linux-kernel - [PATCH 3/3] sched/fair: Kill task_change_group

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Date:   Tue, 21 Feb 2017 15:10:51 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>,
        <linux-kernel@...r.kernel.org>, <ktkhai@...tuozzo.com>
Subject: [PATCH 3/3] sched/fair: Kill task_change_group_fair()

Since we need the special behaviour for TASK_MOVE_GROUP case only,
we may move the switch up to sched_change_group() and kill
task_change_group_fair().
I suppose, this may simplify the code in some way.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 kernel/sched/core.c  |    4 ++--
 kernel/sched/fair.c  |   15 +--------------
 kernel/sched/sched.h |    2 +-
 3 files changed, 4 insertions(+), 17 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8f972df76eb2..5007892342b2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6395,8 +6395,8 @@ static void sched_change_group(struct task_struct *tsk, int type)
 	tsk->sched_task_group = tg;
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-	if (tsk->sched_class->task_change_group)
-		tsk->sched_class->task_change_group(tsk, type);
+	if (tsk->sched_class->task_move_group && type == TASK_MOVE_GROUP)
+		tsk->sched_class->task_move_group(tsk);
 	else
 #endif
 		set_task_rq(tsk, task_cpu(tsk));
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a005bee12e0b..cf6d12513a3f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9206,19 +9206,6 @@ static void task_move_group_fair(struct task_struct *p)
 	attach_task_cfs_rq(p);
 }
 
-static void task_change_group_fair(struct task_struct *p, int type)
-{
-	switch (type) {
-	case TASK_SET_GROUP:
-		set_task_rq(p, task_cpu(p));
-		break;
-
-	case TASK_MOVE_GROUP:
-		task_move_group_fair(p);
-		break;
-	}
-}
-
 void free_fair_sched_group(struct task_group *tg)
 {
 	int i;
@@ -9462,7 +9449,7 @@ const struct sched_class fair_sched_class = {
 	.update_curr		= update_curr_fair,
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-	.task_change_group	= task_change_group_fair,
+	.task_move_group	= task_move_group_fair,
 #endif
 };
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4a9313f0b5c8..f2bc04826ea5 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1407,7 +1407,7 @@ struct sched_class {
 #define TASK_MOVE_GROUP	1
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-	void (*task_change_group) (struct task_struct *p, int type);
+	void (*task_move_group) (struct task_struct *p);
 #endif
 };