rcu/nocb: Rename rcu_nocb_leader_stride kernel boot parameter

This commit changes the name of the rcu_nocb_leader_stride kernel
boot parameter to rcu_nocb_gp_stride in order to account for the new
distinction between callback and grace-period no-CBs kthreads.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f3fcd61..79b983b 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3837,12 +3837,13 @@
                        RCU_BOOST is not set, valid values are 0-99 and
                        the default is zero (non-realtime operation).
 
-       rcutree.rcu_nocb_leader_stride= [KNL]
-                       Set the number of NOCB kthread groups, which
-                       defaults to the square root of the number of
-                       CPUs.  Larger numbers reduces the wakeup overhead
-                       on the per-CPU grace-period kthreads, but increases
-                       that same overhead on each group's leader.
+       rcutree.rcu_nocb_gp_stride= [KNL]
+                       Set the number of NOCB callback kthreads in
+                       each group, which defaults to the square root
+                       of the number of CPUs.  Larger numbers reduce
+                       the wakeup overhead on the global grace-period
+                       kthread, but increases that same overhead on
+                       each group's NOCB grace-period kthread.
 
        rcutree.qhimark= [KNL]
                        Set threshold of queued RCU callbacks beyond which

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index be065aa..80b27a9 100644 (file)
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2126,8 +2126,8 @@ static void __init rcu_spawn_nocb_kthreads(void)
 }
 
 /* How many CB CPU IDs per GP kthread?  Default of -1 for sqrt(nr_cpu_ids). */
-static int rcu_nocb_leader_stride = -1;
-module_param(rcu_nocb_leader_stride, int, 0444);
+static int rcu_nocb_gp_stride = -1;
+module_param(rcu_nocb_gp_stride, int, 0444);
 
 /*
  * Initialize GP-CB relationships for all no-CBs CPU.
@@ -2135,7 +2135,7 @@ module_param(rcu_nocb_leader_stride, int, 0444);
 static void __init rcu_organize_nocb_kthreads(void)
 {
        int cpu;
-       int ls = rcu_nocb_leader_stride;
+       int ls = rcu_nocb_gp_stride;
        int nl = 0;  /* Next GP kthread. */
        struct rcu_data *rdp;
        struct rcu_data *rdp_gp = NULL;  /* Suppress misguided gcc warn. */
@@ -2145,7 +2145,7 @@ static void __init rcu_organize_nocb_kthreads(void)
                return;
        if (ls == -1) {
                ls = int_sqrt(nr_cpu_ids);
-               rcu_nocb_leader_stride = ls;
+               rcu_nocb_gp_stride = ls;
        }
 
        /*