linux-kernel - Re: [PATCH v2 1/2] perf tools: add evsel prev_raw

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Date:	Fri, 18 Jan 2013 14:49:07 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung.kim@....com
Subject: Re: [PATCH v2 1/2] perf tools: add evsel prev_raw_count field

On Fri, Jan 18, 2013 at 02:06:27PM +0100, Stephane Eranian wrote:
> This field will be used by commands which print
> counter deltas on regular timer intervals,
> such as perf stat -I.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>  tools/perf/util/evsel.c |   21 +++++++++++++++++++++
>  tools/perf/util/evsel.h |    1 +
>  2 files changed, 22 insertions(+)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 1b16dd1..132da7c 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -646,6 +646,17 @@ int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
>  	if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
>  		return -errno;
>  
> +	if (evsel->prev_raw_counts) {
> +		struct perf_counts_values tmp;
> +
> +		tmp = evsel->prev_raw_counts->cpu[cpu];
> +		evsel->prev_raw_counts->cpu[cpu] = count;
> +
> +		count.val = count.val - tmp.val;
> +		count.ena = count.ena - tmp.ena;
> +		count.run = count.run - tmp.run;
> +	}
> +
>  	if (scale) {
>  		if (count.run == 0)
>  			count.val = 0;
> @@ -684,6 +695,16 @@ int __perf_evsel__read(struct perf_evsel *evsel,
>  		}
>  	}
>  
> +	if (evsel->prev_raw_counts) {
> +		struct perf_counts_values tmp = evsel->prev_raw_counts->aggr;
> +
> +		evsel->prev_raw_counts->aggr = *aggr;
> +
> +		aggr->val = aggr->val - tmp.val;
> +		aggr->ena = aggr->ena - tmp.ena;
> +		aggr->run = aggr->run - tmp.run;
> +	}

this and the hunk above looks like candidates for function

jirka
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