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rcu: add support for dynamic ticks and preempt rcu

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The PREEMPT-RCU can get stuck if a CPU goes idle and NO_HZ is set. The
idle CPU will not progress the RCU through its grace period and a
synchronize_rcu my get stuck. Without this patch I have a box that will
not boot when PREEMPT_RCU and NO_HZ are set. That same box boots fine
with this patch.

This patch comes from the -rt kernel where it has been tested for
several months.

Signed-off-by: Steven Rostedt <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Steven Rostedt 2008-02-29 18:46:50 +01:00 • committed by Ingo Molnar
commit 2232c2d8e0
6 changed files with 259 additions and 4 deletions
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1
kernel/softirq.c
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@ -313,6 +313,7 @@ void irq_exit(void)
/* Make sure that timer wheel updates are propagated */
if (!in_interrupt() && idle_cpu(smp_processor_id()) && !need_resched())
tick_nohz_stop_sched_tick();
rcu_irq_exit();
#endif
preempt_enable_no_resched();
}