linux-kernel - [PATCH v4 11/14] lib: Move call_rcu() to call_rcu

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Date:   Fri, 19 Aug 2022 20:48:54 +0000
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        paulmck@...nel.org,
        Rushikesh S Kadam <rushikesh.s.kadam@...el.com>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Neeraj upadhyay <neeraj.iitr10@...il.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        rcu <rcu@...r.kernel.org>, vineeth@...byteword.org
Subject: [PATCH v4 11/14] lib: Move call_rcu() to call_rcu_lazy()

Move radix-tree and xarray to call_rcu_lazy(). This is required to
prevent callbacks triggering RCU machinery too quickly and too often,
which adds more power to the system.

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 lib/radix-tree.c | 2 +-
 lib/xarray.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index b3afafe46fff..1526dc9e1d93 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -305,7 +305,7 @@ void radix_tree_node_rcu_free(struct rcu_head *head)
 static inline void
 radix_tree_node_free(struct radix_tree_node *node)
 {
-	call_rcu(&node->rcu_head, radix_tree_node_rcu_free);
+	call_rcu_lazy(&node->rcu_head, radix_tree_node_rcu_free);
 }
 
 /*
diff --git a/lib/xarray.c b/lib/xarray.c
index ea9ce1f0b386..230abc8045fe 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -257,7 +257,7 @@ static void xa_node_free(struct xa_node *node)
 {
 	XA_NODE_BUG_ON(node, !list_empty(&node->private_list));
 	node->array = XA_RCU_FREE;
-	call_rcu(&node->rcu_head, radix_tree_node_rcu_free);
+	call_rcu_lazy(&node->rcu_head, radix_tree_node_rcu_free);
 }
 
 /*
-- 
2.37.2.609.g9ff673ca1a-goog