linux-kernel - [PATCH tip/core/rcu 04/12] rcu: Remove orphan/adopt event-tracing fields

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Date:   Mon, 24 Jul 2017 14:51:48 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 04/12] rcu: Remove orphan/adopt event-tracing fields

The rcu_node structure's ->n_cbs_orphaned and ->n_cbs_adopted fields
are updated, but never read.  This commit therefore removes them.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 2 --
 kernel/rcu/tree.h | 2 --
 2 files changed, 4 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f431114bc06a..f5acf34247fb 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3871,7 +3871,6 @@ rcu_send_cbs_to_orphanage(int cpu, struct rcu_state *rsp,
 	 * because _rcu_barrier() excludes CPU-hotplug operations, so it
 	 * cannot be running now.  Thus no memory barrier is required.
 	 */
-	rdp->n_cbs_orphaned += rcu_segcblist_n_cbs(&rdp->cblist);
 	rcu_segcblist_extract_count(&rdp->cblist, &rsp->orphan_done);
 
 	/*
@@ -3910,7 +3909,6 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp, unsigned long flags)
 		return;
 
 	/* Do the accounting first. */
-	rdp->n_cbs_adopted += rsp->orphan_done.len;
 	if (rsp->orphan_done.len_lazy != rsp->orphan_done.len)
 		rcu_idle_count_callbacks_posted();
 	rcu_segcblist_insert_count(&rdp->cblist, &rsp->orphan_done);
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 9af0f31d6847..aec53c4d4aec 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -219,8 +219,6 @@ struct rcu_data {
 					/* qlen at last check for QS forcing */
 	unsigned long	n_cbs_invoked;	/* count of RCU cbs invoked. */
 	unsigned long	n_nocbs_invoked; /* count of no-CBs RCU cbs invoked. */
-	unsigned long   n_cbs_orphaned; /* RCU cbs orphaned by dying CPU */
-	unsigned long   n_cbs_adopted;  /* RCU cbs adopted from dying CPU */
 	unsigned long	n_force_qs_snap;
 					/* did other CPU force QS recently? */
 	long		blimit;		/* Upper limit on a processed batch */
-- 
2.5.2