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 11:26:42
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Body of kthread that handles grace periods.

函数原型：static int __noreturn rcu_gp_kthread(void *unused)

返回类型：int

参数：

类型参数名称
void *unused
1797  Bind the RCU grace-period kthreads to the housekeeping CPU.
1798  循环
1801  循环
1802  trace_rcu_grace_period(Name of structure. , READ_ONCE(Grace-period sequence #. ), Strings used in tracepoints need to be exported via the* tracing system such that tools like perf and trace-cmd can* translate the string address pointers to actual text.("reqwait"))
1805  GP kthread sleep state. 等于Wait for grace-period start.
1806  swait_event_idle_exclusive - wait without system load contribution*@wq: the waitqueue to wait on*@condition: a C expression for the event to wait for* The process is put to sleep (TASK_IDLE) until the @condition evaluates to* true(Where GP task waits. , READ_ONCE(Commands for GP task. ) & Need grace-period initialization. )
1809  GP kthread sleep state. 等于Wait done for grace-period start.
1811  如果Initialize a new grace period. Return false if no grace period required.则退出
1813  cond_resched_tasks_rcu_qs - Report potential quiescent states to RCU* This macro resembles cond_resched(), except that it is defined to* report potential quiescent states to RCU-tasks even if the cond_resched()()
1814  WRITE_ONCE(Time of last GP kthread , jiffies)
1815  WARN_ON(signal_pending(当前进程))
1816  trace_rcu_grace_period(Name of structure. , READ_ONCE(Grace-period sequence #. ), Strings used in tracepoints need to be exported via the* tracing system such that tools like perf and trace-cmd can* translate the string address pointers to actual text.("reqwaitsig"))
1822  Loop doing repeated quiescent-state forcing until the grace period ends.
1825  GP kthread sleep state. 等于Grace-period cleanup started.
1826  Clean up after the old grace period.
1827  GP kthread sleep state. 等于Grace-period cleanup complete.