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Commit c5cd8ac0 authored by David Ahern's avatar David Ahern Committed by Arnaldo Carvalho de Melo
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perf parse events: Demystify memory allocations 



List heads are currently allocated way down the function chain in
__add_event and add_tracepoint and then freed when the scanner code
calls parse_events_update_lists.

Be more explicit with where memory is allocated and who should free it. With
this patch the list_head is allocated in the scanner code and freed when the
scanner code calls parse_events_update_lists.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1372793245-4136-7-git-send-email-dsahern@gmail.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent c549aca5

tools/perf/util/parse-events.c

+16 −36
Original line number Diff line number Diff line
@@ -264,40 +264,29 @@ const char *event_type(int type) 






static int __add_event(struct list_head **_list, int *idx,

static int __add_event(struct list_head *list, int *idx,

		       struct perf_event_attr *attr,

		       char *name, struct cpu_map *cpus)

{

	struct perf_evsel *evsel;

	struct list_head *list = *_list;



	if (!list) {

		list = malloc(sizeof(*list));

		if (!list)

			return -ENOMEM;

		INIT_LIST_HEAD(list);

	}



	event_attr_init(attr);



	evsel = perf_evsel__new(attr, (*idx)++);

	if (!evsel) {

		free(list);

	if (!evsel)

		return -ENOMEM;

	}



	evsel->cpus = cpus;

	if (name)

		evsel->name = strdup(name);

	list_add_tail(&evsel->node, list);

	*_list = list;

	return 0;

}



static int add_event(struct list_head **_list, int *idx,

static int add_event(struct list_head *list, int *idx,

		     struct perf_event_attr *attr, char *name)

{

	return __add_event(_list, idx, attr, name, NULL);

	return __add_event(list, idx, attr, name, NULL);

}



static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES], int size)
@@ -318,7 +307,7 @@ static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES] 
	return -1;

}



int parse_events_add_cache(struct list_head **list, int *idx,

int parse_events_add_cache(struct list_head *list, int *idx,

			   char *type, char *op_result1, char *op_result2)

{

	struct perf_event_attr attr;
@@ -379,31 +368,21 @@ int parse_events_add_cache(struct list_head **list, int *idx, 
	return add_event(list, idx, &attr, name);

}



static int add_tracepoint(struct list_head **listp, int *idx,

static int add_tracepoint(struct list_head *list, int *idx,

			  char *sys_name, char *evt_name)

{

	struct perf_evsel *evsel;

	struct list_head *list = *listp;



	if (!list) {

		list = malloc(sizeof(*list));

		if (!list)

			return -ENOMEM;

		INIT_LIST_HEAD(list);

	}



	evsel = perf_evsel__newtp(sys_name, evt_name, (*idx)++);

	if (!evsel) {

		free(list);

	if (!evsel)

		return -ENOMEM;

	}



	list_add_tail(&evsel->node, list);

	*listp = list;



	return 0;

}



static int add_tracepoint_multi_event(struct list_head **list, int *idx,

static int add_tracepoint_multi_event(struct list_head *list, int *idx,

				      char *sys_name, char *evt_name)

{

	char evt_path[MAXPATHLEN];
@@ -435,7 +414,7 @@ static int add_tracepoint_multi_event(struct list_head **list, int *idx, 
	return ret;

}



static int add_tracepoint_event(struct list_head **list, int *idx,

static int add_tracepoint_event(struct list_head *list, int *idx,

				char *sys_name, char *evt_name)

{

	return strpbrk(evt_name, "*?") ?
@@ -443,7 +422,7 @@ static int add_tracepoint_event(struct list_head **list, int *idx, 
	       add_tracepoint(list, idx, sys_name, evt_name);

}



static int add_tracepoint_multi_sys(struct list_head **list, int *idx,

static int add_tracepoint_multi_sys(struct list_head *list, int *idx,

				    char *sys_name, char *evt_name)

{

	struct dirent *events_ent;
@@ -475,7 +454,7 @@ static int add_tracepoint_multi_sys(struct list_head **list, int *idx, 
	return ret;

}



int parse_events_add_tracepoint(struct list_head **list, int *idx,

int parse_events_add_tracepoint(struct list_head *list, int *idx,

				char *sys, char *event)

{

	int ret;
@@ -530,7 +509,7 @@ do { \ 
	return 0;

}



int parse_events_add_breakpoint(struct list_head **list, int *idx,

int parse_events_add_breakpoint(struct list_head *list, int *idx,

				void *ptr, char *type)

{

	struct perf_event_attr attr;
@@ -611,7 +590,7 @@ static int config_attr(struct perf_event_attr *attr, 
	return 0;

}



int parse_events_add_numeric(struct list_head **list, int *idx,

int parse_events_add_numeric(struct list_head *list, int *idx,

			     u32 type, u64 config,

			     struct list_head *head_config)

{
@@ -644,7 +623,7 @@ static char *pmu_event_name(struct list_head *head_terms) 
	return NULL;

}



int parse_events_add_pmu(struct list_head **list, int *idx,

int parse_events_add_pmu(struct list_head *list, int *idx,

			 char *name, struct list_head *head_config)

