perf sched: Add involuntarily sleeping task in work atoms

Currently in perf sched, we are measuring the scheduler wakeup
latencies.

Now we also want measure the time a task wait to be scheduled
after it gets preempted.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 13 insertions, 6 deletions

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 7e57a986c056..61a80e8c9d0d 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -866,8 +866,8 @@ static struct trace_sched_handler replay_ops  = {
 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
 
 enum thread_state {
-        THREAD_SLEEPING,
-        THREAD_WAKED_UP,
+        THREAD_SLEEPING = 0,
+        THREAD_WAIT_CPU,
         THREAD_SCHED_IN,
         THREAD_IGNORE
 };
@@ -962,7 +962,9 @@ static char sched_out_state(struct trace_switch_event *switch_event)
 
 static void
 lat_sched_out(struct task_atoms *atoms,
-             struct trace_switch_event *switch_event __used, u64 delta)
+              struct trace_switch_event *switch_event __used,
+              u64 delta,
+              u64 timestamp)
 {
         struct work_atom *snapshot;
 
@@ -970,6 +972,11 @@ lat_sched_out(struct task_atoms *atoms,
         if (!snapshot)
                 die("Non memory");
 
+        if (sched_out_state(switch_event) == 'R') {
+                snapshot->state = THREAD_WAIT_CPU;
+                snapshot->wake_up_time = timestamp;
+        }
+
         snapshot->runtime = delta;
         list_add_tail(&snapshot->list, &atoms->snapshot_list);
 }
@@ -985,7 +992,7 @@ lat_sched_in(struct task_atoms *atoms, u64 timestamp)
         snapshot = list_entry(atoms->snapshot_list.prev, struct work_atom,
                               list);
 
-        if (snapshot->state != THREAD_WAKED_UP)
+        if (snapshot->state != THREAD_WAIT_CPU)
                 return;
 
         if (timestamp < snapshot->wake_up_time) {
@@ -1043,7 +1050,7 @@ latency_switch_event(struct trace_switch_event *switch_event,
         }
 
         lat_sched_in(in_atoms, timestamp);
-        lat_sched_out(out_atoms, switch_event, delta);
+        lat_sched_out(out_atoms, switch_event, delta, timestamp);
 }
 
 static void
@@ -1077,7 +1084,7 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
         if (snapshot->state != THREAD_SLEEPING)
                 return;
 
-        snapshot->state = THREAD_WAKED_UP;
+        snapshot->state = THREAD_WAIT_CPU;
         snapshot->wake_up_time = timestamp;
 }