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Message-Id: <20240828110929.3713-2-urezki@gmail.com>
Date: Wed, 28 Aug 2024 13:09:27 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: "Paul E . McKenney" <paulmck@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>
Cc: RCU <rcu@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Neeraj upadhyay <Neeraj.Upadhyay@....com>,
Boqun Feng <boqun.feng@...il.com>,
Joel Fernandes <joel@...lfernandes.org>,
Frederic Weisbecker <frederic@...nel.org>,
Uladzislau Rezki <urezki@...il.com>,
Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH 2/4] rcu/kvfree: Add a switcher for dynamic rcu_head
Add a sysfs attribute to control whether a dynamically
rcu_head should be attached or not. It can be controlled
via "/sys/module/rcutree/parameters/use_dyn_rcu_head".
By default it is OFF.
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
kernel/rcu/tree.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 0124411fecfb..893ee69d4a4b 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -206,6 +206,9 @@ module_param(rcu_min_cached_objs, int, 0444);
static int rcu_delay_page_cache_fill_msec = 5000;
module_param(rcu_delay_page_cache_fill_msec, int, 0444);
+static bool use_dyn_rcu_head __read_mostly;
+module_param(use_dyn_rcu_head, bool, 0444);
+
/* Retrieve RCU kthreads priority for rcutorture */
int rcu_get_gp_kthreads_prio(void)
{
@@ -3814,6 +3817,9 @@ attach_rcu_head_to_object(void *obj)
{
struct dyn_rcu_head *rhp;
+ if (!use_dyn_rcu_head)
+ return NULL;
+
rhp = kmalloc(sizeof(struct dyn_rcu_head), GFP_KERNEL |
__GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
--
2.39.2
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