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authorNeeraj Upadhyay <neeraju@codeaurora.org>2019-03-11 12:46:11 +0300
committerPaul E. McKenney <paulmck@linux.ibm.com>2019-03-27 00:38:38 +0300
commit6973032a602ee678c98644a30d57ebf9c72dd6d3 (patch)
tree44820db287285618da734b39523757fdb9b0abb6 /kernel/rcu/tree.c
parent0f58d2ac2c87d27006c2b610668ebc4ff1f7c3ba (diff)
downloadlinux-6973032a602ee678c98644a30d57ebf9c72dd6d3.tar.xz
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: Neeraj Upadhyay <neeraju@codeaurora.org> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.c')
-rw-r--r--kernel/rcu/tree.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 139fa1f5c537..466299c3d2da 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3739,8 +3739,7 @@ static void __init rcu_init_geometry(void)
jiffies_till_first_fqs = d;
if (jiffies_till_next_fqs == ULONG_MAX)
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 (rcu_fanout_leaf == RCU_FANOUT_LEAF &&