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From: Arnaldo Carvalho de Melo on 5 May 2010 10:40
From: Tom Zanussi <tzanussi(a)gmail.com>

Fix a couple of inefficiencies and redundancies related to
have_tracepoints() and its use when checking whether to write
TRACE_INFO.

First, there's no need to use get_tracepoints_path() in
have_tracepoints() - we really just want the part that checks whether
any attributes correspondo to tracepoints.

Second, we really don't care about raw_samples per se - tracepoints
are always raw_samples. In any case, the have_tracepoints() check
should be sufficient to decide whether or not to write TRACE_INFO.

Cc: Frederic Weisbecker <fweisbec(a)gmail.com>
Cc: Ingo Molnar <mingo(a)elte.hu>,
Cc: Mike Galbraith <efault(a)gmx.de>
Cc: Paul Mackerras <paulus(a)samba.org>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Acked-by: Frederic Weisbecker <fweisbec(a)gmail.com>
LKML-Reference: <1273030770.6383.6.camel(a)tropicana>
Signed-off-by: Tom Zanussi <tzanussi(a)gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com>
---
tools/perf/builtin-record.c | 11 +----------
tools/perf/util/trace-event-info.c | 8 +++++++-
2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0ff67d1..d3981ac 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -560,17 +560,8 @@ static int __cmd_record(int argc, const char **argv)
return err;
}

- if (raw_samples && have_tracepoints(attrs, nr_counters)) {
+ if (have_tracepoints(attrs, nr_counters))
perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
- } else {
- for (i = 0; i < nr_counters; i++) {
- if (attrs[i].sample_type & PERF_SAMPLE_RAW &&
- attrs[i].type == PERF_TYPE_TRACEPOINT) {
- perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
- break;
- }
- }
- }

atexit(atexit_header);

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 0a1fb9d..b157260 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -489,7 +489,13 @@ get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)

bool have_tracepoints(struct perf_event_attr *pattrs, int nb_events)
{
- return get_tracepoints_path(pattrs, nb_events) ? true : false;
+ int i;
+
+ for (i = 0; i < nb_events; i++)
+ if (pattrs[i].type == PERF_TYPE_TRACEPOINT)
+ return true;
+
+ return false;
}

int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
--
1.6.2.5

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Prev: [PATCH 3/4] perf list: Add explanation about raw hardware event descriptors
Next: KVM: SVM: Allow EFER.LMSLE to be set with nested svm