linux-kernel - Re: [PATCH 1/3] perf header: Add die information in CPU topology

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Date:   Tue, 28 May 2019 11:00:07 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     kan.liang@...ux.intel.com
Cc:     acme@...nel.org, jolsa@...nel.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        ak@...ux.intel.com
Subject: Re: [PATCH 1/3] perf header: Add die information in CPU topology

On Thu, May 23, 2019 at 01:41:19PM -0700, kan.liang@...ux.intel.com wrote:

SNIP

>  	if (sret <= 0)
> -		goto try_threads;
> +		goto try_dies;
>  
>  	p = strchr(buf, '\n');
>  	if (p)
> @@ -57,6 +78,35 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
>  	}
>  	ret = 0;
>  
> +try_dies:
> +	if (has_die) {

less depth..

	if (!has_die())
		goto try_threads;


	scnprintf(filename, MAXPATHLEN, DIE_SIB_FMT,
		  sysfs__mountpoint(), cpu);
	...

> +		scnprintf(filename, MAXPATHLEN, DIE_SIB_FMT,
> +			  sysfs__mountpoint(), cpu);
> +		fp = fopen(filename, "r");
> +		if (!fp)
> +			goto try_threads;
> +
> +		sret = getline(&buf, &len, fp);
> +		fclose(fp);
> +		if (sret <= 0)
> +			goto try_threads;
> +
> +		p = strchr(buf, '\n');
> +		if (p)
> +			*p = '\0';
> +
> +		for (i = 0; i < tp->die_sib; i++) {
> +			if (!strcmp(buf, tp->die_siblings[i]))
> +				break;
> +		}
> +		if (i == tp->die_sib) {
> +			tp->die_siblings[i] = buf;
> +			tp->die_sib++;
> +			buf = NULL;
> +			len = 0;
> +		}
> +		ret = 0;
> +	}
>  try_threads:
>  	scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,

SNIP