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authorAdrian Hunter <adrian.hunter@intel.com>2014-11-11 16:16:41 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-11-19 12:37:26 -0300
commita84808083688d82d7f1e5786ccf5df0ff7d448cb (patch)
tree681fb4c9ae7320ab1192f92e1c153ab35c90bf8e /tools/perf/util/thread.c
parent4b34f19b66ad29f10af90ad396131adbd16d737f (diff)
downloadop-kernel-dev-a84808083688d82d7f1e5786ccf5df0ff7d448cb.zip
op-kernel-dev-a84808083688d82d7f1e5786ccf5df0ff7d448cb.tar.gz
perf tools: Only override the default :tid comm entry
Events may still be ordered even if there are no timestamps e.g. if the data is recorded per-thread. Also synthesized COMM events have a timestamp of zero. Consequently it is better to keep comm entries even if they have a timestamp of zero. However, when a struct thread is created the command string is not known and a comm entry with a string of the form ":<tid>" is used. In that case thread->comm_set is false and the comm entry should be overridden. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1415715423-15563-4-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/thread.c')
-rw-r--r--tools/perf/util/thread.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index a2157f0..9ebc8b1 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -103,15 +103,14 @@ struct comm *thread__exec_comm(const struct thread *thread)
return last;
}
-/* CHECKME: time should always be 0 if event aren't ordered */
int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
bool exec)
{
struct comm *new, *curr = thread__comm(thread);
int err;
- /* Override latest entry if it had no specific time coverage */
- if (!curr->start && !curr->exec) {
+ /* Override the default :tid entry */
+ if (!thread->comm_set) {
err = comm__override(curr, str, timestamp, exec);
if (err)
return err;
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