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perf evlist: Add can_select_event() method

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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>
This commit is contained in:
Adrian Hunter 2013-12-11 14:36:29 +02:00 committed by Arnaldo Carvalho de Melo
parent d645c442e6
commit c09ec62262
2 changed files with 39 additions and 0 deletions
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2
tools/perf/util/evlist.h
View file

@ -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 */

37
tools/perf/util/record.c
View file

@ -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;
}