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perf machine: Fix the value used for unknown pids

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The value used for unknown pids cannot be zero because that is used by
the "idle" task.

Use -1 instead.  Also handle the unknown pid case when creating map
groups.

Note that, threads with an unknown pid should not occur because fork (or
synthesized) events precede the thread's existence.

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/1405332185-4050-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2014-07-14 13:02:25 +03:00
committed by Arnaldo Carvalho de Melo
parent 57608cfd88
commit 1fcb876863
4 changed files with 13 additions and 12 deletions
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5
tools/perf/util/session.c
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@@ -1083,13 +1083,14 @@ void perf_event_header__bswap(struct perf_event_header *hdr)
struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
{
return machine__findnew_thread(&session->machines.host, 0, pid);
return machine__findnew_thread(&session->machines.host, -1, pid);
}
static struct thread *perf_session__register_idle_thread(struct perf_session *session)
{
struct thread *thread = perf_session__findnew(session, 0);
struct thread *thread;
thread = machine__findnew_thread(&session->machines.host, 0, 0);
if (thread == NULL || thread__set_comm(thread, "swapper", 0)) {
pr_err("problem inserting idle task.\n");
thread = NULL;