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rcu-tasks: Convert sleeps to idle priority

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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>
This commit is contained in:
Paul E. McKenney 2020-05-07 16:47:13 -07:00
parent 9ebcfadb06
commit ea6eed9f7d
1 changed files with 3 additions and 3 deletions
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6
kernel/rcu/tasks.h
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@ -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--;