Messages in this thread Patch in this message | | | From | David Ahern <> | Subject | [PATCH 01/11] perf evlist: restore methods removed in earlier cleanup | Date | Thu, 11 Jul 2013 10:26:32 -0600 |
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e60fc847 removed the perf_evlist__add_tracepoints and helpers, but they are useful for kvm's upcoming live mode.
Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Ingo Molnar <mingo@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> --- tools/perf/util/evlist.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/evlist.h | 3 +++ 2 files changed, 57 insertions(+)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 42ea4e9..e666846 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -195,6 +195,60 @@ int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, return perf_evlist__add_attrs(evlist, attrs, nr_attrs); } +static int trace_event__id(const char *evname) +{ + char *filename, *colon; + int err = -1, fd; + + if (asprintf(&filename, "%s/%s/id", tracing_events_path, evname) < 0) + return -1; + + colon = strrchr(filename, ':'); + if (colon != NULL) + *colon = '/'; + + fd = open(filename, O_RDONLY); + if (fd >= 0) { + char id[16]; + if (read(fd, id, sizeof(id)) > 0) + err = atoi(id); + close(fd); + } + + free(filename); + return err; +} + +int perf_evlist__add_tracepoints(struct perf_evlist *evlist, + const char * const tracepoints[], + size_t nr_tracepoints) +{ + int err; + size_t i; + struct perf_event_attr *attrs = zalloc(nr_tracepoints * sizeof(*attrs)); + + if (attrs == NULL) + return -1; + + for (i = 0; i < nr_tracepoints; i++) { + err = trace_event__id(tracepoints[i]); + + if (err < 0) + goto out_free_attrs; + + attrs[i].type = PERF_TYPE_TRACEPOINT; + attrs[i].config = err; + attrs[i].sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | + PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD); + attrs[i].sample_period = 1; + } + + err = perf_evlist__add_attrs(evlist, attrs, nr_tracepoints); +out_free_attrs: + free(attrs); + return err; +} + struct perf_evsel * perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id) { diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 0583d36..a5b1880 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -59,6 +59,9 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry); int perf_evlist__add_default(struct perf_evlist *evlist); int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs); +int perf_evlist__add_tracepoints(struct perf_evlist *evlist, + const char * const tracepoints[], + size_t nr_tracepoints); #define perf_evlist__add_default_attrs(evlist, array) \ __perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array)) -- 1.7.10.1
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