rcu-tasks: Convert sleeps to idle priority (ea6eed9f) · Commits · 戴 / test

This commit converts the long-standing schedule_timeout_interruptible() and schedule_timeout_uninterruptible() calls used by the various Tasks RCU's grace-period kthreads to schedule_timeout_idle(). This conversion avoids polluting the load-average with Tasks-RCU-related sleeping. Signed-off-by:

Paul E. McKenney <paulmck@kernel.org>

kernel/rcu/tasks.h

+3 −3

Original line number	Diff line number	Diff line
		@@ -205,7 +205,7 @@ static int __noreturn rcu_tasks_kthread(void *arg)
		if (!rtp->cbs_head) {
		WARN_ON(signal_pending(current));
		set_tasks_gp_state(rtp, RTGS_WAIT_WAIT_CBS);
		schedule_timeout_interruptible(HZ/10);
		schedule_timeout_idle(HZ/10);
		}
		continue;
		}
		@@ -227,7 +227,7 @@ static int __noreturn rcu_tasks_kthread(void *arg)
		cond_resched();
		}
		/* Paranoid sleep to keep this from entering a tight loop */
		schedule_timeout_uninterruptible(HZ/10);
		schedule_timeout_idle(HZ/10);

		set_tasks_gp_state(rtp, RTGS_WAIT_CBS);
		}
		@@ -336,7 +336,7 @@ 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);
		schedule_timeout_interruptible(HZ/fract);
		schedule_timeout_idle(HZ/fract);

		if (fract > 1)
		fract--;

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