linux-kernel - Re: [PATCH v1 7/8] perf c2c: Add option '-d llc' for sorting with LLC load

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Date:   Tue, 20 Oct 2020 09:25:53 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>, Joe Mario <jmario@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Don Zickus <dzickus@...hat.com>, Al Grant <Al.Grant@....com>,
        James Clark <james.clark@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 7/8] perf c2c: Add option '-d llc' for sorting with
 LLC load

On Thu, Oct 15, 2020 at 03:50:40PM +0100, Leo Yan wrote:

SNIP

> @@ -1533,6 +1539,7 @@ static struct c2c_header percent_hitm_header[] = {
>  	[DISPLAY_LCL] = HEADER_BOTH("Lcl", "Hitm"),
>  	[DISPLAY_RMT] = HEADER_BOTH("Rmt", "Hitm"),
>  	[DISPLAY_TOT] = HEADER_BOTH("Tot", "Hitm"),
> +	[DISPLAY_LLC] = HEADER_BOTH("LLC", "Hit"),
>  };
>  
>  static struct c2c_dimension dim_percent_hitm = {
> @@ -2002,6 +2009,10 @@ static bool he__display(struct hist_entry *he, struct c2c_stats *stats)
>  		break;
>  	case DISPLAY_TOT:
>  		FILTER_ENTRY(tot_hitm);
> +		break;
> +	case DISPLAY_LLC:
> +		FILTER_ENTRY(tot_llchit);
> +		break;
>  	default:
>  		break;
>  	}
> @@ -2032,6 +2043,9 @@ static inline bool is_valid_hist_entry(struct hist_entry *he)
>  	case DISPLAY_TOT:
>  		has_record = !!c2c_he->stats.tot_hitm;
>  		break;
> +	case DISPLAY_LLC:
> +		has_record = !!c2c_he->stats.tot_llchit;
> +		break;
>  	default:
>  		break;
>  	}

there's one more switch with c2c.display in percent_hitm function,
where you did not add DISPLAY_LLC case.. I guess it should not ever
because we will not use that column in llc display mode, but we
should add at least some warning or that

SNIP

> -				"cl_rmt_hitm,"
> -				"cl_lcl_hitm,"
> -				"cl_stores_l1hit,"
> -				"cl_stores_l1miss,"
> -				"dcacheline",
> -				NULL);
> +	ret = hpp_list__parse(&hpp_list, cl_output, NULL);
>  
>  	if (WARN_ONCE(ret, "failed to setup sort entries\n"))
>  		return;
> @@ -2357,7 +2384,7 @@ static void print_c2c_info(FILE *out, struct perf_session *session)
>  		fprintf(out, "%-36s: %s\n", first ? "  Events" : "", evsel__name(evsel));
>  		first = false;
>  	}
> -	fprintf(out, "  Cachelines sort on                : %s HITMs\n",
> +	fprintf(out, "  Cachelines sort on                : %s\n",
>  		display_str[c2c.display]);
>  	fprintf(out, "  Cacheline data grouping           : %s\n", c2c.cl_sort);
>  }
> @@ -2514,7 +2541,7 @@ static int perf_c2c_browser__title(struct hist_browser *browser,
>  {
>  	scnprintf(bf, size,
>  		  "Shared Data Cache Line Table     "
> -		  "(%lu entries, sorted on %s HITMs)",
> +		  "(%lu entries, sorted on %s)",
>  		  browser->nr_non_filtered_entries,
>  		  display_str[c2c.display]);
>  	return 0;
> @@ -2720,6 +2747,8 @@ static int setup_display(const char *str)
>  		c2c.display = DISPLAY_RMT;
>  	else if (!strcmp(display, "lcl"))
>  		c2c.display = DISPLAY_LCL;
> +	else if (!strcmp(display, "llc"))
> +		c2c.display = DISPLAY_LLC;

please update man page with this

>  	else {
>  		pr_err("failed: unknown display type: %s\n", str);
>  		return -1;
> @@ -2766,9 +2795,10 @@ static int build_cl_output(char *cl_sort, bool no_source)
>  	}
>  
>  	if (asprintf(&c2c.cl_output,
> -		"%s%s%s%s%s%s%s%s%s%s",
> +		"%s%s%s%s%s%s%s%s%s%s%s",

why is there extra '%s' when we did not add new argument.. ?

SNIP

> +			     "ld_fbhit,ld_l1hit,ld_l2hit,"
> +			     "ld_lclhit,lcl_hitm,"
> +			     "ld_rmthit,rmt_hitm,"
> +			     "dram_lcl,dram_rmt";
> +	else /* c2c.display == DISPLAY_LLC */
> +		output_str = "cl_idx,"
> +			     "dcacheline,"
> +			     "dcacheline_node,"
> +			     "dcacheline_count,"
> +			     "percent_llchit,"
> +			     "tot_llchit,"
> +			     "tot_recs,"
> +			     "tot_loads,"
> +			     "tot_stores,"
> +			     "stores_l1hit,stores_l1miss,"
> +			     "ld_fbhit,ld_l1hit,ld_l2hit,"
> +			     "ld_lclhit,lcl_hitm,"
> +			     "ld_rmthit,rmt_hitm,"
> +			     "dram_lcl,dram_rmt";
> +
> +	if (c2c.display == DISPLAY_TOT)
> +		sort_str = "tot_hitm";
> +	else if (c2c.display == DISPLAY_RMT)
> +		sort_str = "rmt_hitm";
> +	else if (c2c.display == DISPLAY_LCL)
> +		sort_str = "lcl_hitm";
> +	else if (c2c.display == DISPLAY_LLC)
> +		sort_str = "tot_llchit";
> +

could you please split addition of output_str/sort_str into separate
patch and then add DISPLAY_LLC support? it'd ease up review 

perhaps include also print_pareto changes in it 

thanks,
jirka

> +	c2c_hists__reinit(&c2c.hists, output_str, sort_str);
>  
>  	ui_progress__init(&prog, c2c.hists.hists.nr_entries, "Sorting...");
>  
> -- 
> 2.17.1
>