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perf parse events: Demystify memory allocations

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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: David 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2013-07-02 13:27:25 -06:00 • committed by Arnaldo Carvalho de Melo
parent c549aca501
commit c5cd8ac07e
3 changed files with 61 additions and 63 deletions
Download patch file Download diff file Expand all files Collapse all files

52
tools/perf/util/parse-events.c
View file

@ -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)
{