The following commit has been merged into the core/rcu branch of tip: Commit-ID: 77865dea25c4f45ce0c5bf61a8470af01fccd944 Gitweb: https://git.kernel.org/tip/77865dea25c4f45ce0c5bf61a8470af01fccd944 Author: Paul E. McKenney <[email protected]> AuthorDate: Thu, 07 May 2020 15:44:46 -07:00 Committer: Paul E. McKenney <[email protected]> CommitterDate: Mon, 29 Jun 2020 11:58:49 -07:00
rcu: Grace-period-kthread related sleeps to idle priority This commit converts the long-standing schedule_timeout_interruptible() and schedule_timeout_uninterruptible() calls used by RCU's grace-period kthread to schedule_timeout_idle(). This conversion avoids polluting the load-average with RCU-related sleeping. Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/tree.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 874c831..feb31c2 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1638,7 +1638,7 @@ static void rcu_gp_slow(int delay) if (delay > 0 && !(rcu_seq_ctr(rcu_state.gp_seq) % (rcu_num_nodes * PER_RCU_NODE_PERIOD * delay))) - schedule_timeout_uninterruptible(delay); + schedule_timeout_idle(delay); } static unsigned long sleep_duration; @@ -1661,7 +1661,7 @@ static void rcu_gp_torture_wait(void) duration = xchg(&sleep_duration, 0UL); if (duration > 0) { pr_alert("%s: Waiting %lu jiffies\n", __func__, duration); - schedule_timeout_uninterruptible(duration); + schedule_timeout_idle(duration); pr_alert("%s: Wait complete\n", __func__); } } @@ -2727,7 +2727,7 @@ static void rcu_cpu_kthread(unsigned int cpu) } *statusp = RCU_KTHREAD_YIELDING; trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield")); - schedule_timeout_interruptible(2); + schedule_timeout_idle(2); trace_rcu_utilization(TPS("End CPU kthread@rcu_yield")); *statusp = RCU_KTHREAD_WAITING; }
