linux-kernel - Re: [PATCH v1 1/2] perf header: Support HYBRID

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Date:   Tue, 4 May 2021 16:54:03 +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 v1 1/2] perf header: Support HYBRID_TOPOLOGY feature

On Fri, Apr 30, 2021 at 03:46:01PM +0800, Jin Yao wrote:

SNIP

> +static int write_hybrid_topology(struct feat_fd *ff,
> +				 struct evlist *evlist __maybe_unused)
> +{
> +	struct hybrid_topology *tp;
> +	int ret;
> +	u32 i;
> +
> +	tp = hybrid_topology__new();
> +	if (!tp)
> +		return -1;
> +
> +	ret = do_write(ff, &tp->nr, sizeof(u32));
> +	if (ret < 0)
> +		goto err;
> +
> +	for (i = 0; i < tp->nr; i++) {
> +		struct hybrid_topology_node *n = &tp->nodes[i];
> +
> +		ret = do_write_string(ff, n->pmu_name);
> +		if (ret < 0)
> +			goto err;
> +
> +		ret = do_write_string(ff, n->cpus);
> +		if (ret < 0)
> +			goto err;
> +	}
> +
> +	ret = 0;
> +
> +err:
> +	hybrid_topology__delete(tp);
> +	return ret;
> +}
> +
>  static int write_dir_format(struct feat_fd *ff,
>  			    struct evlist *evlist __maybe_unused)
>  {
> @@ -1623,6 +1657,19 @@ static void print_clock_data(struct feat_fd *ff, FILE *fp)
>  		    clockid_name(clockid));
>  }
>  
> +static void print_hybrid_topology(struct feat_fd *ff, FILE *fp)
> +{
> +	int i;
> +	struct hybrid_node *n;
> +
> +	for (i = 0; i < ff->ph->env.nr_hybrid_nodes; i++) {
> +		n = &ff->ph->env.hybrid_nodes[i];
> +
> +		fprintf(fp, "# %s cpu list : ", n->pmu_name);
> +		cpu_map__fprintf(n->map, fp);

do you plan to do anything else with n->map in the future?
because right now you could just print the stored cpus string no?
it should be already in the cpumask shape

jirka