linux-kernel - Re: [PATCH 04/11] perf stat: Use perf_evsel__read_cb in read

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Message-ID: <20141124203533.GB12236@redhat.com>
Date:	Mon, 24 Nov 2014 18:35:33 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 04/11] perf stat: Use perf_evsel__read_cb in read_counter

Em Fri, Nov 21, 2014 at 10:31:08AM +0100, Jiri Olsa escreveu:
> Replacing __perf_evsel__read_on_cpu function with perf_evsel__read_cb
> function. The read_cb callback will be used later for global aggregation
> counter values as well.

But the changeset makes it look like there are no changes made... Can
you elaborate here?
 
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-stat.c | 27 +++++++++++++++++++++------
>  1 file changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 055ce9232c9e..9cc0db1d7f06 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -388,6 +388,26 @@ static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
>  		update_stats(&runtime_itlb_cache_stats[0], count[0]);
>  }
>  
> +static int read_cb(struct perf_evsel *evsel, int cpu, int thread __maybe_unused,
> +		   struct perf_counts_values *count)
> +{
> +	switch (aggr_mode) {
> +	case AGGR_CORE:
> +	case AGGR_SOCKET:
> +	case AGGR_NONE:
> +		perf_evsel__compute_deltas(evsel, cpu, count);
> +		perf_counts_values__scale(count, scale, NULL);
> +		evsel->counts->cpu[cpu] = *count;
> +		update_shadow_stats(evsel, count->values);
> +		break;
> +	case AGGR_GLOBAL:
> +	default:
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
>  /*
>   * Read out the results of a single counter:
>   * aggregate counts across CPUs in system-wide mode
> @@ -424,16 +444,11 @@ static int read_counter_aggr(struct perf_evsel *counter)
>   */
>  static int read_counter(struct perf_evsel *counter)
>  {
> -	u64 *count;
>  	int cpu;
>  
>  	for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
> -		if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
> +		if (perf_evsel__read_cb(counter, cpu, 0, read_cb))
>  			return -1;
> -
> -		count = counter->counts->cpu[cpu].values;
> -
> -		update_shadow_stats(counter, count);
>  	}
>  
>  	return 0;
> -- 
> 1.9.3
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