Messages in this thread Patch in this message |  | | Date | Mon, 16 Dec 2013 07:27:05 -0800 | From | tip-bot for Adrian Hunter <> | Subject | [tip:perf/core] perf evlist: Add can_select_event() method |
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Commit-ID: c09ec622629eeb4b7877646a42852e7156363425 Gitweb: http://git.kernel.org/tip/c09ec622629eeb4b7877646a42852e7156363425 Author: Adrian Hunter <adrian.hunter@intel.com> AuthorDate: Wed, 11 Dec 2013 14:36:29 +0200 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Fri, 13 Dec 2013 10:30:20 -0300
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> --- tools/perf/util/evlist.h | 2 ++ tools/perf/util/record.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 649d6ea..8a04aae 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 c8845b1..e510453 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; +}
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