linux-kernel - Re: [PATCH v13 03/14] perf, tools: Use pmu_events

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Message-ID: <20150603103033.GB1828@krava.redhat.com>
Date:	Wed, 3 Jun 2015 12:30:33 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	mingo@...hat.com, ak@...ux.intel.com,
	Michael Ellerman <mpe@...erman.id.au>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	namhyung@...nel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v13 03/14] perf, tools: Use pmu_events_map table to
 create event aliases

On Tue, Jun 02, 2015 at 10:12:03AM -0700, Sukadev Bhattiprolu wrote:

SNIP

> +
> +/*
> + * From the pmu_events_map, find the table of PMU events that corresponds
> + * to the current running CPU. Then, add all PMU events from that table
> + * as aliases.
> + */
> +static int pmu_add_cpu_aliases(void *data)

any reason why the argument is not 'head' directly?

jirka

> +{
> +	struct list_head *head = (struct list_head *)data;
> +	int i;
> +	struct pmu_events_map *map;
> +	struct pmu_event *pe;
> +	char *cpuid;
> +
> +	cpuid = get_cpuid_str();
> +	if (!cpuid)
> +		return 0;
> +
> +	i = 0;
> +	while (1) {
> +		map = &pmu_events_map[i++];
> +		if (!map->table) {
> +			goto out;
> +		}
> +
> +		if (!strcmp(map->cpuid, cpuid))
> +			break;
> +	}
> +
> +	/*
> +	 * Found a matching PMU events table. Create aliases
> +	 */
> +	i = 0;
> +	while (1) {
> +		pe = &map->table[i++];
> +		if (!pe->name)
> +			break;
> +
> +		/* need type casts to override 'const' */
> +		__perf_pmu__new_alias(head, (char *)pe->name, NULL,
> +				(char *)pe->desc, (char *)pe->event);
> +	}
> +
> +out:
> +	free(cpuid);
> +	return 0;
> +}
> +
> +
>  static struct perf_pmu *pmu_lookup(const char *name)
>  {
>  	struct perf_pmu *pmu;
> @@ -464,6 +540,8 @@ static struct perf_pmu *pmu_lookup(const char *name)
>  	if (pmu_aliases(name, &aliases))
>  		return NULL;
>  
> +	if (!strcmp(name, "cpu"))
> +		(void)pmu_add_cpu_aliases(&aliases);
>  	if (pmu_type(name, &type))
>  		return NULL;
>  
> -- 
> 1.7.9.5
> 
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