diff options
| author | Adrian Hunter | 2013-12-11 14:36:29 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo | 2013-12-13 10:30:20 -0300 |
| commit | c09ec622629eeb4b7877646a42852e7156363425 (patch) | |
| tree | 02c90a8cb6a9e74ef5367c9b183ad1591f18ab9d | |
| parent | d645c442e68d24e64c46845bc8bb5d5a0a70b249 (diff) | |
perf evlist: Add can_select_event() method
Add a function to determine whether an event can be selected.
This function is needed to allow a tool to automatically select
additional events, but only if they are available.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1386765443-26966-18-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/evlist.h | 2 | ||||
| -rw-r--r-- | tools/perf/util/record.c | 37 |
2 files changed, 39 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 649d6ea98a84..8a04aae95a18 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -193,4 +193,6 @@ static inline void perf_mmap__write_tail(struct perf_mmap *md, pc->data_tail = tail; } +bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str); + #endif /* __PERF_EVLIST_H */ diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c index c8845b107f60..e5104538c354 100644 --- a/tools/perf/util/record.c +++ b/tools/perf/util/record.c @@ -177,3 +177,40 @@ int perf_record_opts__config(struct perf_record_opts *opts) { return perf_record_opts__config_freq(opts); } + +bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str) +{ + struct perf_evlist *temp_evlist; + struct perf_evsel *evsel; + int err, fd, cpu; + bool ret = false; + + temp_evlist = perf_evlist__new(); + if (!temp_evlist) + return false; + + err = parse_events(temp_evlist, str); + if (err) + goto out_delete; + + evsel = perf_evlist__last(temp_evlist); + + if (!evlist || cpu_map__empty(evlist->cpus)) { + struct cpu_map *cpus = cpu_map__new(NULL); + + cpu = cpus ? cpus->map[0] : 0; + cpu_map__delete(cpus); + } else { + cpu = evlist->cpus->map[0]; + } + + fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0); + if (fd >= 0) { + close(fd); + ret = true; + } + +out_delete: + perf_evlist__delete(temp_evlist); + return ret; +} |