linux-kernel - Re: [PATCH 03/10] Use pmu_events_map table to create event aliases

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Message-ID: <20150528124612.GM12392@krava.redhat.com>
Date:	Thu, 28 May 2015 14:46:12 +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>,
	Paul Mackerras <paulus@...ba.org>, namhyung@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/10] Use pmu_events_map table to create event aliases

On Wed, May 27, 2015 at 02:23:22PM -0700, Sukadev Bhattiprolu wrote:
> At run time, (i.e when perf is starting up), locate the specific events
> table for the current CPU and create event aliases for each of the events.
> 
> Use these aliases to parse user's specified perf event.
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>

please prefix the subject with 'perf tools'

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)
> +{
> +	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)
> +			return 0;

leaking cpuid

> +
> +		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);
> +	}
> +
> +	free(cpuid);
> +
> +	return 0;
> +}

SNIP
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