linux-kernel - Re: [RFC PATCH] tools lib traceevent: Allow setting an alternative symbol resolver

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Date:	Thu, 23 Jul 2015 14:10:39 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] tools lib traceevent: Allow setting an alternative
 symbol resolver

On Thu, 23 Jul 2015 14:25:54 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index cc25f059ab3d..2750e7e7efff 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -418,7 +418,7 @@ static int func_map_init(struct pevent *pevent)
>  }
>  
>  static struct func_map *
> -find_func(struct pevent *pevent, unsigned long long addr)
> +__find_func(struct pevent *pevent, unsigned long long addr)
>  {
>  	struct func_map *func;
>  	struct func_map key;
> @@ -434,6 +434,51 @@ find_func(struct pevent *pevent, unsigned long long addr)
>  	return func;
>  }
>  
> +static struct {
> +	pevent_function_resolver_t *function;
> +	void 			   *priv;
> +} function_resolver;
> +
> +/**
> + * pevent_set_function_resolver - set an alternative function resolver
> + * @resolver - function to be used
> + * @priv - resolver function private state.
> + *
> + * Some tools may have already a way to resolve kernel functions, allow them
> + * to keep using it instead of duplicating all the entries inside pevent->funclist.
> + */
> +void pevent_set_function_resolver(pevent_function_resolver_t *resolver, void *priv)
> +{
> +	function_resolver.function = resolver;
> +	function_resolver.priv	  = priv;

What about passing in pevent, and making the allocation here?

-- Steve

> +}
> +
> +static struct func_map *
> +find_func(struct pevent *pevent, unsigned long long addr)
> +{
> +	struct func_map *map;
> +
> +	if (!function_resolver.function)
> +		return __find_func(pevent, addr);
> +
> +	if (pevent->func_map_resolver == NULL) {
> +		pevent->func_map_resolver = malloc(sizeof(*map));
> +		if (pevent->func_map_resolver == NULL) {
> +			do_warning("Not enough memory for resolving addresses to functions!\n");
> +			return NULL;
> +		}
> +	}
> +
> +	map = pevent->func_map_resolver;
> +	map->mod  = NULL;
> +	map->addr = addr;
> +	map->func = function_resolver.function(function_resolver.priv, &map->addr, &map->mod);
> +	if (map->func == NULL)
> +		return NULL;
> +
> +	return map;
> +}
> +
>  /**
>   * pevent_find_function - find a function by a given address
>   * @pevent: handle for the pevent
> @@ -6564,6 +6609,7 @@ void pevent_free(struct pevent *pevent)
>  	free(pevent->trace_clock);
>  	free(pevent->events);
>  	free(pevent->sort_events);
> +	free(pevent->func_map_resolver);
>  
>  	free(pevent);
>  }
> diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
> index 063b1971eb35..6bd526f0d17a 100644
> --- a/tools/lib/traceevent/event-parse.h
> +++ b/tools/lib/traceevent/event-parse.h
> @@ -481,6 +481,7 @@ struct pevent {
>  	int cmdline_count;
>  
>  	struct func_map *func_map;
> +	struct func_map *func_map_resolver;
>  	struct func_list *funclist;
>  	unsigned int func_count;
>  
> @@ -611,6 +612,10 @@ enum trace_flag_type {
>  	TRACE_FLAG_SOFTIRQ		= 0x10,
>  };
>  
> +typedef char *(pevent_function_resolver_t)(void *priv, unsigned long long *addrp, char **modp);
> +
> +void pevent_set_function_resolver(pevent_function_resolver_t *resolver, void *priv);
> +
>  int pevent_register_comm(struct pevent *pevent, const char *comm, int pid);
>  int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock);
>  int pevent_register_function(struct pevent *pevent, char *name,
> 

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