From c5cd8ac07e7ad5f21b1930b23b2e1bb231958430 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Tue, 2 Jul 2013 13:27:25 -0600 Subject: [PATCH] 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: David Ahern Cc: Adrian Hunter Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1372793245-4136-7-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-events.c | 52 +++++++++------------------- tools/perf/util/parse-events.h | 10 +++--- tools/perf/util/parse-events.y | 62 ++++++++++++++++++++++------------ 3 files changed, 61 insertions(+), 63 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index bcf83ee97e92..e85376999efc 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -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) { diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 080f7cf25d99..f1cb4c4b3c70 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -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, diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index afc44c18dfe1..4eb67ec333f1 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -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; } -- 2.20.1