lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240530134552.5467-3-frederic@kernel.org>
Date: Thu, 30 May 2024 15:45:43 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Neeraj Upadhyay <neeraj.upadhyay@....com>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	rcu <rcu@...r.kernel.org>
Subject: [PATCH 02/11] rcu/nocb: Move nocb field at the end of state struct

nocb_is_setup is a rarely used field, mostly on boot and CPU hotplug.
It shouldn't occupy the middle of the rcu state hot fields cacheline.

Move it to the end and build it conditionally while at it. More cold
NOCB fields are to come.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/rcu/tree.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index fcf2b4aa3441..a297dc89a09c 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -411,7 +411,6 @@ struct rcu_state {
 	arch_spinlock_t ofl_lock ____cacheline_internodealigned_in_smp;
 						/* 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. */
@@ -420,6 +419,10 @@ struct rcu_state {
 	struct sr_wait_node srs_wait_nodes[SR_NORMAL_GP_WAIT_HEAD_MAX];
 	struct work_struct srs_cleanup_work;
 	atomic_t srs_cleanups_pending; /* srs inflight worker cleanups. */
+
+#ifdef CONFIG_RCU_NOCB_CPU
+	int nocb_is_setup;			/* nocb is setup from boot */
+#endif
 };
 
 /* Values for rcu_state structure's gp_flags field. */
-- 
2.45.1


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