Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 27/27] rcu: Assign higher prio to RCU threads if rcutorture is built-in | Date | Mon, 25 Jun 2018 17:35:13 -0700 |
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From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
The rcutorture RCU priority boosting tests fail even with CONFIG_RCU_BOOST set because rcutorture's threads run at the same priority as the default RCU kthreads (RT class with priority of 1).
This patch checks if RCU torture is built into the kernel and if so, assigns RT priority 1 to the RCU threads, allowing the rcutorture boost tests to pass.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> --- kernel/rcu/tree.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index c59cca40ea92..988683089a4c 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3921,12 +3921,16 @@ static int __init rcu_spawn_gp_kthread(void) struct task_struct *t; /* Force priority into range. */ - if (IS_ENABLED(CONFIG_RCU_BOOST) && kthread_prio < 1) + if (IS_ENABLED(CONFIG_RCU_BOOST) && kthread_prio < 2 + && IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)) + kthread_prio = 2; + else if (IS_ENABLED(CONFIG_RCU_BOOST) && kthread_prio < 1) kthread_prio = 1; else if (kthread_prio < 0) kthread_prio = 0; else if (kthread_prio > 99) kthread_prio = 99; + if (kthread_prio != kthread_prio_in) pr_alert("rcu_spawn_gp_kthread(): Limited prio to %d from %d\n", kthread_prio, kthread_prio_in); -- 2.17.1
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