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 11:26:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Loop doing repeated quiescent-state forcing until the grace period ends.

函数原型：static void rcu_gp_fqs_loop(void)

返回类型：void

参数：无

1647  rnp等于Return the root node of the rcu_state structure.
1649  first_gp_fqs = true
1650  j等于READ_ONCE(jiffies_till_first_fqs)
1651  ret等于0
1652  循环
1653  如果非ret则
1654  Time at which to invoke 等于jiffies加j
1655  WRITE_ONCE(Time at which to kick , jiffies + (j ? 3 * j : 2))
1658  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.("fqswait"))
1661  GP kthread sleep state. 等于Wait for force-quiescent-state time.
1662  ret等于swait_event_idle_timeout_exclusive - wait up to timeout without load contribution*@wq: the waitqueue to wait on*@condition: a C expression for the event to wait for*@timeout: timeout at which we'll give up in jiffies* The process is put to sleep (Where GP task waits. , Helper function for swait_event_idle_exclusive() wakeup at force-quiescent-state* time., j)
1664  GP kthread sleep state. 等于Wait done for force-quiescent-state time.
1667  如果非READ_ONCE(CPUs or groups that need to switch in )且非rcu_preempt_blocked_readers_cgp(rnp)则退出
1671  如果ULONG_CMP_GE(jiffies, Time at which to invoke )或gf按位与Need grace-period quiescent-state forcing. 则
1673  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.("fqsstart"))
1676  Do one round of quiescent-state forcing.
1677  first_gp_fqs = false
1678  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.("fqsend"))
1681  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()()
1682  WRITE_ONCE(Time of last GP kthread , jiffies)
1683  ret等于0
1684  j等于READ_ONCE(jiffies_till_next_fqs)
1685  否则
1687  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()()
1688  WRITE_ONCE(Time of last GP kthread , jiffies)
1689  WARN_ON(signal_pending(当前进程))
1690  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.("fqswaitsig"))
1693  ret等于1
1694  j等于jiffies
1695  如果These inlines deal with timer wrapping correctly. You are * strongly encouraged to use them* 1. Because people otherwise forget* 2. Because if the timer wrap changes in future you won't have to* alter your driver code.(jiffies, Time at which to invoke )则j等于1
1697  否则j等于Time at which to invoke 减j
调用者
名称描述
rcu_gp_kthreadBody of kthread that handles grace periods.