rcu_gp_fqs_loop

Name:Loop doing repeated quiescent-state forcing until the grace period ends.

Proto:static void rcu_gp_fqs_loop(void)

Type:void

Parameter:Nothing

1647

rnp = Return the root node of the rcu_state structure.

1649

first_gp_fqs = true

1650

j = READ_ONCE(jiffies_till_first_fqs)

1651

ret = 0

1652

1653

If Not ret Then

1654

Time at which to invoke = jiffies + 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. = Wait for force-quiescent-state time.

1662

ret = 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. = Wait done for force-quiescent-state time.

1667

If Not READ_ONCE(CPUs or groups that need to switch in ) && Not rcu_preempt_blocked_readers_cgp(rnp) Then Break

1671

If ULONG_CMP_GE(jiffies, Time at which to invoke ) || gf & Need grace-period quiescent-state forcing. Then

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 = 0

1684

j = READ_ONCE(jiffies_till_next_fqs)

1685

Else

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(current process))

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 = 1

1694

1695

If 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 ) Then j = 1

1697

Else j = Time at which to invoke - j

**Caller**
Name	Describe
rcu_gp_kthread	Body of kthread that handles grace periods.

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