linux-kernel - Re: [PATCH] Perf stat: Fix the ratio comments of miss-events

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Message-ID: <20191119155936.GC24290@kernel.org>
Date:   Tue, 19 Nov 2019 12:59:36 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     lqqq341 <liuqi115@...ilicon.com>
Cc:     peterz@...radead.org, mingo@...hat.com, ak@...ux.intel.com,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linuxarm@...wei.com, john.garry@...wei.com,
        zhangshaokun@...ilicon.com, huangdaode@...ilicon.com,
        linyunsheng@...wei.com
Subject: Re: [PATCH] Perf stat: Fix the ratio comments of miss-events

Em Sat, Nov 16, 2019 at 03:48:41PM +0800, lqqq341 escreveu:
> From: Qi Liu <liuqi115@...ilicon.com>
> 
> Perf stat displays miss ratio of L1-dcache, L1-icache, dTLB cache,
> iTLB cache and LL-cache. Take L1-dcache for example, its miss ratio
> is caculated as "L1-dcache-load-misses/L1-dcache-loads". So "of all
> L1-dcache hits" is unsuitable to describe it, and "of all L1-dcache
> accesses" seems better. The comments of L1-icache, dTLB cache, iTLB
> cache and LL-cache are fixed in the same way.
> 
> Signed-off-by: Qi Liu <liuqi115@...ilicon.com>
> ---
>  tools/perf/util/stat-shadow.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> index 2c41d47..a3bdf2b 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -506,7 +506,8 @@ static void print_l1_dcache_misses(struct perf_stat_config *config,
>  
>  	color = get_ratio_color(GRC_CACHE_MISSES, ratio);
>  
> -	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all L1-dcache hits", ratio);
> +	out->print_metric(config, out->ctx, color, "%7.2f%%",
> +			  "of all L1-dcache accesses", ratio);


Why have you reflowed all those lines? This patch should have been like:

-	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all L1-dcache hits", ratio);
+	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all L1-dcache accesses", ratio);

Notice how it is easier to compare the changes, and also to keep the
flowing like it was before your change,

Thanks,

- Arnaldo

>  }
>  
>  static void print_l1_icache_misses(struct perf_stat_config *config,
> @@ -527,7 +528,8 @@ static void print_l1_icache_misses(struct perf_stat_config *config,
>  		ratio = avg / total * 100.0;
>  
>  	color = get_ratio_color(GRC_CACHE_MISSES, ratio);
> -	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all L1-icache hits", ratio);
> +	out->print_metric(config, out->ctx, color, "%7.2f%%",
> +			  "of all L1-icache accesses", ratio);
>  }
>  
>  static void print_dtlb_cache_misses(struct perf_stat_config *config,
> @@ -547,7 +549,8 @@ static void print_dtlb_cache_misses(struct perf_stat_config *config,
>  		ratio = avg / total * 100.0;
>  
>  	color = get_ratio_color(GRC_CACHE_MISSES, ratio);
> -	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all dTLB cache hits", ratio);
> +	out->print_metric(config, out->ctx, color, "%7.2f%%",
> +			  "of all dTLB cache accesses", ratio);
>  }
>  
>  static void print_itlb_cache_misses(struct perf_stat_config *config,
> @@ -567,7 +570,8 @@ static void print_itlb_cache_misses(struct perf_stat_config *config,
>  		ratio = avg / total * 100.0;
>  
>  	color = get_ratio_color(GRC_CACHE_MISSES, ratio);
> -	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all iTLB cache hits", ratio);
> +	out->print_metric(config, out->ctx, color, "%7.2f%%",
> +			  "of all iTLB cache accesses", ratio);
>  }
>  
>  static void print_ll_cache_misses(struct perf_stat_config *config,
> @@ -587,7 +591,8 @@ static void print_ll_cache_misses(struct perf_stat_config *config,
>  		ratio = avg / total * 100.0;
>  
>  	color = get_ratio_color(GRC_CACHE_MISSES, ratio);
> -	out->print_metric(config, out->ctx, color, "%7.2f%%", "of all LL-cache hits", ratio);
> +	out->print_metric(config, out->ctx, color, "%7.2f%%",
> +			  "of all LL-cache accesses", ratio);
>  }
>  
>  /*
> @@ -872,7 +877,8 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
>  		if (runtime_stat_n(st, STAT_L1_DCACHE, ctx, cpu) != 0)
>  			print_l1_dcache_misses(config, cpu, evsel, avg, out, st);
>  		else
> -			print_metric(config, ctxp, NULL, NULL, "of all L1-dcache hits", 0);
> +			print_metric(config, ctxp, NULL, NULL,
> +				     "of all L1-dcache accesses", 0);
>  	} else if (
>  		evsel->core.attr.type == PERF_TYPE_HW_CACHE &&
>  		evsel->core.attr.config ==  ( PERF_COUNT_HW_CACHE_L1I |
> @@ -882,7 +888,8 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
>  		if (runtime_stat_n(st, STAT_L1_ICACHE, ctx, cpu) != 0)
>  			print_l1_icache_misses(config, cpu, evsel, avg, out, st);
>  		else
> -			print_metric(config, ctxp, NULL, NULL, "of all L1-icache hits", 0);
> +			print_metric(config, ctxp, NULL, NULL,
> +				     "of all L1-icache accesses", 0);
>  	} else if (
>  		evsel->core.attr.type == PERF_TYPE_HW_CACHE &&
>  		evsel->core.attr.config ==  ( PERF_COUNT_HW_CACHE_DTLB |
> @@ -892,7 +899,8 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
>  		if (runtime_stat_n(st, STAT_DTLB_CACHE, ctx, cpu) != 0)
>  			print_dtlb_cache_misses(config, cpu, evsel, avg, out, st);
>  		else
> -			print_metric(config, ctxp, NULL, NULL, "of all dTLB cache hits", 0);
> +			print_metric(config, ctxp, NULL, NULL,
> +				     "of all dTLB cache accesses", 0);
>  	} else if (
>  		evsel->core.attr.type == PERF_TYPE_HW_CACHE &&
>  		evsel->core.attr.config ==  ( PERF_COUNT_HW_CACHE_ITLB |
> @@ -902,7 +910,8 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
>  		if (runtime_stat_n(st, STAT_ITLB_CACHE, ctx, cpu) != 0)
>  			print_itlb_cache_misses(config, cpu, evsel, avg, out, st);
>  		else
> -			print_metric(config, ctxp, NULL, NULL, "of all iTLB cache hits", 0);
> +			print_metric(config, ctxp, NULL, NULL,
> +				     "of all iTLB cache accesses", 0);
>  	} else if (
>  		evsel->core.attr.type == PERF_TYPE_HW_CACHE &&
>  		evsel->core.attr.config ==  ( PERF_COUNT_HW_CACHE_LL |
> @@ -912,7 +921,8 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
>  		if (runtime_stat_n(st, STAT_LL_CACHE, ctx, cpu) != 0)
>  			print_ll_cache_misses(config, cpu, evsel, avg, out, st);
>  		else
> -			print_metric(config, ctxp, NULL, NULL, "of all LL-cache hits", 0);
> +			print_metric(config, ctxp, NULL, NULL,
> +				     "of all LL-cache accesses", 0);
>  	} else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES)) {
>  		total = runtime_stat_avg(st, STAT_CACHEREFS, ctx, cpu);
>  
> -- 
> 2.8.1

-- 

- Arnaldo