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Commit c09ec622 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarAdrian 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent d645c442

tools/perf/util/evlist.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

tools/perf/util/record.c

+37 −0
Original line number Diff line number Diff line
@@ -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;

}