From: "tip-bot2 for Frederic Weisbecker" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Frederic Weisbecker <frederic@kernel.org>,
Josh Triplett <josh@joshtriplett.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
Neeraj Upadhyay <neeraju@codeaurora.org>,
Boqun Feng <boqun.feng@gmail.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: core/rcu] rcu/nocb: Move trace_rcu_nocb_wake() calls outside nocb_lock when possible
Date: Sun, 11 Apr 2021 13:43:25 -0000 [thread overview]
Message-ID: <161814860543.29796.3405977038161658800.tip-bot2@tip-bot2> (raw)
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: e02691b7ef51c5fac0eee5a6ebde45ce92958fae
Gitweb: https://git.kernel.org/tip/e02691b7ef51c5fac0eee5a6ebde45ce92958fae
Author: Frederic Weisbecker <frederic@kernel.org>
AuthorDate: Tue, 23 Feb 2021 01:10:02 +01:00
Committer: Paul E. McKenney <paulmck@kernel.org>
CommitterDate: Mon, 15 Mar 2021 13:54:55 -07:00
rcu/nocb: Move trace_rcu_nocb_wake() calls outside nocb_lock when possible
Those tracing calls don't need to be under ->nocb_lock. This commit
therefore moves them outside of that lock.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/tree_plugin.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index b08564b..9846c8a 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1703,9 +1703,9 @@ static bool wake_nocb_gp(struct rcu_data *rdp, bool force,
lockdep_assert_held(&rdp->nocb_lock);
if (!READ_ONCE(rdp_gp->nocb_gp_kthread)) {
+ rcu_nocb_unlock_irqrestore(rdp, flags);
trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
TPS("AlreadyAwake"));
- rcu_nocb_unlock_irqrestore(rdp, flags);
return false;
}
@@ -1955,9 +1955,9 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone,
// If we are being polled or there is no kthread, just leave.
t = READ_ONCE(rdp->nocb_gp_kthread);
if (rcu_nocb_poll || !t) {
+ rcu_nocb_unlock_irqrestore(rdp, flags);
trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
TPS("WakeNotPoll"));
- rcu_nocb_unlock_irqrestore(rdp, flags);
return;
}
// Need to actually to a wakeup.
@@ -1992,8 +1992,8 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone,
TPS("WakeOvfIsDeferred"));
rcu_nocb_unlock_irqrestore(rdp, flags);
} else {
- trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("WakeNot"));
rcu_nocb_unlock_irqrestore(rdp, flags);
+ trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("WakeNot"));
}
return;
}
reply other threads:[~2021-04-11 13:44 UTC|newest]
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