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rcu-tasks: Use context-switch hook for PREEMPT=y kernels

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Currently, the PREEMPT=y version of rcu_note_context_switch() does not
invoke rcu_tasks_qs(), and we need it to in order to keep RCU Tasks
Trace's IPIs down to a dull roar.  This commit therefore enables this
hook.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-03-16 15:22:44 -07:00
parent ac3caf8274
commit 66777e5821
1 changed files with 2 additions and 0 deletions
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2
kernel/rcu/tree_plugin.h
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@ -331,6 +331,8 @@ void rcu_note_context_switch(bool preempt)
rcu_qs(); rcu_qs();
if (rdp->exp_deferred_qs) if (rdp->exp_deferred_qs)
rcu_report_exp_rdp(rdp); rcu_report_exp_rdp(rdp);
if (!preempt)
rcu_tasks_qs(current);
trace_rcu_utilization(TPS("End context switch")); trace_rcu_utilization(TPS("End context switch"));
} }
EXPORT_SYMBOL_GPL(rcu_note_context_switch); EXPORT_SYMBOL_GPL(rcu_note_context_switch);