Signed-off-by: Lai Jiangshan <la...@cn.fujitsu.com>
---
kernel/rcutree.h | 1 +
kernel/rcutree_plugin.h | 1 +
kernel/rcutree_trace.c | 1 +
3 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 4a39d36..a5e9643 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -290,6 +290,7 @@ struct rcu_data {
unsigned long n_force_qs_snap;
/* did other CPU force QS recently? */
long blimit; /* Upper limit on a processed batch */
+ unsigned long n_defer_special;/* # of deferred _special() */
/* 3) dynticks interface. */
struct rcu_dynticks *dynticks; /* Shared per-CPU dynticks state. */
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index c9ff9f1..d828eec 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -396,6 +396,7 @@ void rcu_read_unlock_special(struct task_struct *t, bool
unlock)
* is still unlikey to be true.
*/
if (unlikely(unlock && irqs_disabled_flags(flags))) {
+ this_cpu_ptr(&rcu_preempt_data)->n_defer_special++;
set_need_resched();
local_irq_restore(flags);
return;
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index cf6c174..17d8b2c 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -149,6 +149,7 @@ static void print_one_rcu_data(struct seq_file *m, struct
rcu_data *rdp)
seq_printf(m, " ci=%lu nci=%lu co=%lu ca=%lu\n",
rdp->n_cbs_invoked, rdp->n_nocbs_invoked,
rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
+ seq_printf(m, " ds=%lu\n", rdp->n_defer_special);
}
static int show_rcudata(struct seq_file *m, void *v)
--
1.7.4.4
--
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