From 18cd8c93e69e3853eb408980089fb3c58813f922 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Sat, 1 Jun 2019 05:12:36 -0700 Subject: [PATCH] rcu/nocb: Print gp/cb kthread hierarchy if dump_tree This commit causes the no-CBs grace-period/callback hierarchy to be printed to the console when the dump_tree kernel boot parameter is set. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree_plugin.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 80b27a9f306d..0a3f8680b450 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2135,6 +2135,7 @@ module_param(rcu_nocb_gp_stride, int, 0444); static void __init rcu_organize_nocb_kthreads(void) { int cpu; + bool firsttime = true; int ls = rcu_nocb_gp_stride; int nl = 0; /* Next GP kthread. */ struct rcu_data *rdp; @@ -2160,10 +2161,15 @@ static void __init rcu_organize_nocb_kthreads(void) nl = DIV_ROUND_UP(rdp->cpu + 1, ls) * ls; rdp->nocb_gp_rdp = rdp; rdp_gp = rdp; + if (!firsttime && dump_tree) + pr_cont("\n"); + firsttime = false; + pr_alert("%s: No-CB GP kthread CPU %d:", __func__, cpu); } else { /* Another CB kthread, link to previous GP kthread. */ rdp->nocb_gp_rdp = rdp_gp; rdp_prev->nocb_next_cb_rdp = rdp; + pr_alert(" %d", cpu); } rdp_prev = rdp; } -- 2.11.0