[tip:perf/core] perf header: Prepare tracepoint events regardless of name

tip-bot for Namhyung Kim
2012-09-07T06:13:18Z

Commit-ID: 831394bdd9dd3ac1661336505c7cbdfd786d8cd4
Gitweb: http://git.kernel.org/tip/831394bdd9dd3ac1661336505c7cbdfd786d8cd4
Author: Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Thu, 6 Sep 2012 11:10:46 +0900
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 6 Sep 2012 10:51:02 -0300

perf header: Prepare tracepoint events regardless of name

Current perf_evlist__set_tracepoint_names is a misnomer because it finds
and sets correspoding event_format in addition to the name. So skipping
it when a event has set name already caused a trouble.

Rename it and set name only a event doesn't have one.

Reported-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1346897446-16569-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/header.c | 36 ++++++++++++++++++++++--------------
1 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 8b0b873..d07bc13 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2295,33 +2295,39 @@ static int read_attr(int fd, struct perf_header *ph,
return ret <= 0 ? -1 : 0;
}

-static int perf_evsel__set_tracepoint_name(struct perf_evsel *evsel,
- struct pevent *pevent)
+static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
+ struct pevent *pevent)
{
- struct event_format *event = pevent_find_event(pevent,
- evsel->attr.config);
+ struct event_format *event;
char bf[128];

+ /* already prepared */
+ if (evsel->tp_format)
+ return 0;
+
+ event = pevent_find_event(pevent, evsel->attr.config);
if (event == NULL)
return -1;

- snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
- evsel->name = strdup(bf);
- if (evsel->name == NULL)
- return -1;
+ if (!evsel->name) {
+ snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
+ evsel->name = strdup(bf);
+ if (evsel->name == NULL)
+ return -1;
+ }

evsel->tp_format = event;
return 0;
}

-static int perf_evlist__set_tracepoint_names(struct perf_evlist *evlist,
- struct pevent *pevent)
+static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
+ struct pevent *pevent)
{
struct perf_evsel *pos;

list_for_each_entry(pos, &evlist->entries, node) {
- if (pos->attr.type == PERF_TYPE_TRACEPOINT && !pos->name &&
- perf_evsel__set_tracepoint_name(pos, pevent))
+ if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
+ perf_evsel__prepare_tracepoint_event(pos, pevent))
return -1;
}

@@ -2409,7 +2415,8 @@ int perf_session__read_header(struct perf_session *session, int fd)

lseek(fd, header->data_offset, SEEK_SET);

- if (perf_evlist__set_tracepoint_names(session->evlist, session->pevent))
+ if (perf_evlist__prepare_tracepoint_events(session->evlist,
+ session->pevent))
goto out_delete_evlist;

header->frozen = 1;
@@ -2643,7 +2650,8 @@ int perf_event__process_tracing_data(union perf_event *event,
if (size_read + padding != size)
die("tracing data size mismatch");

- perf_evlist__set_tracepoint_names(session->evlist, session->pevent);
+ perf_evlist__prepare_tracepoint_events(session->evlist,
+ session->pevent);

return size_read + padding;
}