sched/isolation: Introduce housekeeping flags
Before we implement isolcpus under housekeeping, we need the isolation features to be more finegrained. For example some people want NOHZ_FULL without the full scheduler isolation, others want full scheduler isolation without NOHZ_FULL. So let's cut all these isolation features piecewise, at the risk of overcutting it right now. We can still merge some flags later if they always make sense together. 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/1509072159-31808-9-git-send-email-frederic@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -2270,8 +2270,8 @@ static int __init tile_net_init_module(void)
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tile_net_dev_init(name, mac);
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if (!network_cpus_init())
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cpumask_and(&network_cpus_map, housekeeping_cpumask(),
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cpu_online_mask);
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cpumask_and(&network_cpus_map,
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housekeeping_cpumask(HK_FLAG_MISC), cpu_online_mask);
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return 0;
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}
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@ -5,35 +5,43 @@
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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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};
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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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extern void housekeeping_affine(struct task_struct *t);
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extern bool housekeeping_test_cpu(int cpu);
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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(void)
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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(void)
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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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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)
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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);
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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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@ -2584,7 +2584,7 @@ static void rcu_bind_gp_kthread(void)
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if (!tick_nohz_full_enabled())
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return;
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housekeeping_affine(current);
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housekeeping_affine(current, HK_FLAG_RCU);
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}
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/* Record the current task on dyntick-idle entry. */
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@ -719,7 +719,7 @@ static int __noreturn rcu_tasks_kthread(void *arg)
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LIST_HEAD(rcu_tasks_holdouts);
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/* Run on housekeeping CPUs by default. Sysadm can move if desired. */
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housekeeping_affine(current);
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housekeeping_affine(current, HK_FLAG_RCU);
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/*
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* Each pass through the following loop makes one check for
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@ -527,7 +527,7 @@ int get_nohz_timer_target(void)
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int i, cpu = smp_processor_id();
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struct sched_domain *sd;
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if (!idle_cpu(cpu) && housekeeping_cpu(cpu))
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if (!idle_cpu(cpu) && housekeeping_cpu(cpu, HK_FLAG_TIMER))
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return cpu;
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rcu_read_lock();
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@ -536,15 +536,15 @@ int get_nohz_timer_target(void)
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if (cpu == i)
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continue;
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if (!idle_cpu(i) && housekeeping_cpu(i)) {
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if (!idle_cpu(i) && housekeeping_cpu(i, HK_FLAG_TIMER)) {
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cpu = i;
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goto unlock;
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}
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}
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}
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if (!housekeeping_cpu(cpu))
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cpu = housekeeping_any_cpu();
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if (!housekeeping_cpu(cpu, HK_FLAG_TIMER))
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cpu = housekeeping_any_cpu(HK_FLAG_TIMER);
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unlock:
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rcu_read_unlock();
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return cpu;
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@ -9027,7 +9027,7 @@ void nohz_balance_enter_idle(int cpu)
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return;
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/* Spare idle load balancing on CPUs that don't want to be disturbed: */
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if (!housekeeping_cpu(cpu))
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if (!housekeeping_cpu(cpu, HK_FLAG_SCHED))
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return;
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if (test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))
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@ -15,37 +15,39 @@
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DEFINE_STATIC_KEY_FALSE(housekeeping_overriden);
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EXPORT_SYMBOL_GPL(housekeeping_overriden);
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static cpumask_var_t housekeeping_mask;
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static unsigned int housekeeping_flags;
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int housekeeping_any_cpu(void)
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int housekeeping_any_cpu(enum hk_flags flags)
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{
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if (static_branch_unlikely(&housekeeping_overriden))
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if (housekeeping_flags & flags)
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return cpumask_any_and(housekeeping_mask, cpu_online_mask);
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return smp_processor_id();
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}
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EXPORT_SYMBOL_GPL(housekeeping_any_cpu);
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const struct cpumask *housekeeping_cpumask(void)
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const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
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{
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if (static_branch_unlikely(&housekeeping_overriden))
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if (housekeeping_flags & flags)
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return housekeeping_mask;
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return cpu_possible_mask;
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}
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EXPORT_SYMBOL_GPL(housekeeping_cpumask);
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void housekeeping_affine(struct task_struct *t)
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void housekeeping_affine(struct task_struct *t, enum hk_flags flags)
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{
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if (static_branch_unlikely(&housekeeping_overriden))
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if (housekeeping_flags & flags)
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set_cpus_allowed_ptr(t, housekeeping_mask);
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}
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EXPORT_SYMBOL_GPL(housekeeping_affine);
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bool housekeeping_test_cpu(int cpu)
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bool housekeeping_test_cpu(int cpu, enum hk_flags flags)
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{
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if (static_branch_unlikely(&housekeeping_overriden))
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if (housekeeping_flags & flags)
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return cpumask_test_cpu(cpu, housekeeping_mask);
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return true;
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}
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EXPORT_SYMBOL_GPL(housekeeping_test_cpu);
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@ -65,6 +67,8 @@ void __init housekeeping_init(void)
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cpumask_andnot(housekeeping_mask,
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cpu_possible_mask, tick_nohz_full_mask);
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housekeeping_flags = HK_FLAG_TIMER | HK_FLAG_RCU | HK_FLAG_MISC;
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static_branch_enable(&housekeeping_overriden);
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/* We need at least one CPU to handle housekeeping work */
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@ -777,7 +777,8 @@ void __init lockup_detector_init(void)
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if (tick_nohz_full_enabled())
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pr_info("Disabling watchdog on nohz_full cores by default\n");
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cpumask_copy(&watchdog_cpumask, housekeeping_cpumask());
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cpumask_copy(&watchdog_cpumask,
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housekeeping_cpumask(HK_FLAG_TIMER));
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if (!watchdog_nmi_probe())
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nmi_watchdog_available = true;
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