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sched/isolation: Split out new CONFIG_CPU_ISOLATION=y config from CONFIG_NO_HZ_FULL 

Split the housekeeping config from CONFIG_NO_HZ_FULL. This way we finally
separate the isolation code from NOHZ.

Although a dependency to CONFIG_NO_HZ_FULL remains for now, while the
housekeeping code still deals with NOHZ internals.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Link: http://lkml.kernel.org/r/1509072159-31808-8-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2017-10-27 04:42:34 +02:00 committed by Ingo Molnar
parent 204c083a00
commit 5c4991e24c
3 changed files with 12 additions and 4 deletions
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6
include/linux/sched/isolation.h
View File

@ -5,7 +5,7 @@
#include <linux/init.h>
#include <linux/tick.h>
#ifdef CONFIG_NO_HZ_FULL
#ifdef CONFIG_CPU_ISOLATION
DECLARE_STATIC_KEY_FALSE(housekeeping_overriden);
extern int housekeeping_any_cpu(void);
extern const struct cpumask *housekeeping_cpumask(void);
@ -27,11 +27,11 @@ static inline const struct cpumask *housekeeping_cpumask(void)
static inline void housekeeping_affine(struct task_struct *t) { }
static inline void housekeeping_init(void) { }
#endif /* CONFIG_NO_HZ_FULL */
#endif /* CONFIG_CPU_ISOLATION */
static inline bool housekeeping_cpu(int cpu)
{
#ifdef CONFIG_NO_HZ_FULL
#ifdef CONFIG_CPU_ISOLATION
if (static_branch_unlikely(&housekeeping_overriden))
return housekeeping_test_cpu(cpu);
#endif

8
init/Kconfig
View File

@ -472,6 +472,14 @@ config TASK_IO_ACCOUNTING
endmenu # "CPU/Task time and stats accounting"
config CPU_ISOLATION
bool "CPU isolation"
depends on NO_HZ_FULL
help
Make sure that CPUs running critical tasks are not disturbed by
any source of "noise" such as unbound workqueues, timers, kthreads...
Unbound jobs get offloaded to housekeeping CPUs.
source "kernel/rcu/Kconfig"
config BUILD_BIN2C

2
kernel/sched/Makefile
View File

@ -26,4 +26,4 @@ obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
obj-$(CONFIG_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
obj-$(CONFIG_MEMBARRIER) += membarrier.o
obj-$(CONFIG_NO_HZ_FULL) += isolation.o
obj-$(CONFIG_CPU_ISOLATION) += isolation.o