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authorPaul E. McKenney2022-03-18 08:08:14 -0700
committerPaul E. McKenney2022-04-11 17:06:43 -0700
commitbddf7122f7e321d5a677a695e8597064d987482c (patch)
treed028a0165370d12b2ae49a3a45c315e91c46b731 /kernel/rcu
parent777570d9ef820e470736fa9e02b8e3e48891c050 (diff)
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>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tasks.h10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 71fe340ab82a..405614039515 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -654,9 +654,13 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
// Slowly back off waiting for holdouts
set_tasks_gp_state(rtp, RTGS_WAIT_SCAN_HOLDOUTS);
- exp = jiffies_to_nsecs(fract);
- __set_current_state(TASK_IDLE);
- schedule_hrtimeout_range(&exp, jiffies_to_nsecs(HZ / 2), HRTIMER_MODE_REL_HARD);
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
+ schedule_timeout_idle(fract);
+ } else {
+ exp = jiffies_to_nsecs(fract);
+ __set_current_state(TASK_IDLE);
+ schedule_hrtimeout_range(&exp, jiffies_to_nsecs(HZ / 2), HRTIMER_MODE_REL_HARD);
+ }
if (fract < HZ)
fract++;