perf machine: Fix the value used for unknown pids
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>
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index c38d06c..b7f555a 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -935,8 +935,8 @@
return -1;
}
- sched_out = machine__findnew_thread(machine, 0, prev_pid);
- sched_in = machine__findnew_thread(machine, 0, next_pid);
+ sched_out = machine__findnew_thread(machine, -1, prev_pid);
+ sched_in = machine__findnew_thread(machine, -1, next_pid);
out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
if (!out_events) {
@@ -979,7 +979,7 @@
{
const u32 pid = perf_evsel__intval(evsel, sample, "pid");
const u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
- struct thread *thread = machine__findnew_thread(machine, 0, pid);
+ struct thread *thread = machine__findnew_thread(machine, -1, pid);
struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
u64 timestamp = sample->time;
int cpu = sample->cpu;
@@ -1012,7 +1012,7 @@
struct thread *wakee;
u64 timestamp = sample->time;
- wakee = machine__findnew_thread(machine, 0, pid);
+ wakee = machine__findnew_thread(machine, -1, pid);
atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
if (!atoms) {
if (thread_atoms_insert(sched, wakee))
@@ -1072,7 +1072,7 @@
if (sched->profile_cpu == -1)
return 0;
- migrant = machine__findnew_thread(machine, 0, pid);
+ migrant = machine__findnew_thread(machine, -1, pid);
atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
if (!atoms) {
if (thread_atoms_insert(sched, migrant))
@@ -1290,7 +1290,7 @@
return -1;
}
- sched_in = machine__findnew_thread(machine, 0, next_pid);
+ sched_in = machine__findnew_thread(machine, -1, next_pid);
sched->curr_thread[this_cpu] = sched_in;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index e9b943a..5b80877 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -34,7 +34,7 @@
return -ENOMEM;
if (pid != HOST_KERNEL_ID) {
- struct thread *thread = machine__findnew_thread(machine, 0,
+ struct thread *thread = machine__findnew_thread(machine, -1,
pid);
char comm[64];
@@ -286,7 +286,7 @@
* the full rbtree:
*/
if (machine->last_match && machine->last_match->tid == tid) {
- if (pid && pid != machine->last_match->pid_)
+ if (pid != -1 && pid != machine->last_match->pid_)
machine->last_match->pid_ = pid;
return machine->last_match;
}
@@ -297,7 +297,7 @@
if (th->tid == tid) {
machine->last_match = th;
- if (pid && pid != th->pid_)
+ if (pid != -1 && pid != th->pid_)
th->pid_ = pid;
return th;
}
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 64a186e..c2f4ca9 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1083,13 +1083,14 @@
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;
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 2fde0d5..7a32f44 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -13,7 +13,7 @@
struct thread *leader;
pid_t pid = thread->pid_;
- if (pid == thread->tid) {
+ if (pid == thread->tid || pid == -1) {
thread->mg = map_groups__new();
} else {
leader = machine__findnew_thread(machine, pid, pid);