linux-kernel - Re: [PATCH 8/8] perf stat: Add computation of TopDown formulas

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Date:	Fri, 20 May 2016 12:23:27 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 8/8] perf stat: Add computation of TopDown formulas

On Fri, May 13, 2016 at 06:44:57PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Implement the TopDown formulas in perf stat. The topdown basic metrics
> reported by the kernel are collected, and the formulas are computed
> and output as normal metrics.
> 
> See the kernel commit exporting the events for details on the used
> metrics.
> 
> v2: Always print all metrics, only use thresholds for coloring.
> v3: Mark retiring over threshold green, not red.
> v4:
> Only print one decimal digit
> Fix color printing of one metric
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/stat-shadow.c | 156 ++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/stat.c        |   5 ++
>  tools/perf/util/stat.h        |   5 ++
>  3 files changed, 166 insertions(+)
> 
> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> index fdb71961143e..182050f2785a 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -36,6 +36,11 @@ static struct stats runtime_dtlb_cache_stats[NUM_CTX][MAX_NR_CPUS];
>  static struct stats runtime_cycles_in_tx_stats[NUM_CTX][MAX_NR_CPUS];
>  static struct stats runtime_transaction_stats[NUM_CTX][MAX_NR_CPUS];
>  static struct stats runtime_elision_stats[NUM_CTX][MAX_NR_CPUS];
> +static struct stats runtime_topdown_total_slots[NUM_CTX][MAX_NR_CPUS];
> +static struct stats runtime_topdown_slots_issued[NUM_CTX][MAX_NR_CPUS];
> +static struct stats runtime_topdown_slots_retired[NUM_CTX][MAX_NR_CPUS];
> +static struct stats runtime_topdown_fetch_bubbles[NUM_CTX][MAX_NR_CPUS];
> +static struct stats runtime_topdown_recovery_bubbles[NUM_CTX][MAX_NR_CPUS];
>  static bool have_frontend_stalled;
>  
>  struct stats walltime_nsecs_stats;
> @@ -82,6 +87,12 @@ void perf_stat__reset_shadow_stats(void)
>  		sizeof(runtime_transaction_stats));
>  	memset(runtime_elision_stats, 0, sizeof(runtime_elision_stats));
>  	memset(&walltime_nsecs_stats, 0, sizeof(walltime_nsecs_stats));
> +	memset(runtime_topdown_total_slots, 0, sizeof(runtime_topdown_total_slots));
> +	memset(runtime_topdown_slots_retired, 0, sizeof(runtime_topdown_slots_retired));
> +	memset(runtime_topdown_slots_issued, 0, sizeof(runtime_topdown_slots_issued));
> +	memset(runtime_topdown_fetch_bubbles, 0, sizeof(runtime_topdown_fetch_bubbles));
> +	memset(runtime_topdown_recovery_bubbles, 0, sizeof(runtime_topdown_recovery_bubbles));
> +	have_frontend_stalled = pmu_have_event("cpu", "stalled-cycles-frontend");

why to initialize this one in here? it's already in perf_stat__init_shadow_stats

jirka