linux-kernel - Re: [PATCH v2] perf diff: Report noisy for cycles diff

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Date:   Tue, 6 Aug 2019 10:34:13 +0200
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 v2] perf diff: Report noisy for cycles diff

On Thu, Jul 25, 2019 at 06:14:32AM +0800, Jin Yao wrote:

SNIP

> +}
> +
>  double avg_stats(struct stats *stats)
>  {
>  	return stats->mean;
> diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
> index 95b4de7a9d51..3448d319a220 100644
> --- a/tools/perf/util/stat.h
> +++ b/tools/perf/util/stat.h
> @@ -8,14 +8,18 @@
>  #include <sys/time.h>
>  #include <sys/resource.h>
>  #include <sys/wait.h>
> +#include <stdio.h>
>  #include "xyarray.h"
>  #include "rblist.h"
>  #include "perf.h"
>  #include "event.h"
>  
> +#define NUM_SPARK_VALS	8 /* support spark line on first N items */
> +
>  struct stats {
>  	double n, mean, M2;
>  	u64 max, min;
> +	unsigned long svals[NUM_SPARK_VALS];
>  };

please do it without changing the 'struct stats', it's all
over the place and diff would be the only user

thanks
jirka