linux-kernel - Re: [PATCH 14/19] perf metric: Add DCache

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Message-ID: <7addd402-9d59-674e-8d02-0e330cb5665f@linux.ibm.com>
Date:   Sun, 26 Jul 2020 14:49:46 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 14/19] perf metric: Add DCache_L2 to metric parse test



On 7/19/20 11:43 PM, Jiri Olsa wrote:
> Adding test that compute DCache_L2 metrics with other related metrics in it.
> 
> Acked-by: Ian Rogers <irogers@...gle.com>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Reviewed-By : Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol Jain
> ---
>  tools/perf/tests/parse-metric.c | 71 +++++++++++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
> 
> diff --git a/tools/perf/tests/parse-metric.c b/tools/perf/tests/parse-metric.c
> index 28f33893338b..aa4d5a9f09a8 100644
> --- a/tools/perf/tests/parse-metric.c
> +++ b/tools/perf/tests/parse-metric.c
> @@ -36,6 +36,27 @@ static struct pmu_event pme_test[] = {
>  	.metric_expr	= "(dcache_miss_cpi + icache_miss_cycles)",
>  	.metric_name	= "cache_miss_cycles",
>  },
> +{
> +	.metric_expr	= "l2_rqsts.demand_data_rd_hit + l2_rqsts.pf_hit + l2_rqsts.rfo_hit",
> +	.metric_name	= "DCache_L2_All_Hits",
> +},
> +{
> +	.metric_expr	= "max(l2_rqsts.all_demand_data_rd - l2_rqsts.demand_data_rd_hit, 0) + "
> +			  "l2_rqsts.pf_miss + l2_rqsts.rfo_miss",
> +	.metric_name	= "DCache_L2_All_Miss",
> +},
> +{
> +	.metric_expr	= "dcache_l2_all_hits + dcache_l2_all_miss",
> +	.metric_name	= "DCache_L2_All",
> +},
> +{
> +	.metric_expr	= "d_ratio(dcache_l2_all_hits, dcache_l2_all)",
> +	.metric_name	= "DCache_L2_Hits",
> +},
> +{
> +	.metric_expr	= "d_ratio(dcache_l2_all_miss, dcache_l2_all)",
> +	.metric_name	= "DCache_L2_Misses",
> +},
>  };
>  
>  static struct pmu_events_map map = {
> @@ -194,10 +215,60 @@ static int test_cache_miss_cycles(void)
>  	return 0;
>  }
>  
> +
> +/*
> + * DCache_L2_All_Hits = l2_rqsts.demand_data_rd_hit + l2_rqsts.pf_hit + l2_rqsts.rfo_hi
> + * DCache_L2_All_Miss = max(l2_rqsts.all_demand_data_rd - l2_rqsts.demand_data_rd_hit, 0) +
> + *                      l2_rqsts.pf_miss + l2_rqsts.rfo_miss
> + * DCache_L2_All      = dcache_l2_all_hits + dcache_l2_all_miss
> + * DCache_L2_Hits     = d_ratio(dcache_l2_all_hits, dcache_l2_all)
> + * DCache_L2_Misses   = d_ratio(dcache_l2_all_miss, dcache_l2_all)
> + *
> + * l2_rqsts.demand_data_rd_hit = 100
> + * l2_rqsts.pf_hit             = 200
> + * l2_rqsts.rfo_hi             = 300
> + * l2_rqsts.all_demand_data_rd = 400
> + * l2_rqsts.pf_miss            = 500
> + * l2_rqsts.rfo_miss           = 600
> + *
> + * DCache_L2_All_Hits = 600
> + * DCache_L2_All_Miss = MAX(400 - 100, 0) + 500 + 600 = 1400
> + * DCache_L2_All      = 600 + 1400  = 2000
> + * DCache_L2_Hits     = 600 / 2000  = 0.3
> + * DCache_L2_Misses   = 1400 / 2000 = 0.7
> + */
> +static int test_dcache_l2(void)
> +{
> +	double ratio;
> +	struct value vals[] = {
> +		{ .event = "l2_rqsts.demand_data_rd_hit", .val = 100 },
> +		{ .event = "l2_rqsts.pf_hit",             .val = 200 },
> +		{ .event = "l2_rqsts.rfo_hit",            .val = 300 },
> +		{ .event = "l2_rqsts.all_demand_data_rd", .val = 400 },
> +		{ .event = "l2_rqsts.pf_miss",            .val = 500 },
> +		{ .event = "l2_rqsts.rfo_miss",           .val = 600 },
> +		{ 0 },
> +	};
> +
> +	TEST_ASSERT_VAL("failed to compute metric",
> +			compute_metric("DCache_L2_Hits", vals, &ratio) == 0);
> +
> +	TEST_ASSERT_VAL("DCache_L2_Hits failed, wrong ratio",
> +			ratio == 0.3);
> +
> +	TEST_ASSERT_VAL("failed to compute metric",
> +			compute_metric("DCache_L2_Misses", vals, &ratio) == 0);
> +
> +	TEST_ASSERT_VAL("DCache_L2_Misses failed, wrong ratio",
> +			ratio == 0.7);
> +	return 0;
> +}
> +
>  int test__parse_metric(struct test *test __maybe_unused, int subtest __maybe_unused)
>  {
>  	TEST_ASSERT_VAL("IPC failed", test_ipc() == 0);
>  	TEST_ASSERT_VAL("frontend failed", test_frontend() == 0);
>  	TEST_ASSERT_VAL("cache_miss_cycles failed", test_cache_miss_cycles() == 0);
> +	TEST_ASSERT_VAL("DCache_L2 failed", test_dcache_l2() == 0);
>  	return 0;
>  }
>