linux-toradex.git/include/trace/events/rcu.h, branch v4.19-rc5

rcu: Remove CPU-hotplug failsafe from force-quiescent-state code path

2018-07-12T22:39:07+00:00

Now that quiescent states for newly offlined CPUs are reported either
when that CPU goes offline or at the end of grace-period initialization,
the CPU-hotplug failsafe in the force-quiescent-state code path is no
longer needed.

This commit therefore removes this failsafe.

Signed-off-by: Paul E. McKenney

rcu: Rename the grace-period-request variables and parameters

2018-07-12T22:38:56+00:00

The name 'c' is used for variables and parameters holding the requested
grace-period sequence number.  However it is no longer very meaningful
given the conversions from ->gpnum and (especially) ->completed to
->gp_seq. This commit therefore renames 'c' to 'gp_seq_req'.

Previous patch discussion is at:
https://patchwork.kernel.org/patch/10396579/

Signed-off-by: Joel Fernandes 
Signed-off-by: Paul E. McKenney

rcu: Don't funnel-lock above leaf node if GP in progress

2018-07-12T22:38:52+00:00

The old grace-period start code would acquire only the leaf's rcu_node
structure's ->lock if that structure believed that a grace period was
in progress.  The new code advances to the leaf's parent in this case,
needlessly acquiring then leaf's parent's ->lock.  This commit therefore
checks the grace-period state after marking the leaf with the need for
the specified grace period, and if the leaf believes that a grace period
is in progress, takes an early exit.

Reported-by: Joel Fernandes 
Signed-off-by: Paul E. McKenney 
[ paulmck: Add "Startedleaf" tracing as suggested by Joel Fernandes. ]

rcu: Convert rcu_fqs tracepoint to ->gp_seq

2018-07-12T22:38:47+00:00

This commit makes the rcu_fqs tracepoint use ->gp_seq instead of ->gpnum.

Signed-off-by: Paul E. McKenney

rcu: Convert rcu_quiescent_state_report tracepoint to ->gp_seq

2018-07-12T22:38:47+00:00

This commit makes the rcu_quiescent_state_report tracepoint use ->gp_seq
instead of ->gpnum.

Signed-off-by: Paul E. McKenney

rcu: Convert rcu_unlock_preempted_task tracepoint to ->gp_seq

2018-07-12T22:38:46+00:00

This commit makes the rcu_unlock_preempted_task tracepoint use ->gp_seq
instead of ->gpnum.

Signed-off-by: Paul E. McKenney

rcu: Convert rcu_preempt_task tracepoint to ->gp_seq

2018-07-12T22:38:45+00:00

This commit makes the rcu_preempt_task tracepoint use ->gp_seq instead
of ->gpnum.

Signed-off-by: Paul E. McKenney

rcu: Convert rcu_grace_period_init tracepoint to gp_seq

2018-07-12T22:38:45+00:00

This commit makes the rcu_grace_period_init tracepoint use gp_seq instead
of ->gpnum.

Signed-off-by: Paul E. McKenney

rcu: Convert rcu_future_grace_period tracepoint to gp_seq

2018-07-12T22:38:44+00:00

This commit makes the rcu_future_grace_period tracepoint use gp_seq
instead of ->gpnum and ->completed.

Signed-off-by: Paul E. McKenney

rcu: Convert rcu_grace_period tracepoint to gp_seq

2018-07-12T22:38:43+00:00

This commit makes the rcu_grace_period tracepoint use gp_seq instead
of ->gpnum or ->completed.  It also introduces a "cpuofl-bgp" string to
less obscurely indicate when a CPU has gone offline while a grace period
is waiting on it.

Signed-off-by: Paul E. McKenney