linux-kernel - [RFC PATCH 8/9] housekeeping: Move it under own config, independant from NO

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Date:   Fri, 21 Jul 2017 15:21:29 +0200
From:   Frederic Weisbecker <fweisbec@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <fweisbec@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        Christoph Lameter <cl@...ux.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>, Mike Galbraith <efault@....de>,
        Rik van Riel <riel@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>
Subject: [RFC PATCH 8/9] housekeeping: Move it under own config, independant from NO_HZ

Complete the housekeeping split from CONFIG_NO_HZ_FULL by moving it
under its own config. This way we finally separate the isolation code
from nohz.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Chris Metcalf <cmetcalf@...lanox.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Mike Galbraith <efault@....de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Wanpeng Li <kernellwp@...il.com>
Cc: Luiz Capitulino <lcapitulino@...hat.com>
---
 include/linux/housekeeping.h | 6 +++---
 init/Kconfig                 | 6 ++++++
 kernel/Makefile              | 2 +-
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/linux/housekeeping.h b/include/linux/housekeeping.h
index ba769c8..d79a665 100644
--- a/include/linux/housekeeping.h
+++ b/include/linux/housekeeping.h
@@ -5,7 +5,7 @@
 #include <linux/init.h>
 #include <linux/tick.h>
 
-#ifdef CONFIG_NO_HZ_FULL
+#ifdef CONFIG_HOUSEKEEPING
 DECLARE_STATIC_KEY_FALSE(housekeeping_overriden);
 extern int housekeeping_any_cpu(void);
 extern const struct cpumask *housekeeping_cpumask(void);
@@ -25,11 +25,11 @@ static inline const struct cpumask *housekeeping_cpumask(void)
 }
 
 static inline void housekeeping_affine(struct task_struct *t) { }
-#endif /* CONFIG_NO_HZ_FULL */
+#endif /* CONFIG_HOUSEKEEPING */
 
 static inline bool housekeeping_cpu(int cpu)
 {
-#ifdef CONFIG_NO_HZ_FULL
+#ifdef CONFIG_HOUSEKEEPING
 	if (static_branch_unlikely(&housekeeping_overriden))
 		return housekeeping_test_cpu(cpu);
 #endif
diff --git a/init/Kconfig b/init/Kconfig
index 8514b25..cc7af32 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -472,6 +472,12 @@ config TASK_IO_ACCOUNTING
 
 endmenu # "CPU/Task time and stats accounting"
 
+config HOUSEKEEPING
+	bool "Housekeeping work tuning"
+	help
+	  Allow to affine and offload kernel internal routine jobs that are
+	  usually executed on any CPU.
+
 source "kernel/rcu/Kconfig"
 
 config BUILD_BIN2C
diff --git a/kernel/Makefile b/kernel/Makefile
index 8a85c4b..58be459 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -109,7 +109,7 @@ obj-$(CONFIG_JUMP_LABEL) += jump_label.o
 obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
 obj-$(CONFIG_TORTURE_TEST) += torture.o
 obj-$(CONFIG_MEMBARRIER) += membarrier.o
-obj-$(CONFIG_NO_HZ_FULL) += housekeeping.o
+obj-$(CONFIG_HOUSEKEEPING) += housekeeping.o
 
 obj-$(CONFIG_HAS_IOMEM) += memremap.o
 
-- 
2.7.4