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rcu/nocb: Print gp/cb kthread hierarchy if dump_tree

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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 <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-06-01 05:12:36 -07:00
parent f7c612b000
commit 18cd8c93e6
1 changed files with 6 additions and 0 deletions
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6
kernel/rcu/tree_plugin.h
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@ -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;
}