pmu_name = strdup(pmu_name);
Can the commented-out code be deleted?

> +	e->pmu_name = pmu_name;
>   	if (free_counter) {
>   		ret = set_counter_bitmap(0, e->counters);
>   		if (ret)
> @@ -1687,13 +1709,15 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
>   
>   		ret = get_metricgroup_events(id, etable, &event_info_list);
>   		if (ret)
> -			return ret;
> +			goto err_out;
>   	}
>   	ret = get_pmu_counter_layouts(&pmu_info_list, ltable);
>   	if (ret)
> -		return ret;
> -
> +		goto err_out;
There seems to be no need for "goto err_out" here.

>   
> +err_out:
> +	metricgroup__free_event_info(&event_info_list);
> +	metricgroup__free_pmu_info(&pmu_info_list);
>   	return ret;
>   #undef RETURN_IF_NON_ZERO
>   }
> 


Thanks,
Yang