[PATCH v11 5/7] sched: Consolidate pick_*_task to task_is_pushable helper

[John Stultz]

From: Connor O'Brien <connoro@xxxxxxxxxx>

This patch consolidates rt and deadline pick_*_task functions to
a task_is_pushable() helper

This patch was broken out from a larger chain migration
patch originally by Connor O'Brien.

Cc: Joel Fernandes <joelaf@xxxxxxxxxx>
Cc: Qais Yousef <qyousef@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Valentin Schneider <vschneid@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ben Segall <bsegall@xxxxxxxxxx>
Cc: Zimuzo Ezeozue <zezeozue@xxxxxxxxxx>
Cc: Youssef Esmat <youssefesmat@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Metin Kaya <Metin.Kaya@xxxxxxx>
Cc: Xuewen Yan <xuewen.yan94@xxxxxxxxx>
Cc: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: kernel-team@xxxxxxxxxxx
Signed-off-by: Connor O'Brien <connoro@xxxxxxxxxx>
[jstultz: split out from larger chain migration patch,
 renamed helper function]
Signed-off-by: John Stultz <jstultz@xxxxxxxxxx>
Tested-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Tested-by: Metin Kaya <metin.kaya@xxxxxxx>
Reviewed-by: Metin Kaya <metin.kaya@xxxxxxx>
Reviewed-by: Valentin Schneider <vschneid@xxxxxxxxxx>
---
v7:
* Split from chain migration patch
* Renamed function
v11:
* Switched to bool (though later in the series it goes
  to a tri-state return) for now to simplify review.
  Will add tri-state handling later in the series when
  its needed. Suggested by Metin and others.
---
 kernel/sched/deadline.c | 10 +---------
 kernel/sched/rt.c       | 11 +----------
 kernel/sched/sched.h    |  9 +++++++++
 3 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 3e05e239f5f6..ef135776e068 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2178,14 +2178,6 @@ static void task_fork_dl(struct task_struct *p)
 /* Only try algorithms three times */
 #define DL_MAX_TRIES 3
 
-static int pick_dl_task(struct rq *rq, struct task_struct *p, int cpu)
-{
-	if (!task_on_cpu(rq, p) &&
-	    cpumask_test_cpu(cpu, &p->cpus_mask))
-		return 1;
-	return 0;
-}
-
 /*
  * Return the earliest pushable rq's task, which is suitable to be executed
  * on the CPU, NULL otherwise:
@@ -2204,7 +2196,7 @@ static struct task_struct *pick_earliest_pushable_dl_task(struct rq *rq, int cpu
 	if (next_node) {
 		p = __node_2_pdl(next_node);
 
-		if (pick_dl_task(rq, p, cpu))
+		if (task_is_pushable(rq, p, cpu))
 			return p;
 
 		next_node = rb_next(next_node);
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 55bb33f367ad..56363e18949a 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1790,15 +1790,6 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 /* Only try algorithms three times */
 #define RT_MAX_TRIES 3
 
-static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
-{
-	if (!task_on_cpu(rq, p) &&
-	    cpumask_test_cpu(cpu, &p->cpus_mask))
-		return 1;
-
-	return 0;
-}
-
 /*
  * Return the highest pushable rq's task, which is suitable to be executed
  * on the CPU, NULL otherwise
@@ -1812,7 +1803,7 @@ static struct task_struct *pick_highest_pushable_task(struct rq *rq, int cpu)
 		return NULL;
 
 	plist_for_each_entry(p, head, pushable_tasks) {
-		if (pick_rt_task(rq, p, cpu))
+		if (task_is_pushable(rq, p, cpu))
 			return p;
 	}
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index a24286059a6a..493de4cc320a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -3490,6 +3490,15 @@ void move_queued_task_locked(struct rq *src_rq, struct rq *dst_rq, struct task_s
 	set_task_cpu(task, dst_rq->cpu);
 	activate_task(dst_rq, task, 0);
 }
+
+static inline
+bool task_is_pushable(struct rq *rq, struct task_struct *p, int cpu)
+{
+	if (!task_on_cpu(rq, p) &&
+	    cpumask_test_cpu(cpu, &p->cpus_mask))
+		return true;
+	return false;
+}
 #endif
 
 #endif /* _KERNEL_SCHED_SCHED_H */
-- 
2.45.2.993.g49e7a77208-goog