linux-kernel - Re: [RFC] perf/jevents: Add new structure to pass json fields.

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Date:   Wed, 26 Aug 2020 12:56:56 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Kajol Jain <kjain@...ux.ibm.com>
Cc:     acme@...nel.org, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        irogers@...gle.com, maddy@...ux.ibm.com,
        ravi.bangoria@...ux.ibm.com
Subject: Re: [RFC] perf/jevents: Add new structure to pass json fields.

On Tue, Aug 25, 2020 at 01:10:41PM +0530, Kajol Jain wrote:

SNIP

>  {
>  	/* try to find matching event from arch standard values */
>  	struct event_struct *es;
> @@ -498,8 +486,7 @@ try_fixup(const char *fn, char *arch_std, char **event, char **desc,
>  		if (!strcmp(arch_std, es->name)) {
>  			if (!eventcode && es->event) {
>  				/* allow EventCode to be overridden */
> -				free(*event);
> -				*event = NULL;
> +				je->event = NULL;
>  			}
>  			FOR_ALL_EVENT_STRUCT_FIELDS(TRY_FIXUP_FIELD);
>  			return 0;
> @@ -513,13 +500,8 @@ try_fixup(const char *fn, char *arch_std, char **event, char **desc,
>  
>  /* Call func with each event in the json file */
>  int json_events(const char *fn,
> -	  int (*func)(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,
> -		      char *deprecated, char *metric_constraint),
> -	  void *data)
> +		int (*func)(void *data, struct json_event *je),
> +			void *data)
>  {
>  	int err;
>  	size_t size;
> @@ -537,24 +519,16 @@ int json_events(const char *fn,
>  	EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
>  	tok = tokens + 1;
>  	for (i = 0; i < tokens->size; i++) {
> -		char *event = NULL, *desc = NULL, *name = NULL;
> -		char *long_desc = NULL;
>  		char *extra_desc = NULL;
> -		char *pmu = NULL;
>  		char *filter = NULL;
> -		char *perpkg = NULL;
> -		char *unit = NULL;
> -		char *metric_expr = NULL;
> -		char *metric_name = NULL;
> -		char *metric_group = NULL;
> -		char *deprecated = NULL;
> -		char *metric_constraint = NULL;
> +		struct json_event *je;
>  		char *arch_std = NULL;
>  		unsigned long long eventcode = 0;
>  		struct msrmap *msr = NULL;
>  		jsmntok_t *msrval = NULL;
>  		jsmntok_t *precise = NULL;
>  		jsmntok_t *obj = tok++;
> +		je = (struct json_event *)calloc(1, sizeof(struct json_event));

hum, you don't check je pointer in here.. but does it need to be allocated?
looks like you could just have je on stack as well..

thanks,
jirka