linux-kernel - Re: [PATCH v5 03/12] perf util: Extend rbtree to support shadow stats

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Date:   Fri, 1 Dec 2017 11:10:01 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     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 v5 03/12] perf util: Extend rbtree to support shadow stats

Em Fri, Dec 01, 2017 at 06:57:27PM +0800, Jin Yao escreveu:
> Previously the rbtree was used to link generic metrics.

Try to make the one line subject more descriptive, I'm changing it to:

perf stat: Extend rbtree to support per-thread shadow stats

- Arnaldo
 
> This patches adds new ctx/type/stat into rbtree keys because we
> will use this rbtree to maintain shadow metrics to replace original
> a couple of static arrays for supporting per-thread shadow stats.
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/util/stat-shadow.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> index 5853901..c53b80d 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -45,7 +45,10 @@ struct stats walltime_nsecs_stats;
>  struct saved_value {
>  	struct rb_node rb_node;
>  	struct perf_evsel *evsel;
> +	enum stat_type type;
> +	int ctx;
>  	int cpu;
> +	struct runtime_stat *stat;
>  	struct stats stats;
>  };
>  
> @@ -58,6 +61,30 @@ static int saved_value_cmp(struct rb_node *rb_node, const void *entry)
>  
>  	if (a->cpu != b->cpu)
>  		return a->cpu - b->cpu;
> +
> +	/*
> +	 * Previously the rbtree was used to link generic metrics.
> +	 * The keys were evsel/cpu. Now the rbtree is extended to support
> +	 * per-thread shadow stats. For shadow stats case, the keys
> +	 * are cpu/type/ctx/stat (evsel is NULL). For generic metrics
> +	 * case, the keys are still evsel/cpu (type/ctx/stat are 0 or NULL).
> +	 */
> +	if (a->type != b->type)
> +		return a->type - b->type;
> +
> +	if (a->ctx != b->ctx)
> +		return a->ctx - b->ctx;
> +
> +	if (a->evsel == NULL && b->evsel == NULL) {
> +		if (a->stat == b->stat)
> +			return 0;
> +
> +		if ((char *)a->stat < (char *)b->stat)
> +			return -1;
> +
> +		return 1;
> +	}
> +
>  	if (a->evsel == b->evsel)
>  		return 0;
>  	if ((char *)a->evsel < (char *)b->evsel)
> -- 
> 2.7.4