[PATCH rcu 07/14] rcuscale: Print detailed grace-period and barrier diagnostics

[neeraj . upadhyay]

From: "Paul E. McKenney" <paul...@kernel.org>

This commit uses the new  rcu_tasks_torture_stats_print(),
rcu_tasks_trace_torture_stats_print(), and
rcu_tasks_rude_torture_stats_print() functions in order to provide
detailed diagnostics on grace-period, callback, and barrier state when
rcu_scale_writer() hangs.

[ paulmck: Apply kernel test robot feedback. ]

Signed-off-by: "Paul E. McKenney" <paul...@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadh...@kernel.org>
---
 kernel/rcu/rcuscale.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
index 1b9a43653d7e..c507750e94d8 100644
--- a/kernel/rcu/rcuscale.c
+++ b/kernel/rcu/rcuscale.c
@@ -298,6 +298,11 @@ static void tasks_scale_read_unlock(int idx)
 {
 }
 
+static void rcu_tasks_scale_stats(void)
+{
+       rcu_tasks_torture_stats_print(scale_type, SCALE_FLAG);
+}
+
 static struct rcu_scale_ops tasks_ops = {
        .ptype          = RCU_TASKS_FLAVOR,
        .init           = rcu_sync_scale_init,
@@ -310,6 +315,7 @@ static struct rcu_scale_ops tasks_ops = {
        .sync           = synchronize_rcu_tasks,
        .exp_sync       = synchronize_rcu_tasks,
        .rso_gp_kthread = get_rcu_tasks_gp_kthread,
+       .stats          = IS_ENABLED(CONFIG_TINY_RCU) ? NULL : 
rcu_tasks_scale_stats,
        .name           = "tasks"
 };
 
@@ -336,6 +342,11 @@ static void tasks_rude_scale_read_unlock(int idx)
 {
 }
 
+static void rcu_tasks_rude_scale_stats(void)
+{
+       rcu_tasks_rude_torture_stats_print(scale_type, SCALE_FLAG);
+}
+
 static struct rcu_scale_ops tasks_rude_ops = {
        .ptype          = RCU_TASKS_RUDE_FLAVOR,
        .init           = rcu_sync_scale_init,
@@ -346,6 +357,7 @@ static struct rcu_scale_ops tasks_rude_ops = {
        .sync           = synchronize_rcu_tasks_rude,
        .exp_sync       = synchronize_rcu_tasks_rude,
        .rso_gp_kthread = get_rcu_tasks_rude_gp_kthread,
+       .stats          = IS_ENABLED(CONFIG_TINY_RCU) ? NULL : 
rcu_tasks_rude_scale_stats,
        .name           = "tasks-rude"
 };
 
@@ -374,6 +386,11 @@ static void tasks_trace_scale_read_unlock(int idx)
        rcu_read_unlock_trace();
 }
 
+static void rcu_tasks_trace_scale_stats(void)
+{
+       rcu_tasks_trace_torture_stats_print(scale_type, SCALE_FLAG);
+}
+
 static struct rcu_scale_ops tasks_tracing_ops = {
        .ptype          = RCU_TASKS_FLAVOR,
        .init           = rcu_sync_scale_init,
@@ -386,6 +403,7 @@ static struct rcu_scale_ops tasks_tracing_ops = {
        .sync           = synchronize_rcu_tasks_trace,
        .exp_sync       = synchronize_rcu_tasks_trace,
        .rso_gp_kthread = get_rcu_tasks_trace_gp_kthread,
+       .stats          = IS_ENABLED(CONFIG_TINY_RCU) ? NULL : 
rcu_tasks_trace_scale_stats,
        .name           = "tasks-tracing"
 };
 
-- 
2.40.1