[PATCH 1/2] sched: Retain sleep/block information

[Arun Sharma]

This is so that we can compute the sleep/block
delay at context switch time for the purpose
of sleep profiling.

Signed-off-by: Arun Sharma <asharma@xxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxx>
Cc: Andrew Vagin <avagin@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 kernel/sched/fair.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index cd3b642..8ca98eb 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1003,7 +1003,6 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 		if (unlikely(delta > se->statistics.sleep_max))
 			se->statistics.sleep_max = delta;
 
-		se->statistics.sleep_start = 0;
 		se->statistics.sum_sleep_runtime += delta;
 
 		if (tsk) {
@@ -1020,7 +1019,6 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 		if (unlikely(delta > se->statistics.block_max))
 			se->statistics.block_max = delta;
 
-		se->statistics.block_start = 0;
 		se->statistics.sum_sleep_runtime += delta;
 
 		if (tsk) {
@@ -1193,8 +1191,12 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 
 			if (tsk->state & TASK_INTERRUPTIBLE)
 				se->statistics.sleep_start = rq_of(cfs_rq)->clock;
+			else
+				se->statistics.sleep_start = 0;
 			if (tsk->state & TASK_UNINTERRUPTIBLE)
 				se->statistics.block_start = rq_of(cfs_rq)->clock;
+			else
+				se->statistics.block_start = 0;
 		}
 #endif
 	}
-- 
1.7.4

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