From: paulmck@kernel.org
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
mingo@kernel.org, jiangshanlai@gmail.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
Frederic Weisbecker <frederic@kernel.org>,
Neeraj Upadhyay <neeraju@codeaurora.org>,
Boqun Feng <boqun.feng@gmail.com>,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: [PATCH tip/core/rcu 12/12] rcu/nocb: Move trace_rcu_nocb_wake() calls outside nocb_lock when possible
Date: Wed, 3 Mar 2021 16:23:11 -0800 [thread overview]
Message-ID: <20210304002311.23655-12-paulmck@kernel.org> (raw)
In-Reply-To: <20210304002225.GA23492@paulmck-ThinkPad-P72>
From: Frederic Weisbecker <frederic@kernel.org>
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;
}
--
2.9.5
prev parent reply other threads:[~2021-03-04 1:09 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 0:22 [PATCH tip/core/rcu 0/12] NOCB updates for v5.13 Paul E. McKenney
2021-03-04 0:23 ` [PATCH tip/core/rcu 01/12] rcu/nocb: Detect unsafe checks for offloaded rdp paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 02/12] timer: Report ignored local enqueue in nohz mode paulmck
2021-03-04 11:58 ` Rafael J. Wysocki
2021-03-04 20:06 ` Paul E. McKenney
2021-03-04 0:23 ` [PATCH tip/core/rcu 03/12] rcu/nocb: Comment the reason behind BH disablement on batch processing paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 04/12] rcu/nocb: Forbid NOCB toggling on offline CPUs paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 05/12] rcu/nocb: Avoid confusing double write of rdp->nocb_cb_sleep paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 06/12] rcu/nocb: Only (re-)initialize segcblist when needed on CPU up paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 07/12] rcu/nocb: Rename nocb_gp_update_state to nocb_gp_update_state_deoffloading paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 08/12] rcu: Make nocb_nobypass_lim_per_jiffy static paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 09/12] rcu/nocb: Fix missed nocb_timer requeue paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 10/12] rcu/nocb: Disable bypass when CPU isn't completely offloaded paulmck
2021-03-04 0:23 ` [PATCH tip/core/rcu 11/12] rcu/nocb: Remove stale comment above rcu_segcblist_offload() paulmck
2021-03-04 0:23 ` paulmck [this message]
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