perf sched timehist: Save callchain when entering idle

In order to investigate the idleness reason, it is necessary to keep the
callchains when entering idle.  This can be identified by the
sched:sched_switch event having the next_pid field as 0.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161208144755.16673-4-namhyung@kernel.org
Link: http://lkml.kernel.org/r/20161213080632.19099-1-namhyung@kernel.org
[ Merged fix from Namhyung, see second Link: tag ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index e108b0f6a246..dc83b803ca54 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -200,6 +200,7 @@ struct perf_sched {
         /* options for timehist command */
         bool            summary;
         bool            summary_only;
+        bool            idle_hist;
         bool            show_callchain;
         unsigned int    max_stack;
         bool            show_cpu_visual;
@@ -2101,6 +2102,15 @@ static struct thread *get_idle_thread(int cpu)
         return idle_threads[cpu];
 }
 
+static void save_idle_callchain(struct idle_thread_runtime *itr,
+                                struct perf_sample *sample)
+{
+        if (!symbol_conf.use_callchain || sample->callchain == NULL)
+                return;
+
+        callchain_cursor__copy(&itr->cursor, &callchain_cursor);
+}
+
 /*
  * handle runtime stats saved per thread
  */
@@ -2154,6 +2164,26 @@ static struct thread *timehist_get_thread(struct perf_sched *sched,
                 }
 
                 save_task_callchain(sched, sample, evsel, machine);
+                if (sched->idle_hist) {
+                        struct thread *idle;
+                        struct idle_thread_runtime *itr;
+
+                        idle = get_idle_thread(sample->cpu);
+                        if (idle == NULL) {
+                                pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
+                                return NULL;
+                        }
+
+                        itr = thread__priv(idle);
+                        if (itr == NULL)
+                                return NULL;
+
+                        itr->last_thread = thread;
+
+                        /* copy task callchain when entering to idle */
+                        if (perf_evsel__intval(evsel, sample, "next_pid") == 0)
+                                save_idle_callchain(itr, sample);
+                }
         }
 
         return thread;