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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>
This commit is contained in:
Adrian Hunter 2014-11-11 16:16:41 +02:00 committed by Arnaldo Carvalho de Melo
parent 4b34f19b66
commit a848080836
1 changed files with 2 additions and 3 deletions
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5
tools/perf/util/thread.c
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@ -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;