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| author | Paul E. McKenney <paulmck@kernel.org> | 2021-09-28 00:18:51 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-01 04:24:47 +0300 |
| commit | e2c73a6860bdf54f2c6bf8cddc34ddc91a1343e1 (patch) | |
| tree | d8b4e1ad9c9a7131bfe6fe50235e4d66465364cc /kernel/rcu/tree.h | |
| parent | 24eab6e1ff58d33048c36b5452f5d284c3710d02 (diff) | |
| download | linux-e2c73a6860bdf54f2c6bf8cddc34ddc91a1343e1.tar.xz | |
rcu: Remove the RCU_FAST_NO_HZ Kconfig option
All of the uses of CONFIG_RCU_FAST_NO_HZ=y that I have seen involve
systems with RCU callbacks offloaded. In this situation, all that this
Kconfig option does is slow down idle entry/exit with an additional
allways-taken early exit. If this is the only use case, then this
Kconfig option nothing but an attractive nuisance that needs to go away.
This commit therefore removes the RCU_FAST_NO_HZ Kconfig option.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 305cf6aeb408..7ca1aa46083c 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -189,11 +189,6 @@ struct rcu_data { bool rcu_urgent_qs; /* GP old need light quiescent state. */ bool rcu_forced_tick; /* Forced tick to provide QS. */ bool rcu_forced_tick_exp; /* ... provide QS to expedited GP. */ -#ifdef CONFIG_RCU_FAST_NO_HZ - unsigned long last_accelerate; /* Last jiffy CBs were accelerated. */ - unsigned long last_advance_all; /* Last jiffy CBs were all advanced. */ - int tick_nohz_enabled_snap; /* Previously seen value from sysfs. */ -#endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */ /* 4) rcu_barrier(), OOM callbacks, and expediting. */ struct rcu_head barrier_head; @@ -419,8 +414,6 @@ static bool rcu_is_callbacks_kthread(void); static void rcu_cpu_kthread_setup(unsigned int cpu); static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp); static void __init rcu_spawn_boost_kthreads(void); -static void rcu_cleanup_after_idle(void); -static void rcu_prepare_for_idle(void); static bool rcu_preempt_has_tasks(struct rcu_node *rnp); static bool rcu_preempt_need_deferred_qs(struct task_struct *t); static void rcu_preempt_deferred_qs(struct task_struct *t); |