Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [PATCH v4 06/16] perf tools: Support perf event alias name | Date | Tue, 8 Dec 2015 02:25:34 +0000 |
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From: He Kuang <hekuang@huawei.com>
This patch adds new bison rules for specifying an alias name to a perf event, which allows cmdline refer to previous defined perf event through its name. With this patch user can give alias name to a perf event using following cmdline:
# perf record -e mypmu=cycles ...
If alias is not provided (normal case):
# perf record -e cycles ...
It will be set to event's name automatically ('cycles' in the above example).
To allow parser refer to existing event selector, pass event list to 'struct parse_events_evlist'. perf_evlist__find_evsel_by_alias() is introduced to get evsel through its alias.
Test result:
Before this patch:
# ./perf record -e evt=cycles usleep 10 event syntax error: 'evt=cycles' \___ parser error Run 'perf list' for a list of valid events [SNIP]
After this patch:
# ./perf record -e evt=cycles usleep 10 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.012 MB perf.data (2 samples) ]
Signed-off-by: He Kuang <hekuang@huawei.com> Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com --- tools/perf/util/evlist.c | 16 ++++++++++++++++ tools/perf/util/evlist.h | 4 ++++ tools/perf/util/evsel.c | 1 + tools/perf/util/evsel.h | 1 + tools/perf/util/parse-events.c | 37 ++++++++++++++++++++++++++++++++----- tools/perf/util/parse-events.h | 5 +++++ tools/perf/util/parse-events.y | 15 ++++++++++++++- 7 files changed, 73 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index d1b6c20..a822823 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1737,3 +1737,19 @@ void perf_evlist__set_tracking_event(struct perf_evlist *evlist, tracking_evsel->tracking = true; } + +struct perf_evsel * +perf_evlist__find_evsel_by_alias(struct perf_evlist *evlist, + const char *alias) +{ + struct perf_evsel *evsel; + + evlist__for_each(evlist, evsel) { + if (!evsel->alias) + continue; + if (strcmp(alias, evsel->alias) == 0) + return evsel; + } + + return NULL; +} diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index a459fe7..4e25342 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -292,4 +292,8 @@ void perf_evlist__set_tracking_event(struct perf_evlist *evlist, struct perf_evsel *tracking_evsel); void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr); + +struct perf_evsel * +perf_evlist__find_evsel_by_alias(struct perf_evlist *evlist, const char *alias); + #endif /* __PERF_EVLIST_H */ diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 47f0330..8e0e6f4 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1073,6 +1073,7 @@ void perf_evsel__exit(struct perf_evsel *evsel) thread_map__put(evsel->threads); zfree(&evsel->group_name); zfree(&evsel->name); + zfree(&evsel->alias); perf_evsel__object.fini(evsel); } diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index 5ded1fc..5f6dd57 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -89,6 +89,7 @@ struct perf_evsel { int idx; u32 ids; char *name; + char *alias; double scale; const char *unit; struct event_format *tp_format; diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 95775fe..484c8e4 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -653,9 +653,9 @@ parse_events_config_bpf(struct parse_events_evlist *data, return -EINVAL; } - err = bpf__config_obj(obj, term, NULL, &error_pos); + err = bpf__config_obj(obj, term, data->evlist, &error_pos); if (err) { - bpf__strerror_config_obj(obj, term, NULL, + bpf__strerror_config_obj(obj, term, data->evlist, &error_pos, err, errbuf, sizeof(errbuf)); data->error->help = strdup( @@ -1089,6 +1089,30 @@ int parse_events__modifier_group(struct list_head *list, return parse_events__modifier_event(list, event_mod, true); } +int parse_events__set_event_alias(struct parse_events_evlist *data, + struct list_head *list, + const char *str, + void *loc_alias_) +{ + struct perf_evsel *evsel; + YYLTYPE *loc_alias = loc_alias_; + + if (!str) + return 0; + + if (!list_is_singular(list)) { + struct parse_events_error *err = data->error; + + err->idx = loc_alias->first_column; + err->str = strdup("One alias can be applied to one event only"); + return -EINVAL; + } + + evsel = list_first_entry(list, struct perf_evsel, node); + evsel->alias = strdup(str); + return evsel->alias ? 0 : -ENOMEM; +} + void parse_events__set_leader(char *name, struct list_head *list) { struct perf_evsel *leader; @@ -1281,6 +1305,8 @@ int parse_events_name(struct list_head *list, char *name) __evlist__for_each(list, evsel) { if (!evsel->name) evsel->name = strdup(name); + if (!evsel->alias) + evsel->alias = strdup(name); } return 0; @@ -1442,9 +1468,10 @@ int parse_events(struct perf_evlist *evlist, const char *str, struct parse_events_error *err) { struct parse_events_evlist data = { - .list = LIST_HEAD_INIT(data.list), - .idx = evlist->nr_entries, - .error = err, + .list = LIST_HEAD_INIT(data.list), + .idx = evlist->nr_entries, + .error = err, + .evlist = evlist, }; int ret; diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 84694f3..20ad3c2 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -98,6 +98,7 @@ struct parse_events_evlist { int idx; int nr_groups; struct parse_events_error *error; + struct perf_evlist *evlist; }; struct parse_events_terms { @@ -171,4 +172,8 @@ extern int is_valid_tracepoint(const char *event_string); int valid_event_mount(const char *eventfs); char *parse_events_formats_error_string(char *additional_terms); +int parse_events__set_event_alias(struct parse_events_evlist *data, + struct list_head *list, + const char *str, + void *loc_alias_); #endif /* __PERF_PARSE_EVENTS_H */ diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 8992d16..c3cbd7a 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -77,6 +77,7 @@ static inc_group_count(struct list_head *list, %type <head> event_bpf_file %type <head> event_def %type <head> event_mod +%type <head> event_alias %type <head> event_name %type <head> event %type <head> events @@ -193,13 +194,25 @@ event_name PE_MODIFIER_EVENT event_name event_name: -PE_EVENT_NAME event_def +PE_EVENT_NAME event_alias { ABORT_ON(parse_events_name($2, $1)); free($1); $$ = $2; } | +event_alias + +event_alias: +PE_NAME '=' event_def +{ + struct list_head *list = $3; + struct parse_events_evlist *data = _data; + + ABORT_ON(parse_events__set_event_alias(data, list, $1, &@1)); + $$ = list; +} +| event_def event_def: event_pmu | -- 1.8.3.4
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