linux-kernel - [PATCH v6 1/6] rcu: Add data structures for synchronize

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Message-Id: <20240308173409.335345-2-urezki@gmail.com>
Date: Fri,  8 Mar 2024 18:34:04 +0100
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: "Paul E . McKenney" <paulmck@...nel.org>
Cc: RCU <rcu@...r.kernel.org>,
	Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Boqun Feng <boqun.feng@...il.com>,
	Hillf Danton <hdanton@...a.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
	Frederic Weisbecker <frederic@...nel.org>
Subject: [PATCH v6 1/6] rcu: Add data structures for synchronize_rcu()

The synchronize_rcu() call is going to be reworked, thus
this patch adds dedicated fields into the rcu_state structure.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 kernel/rcu/tree.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index df48160b3136..b942b9437438 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -315,6 +315,13 @@ do {									\
 	__set_current_state(TASK_RUNNING);				\
 } while (0)
 
+#define SR_NORMAL_GP_WAIT_HEAD_MAX 5
+
+struct sr_wait_node {
+	atomic_t inuse;
+	struct llist_node node;
+};
+
 /*
  * RCU global state, including node hierarchy.  This hierarchy is
  * represented in "heap" form in a dense array.  The root (first level)
@@ -400,6 +407,13 @@ struct rcu_state {
 						/* Synchronize offline with */
 						/*  GP pre-initialization. */
 	int nocb_is_setup;			/* nocb is setup from boot */
+
+	/* synchronize_rcu() part. */
+	struct llist_head srs_next;	/* request a GP users. */
+	struct llist_node *srs_wait_tail; /* wait for GP users. */
+	struct llist_node *srs_done_tail; /* ready for GP users. */
+	struct sr_wait_node srs_wait_nodes[SR_NORMAL_GP_WAIT_HEAD_MAX];
+	struct work_struct srs_cleanup_work;
 };
 
 /* Values for rcu_state structure's gp_flags field. */
-- 
2.39.2