linux-kernel - Re: [PATCH v2 07/11] perf vendor events: add support for arch standard events

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Date:   Tue, 27 Feb 2018 09:58:46 +0000
From:   John Garry <john.garry@...wei.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     <ak@...ux.intel.com>, <peterz@...radead.org>, <mingo@...hat.com>,
        <acme@...nel.org>, <alexander.shishkin@...ux.intel.com>,
        <namhyung@...nel.org>, <wcohen@...hat.com>, <will.deacon@....com>,
        <ganapatrao.kulkarni@...ium.com>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <zhangshaokun@...ilicon.com>
Subject: Re: [PATCH v2 07/11] perf vendor events: add support for arch
 standard events

On 27/02/2018 09:48, Jiri Olsa wrote:
> On Sat, Feb 24, 2018 at 12:05:28AM +0800, John Garry wrote:
>
> SNIP
>
>> +static int save_arch_std_events(void *data, char *name, char *event,
>> +				char *desc, char *long_desc, char *pmu,
>> +				char *unit, char *perpkg, char *metric_expr,
>> +				char *metric_name, char *metric_group)
>> +{
>> +	struct event_struct *es;
>> +	struct stat *sb = data;
>> +
>> +	es = malloc(sizeof(*es));
>> +	if (!es)
>> +		return -ENOMEM;
>> +	memset(es, 0, sizeof(*es));
>> +	FOR_ALL_EVENT_STRUCT_FIELDS(ADD_EVENT_FIELD);
>> +	list_add_tail(&es->list, &arch_std_events);
>> +	return 0;
>> +out_free:
>> +	FOR_ALL_EVENT_STRUCT_FIELDS(FREE_EVENT_FIELD);
>> +	free(es);
>> +	return -ENOMEM;
>> +}
>> +
>>  static void print_events_table_suffix(FILE *outfp)
>>  {
>>  	fprintf(outfp, "{\n");
>> @@ -391,6 +469,27 @@ static char *real_event(const char *name, char *event)
>>  	return event;
>>  }
>>
>> +static int
>> +try_fixup(const char *fn, char *arch_std, char **event, char **desc,
>> +	  char **name, char **long_desc, char **pmu, char **filter,
>> +	  char **perpkg, char **unit, char **metric_expr, char **metric_name,
>> +	  char **metric_group)
>> +{
>> +	/* try to find matching event from arch standard values */
>> +	struct event_struct *es;
>> +
>> +	list_for_each_entry(es, &arch_std_events, list) {
>> +		if (!strcmp(arch_std, es->event+sizeof(EVENT_PREFIX))) {
>
> I spent some time figuring out how this can work when there's on '=' in EVENT_PREFIX
> is this because sizeof returns +1 size for NULL char also?

Right, sizeof(EVENT_PREFIX)=6 strlen(EVENT_PREFIX)=5

EVENT_PREFIX is "event"

Thank you,
John

>
> thanks,
> jirka
>
> .
>