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>
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@ -5,7 +5,7 @@
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#include <linux/init.h>
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#include <linux/tick.h>
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#ifdef CONFIG_NO_HZ_FULL
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#ifdef CONFIG_CPU_ISOLATION
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DECLARE_STATIC_KEY_FALSE(housekeeping_overriden);
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extern int housekeeping_any_cpu(void);
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extern const struct cpumask *housekeeping_cpumask(void);
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@ -27,11 +27,11 @@ static inline const struct cpumask *housekeeping_cpumask(void)
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static inline void housekeeping_affine(struct task_struct *t) { }
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static inline void housekeeping_init(void) { }
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#endif /* CONFIG_NO_HZ_FULL */
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#endif /* CONFIG_CPU_ISOLATION */
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static inline bool housekeeping_cpu(int cpu)
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{
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#ifdef CONFIG_NO_HZ_FULL
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#ifdef CONFIG_CPU_ISOLATION
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if (static_branch_unlikely(&housekeeping_overriden))
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return housekeeping_test_cpu(cpu);
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#endif
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@ -472,6 +472,14 @@ config TASK_IO_ACCOUNTING
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endmenu # "CPU/Task time and stats accounting"
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config CPU_ISOLATION
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bool "CPU isolation"
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depends on NO_HZ_FULL
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help
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Make sure that CPUs running critical tasks are not disturbed by
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any source of "noise" such as unbound workqueues, timers, kthreads...
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Unbound jobs get offloaded to housekeeping CPUs.
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source "kernel/rcu/Kconfig"
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config BUILD_BIN2C
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@ -26,4 +26,4 @@ obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
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obj-$(CONFIG_CPU_FREQ) += cpufreq.o
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obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
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obj-$(CONFIG_MEMBARRIER) += membarrier.o
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obj-$(CONFIG_NO_HZ_FULL) += isolation.o
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obj-$(CONFIG_CPU_ISOLATION) += isolation.o
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