linux-kernel - [PATCH v1 2/5] kvfree_rcu: Switch to vfree_bulk() in kfree_rcu

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Date:   Wed, 28 Apr 2021 15:44:19 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: [PATCH v1 2/5] kvfree_rcu: Switch to vfree_bulk() in kfree_rcu_work()

Replace calling a vfree() in a loop per object by the
vfree_bulk() variant. In that case we just need to pass
an array of vmalloc'ed pointers and number of elements
in it.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 kernel/rcu/tree.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9ea1d4eef1ad..6bf170d01cd5 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3280,7 +3280,7 @@ static void kfree_rcu_work(struct work_struct *work)
 	struct rcu_head *head, *next;
 	struct kfree_rcu_cpu *krcp;
 	struct kfree_rcu_cpu_work *krwp;
-	int i, j;
+	int i;
 
 	krwp = container_of(to_rcu_work(work),
 			    struct kfree_rcu_cpu_work, rcu_work);
@@ -3313,13 +3313,7 @@ static void kfree_rcu_work(struct work_struct *work)
 				kfree_bulk(bkvhead[i]->nr_records,
 					bkvhead[i]->records);
 			} else { // vmalloc() / vfree().
-				for (j = 0; j < bkvhead[i]->nr_records; j++) {
-					trace_rcu_invoke_kvfree_callback(
-						rcu_state.name,
-						bkvhead[i]->records[j], 0);
-
-					vfree(bkvhead[i]->records[j]);
-				}
+				vfree_bulk(bkvhead[i]->nr_records, bkvhead[i]->records);
 			}
 			rcu_lock_release(&rcu_callback_map);
 
-- 
2.20.1