rcu: Update jiffies_to_sched_qs and adjust_jiffies_till_sched_qs() comments (85f2b60c) · Commits · 戴 / test

This commit better documents the jiffies_to_sched_qs default-value strategy used by adjust_jiffies_till_sched_qs() Reported-by:

kernel/rcu/tree.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -406,7 +406,7 @@ static bool rcu_kick_kthreads;
		*/
		static ulong jiffies_till_sched_qs = ULONG_MAX;
		module_param(jiffies_till_sched_qs, ulong, 0444);
		static ulong jiffies_to_sched_qs; /* Adjusted version of above if not default */
		static ulong jiffies_to_sched_qs; /* See adjust_jiffies_till_sched_qs(). */
		module_param(jiffies_to_sched_qs, ulong, 0444); /* Display only! */

		/*
		@@ -424,6 +424,7 @@ static void adjust_jiffies_till_sched_qs(void)
		WRITE_ONCE(jiffies_to_sched_qs, jiffies_till_sched_qs);
		return;
		}
		/* Otherwise, set to third fqs scan, but bound below on large system. */
		j = READ_ONCE(jiffies_till_first_fqs) +
		2 * READ_ONCE(jiffies_till_next_fqs);
		if (j < HZ / 10 + nr_cpu_ids / RCU_JIFFIES_FQS_DIV)