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rcu-tasks: Restore use of timers for non-RT kernels
The use of hrtimers for RCU-tasks grace-period delays works well in general, but can result in excessive grace-period delays for some corner-case workloads. This commit therefore reverts to the use of timers for non-RT kernels to mitigate those grace-period delays. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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1 changed files with 7 additions and 3 deletions
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@ -654,9 +654,13 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
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// Slowly back off waiting for holdouts
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set_tasks_gp_state(rtp, RTGS_WAIT_SCAN_HOLDOUTS);
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exp = jiffies_to_nsecs(fract);
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__set_current_state(TASK_IDLE);
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schedule_hrtimeout_range(&exp, jiffies_to_nsecs(HZ / 2), HRTIMER_MODE_REL_HARD);
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if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
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schedule_timeout_idle(fract);
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} else {
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exp = jiffies_to_nsecs(fract);
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__set_current_state(TASK_IDLE);
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schedule_hrtimeout_range(&exp, jiffies_to_nsecs(HZ / 2), HRTIMER_MODE_REL_HARD);
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}
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if (fract < HZ)
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fract++;
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