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| author |  Paul E. McKenney <paulmck@kernel.org>
| 2022-03-18 08:08:14 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org>
| 2022-04-11 17:06:43 -0700 |
| commit | bddf7122f7e321d5a677a695e8597064d987482c (patch) | |
| tree | d028a0165370d12b2ae49a3a45c315e91c46b731 /kernel/rcu/tasks.h | |
| parent | rcu-tasks: Use schedule_hrtimeout_range() to wait for grace periods (diff) | |
| download | linux-bddf7122f7e321d5a677a695e8597064d987482c.tar.gz linux-bddf7122f7e321d5a677a695e8597064d987482c.tar.bz2 linux-bddf7122f7e321d5a677a695e8597064d987482c.zip | |
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/tasks.h')
| -rw-r--r-- | kernel/rcu/tasks.h | 10 |
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++; |