{

	struct perf_event_attr attr;
@@ -687,6 +666,7 @@ void parse_events__set_leader(char *name, struct list_head *list) 
	leader->group_name = name ? strdup(name) : NULL;

}



/* list_event is assumed to point to malloc'ed memory */

void parse_events_update_lists(struct list_head *list_event,

			       struct list_head *list_all)

{

tools/perf/util/parse-events.h

+5 −5
Original line number Diff line number Diff line
@@ -85,16 +85,16 @@ void parse_events__free_terms(struct list_head *terms); 
int parse_events__modifier_event(struct list_head *list, char *str, bool add);

int parse_events__modifier_group(struct list_head *list, char *event_mod);

int parse_events_name(struct list_head *list, char *name);

int parse_events_add_tracepoint(struct list_head **list, int *idx,

int parse_events_add_tracepoint(struct list_head *list, int *idx,

				char *sys, char *event);

int parse_events_add_numeric(struct list_head **list, int *idx,

int parse_events_add_numeric(struct list_head *list, int *idx,

			     u32 type, u64 config,

			     struct list_head *head_config);

int parse_events_add_cache(struct list_head **list, int *idx,

int parse_events_add_cache(struct list_head *list, int *idx,

			   char *type, char *op_result1, char *op_result2);

int parse_events_add_breakpoint(struct list_head **list, int *idx,

int parse_events_add_breakpoint(struct list_head *list, int *idx,

				void *ptr, char *type);

int parse_events_add_pmu(struct list_head **list, int *idx,

int parse_events_add_pmu(struct list_head *list, int *idx,

			 char *pmu , struct list_head *head_config);

void parse_events__set_leader(char *name, struct list_head *list);

void parse_events_update_lists(struct list_head *list_event,

tools/perf/util/parse-events.y

+40 −22
Original line number Diff line number Diff line
@@ -22,6 +22,13 @@ do { \ 
		YYABORT; \

} while (0)



#define ALLOC_LIST(list) \

do { \

	list = malloc(sizeof(*list)); \

	ABORT_ON(!list);              \

	INIT_LIST_HEAD(list);         \

} while (0)



static inc_group_count(struct list_head *list,

		       struct parse_events_evlist *data)

{
@@ -196,9 +203,10 @@ event_pmu: 
PE_NAME '/' event_config '/'

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_pmu(&list, &data->idx, $1, $3));

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_pmu(list, &data->idx, $1, $3));

	parse_events__free_terms($3);

	$$ = list;

}
@@ -212,11 +220,12 @@ event_legacy_symbol: 
value_sym '/' event_config '/'

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;

	int type = $1 >> 16;

	int config = $1 & 255;



	ABORT_ON(parse_events_add_numeric(&list, &data->idx,

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_numeric(list, &data->idx,

					  type, config, $3));

	parse_events__free_terms($3);

	$$ = list;
@@ -225,11 +234,12 @@ value_sym '/' event_config '/' 
value_sym sep_slash_dc

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;

	int type = $1 >> 16;

	int config = $1 & 255;



	ABORT_ON(parse_events_add_numeric(&list, &data->idx,

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_numeric(list, &data->idx,

					  type, config, NULL));

	$$ = list;

}
@@ -238,27 +248,30 @@ event_legacy_cache: 
PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT '-' PE_NAME_CACHE_OP_RESULT

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_cache(&list, &data->idx, $1, $3, $5));

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_cache(list, &data->idx, $1, $3, $5));

	$$ = list;

}

|

PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_cache(&list, &data->idx, $1, $3, NULL));

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_cache(list, &data->idx, $1, $3, NULL));

	$$ = list;

}

|

PE_NAME_CACHE_TYPE

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_cache(&list, &data->idx, $1, NULL, NULL));

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_cache(list, &data->idx, $1, NULL, NULL));

	$$ = list;

}
@@ -266,9 +279,10 @@ event_legacy_mem: 
PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_breakpoint(&list, &data->idx,

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_breakpoint(list, &data->idx,

					     (void *) $2, $4));

	$$ = list;

}
@@ -276,9 +290,10 @@ PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc 
PE_PREFIX_MEM PE_VALUE sep_dc

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_breakpoint(&list, &data->idx,

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_breakpoint(list, &data->idx,

					     (void *) $2, NULL));

	$$ = list;

}
@@ -287,9 +302,10 @@ event_legacy_tracepoint: 
PE_NAME ':' PE_NAME

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_tracepoint(&list, &data->idx, $1, $3));

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_tracepoint(list, &data->idx, $1, $3));

	$$ = list;

}
@@ -297,9 +313,10 @@ event_legacy_numeric: 
PE_VALUE ':' PE_VALUE

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_numeric(&list, &data->idx, (u32)$1, $3, NULL));

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_numeric(list, &data->idx, (u32)$1, $3, NULL));

	$$ = list;

}
@@ -307,9 +324,10 @@ event_legacy_raw: 
PE_RAW

{

	struct parse_events_evlist *data = _data;

	struct list_head *list = NULL;

	struct list_head *list;



	ABORT_ON(parse_events_add_numeric(&list, &data->idx,

	ALLOC_LIST(list);

	ABORT_ON(parse_events_add_numeric(list, &data->idx,

					  PERF_TYPE_RAW, $1, NULL));

	$$ = list;

}