From: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
To: "Paul E . McKenney" <paulmck@kernel.org>
Cc: RCU <rcu@vger.kernel.org>,
quic_neeraju@quicinc.com, Boqun Feng <boqun.feng@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
LKML <linux-kernel@vger.kernel.org>,
Uladzislau Rezki <urezki@gmail.com>,
Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>,
Frederic Weisbecker <frederic@kernel.org>
Subject: [PATCH 1/1] rcu/kvfree: Do not run a page work if a cache is disabled
Date: Tue, 11 Apr 2023 15:13:41 +0200 [thread overview]
Message-ID: <20230411131341.9910-1-urezki@gmail.com> (raw)
By default the cache size is 5 pages per-cpu. But it can
be disabled at boot time by setting the rcu_min_cached_objs
to zero.
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
kernel/rcu/tree.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 35be35f8236b..21e3d9dffde5 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3246,6 +3246,10 @@ static void fill_page_cache_func(struct work_struct *work)
static void
run_page_cache_worker(struct kfree_rcu_cpu *krcp)
{
+ // If cache disabled, bail out.
+ if (!rcu_min_cached_objs)
+ return;
+
if (rcu_scheduler_active == RCU_SCHEDULER_RUNNING &&
!atomic_xchg(&krcp->work_in_progress, 1)) {
if (atomic_read(&krcp->backoff_page_cache_fill)) {
--
2.30.2
next reply other threads:[~2023-04-11 13:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-11 13:13 Uladzislau Rezki (Sony) [this message]
2023-04-12 4:49 ` Paul E. McKenney
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