linux-kernel - Re: [PATCH v2 04/10] perf util: Add rbtree node

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Date:   Tue, 28 Nov 2017 12:12:22 +0100
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 04/10] perf util: Add rbtree node_delete ops

On Mon, Nov 27, 2017 at 10:07:24PM +0800, Jin Yao wrote:

SNIP

> @@ -124,13 +137,25 @@ static struct saved_value *saved_value_lookup(struct perf_evsel *evsel,
>  	return NULL;
>  }
>  
> +void runtime_stat__init(struct runtime_stat *stat)
> +{
> +	struct rblist *rblist = &stat->value_list;
> +
> +	rblist__init(rblist);
> +	rblist->node_cmp = saved_value_cmp;
> +	rblist->node_new = saved_value_new;
> +	rblist->node_delete = saved_value_delete;
> +}
> +
> +void runtime_stat__free(struct runtime_stat *stat)
> +{
> +	rblist__reset(&stat->value_list);
> +}
> +
>  void perf_stat__init_shadow_stats(void)
>  {
>  	have_frontend_stalled = pmu_have_event("cpu", "stalled-cycles-frontend");
> -	rblist__init(&runtime_saved_values);
> -	runtime_saved_values.node_cmp = saved_value_cmp;
> -	runtime_saved_values.node_new = saved_value_new;
> -	/* No delete for now */

hum, you should you remove this at the switching point
to keep it bisectable.. now it crashes:

[jolsa@...va perf]$ sudo ./perf stat -M Summary --metric-only -a sleep 1
Segmentation fault


jirka