From: "Paul E. McKenney" <[email protected]> This is a experimental commit that attempts to better handle high-load situations.
Not-yet-signed-off-by: Paul E. McKenney <[email protected]> --- init/Kconfig | 1 - kernel/rcu/tree.c | 10 +++++++++- kernel/rcu/tree_plugin.h | 4 ---- 3 files changed, 9 insertions(+), 6 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 9afb971497f4..8787131d0f5c 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -669,7 +669,6 @@ config RCU_BOOST config RCU_KTHREAD_PRIO int "Real-time priority to use for RCU worker threads" range 1 99 - depends on RCU_BOOST default 1 help This option specifies the SCHED_FIFO priority value that will be diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 5987fdc85fc4..7a8d7e0d23f6 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -156,6 +156,10 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) static void invoke_rcu_core(void); static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp); +/* rcuc/rcub kthread realtime priority */ +static int kthread_prio = CONFIG_RCU_KTHREAD_PRIO; +module_param(kthread_prio, int, 0644); + /* * Track the rcutorture test sequence number and the update version * number within a given test. The rcutorture_testseq is incremented @@ -3599,15 +3603,19 @@ static int __init rcu_spawn_gp_kthread(void) unsigned long flags; struct rcu_node *rnp; struct rcu_state *rsp; + struct sched_param sp; struct task_struct *t; rcu_scheduler_fully_active = 1; for_each_rcu_flavor(rsp) { - t = kthread_run(rcu_gp_kthread, rsp, "%s", rsp->name); + t = kthread_create(rcu_gp_kthread, rsp, "%s", rsp->name); BUG_ON(IS_ERR(t)); rnp = rcu_get_root(rsp); raw_spin_lock_irqsave(&rnp->lock, flags); rsp->gp_kthread = t; + sp.sched_priority = kthread_prio; + sched_setscheduler_nocheck(t, SCHED_FIFO, &sp); + wake_up_process(t); raw_spin_unlock_irqrestore(&rnp->lock, flags); } rcu_spawn_nocb_kthreads(); diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 81ff8b9a5a39..dcb32638f88b 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -34,10 +34,6 @@ #include "../locking/rtmutex_common.h" -/* rcuc/rcub kthread realtime priority */ -static int kthread_prio = CONFIG_RCU_KTHREAD_PRIO; -module_param(kthread_prio, int, 0644); - /* * Control variables for per-CPU and per-rcu_node kthreads. These * handle all flavors of RCU. -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
