linux-kernel - Re: [PATCH v3 6/8] perf/tools: Enhance JSON/metric infrastructure to handle "?"

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Message-ID: <20200302150819.GA259142@krava>
Date:   Mon, 2 Mar 2020 16:08:19 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Kajol Jain <kjain@...ux.ibm.com>
Cc:     acme@...nel.org, linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au,
        sukadev@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, anju@...ux.vnet.ibm.com,
        maddy@...ux.vnet.ibm.com, ravi.bangoria@...ux.ibm.com,
        peterz@...radead.org, yao.jin@...ux.intel.com, ak@...ux.intel.com,
        jolsa@...nel.org, kan.liang@...ux.intel.com, jmario@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        paulus@...abs.org, namhyung@...nel.org, mpetlan@...hat.com,
        gregkh@...uxfoundation.org, benh@...nel.crashing.org,
        mamatha4@...ux.vnet.ibm.com, mark.rutland@....com,
        tglx@...utronix.de
Subject: Re: [PATCH v3 6/8] perf/tools: Enhance JSON/metric infrastructure to
 handle "?"

On Sat, Feb 29, 2020 at 03:11:57PM +0530, Kajol Jain wrote:

SNIP

>  #define PVR_VER(pvr)    (((pvr) >>  16) & 0xFFFF) /* Version field */
>  #define PVR_REV(pvr)    (((pvr) >>   0) & 0xFFFF) /* Revison field */
>  
> +#define SOCKETS_INFO_FILE_PATH "/devices/hv_24x7/interface/"
> +
>  int
>  get_cpuid(char *buffer, size_t sz)
>  {
> @@ -44,3 +51,43 @@ get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
>  
>  	return bufp;
>  }
> +
> +int arch_get_runtimeparam(void)
> +{
> +	int count = 0;
> +	DIR *dir;
> +	char path[PATH_MAX];
> +	const char *sysfs = sysfs__mountpoint();
> +	char filename[] = "sockets";
> +	FILE *file;
> +	char buf[16], *num;
> +	int data;
> +
> +	if (!sysfs)
> +		goto out;
> +
> +	snprintf(path, PATH_MAX,
> +		 "%s" SOCKETS_INFO_FILE_PATH, sysfs);
> +	dir = opendir(path);
> +
> +	if (!dir)
> +		goto out;
> +
> +	strcat(path, filename);
> +	file = fopen(path, "r");
> +
> +	if (!file)
> +		goto out;
> +
> +	data = fread(buf, 1, sizeof(buf), file);
> +
> +	if (data == 0)
> +		goto out;
> +
> +	count = strtol(buf, &num, 10);
> +out:
> +	if (!count)
> +		count = 1;
> +
> +	return count;

we have sysfs__read_ull for this

jirka