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| author |   Neeraj Upadhyay <neeraju@codeaurora.org> | 2019-03-11 15:16:11 +0530 |
|---|---|---|
| committer |   Paul E. McKenney <paulmck@linux.ibm.com> | 2019-03-26 14:38:38 -0700 |
| commit | 6973032a602ee678c98644a30d57ebf9c72dd6d3 (patch) | |
| tree | 44820db287285618da734b39523757fdb9b0abb6 /kernel/rcu | |
| parent | rcu: Fix self-wakeups for grace-period kthread (diff) | |
| download | linux-dev-6973032a602ee678c98644a30d57ebf9c72dd6d3.tar.xz linux-dev-6973032a602ee678c98644a30d57ebf9c72dd6d3.zip | |
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')
| -rw-r--r-- | kernel/rcu/tree.c | 3 |
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 && |