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1bda3f8087
As we prepare for offloading the residual 1hz scheduler ticks to workqueue, let's affine those to housekeepers so that they don't interrupt the CPUs that don't want to be disturbed. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> 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: Rik van Riel <riel@redhat.com> Cc: Wanpeng Li <kernellwp@gmail.com> Link: http://lkml.kernel.org/r/1519186649-3242-5-git-send-email-frederic@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#ifndef _LINUX_SCHED_ISOLATION_H
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#define _LINUX_SCHED_ISOLATION_H
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <linux/tick.h>
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enum hk_flags {
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HK_FLAG_TIMER = 1,
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HK_FLAG_RCU = (1 << 1),
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HK_FLAG_MISC = (1 << 2),
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HK_FLAG_SCHED = (1 << 3),
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HK_FLAG_TICK = (1 << 4),
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HK_FLAG_DOMAIN = (1 << 5),
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HK_FLAG_WQ = (1 << 6),
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};
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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(enum hk_flags flags);
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extern const struct cpumask *housekeeping_cpumask(enum hk_flags flags);
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extern void housekeeping_affine(struct task_struct *t, enum hk_flags flags);
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extern bool housekeeping_test_cpu(int cpu, enum hk_flags flags);
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extern void __init housekeeping_init(void);
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#else
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static inline int housekeeping_any_cpu(enum hk_flags flags)
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{
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return smp_processor_id();
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}
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static inline const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
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{
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return cpu_possible_mask;
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}
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static inline void housekeeping_affine(struct task_struct *t,
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enum hk_flags flags) { }
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static inline void housekeeping_init(void) { }
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#endif /* CONFIG_CPU_ISOLATION */
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static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
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{
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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, flags);
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#endif
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return true;
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}
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#endif /* _LINUX_SCHED_ISOLATION_H */
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