linux-kernel - Re: [PATCH v3 3/4] perf util: Flexible to set block info output formats

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Message-ID: <20200113101037.GF35080@krava>
Date:   Mon, 13 Jan 2020 11:10:37 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 3/4] perf util: Flexible to set block info output
 formats

On Wed, Jan 08, 2020 at 07:03:53AM +0800, Jin Yao wrote:

SNIP

>  int report__browse_block_hists(struct block_hist *bh, float min_percent,
>  			       struct evsel *evsel, struct perf_env *env,
> -			       struct annotation_options *annotation_opts)
> +			       struct annotation_options *annotation_opts,
> +			       bool release)
>  {
>  	int ret;
>  
> @@ -451,13 +477,17 @@ int report__browse_block_hists(struct block_hist *bh, float min_percent,
>  		symbol_conf.report_individual_block = true;
>  		hists__fprintf(&bh->block_hists, true, 0, 0, min_percent,
>  			       stdout, true);
> -		hists__delete_entries(&bh->block_hists);
> +		if (release)
> +			hists__delete_entries(&bh->block_hists);
> +
>  		return 0;
>  	case 1:
>  		symbol_conf.report_individual_block = true;
>  		ret = block_hists_tui_browse(bh, evsel, min_percent,
>  					     env, annotation_opts);
> -		hists__delete_entries(&bh->block_hists);
> +		if (release)
> +			hists__delete_entries(&bh->block_hists);
> +
>  		return ret;
>  	default:
>  		return -1;
> diff --git a/tools/perf/util/block-info.h b/tools/perf/util/block-info.h
> index bfa22c59195d..0bf01e3a423d 100644
> --- a/tools/perf/util/block-info.h
> +++ b/tools/perf/util/block-info.h
> @@ -44,7 +44,8 @@ enum {
>  struct block_report {
>  	struct block_hist	hist;
>  	u64			cycles;
> -	struct block_fmt	fmts[PERF_HPP_REPORT__BLOCK_MAX_INDEX];
> +	struct block_fmt	*fmts;

hum, couldn't you just keep the array and use it instead of allocating it?
it will never be bigger than PERF_HPP_REPORT__BLOCK_MAX_INDEX, no?

we could get rid of that release code


jirka