Previously, threads blocked on offlining CPUS are migrated to root
rcu_node, so there is a need to initiate RCU priority boosting on root
rcu_node,
Current RCU does not migrate blocked tasks even if all corresponding CPUs
offline.
commit d19fb8d1f3f6 ("rcu: Don't migrate blocked tasks even if all
corresponding CPUs offline")'
Consequently, rcu does not initiate RCU priority boosting on root rcu_node.
commit 1be0085b515e ("rcu: Don't initiate RCU priority boosting on root
rcu_node")'
So I think the comments for force_qs_rnp should be adjusted.
Signed-off-by: Zhouyi Zhou <zhouzho...@gmail.com>
---
kernel/rcu/tree.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index acd6ccf..efddffb 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2548,9 +2548,9 @@ void rcu_sched_clock_irq(int user)
}
/*
- * Scan the leaf rcu_node structures, processing dyntick state for any that
- * have not yet encountered a quiescent state, using the function specified.
- * Also initiate boosting for any threads blocked on the root rcu_node.
+ * Scan the leaf rcu_node structures, initiating boost for any threads blocked
+ * on them, processing dyntick state for any that have not yet encountered a
+ * quiescent state, using the function specified.
*
* The caller must have suppressed start of new grace periods.
*/
--
2.1.4
