linux-kernel - [RFC 22/60] cosched: Add config option for coscheduling support

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Date:   Fri,  7 Sep 2018 23:40:09 +0200
From:   Jan H. Schönherr <jschoenh@...zon.de>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jan H. Schönherr <jschoenh@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [RFC 22/60] cosched: Add config option for coscheduling support

Scheduled task groups will bring coscheduling to Linux.
The actual functionality will be added successively.

Signed-off-by: Jan H. Schönherr <jschoenh@...zon.de>
---
 init/Kconfig           | 11 +++++++++++
 kernel/sched/Makefile  |  1 +
 kernel/sched/cosched.c |  9 +++++++++
 3 files changed, 21 insertions(+)
 create mode 100644 kernel/sched/cosched.c

diff --git a/init/Kconfig b/init/Kconfig
index 1e234e2f1cba..78807f8f2cf7 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -762,6 +762,17 @@ config FAIR_GROUP_SCHED
 	depends on CGROUP_SCHED
 	default CGROUP_SCHED
 
+config COSCHEDULING
+	bool "Coscheduling extension for SCHED_OTHER (EXPERIMENTAL)"
+	depends on FAIR_GROUP_SCHED && SMP
+	default n
+	help
+	  This feature enables coscheduling for SCHED_OTHER. Unlike
+	  regular task groups the system aims to run members of
+	  scheduled task groups (STGs) simultaneously.
+
+	  Say N if unsure.
+
 config CFS_BANDWIDTH
 	bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
 	depends on FAIR_GROUP_SCHED
diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
index 7fe183404c38..f32781fe76c5 100644
--- a/kernel/sched/Makefile
+++ b/kernel/sched/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
 obj-$(CONFIG_MEMBARRIER) += membarrier.o
 obj-$(CONFIG_CPU_ISOLATION) += isolation.o
+obj-$(CONFIG_COSCHEDULING) += cosched.o
diff --git a/kernel/sched/cosched.c b/kernel/sched/cosched.c
new file mode 100644
index 000000000000..3bd4557ca5b7
--- /dev/null
+++ b/kernel/sched/cosched.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Coscheduling extension for CFS.
+ *
+ * Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * Author: Jan H. Schönherr <jschoenh@...zon.de>
+ */
+
+#include "sched.h"
-- 
2.9.3.1.gcba166c.dirty