函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\rcu\tree.c Create Date:2022-07-27 11:27:21
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：_barrier - Wait until all in-flight call_rcu() callbacks complete

函数原型：void rcu_barrier(void)

返回类型：void

参数：无

2922  s等于_seq_snap - Take a snapshot of the update side's sequence number.* This function returns the earliest value of the grace-period sequence number* that will indicate that a full grace period has elapsed since the current* time
2924  Helper function for rcu_barrier() tracing. If tracing is disabled,* the compiler is expected to optimize this away.
2927  mutex_lock( & Guards barrier fields. )
2930  如果Given a snapshot from rcu_seq_snap(), determine whether or not a* full update-side operation has occurred.则
2931  Helper function for rcu_barrier() tracing. If tracing is disabled,* the compiler is expected to optimize this away.
2933  smp_mb()
2934  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
2935  返回
2939  Adjust sequence number for start of update-side operation.
2940  Helper function for rcu_barrier() tracing. If tracing is disabled,* the compiler is expected to optimize this away.
2948  init_completion( & Wake at barrier end. )
2949  atomic_set( & # CPUs waiting on. , 1)
2950  get_online_cpus()
2957  遍历可用CPU(cpu)
2958  rdp等于per_cpu_ptr( & rcu_data, cpu)
2959  如果非cpu_online(cpu)且非Is the specified rcu_segcblist offloaded? 则继续下一循环
2962  如果Return number of callbacks in segmented callback list. 则
2963  Helper function for rcu_barrier() tracing. If tracing is disabled,* the compiler is expected to optimize this away.
2965  smp_call_function_single(cpu, Called with preemption disabled, and from cross-cpu IRQ context., NULL, 1)
2966  否则
2967  Helper function for rcu_barrier() tracing. If tracing is disabled,* the compiler is expected to optimize this away.
2971  put_online_cpus()
2977  如果atomic_dec_and_test( & # CPUs waiting on. )则mplete: - signals a single thread waiting on this completion*@x: holds the state of this particular completion* This will wake up a single thread waiting on this completion. Threads will be* awakened in the same order in which they were queued.
2981  wait_for_completion: - waits for completion of a task*@x: holds the state of this particular completion* This waits to be signaled for completion of a specific task. It is NOT* interruptible and there is no timeout.* See also similar routines (i
2984  Helper function for rcu_barrier() tracing. If tracing is disabled,* the compiler is expected to optimize this away.
2985  Adjust sequence number for end of update-side operation.
2988  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
调用者
名称描述
flush_rcu_worklush_rcu_work - wait for a rwork to finish executing the last queueing*@rwork: the rcu work to flush* Return:* %true if flush_rcu_work() waited for the work to finish execution,* %false if it was already idle.
slab_caches_to_rcu_destroy_workfn
elv_unregister
rcu_sync_dtor_sync_dtor() - Clean up an rcu_sync structure*@rsp: Pointer to rcu_sync structure to be cleaned up
rcutorture_oom_notifyOOM notifier, but this only prints diagnostic information for the* current forward-progress test.