perf tools: Save parent pid in thread struct

Information is available, so why not save it in case some command wants
to use it.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1369543631-5106-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 5 insertions, 0 deletions

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 632e40e5ceca..40399cbcca77 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -14,6 +14,7 @@ struct thread *thread__new(pid_t pid)
         if (self != NULL) {
                 map_groups__init(&self->mg);
                 self->pid = pid;
+                self->ppid = -1;
                 self->comm = malloc(32);
                 if (self->comm)
                         snprintf(self->comm, 32, ":%d", self->pid);
@@ -82,5 +83,8 @@ int thread__fork(struct thread *self, struct thread *parent)
         for (i = 0; i < MAP__NR_TYPES; ++i)
                 if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
                         return -ENOMEM;
+
+        self->ppid = parent->pid;
+
         return 0;
 }
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 5ad266403098..eeb7ac62b9e3 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -13,6 +13,7 @@ struct thread {
         };
         struct map_groups       mg;
         pid_t                   pid;
+        pid_t                   ppid;
         char                    shortname[3];
         bool                    comm_set;
         char                    *comm;