Commit 6973032a authored by Neeraj Upadhyay's avatar Neeraj Upadhyay Committed by Paul E. McKenney

rcu: Default jiffies_to_sched_qs to jiffies_till_sched_qs

The current code only calls adjust_jiffies_till_sched_qs() if
jiffies_till_sched_qs is left at its default value, so when the
jiffies_till_sched_qs kernel-boot parameter actually is specified,
jiffies_to_sched_qs will be left with the value zero, which
will result in useless slowdowns of cond_resched().  This commit
therefore changes rcu_init_geometry() to unconditionally invoke
adjust_jiffies_till_sched_qs(), which ensures that jiffies_to_sched_qs
will be initialized in all cases, thus maintaining good cond_resched()
performance.
Signed-off-by: default avatarNeeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.ibm.com>
parent 0f58d2ac
...@@ -3739,8 +3739,7 @@ static void __init rcu_init_geometry(void) ...@@ -3739,8 +3739,7 @@ static void __init rcu_init_geometry(void)
jiffies_till_first_fqs = d; jiffies_till_first_fqs = d;
if (jiffies_till_next_fqs == ULONG_MAX) if (jiffies_till_next_fqs == ULONG_MAX)
jiffies_till_next_fqs = d; jiffies_till_next_fqs = d;
if (jiffies_till_sched_qs == ULONG_MAX) adjust_jiffies_till_sched_qs();
adjust_jiffies_till_sched_qs();
/* If the compile-time values are accurate, just leave. */ /* If the compile-time values are accurate, just leave. */
if (rcu_fanout_leaf == RCU_FANOUT_LEAF && if (rcu_fanout_leaf == RCU_FANOUT_LEAF &&
......
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